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ICL3238CA

hot ICL3238CA

ICL3238CA

For Reference Only

Part Number ICL3238CA
Manufacturer Intersil
Description IC 5DRVR/3RCVR RS232 3V 28-SSOP
Datasheet ICL3238CA Datasheet
Package 28-SSOP (0.209", 5.30mm Width)
In Stock 350 piece(s)
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Lead Time Can Ship Immediately
Estimated Delivery Time Feb 28 - Mar 4 (Choose Expedited Shipping)
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ICL3238CA

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ICL3238CA Specifications

ManufacturerIntersil
CategoryIntegrated Circuits (ICs) - Interface - Drivers, Receivers, Transceivers
Datasheet ICL3238CA Datasheet
Package28-SSOP (0.209", 5.30mm Width)
Series-
TypeTransceiver
ProtocolRS232
Number of Drivers/Receivers5/3
DuplexFull
Receiver Hysteresis500mV
Data Rate1Mbps
Voltage - Supply3 V ~ 5.5 V
Operating Temperature0°C ~ 70°C
Mounting TypeSurface Mount
Package / Case28-SSOP (0.209", 5.30mm Width)
Supplier Device Package28-SSOP

ICL3238CA Datasheet

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FN4876 Rev 10.00 March 1, 2006 ICL3224, ICL3226, I CL3238, ICL3244 1 Microamp, +3V to +5.5V, 250kbps, RS-232 Transceivers with Enhanced Automatic Powerdown DATASHEETThe Intersil ICL32XX devices are 3.0V to 5.5V powered RS-232 transmitters/receivers which meet ElA/TIA-232 and V.28/V.24 specifications, even at VCC = 3.0V. Targeted applications are PDAs, Palmtops, and notebook and laptop computers where the low operational, and even lower standby, power consumption is critical. Efficient on-chip charge pumps, coupled with manual and enhanced automatic powerdown functions, reduce the standby supply current to a 1A trickle. Small footprint packaging, and the use of small, low value capacitors ensure board space savings as well. Data rates greater than 250kbps are guaranteed at worst case load conditions. This family is fully compatible with 3.3V only systems, mixed 3.3V and 5.0V systems, and 5.0V only systems. The ICL3244 is a 3 driver, 5 receiver device that provides a complete serial port suitable for laptop or notebook computers. The ICL3244/38 also include a noninverting always-active receiver for RING INDICATOR monitoring. These devices feature an enhanced automatic powerdown function which powers down the on-chip power- supply and driver circuits. This occurs when all receiver and transmitter inputs detect no signal transitions for a period of 30sec. These devices power back up, automatically, whenever they sense a transition on any transmitter or receiver input. Table 1 summarizes the features of the devices represented by this data sheet, while Application Note AN9863 summarizes the features of each device comprising the ICL32XX 3V family. Features • Pb-Free Plus Anneal Available (RoHS Compliant) • 15kV ESD Protected (Human Body Model) • Manual and Enhanced Automatic Powerdown Features • Drop in Replacements for MAX3224, MAX3226, MAX3238, MAX3244 • Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V • Latch-Up Free • RS-232 Compatible with VCC = 2.7V • On-Chip Voltage Converters Require Only Four External 0.1F Capacitors • Flow-Through Pinout (ICL3238) • Guaranteed Mouse Driveability (ICL3244) • “Ready to Transmit” Indicator Output (ICL3224/26) • Receiver Hysteresis For Improved Noise Immunity • Guaranteed Minimum Data Rate . . . . . . . . . . . . . 250kbps • Guaranteed Minimum Slew Rate . . . . . . . . . . . . . . . 6V/s • Wide Power Supply Range . . . . . . . Single +3V to +5.5V • Low Supply Current in Powerdown State. . . . . . . . . . .1A Applications • Any System Requiring RS-232 Communication Ports - Battery Powered, Hand-Held, and Portable Equipment - Laptop Computers, Notebooks, Palmtops - Modems, Printers and other Peripherals - Digital Cameras - Cellular/Mobile Phones - Data Cradles Related Literature • Technical Brief TB363 “Guidelines for Handling and Processing Moisture Sensitive Surface Mount Devices (SMDs)” • AN9863, “3V to +5.5V, 250k-1Mbps, RS-232 Transmitters/Receivers” TABLE 1. SUMMARY OF FEATURES PART NUMBER NO. OF Tx. NO. OF Rx. NO. OF MONITOR Rx. (ROUTB) DATA RATE (kbps) Rx. ENABLE FUNCTION? READY OUTPUT? MANUAL POWER- DOWN? ENHANCED AUTOMATIC POWERDOWN ICL3224 2 2 0 250 NO YES YES YES ICL3226 1 1 0 250 NO YES YES YES ICL3238 5 3 1 250 NO NO YES YES ICL3244 3 5 1 250 NO NO YES YESFN4876 Rev 10.00 Page 1 of 18 March 1, 2006

