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ST3485ECDR

hot ST3485ECDR

ST3485ECDR

For Reference Only

Part Number ST3485ECDR
Manufacturer STMicroelectronics
Description IC TXRX RS422/485 15MBPS 8SO
Datasheet ST3485ECDR Datasheet
Package 8-SOIC (0.154", 3.90mm Width)
In Stock 73288 piece(s)
Unit Price $ 0.6076 *
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ST3485ECDR

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ST3485ECDR Specifications

ManufacturerSTMicroelectronics
CategoryIntegrated Circuits (ICs) - Interface - Drivers, Receivers, Transceivers
Datasheet ST3485ECDR Datasheet
Package8-SOIC (0.154", 3.90mm Width)
Series-
TypeTransceiver
ProtocolRS422, RS485
Number of Drivers/Receivers1/1
DuplexHalf
Receiver Hysteresis70mV
Data Rate15Mbps
Voltage - Supply3 V ~ 3.6 V
Operating Temperature0°C ~ 70°C
Mounting TypeSurface Mount
Package / Case8-SOIC (0.154", 3.90mm Width)
Supplier Device Package8-SO

ST3485ECDR Datasheet

Page 1

Page 2

October 2017 DocID9102 Rev 11 1/24 This is information on a product in full production. www.st.com ST3485EB, ST3485EC, ST3485EI, ST3485EIY 3.3 V powered, 15 kV ESD protected, up to 12 Mbps RS-485/ RS-422 transceiver Datasheet - production data Features  ESD protection  ±15 kV IEC 61000-4-2 air discharge  ±8 kV IEC 61000-4-2 contact discharge  Operate from a single 3.3 V supply - no charge pump required  Interoperable with 5 V logic  1 µA low current shutdown mode max.  Guaranteed 12 Mbps data rate  -7 to 12 V common mode input voltage range  Half duplex versions available  Industry standard 75176 pinout  Current limiting and thermal shutdown for driver overload protection  Guaranteed high receiver output state for floating inputs with no signal present  Allow up to 64 transceivers on the bus  Available in SO8 package  Automotive grade (ST3485EIY) Description The ST3485EB/EC/EI/EIY device is ±15 kV ESD protected, 3.3 V low power transceiver for RS- 485 and RS-422 communications. The device contains one driver and one receiver in half duplex configuration. The ST3485E device transmits and receives at a guaranteed data rate of at least 12 Mbps. All transmitter outputs and receiver inputs are protected to ±15 kV IEC 61000-4-2 air discharge. The driver is short-circuit current limited and is protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high impedance state. Table 1: Device summary Order code Temp. range Package Packing ST3485ECDR 0 to 70 °C SO8 (tape and reel) 2500 parts per reel ST3485EBDR -40 to 85 °C ST3485EIDT -40 to 125 °C ST3485EIYDT

Page 3

Contents ST3485EB, ST3485EC, ST3485EI, ST3485EIY 2/24 DocID9102 Rev 11 Contents 1 Pin configuration ............................................................................. 3 2 Truth tables ...................................................................................... 4 3 Maximum ratings ............................................................................. 5 4 Electrical characteristics ................................................................ 6 5 Test circuits and typical characteristics ...................................... 10 6 Package information ..................................................................... 19 6.1 SO8 package information ................................................................ 19 6.2 SO8 tape and reel information ........................................................ 20 7 Ordering information ..................................................................... 21 8 Revision history ............................................................................ 22

Page 4

ST3485EB, ST3485EC, ST3485EI, ST3485EIY Pin configuration DocID9102 Rev 11 3/24 1 Pin configuration Figure 1: Pin connections Table 2: Pin description Pin n° Symbol Name and function 1 RO Receiver output. If A > B by 200 mV, RO will be high; if A < B by 200 mV, RO will be low. 2 RE Receiver output enable. RO is enabled when RE is low; RO is high impedance when RE is high. If RE is high and DE is low, the device will enter a low power shutdown mode. 3 DE Driver output enable. The driver outputs are enabled by bringing DE high. They are high impedance when DE is low. If RE is high DE is low, the device will enter a low-power shutdown mode. If the driver outputs are enabled, the part functions as line driver, while they are high impedance, it functions as line receivers if RE is low. 4 DI Driver input. A low on DI forces output A low and output B high. Similarly, a high on DI forces output A high and output B low. 5 GND Ground. 6 A Non-inverting receiver input and non-inverting driver output. 7 B Inverting receiver input and inverting driver output. 8 VCC Supply voltage: VCC = 3 V to 3.6 V. RO RE DE DI VCC GND B A 1 2 3 4 8 7 6 5