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ICL3224, ICL3226, I CL3238, ICL3244 Ordering Information PART NUMBER* PART MARKING TEMP. RANGE (°C) PACKAGE PKG. DWG. # ICL3224CA ICL3224CA 0 to 70 20 Ld SSOP M20.209 ICL3224CAZ (Note) 3224CAZ 0 to 70 20 Ld SSOP (Pb-free) M20.209 ICL3224IA ICL3224IA -40 to 85 20 Ld SSOP M20.209 ICL3224IAZ (Note) 3224IAZ -40 to 85 20 Ld SSOP (Pb-free) M20.209 ICL3226CA ICL3226CA 0 to 70 16 Ld SSOP M16.209 ICL3226CAZ (Note) ICL3226CAZ 0 to 70 16 Ld SSOP (Pb-free) M16.209 ICL3226IA ICL3226IA -40 to 85 16 Ld SSOP M16.209 ICL3226IAZ (Note) ICL3226IAZ -40 to 85 16 Ld SSOP (Pb-free) M16.209 ICL3238CA ICL3238CA 0 to 70 28 Ld SSOP M28.209 ICL3238CAZ (Note) ICL3238CAZ 0 to 70 28 Ld SSOP (Pb-free) M28.209 ICL3238IA ICL3238IA -40 to 85 28 Ld SSOP M28.209 ICL3238IAZ (Note) ICL3238IAZ -40 to 85 28 Ld SSOP (Pb-free) M28.209 ICL3244CA ICL3244CA 0 to 70 28 Ld SSOP M28.209 ICL3244IA ICL3244IA -40 to 85 28 Ld SSOP M28.209 *Most surface mount devices are available on tape and reel; add “-T” to suffix. NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. Ordering Information (Continued) PART NUMBER* PART MARKING TEMP. RANGE (°C) PACKAGE PKG. DWG. # Pinouts ICL3224 (SSOP) TOP VIEW ICL3226 (SSOP) TOP VIEW READY C1+ V+ C1- C2+ C2- V- T2OUT R2IN FORCEOFF GND T1OUT R1IN R1OUT T1IN INVALID VCC FORCEON T2IN 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10R2OUT READY C1+ V+ C1- C2+ C2- V- R1IN FORCEOFF GND T1OUT FORCEON T1IN R1OUT VCC INVALID 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 FN4876 Rev 10.00 Page 2 of 18 March 1, 2006

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ICL3224, ICL3226, I CL3238, ICL3244ICL3238 (SSOP) TOP VIEW ICL3244 (SSOP) TOP VIEW Pinouts (Continued) C2+ C2- V- R1IN R2IN R3IN R4IN R5IN T1OUT T3OUT T3IN T2IN T1IN C1+ VCC GND C1- FORCEON INVALID R1OUT R2OUT R3OUT R4OUT R5OUT V+ FORCEOFF R2OUTB 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 T2OUT C2+ GND C2- V- T1OUT T2OUT T3OUT R1IN R2IN R3IN T5OUT FORCEON FORCEOFF C1+ VCC C1- T1IN T2IN R1OUT T4IN R3OUT T5IN R1OUTB INVALID V+ T3IN R2OUT 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 T4OUTFN4876 Rev 10.00 Page 3 of 18 March 1, 2006