Page 5

Truth tables ST3485EB, ST3485EC, ST3485EI, ST3485EIY 4/24 DocID9102 Rev 11 2 Truth tables Table 3: Truth table (driver) Inputs Outputs Mode RE DE DI B A X H H L H Normal L H L L L X Z Z H Shutdown Note: X = “don’t care”; Z = high impedance Table 4: Truth table (receiver) Inputs Output Mode RE DE A-B RO L L ≥ 0.2 V H Normal ≤ -0.2 V L Inputs open H H X Z Shutdown Note: X = “don’t care”; Z = high impedance

Page 6

ST3485EB, ST3485EC, ST3485EI, ST3485EIY Maximum ratings DocID9102 Rev 11 5/24 3 Maximum ratings Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Table 5: Absolute maximum ratings Symbol Parameter Value Unit VCC Supply voltage 7 V VI Control input voltage ( RE , DE) -0.3 to 7 VDI Driver input voltage (DI) -0.3 to 7 VDO Driver output voltage (A, B) ±14 VRI Receiver input voltage (A, B) ±14 VRO Receiver output voltage (RO) -0.3 to (VCC + 0.3) ESD HBM: human body model for the line inputs (A and B) (1) 12 kV HBM: human body model for the logic inputs (DI, DE, RE ) (1) 4 HBM: human body model for all other pins (1) 2 CDM: charged device model (2) 1.5 Notes: (1)Human body model: 100 pF discharged through a 1.5 kΩ resistor between two pins of the device, done for all couples of pin combinations with other pins floating. (2)Charged device model: all pins plus package are charged together to the specified voltage and then discharged directly to ground.

Page 7

Electrical characteristics ST3485EB, ST3485EC, ST3485EI, ST3485EIY 6/24 DocID9102 Rev 11 4 Electrical characteristics Table 6: Electrical characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = - 40 to 85 °C for ST3485EBDR, TA = -40 to 125 °C for ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical values are referred to TA = 25 °C) Symbol Parameter Test conditions Min. Typ. Max. Unit ISUPPLY VCC power supply current No load, DI = 0 V or VCC DE = VCC, RE = 0 V or VCC — 1.3 2.2 mA DE = 0 V, RE = 0 V 1.2 1.9 ISHDN Shutdown supply current DE = 0 V, RE = VCC, DI = 0 V or VCC 0.002 1 µA Table 7: Logic input electrical characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = -40 to 85 °C for ST3485EBDR, TA = -40 to 125 °C for ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical values are referred to TA = 25 °C) Symbol Parameter Test conditions Min. Typ. Max. Unit VIL Input logic threshold low DE, DI, RE 1.3 0.8 V VIH Input logic threshold high DE, DI, RE 2 IIN1 Logic input current DE, DI, RE ±2.0 µA IIN2 Input current (A, B) DE = 0 V, VCC= 0 or 3.6 V VIN = 12 V 1 mA VIN = -7 V -0.8

Page 8

ST3485EB, ST3485EC, ST3485EI, ST3485EIY Electrical characteristics DocID9102 Rev 11 7/24 Table 8: Transmitter electrical characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = -40 to 85 °C for ST3485EBDR, TA = -40 to 125 °C for ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical values are referred to TA = 25 °C) Symbol Parameter Test conditions Min. Typ. Max. Unit VOD Differential drive output RL= 100 Ω (RS-422) (Figure 2) 2 — V RL= 54 Ω (RS-485) (Figure 2) 1.5 RL= 60 Ω (RS-485) (Figure 3) 1.5 ∆VOD Change in magnitude of driver differential output voltage for complementary output states (1) RL= 54 Ω or 100 Ω (Figure 2) 0.2 VOC Driver common mode output voltage RL= 54 Ω or 100 Ω (Figure 2) 3 ∆VOC Change in magnitude of driver common mode output voltage(1) RL= 54 Ω or 100 Ω (Figure 2) 0.2 IOSD Driver short-circuit output current ±250 mA Notes: (1)∆VOD and ∆VOC are the changes in VOD and VOC, respectively, when the DI input changes state. Table 9: Receiver electrical characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = -40 to 85 °C for ST3485EBDR, TA = -40 to 125 °C for ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical values are referred to TA = 25 °C) Symbol Parameter Test conditions Min. Typ. Max. Unit VTH Receiver differential threshold voltage VCM = -7 V to 12 V, DE = 0 -0.2 0.2 V ∆VTH Receiver input hysteresis VCM = 0 V 70 mV VOH Receiver output high voltage IOUT = -4 mA, VID = 200 mV (Figure 4) 2 V VOL Receiver output low voltage IOUT = 4 mA, VID = -200 mV (Figure 4) 0.4 IOZR 3-state (high impedance) output current at receiver VCC = 3.6 V, VO = 0 V to VCC ±1 µA RRIN Receiver input resistance VCM = -7 V to 12 V 24 kΩ IOSR Receiver short-circuit current VRO = 0 V to VCC 7 60 mA