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ICL3224, ICL3226, I CL3238, ICL3244Pin Descriptions PIN FUNCTION VCC System power supply input (3.0V to 5.5V). V+ Internally generated positive transmitter supply (+5.5V). V- Internally generated negative transmitter supply (-5.5V). GND Ground connection. C1+ External capacitor (voltage doubler) is connected to this lead. C1- External capacitor (voltage doubler) is connected to this lead. C2+ External capacitor (voltage inverter) is connected to this lead. C2- External capacitor (voltage inverter) is connected to this lead. TIN TTL/CMOS compatible transmitter Inputs. TOUT RS-232 level (nominally 5.5V) transmitter outputs. RIN RS-232 compatible receiver inputs. ROUT TTL/CMOS level receiver outputs. ROUTB TTL/CMOS level, noninverting, always enabled receiver outputs. INVALID Active low output that indicates if no valid RS-232 levels are present on any receiver input. READY Active high output that indicates when the ICL32XX is ready to transmit (i.e., V-  -4V) FORCEOFF Active low to shut down transmitters and on-chip power supply. This overrides any automatic circuitry and FORCEON (see Table 2). FORCEON Active high input to override automatic powerdown circuitry thereby keeping transmitters active. (FORCEOFF must be high). Typical Operating Circuits ICL3224 ICL3226 19 VCC T1OUT T2OUT T1IN T2IN T1 T2 0.1F +0.1F + 0.1F 13 12 17 8 2 4 3 7 V+ V- C1+ C1- C2+ C2- +0.1F 5 6 R1OUT R1IN 16 5k R2OUT R2IN 910 5k 15 C1 C2 +C3 C4 READY 1 GND +3.3V + 0.1F 18 TTL/CMOS LOGIC RS-232 LEVELS R1 R2 FORCEON FORCEOFF 14 20 VCC 11 INVALID TO POWER CONTROL LEVELS LOGIC 15 VCC T1OUT T1IN T1 0.1F +0.1F + 0.1F 11 13 2 4 3 7 V+ V- C1+ C1- C2+ C2- +0.1F 5 6 R1OUT R1INR1 89 5k C1 C2 + C3 C4 READY 1 GND +3.3V + 0.1F 14 TTL/CMOS LOGIC RS-232 LEVELS FORCEON FORCEOFF 12 16 VCC 10 INVALID TO POWER CONTROL LOGIC LEVELSFN4876 Rev 10.00 Page 4 of 18 March 1, 2006

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ICL3224, ICL3226, I CL3238, ICL3244ICL3238 NOTES: 1. THE NEGATIVE TERMINAL OF C3 CAN BE CONNECTED TO EITHER VCC OR GND. 2. FOR VCC = 3.15V (3.3V -5%), USE C1 - C4 = 0.1F OR GREATER. FOR VCC = 3.0V (3.3V -10%), USE C1 - C4 = 0.22F. ICL3244 Typical Operating Circuits (Continued) 26 VCC T1OUT T2OUT T3OUT T1IN T2IN T3IN T1 T2 T3 0.1F + 0.1F + 0.1F 24 23 5 6 22 7 28 25 27 4 V+ V- C1+ C1- C2+ C2- +0.1F 1 3 R1OUT R1IN 8 5k R2OUT R2IN 920 5k R3OUT R3IN 1118 5k 21 R1OUTB C1 C2 + C3 C4 FORCEON FORCEOFF 13 GND 14 +3.3V + 0.1F 16 2 VCC TTL/CMOS LOGIC RS-232 LEVELS RS-232 LEVELS R1 R2 R3 15 INVALID TO POWER CONTROL + C3 (OPTIONAL T4OUT T5OUT T4IN T5IN T3 T4 19 10 17 12 LEVELS LOGIC CONNECTION, NOTE 2) NOTE 3 NOTE 3 26 VCC T1OUT T2OUT T3OUT T1IN T2IN T3IN T1 T2 T3 0.1F + 0.1F + 0.1F 14 13 9 10 12 11 28 24 27 3 V+ V- C1+ C1- C2+ C2- +0.1F 1 2 R1OUT R1IN 4 5k R2OUT R2IN 518 5k R3OUT R3IN 617 5k R4OUT R4IN 716 5k R5OUT R5INR5 815 5k 19 R2OUTB C1 C2 + C3 C4 FORCEON FORCEOFF 23 GND 22 +3.3V + 0.1F 20 25 VCC TTL/CMOS LOGIC RS-232 LEVELS RS-232 LEVELS R1 R2 R3 R4 21 INVALID TO POWER CONTROL LOGIC LEVELSFN4876 Rev 10.00 Page 5 of 18 March 1, 2006

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ICL3224, ICL3226, I CL3238, ICL3244Absolute Maximum Ratings Thermal Information VCC to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6V V+ to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V V- to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3V to -7V V+ to V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14V Input Voltages TIN, FORCEOFF, FORCEON . . . . . . . . . . . . . . . . . . -0.3V to 6V RIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25V Output Voltages TOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.2V ROUT, INVALID, READY . . . . . . . . . . . . . . . . -0.3V to VCC +0.3V Short Circuit Duration TOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . See Specification Table Thermal Resistance (Typical, Note 4) JA (°C/W) 16 Ld SSOP Package . . . . . . . . . . . . . . . . . . . . . . . 140 20 Ld SSOP Package . . . . . . . . . . . . . . . . . . . . . . . 125 28 Ld SSOP Package . . . . . . . . . . . . . . . . . . . . . . . 100 Maximum Junction Temperature (Plastic Package) . . . . . . . 150°C Maximum Storage Temperature Range . . . . . . . . . . -65°C to 150°C Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300°C (Lead Tips Only) Operating Conditions Temperature Range ICL32XXC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C ICL32XXI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to 85°C CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. NOTE: 3. JA is measured with the component mounted on a low effective thermal conductivity test board in free air. See Tech Brief TB379 for details. Electrical Specifications Test Conditions: VCC = 3V to 5.5V, C1 - C4 = 0.1F (ICL3238: C1 - C4 = 0.22F @ VCC = 3V); Unless Otherwise Specified. Typicals are at TA = 25°C PARAMETER TEST CONDITIONS TEMP (°C) MIN TYP MAX UNITS DC CHARACTERISTICS Supply Current, Automatic Powerdown All RIN Open, FORCEON = GND, FORCEOFF = VCC 25 - 1.0 10 A Supply Current, Powerdown FORCEOFF = GND 25 - 1.0 10 A Supply Current, Automatic Powerdown Disabled All Outputs Unloaded, FORCEON = FORCEOFF = VCC ICL3244, VCC = 3V 25 - 0.3 1.0 mA All Others, VCC = 3.15V 25 - 0.3 1.0 mA LOGIC AND TRANSMITTER INPUTS AND RECEIVER OUTPUTS Input Logic Threshold Low TIN, FORCEON, FORCEOFF Full - - 0.8 V Input Logic Threshold High TIN, FORCEON, FORCEOFF VCC = 3.3V Full 2.0 - - V VCC = 5.0V Full 2.4 - - V Transmitter Input Hysteresis 25 - 0.5 - V Input Leakage Current TIN, FORCEON, FORCEOFF Full - 0.01 1.0 A Output Leakage Current FORCEOFF = GND Full - 0.05 10 A Output Voltage Low IOUT = 1.6mA Full - - 0.4 V Output Voltage High IOUT = -1.0mA Full VCC -0.6 VCC -0.1 - V RECEIVER INPUTS Input Voltage Range Full -25 - 25 V Input Threshold Low VCC = 3.3V 25 0.6 1.2 - V VCC = 5.0V 25 0.8 1.5 - V Input Threshold High VCC = 3.3V 25 - 1.5 2.4 V VCC = 5.0V 25 - 1.8 2.4 V Input Hysteresis 25 - 0.5 - V Input Resistance 25 3 5 7 k TRANSMITTER OUTPUTS Output Voltage Swing All Transmitter Outputs Loaded with 3k to Ground Full 5.0 5.4 - V Output Resistance VCC = V+ = V- = 0V, Transmitter Output = 2V Full 300 10M -  Output Short-Circuit Current Full - 35 60 mA Output Leakage Current VOUT =12V, VCC = 0V or 3V to 5.5V, Automatic Powerdown or FORCEOFF = GND Full - - 25 AFN4876 Rev 10.00 Page 6 of 18 March 1, 2006

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ICL3224, ICL3226, I CL3238, ICL3244MOUSE DRIVEABILITY (ICL3244 Only) Transmitter Output Voltage (See Figure 11) T1IN = T2IN = GND, T3IN = VCC, T3OUT Loaded with 3kto GND, T1OUT and T2OUT Loaded with 2.5mA Each Full 5 - - V ENHANCED AUTOMATIC POWERDOWN (FORCEON = GND, FORCEOFF = VCC) Receiver Input Thresholds to INVALID High See Figure 6 Full -2.7 - 2.7 V Receiver Input Thresholds to INVALID Low See Figure 6 Full -0.3 - 0.3 V INVALID, READY Output Voltage Low IOUT = 1.6mA Full - - 0.4 V INVALID, READY Output Voltage High IOUT = -1.0mA Full VCC-0.6 - - V Receiver Positive or Negative Threshold to INVALID High Delay (tINVH) ICL3238 25 - 0.1 - s All Others 25 - 1 - s Receiver Positive or Negative Threshold to INVALID Low Delay (tINVL) ICL3238 25 - 50 - s All Others 25 - 30 - s Receiver or Transmitter Edge to Transmitters Enabled Delay (tWU) ICL3238, Note 5 25 - 25 - s All Others, Note 5 25 - 100 - s Receiver or Transmitter Edge to Transmitters Disabled Delay (tAUTOPWDN) Note 5 Full 15 30 60 sec TIMING CHARACTERISTICS Maximum Data Rate RL = 3kCL = 1000pF, One Transmitter Switching Full 250 500 - kbps Receiver Propagation Delay Receiver Input to Receiver Output, CL = 150pF tPHL 25 - 0.15 - s tPLH 25 - 0.15 - s Receiver Output Enable Time Normal Operation (ICL3238/44 Only) 25 - 200 - ns Receiver Output Disable Time Normal Operation (ICL3238/44 Only) 25 - 200 - ns Transmitter Skew tPHL - tPLH 25 - 100 - ns Receiver Skew tPHL - tPLH 25 - 50 - ns Transition Region Slew Rate VCC = 3.3V, RL = 3kto 7k Measured From 3V to -3V or -3V to 3V CL = 150pF to 1000pF 25 6 - 30 V/s CL = 150pF to 2500pF 25 4 8 30 V/s ESD PERFORMANCE RS-232 Pins (TOUT, RIN) Human Body Model 25 - 15 - kV IEC61000-4-2 Contact Discharge 25 - 8 - kV IEC61000-4-2 Air Gap Discharge 25 - 10 - kV All Other Pins Human Body Model 25 - 2.5 - kV NOTE: 4. An “edge” is defined as a transition through the transmitter or receiver input thresholds. Electrical Specifications Test Conditions: VCC = 3V to 5.5V, C1 - C4 = 0.1F (ICL3238: C1 - C4 = 0.22F @ VCC = 3V); Unless Otherwise Specified. Typicals are at TA = 25°C (Continued) PARAMETER TEST CONDITIONS TEMP (°C) MIN TYP MAX UNITSFN4876 Rev 10.00 Page 7 of 18 March 1, 2006

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ICL3224, ICL3226, I CL3238, ICL3244Detailed Description These ICL32XX interface ICs operate from a single +3V to +5.5V supply, guarantee a 250kbps minimum data rate, require only four small external 0.1F capacitors, feature low power consumption, and meet all ElA RS-232C and V.28 specifications. The circuit is divided into three sections: The charge pump, the transmitters, and the receivers. Charge-Pump Intersil’s new ICL32XX family utilizes regulated on-chip dual charge pumps as voltage doublers, and voltage inverters to generate 5.5V transmitter supplies from a VCC supply as low as 3.0V. This allows these devices to maintain RS-232 compliant output levels over the 10% tolerance range of 3.3V powered systems. The efficient on-chip power supplies require only four small, external 0.1F capacitors for the voltage doubler and inverter functions at VCC = 3.3V. See the “Capacitor Selection” section, and Table 3 for capacitor recommendations for other operating conditions. The charge pumps operate discontinuously (i.e., they turn off as soon as the V+ and V- supplies are pumped up to the nominal values), resulting in significant power savings. Transmitters The transmitters are proprietary, low dropout, inverting drivers that translate TTL/CMOS inputs to EIA/TIA-232 output levels. Coupled with the on-chip 5.5V supplies, these transmitters deliver true RS-232 levels over a wide range of single supply system voltages. Transmitter outputs disable and assume a high impedance state when the device enters the powerdown mode (see Table 2). These outputs may be driven to 12V when disabled. All devices guarantee a 250kbps data rate for full load conditions (3k and 1000pF), VCC  3.0V, with one transmitter operating at full speed. Under more typical conditions of VCC  3.3V, RL = 3k, and CL = 250pF, one transmitter easily operates at 1Mbps. Transmitter inputs float if left unconnected, and may cause ICC increases. Connect unused inputs to GND for the best performance. Receivers All the ICL32XX devices contain standard inverting receivers, but only the ICL3238 and ICL3244 receivers can tristate, via the FORCEOFF control line. Additionally, the ICL3238 and ICL3244 include a noninverting (monitor) receiver (denoted by the ROUTB label) that is always active, regardless of the state of any control lines. Both receiver types convert RS-232 signals to CMOS output levels and accept inputs up to 25V while presenting the required 3k to 7k input impedance (see Figure 1) even if the power is off (VCC = 0V). The receivers’ Schmitt trigger input stage uses hysteresis to increase noise immunity and decrease errors due to slow input signal transitions. The ICL3238 and ICL3244 inverting receivers disable during forced (manual) powerdown, but not during automatic powerdown (see Table 2). Conversely, the monitor receiver remains active even during manual powerdown making it extremely useful for Ring Indicator monitoring. Standard receivers driving powered down peripherals must be disabled to prevent current flow through the peripheral’s protection diodes (see Figures 2 and 3). This renders them useless for wake up functions, but the corresponding monitor receiver can be dedicated to this task as shown in Figure 3. RXOUT GND  VROUT  VCC5k RXIN -25V  VRIN  +25V GND VCC FIGURE 1. INVERTING RECEIVER CONNECTIONS FIGURE 2. POWER DRAIN THROUGH POWERED DOWN PERIPHERAL OLD VCC POWERED GND SHDN = GND VCC Rx Tx VCC CURRENT VOUT = VCC FLOW RS-232 CHIP DOWN UART FIGURE 3. DISABLED RECEIVERS PREVENT POWER DRAIN ICL3238/44 TRANSITION RX TX R2OUTB R2OUT T1IN FORCEOFF = GND VCC VCC TO R2IN T1OUT VOUT = HI-Z POWERED DETECTOR DOWN UART WAKE-UP LOGICFN4876 Rev 10.00 Page 8 of 18 March 1, 2006

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ICL3224, ICL3226, I CL3238, ICL3244Powerdown Functionality This 3V family of RS-232 interface devices requires a nominal supply current of 0.3mA during normal operation (not in powerdown mode). This is considerably less than the 5mA to 11mA current required of 5V RS-232 devices. The already low current requirement drops significantly when the device enters powerdown mode. In powerdown, supply current drops to 1A, because the on-chip charge pump turns off (V+ collapses to VCC, V- collapses to GND), and the transmitter outputs tristate. Inverting receiver outputs may or may not disable in powerdown; refer to Table 2 for details. This micro-power mode makes these devices ideal for battery powered and portable applications. Software Controlled (Manual) Powerdown These devices allow the user to force the IC into the low power, standby state, and utilize a two pin approach where the FORCEON and FORCEOFF inputs determine the IC’s mode. For always enabled operation, FORCEON and FORCEOFF are both strapped high. To switch between active and powerdown modes, under logic or software control, only the FORCEOFF input need be driven. The FORCEON state isn’t critical, as FORCEOFF dominates over FORCEON. Nevertheless, if strictly manual control over powerdown is desired, the user must strap FORCEON high to disable the enhanced automatic powerdown circuitry. ICL3238 and ICL3244 inverting (standard) receiver outputs also disable when the device is in powerdown, thereby eliminating the possible current path through a shutdown peripheral’s input protection diode (see Figures 2 and 3). Connecting FORCEOFF and FORCEON together disables the enhanced automatic powerdown feature, enabling them to function as a manual SHUTDOWN input (see Figure 4). TABLE 2. POWERDOWN LOGIC TRUTH TABLE RCVR OR XMTR EDGE WITHIN 30 SEC? FORCEOFF INPUT FORCEON INPUT TRANSMITTER OUTPUTS RECEIVER OUTPUTS (NOTE 6) ROUTB OUTPUTS RS-232 LEVEL PRESENT AT RECEIVER INPUT? INVALID OUTPUT MODE OF OPERATION ICL3224, ICL3226 NO H H Active Active N.A. NO L Normal Operation (Enhanced Auto Powerdown Disabled)NO H H Active Active N.A. YES H YES H L Active Active N.A. NO L Normal Operation (Enhanced Auto Powerdown Enabled)YES H L Active Active N.A. YES H NO H L High-Z Active N.A. NO L Powerdown Due to Enhanced Auto Powerdown LogicNO H L High-Z Active N.A. YES H X L X High-Z Active N.A. NO L Manual Powerdown X L X High-Z Active N.A. YES H ICL322X - INVALID DRIVING FORCEON AND FORCEOFF (EMULATES AUTOMATIC POWERDOWN) X NOTE 7 NOTE 7 Active Active N.A. YES H Normal Operation X NOTE 7 NOTE 7 High-Z Active N.A. NO L Forced Auto Powerdown ICL3238, ICL3244 NO H H Active Active Active NO L Normal Operation (Enhanced Auto Powerdown Disabled)NO H H Active Active Active YES H YES H L Active Active Active NO L Normal Operation (Enhanced Auto Powerdown Enabled)YES H L Active Active Active YES H NO H L High-Z Active Active NO L Powerdown Due to Enhanced Auto Powerdown LogicNO H L High-Z Active Active YES H X L X High-Z High-Z Active NO L Manual Powerdown X L X High-Z High-Z Active YES H ICL3238, ICL3244 - INVALID DRIVING FORCEON AND FORCEOFF (EMULATES AUTOMATIC POWERDOWN) X NOTE 7 NOTE 7 Active Active Active YES H Normal Operation X NOTE 7 NOTE 7 High-Z High-Z Active NO L Forced Auto Powerdown NOTES: 5. Applies only to the ICL3238 and ICL3244. 6. Input is connected to INVALID Output.FN4876 Rev 10.00 Page 9 of 18 March 1, 2006

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