Page 9

Electrical characteristics ST3485EB, ST3485EC, ST3485EI, ST3485EIY 8/24 DocID9102 Rev 11 Table 10: Driver switching characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = -40 to 85 °C for ST3485EBDR, TA = -40 to 125 °C for ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical values are referred to TA = 25 °C) Symbol Parameter Test conditions Min. Typ. Max. Unit DR Maximum data rate 12 15 Mbps tDD Differential output delay RL= 60 Ω, CL = 15 pF (Figure 5 and Figure 6) 18 30 ns tTD Differential output transition time RL= 60 Ω, CL = 15 pF (Figure 5 and Figure 6) 12 20 tPLH tPHL Propagation delay RL= 27 Ω, CL = 15 pF (Figure 9 and Figure 10) 18 30 tPDS |tPLH - tPHL| driver propagation delay skew (1) RL= 27 Ω, CL = 15 pF (Figure 9 and Figure 10) 2 5 tPZL Output enable time RL= 110 Ω (Figure 11 and Figure 12) 19 35 tPZH Output enable time RL= 110 Ω (Figure 7 and Figure 8) 30 50 tPHZ Output disable time RL= 110 Ω (Figure 7 and Figure 8) 19 35 tPLZ Output disable time RL= 110 Ω (Figure 11 and Figure 12) 30 50 tSKEW Differential output delay skew 1 3 tPSH Driver enable from shutdown to output high RL = 110 Ω (Figure 7 and Figure 8) 30 50 tPSL Driver enable from shutdown to output low RL = 110 Ω (Figure 11 and Figure 12) 19 35 Notes: (1)Measured on |tPLH(A)-tPHL(A)| and |tPLH(B)-tPHL(B)|.

Page 10

ST3485EB, ST3485EC, ST3485EI, ST3485EIY Electrical characteristics DocID9102 Rev 11 9/24 Table 11: Receiver switching characteristics (VCC = 3 V to 3.6 V, TA = 0 to 70 °C for ST3485ECDR, TA = -40 to 85 °C for ST3485EBDR, TA = -40 to 125 °C for ST3485EIDT and ST3485EIYDT, unless otherwise specified. Typical values are referred to TA = 25 °C) Symbol Parameter Test conditions Min. Typ. Max. Unit tRPLH, tRPHL Propagation delay VID = 0 V to 3 V, CL = 15 pF (Figure 13 and Figure 14) — 30 50 ns tRPDS |tRPLH - tRPHL| receiver propagation delay skew VID = 0 V to 3 V, CL = 15 pF (Figure 13 and Figure 14) 1 3 tPRZL Receiver output enable time to low level CL = 15 pF (Figure 15 and Figure 17) 10 20 tPRZH Receiver output enable time to high level CL = 15 pF (Figure 15 and Figure 16) 10 20 tPRHZ Receiver output disable time from high level CL = 15 pF (Figure 15 and Figure 18) 10 20 tPRLZ Receiver output disable time from low level CL = 15 pF (Figure 15 and Figure 19) 10 20 tPRSH Receiver output enable time from shutdown to high level CL = 15 pF (Figure 15 and Figure 16) 10 20 tPRSL Receiver output enable time from shutdown to low level CL = 15 pF (Figure 15 and Figure 17) 20 40 µs Notes: 1. ∆VOD and ∆VOC are the changes in VOD and VOC, respectively, when the DI input changes state. 2. Measured on |tPLH(A) - tPHL(A)| and |tPLH(B) - tPHL(B)|. 3. The transceivers are put into shutdown by bring RE high and DE low. If the input are in state for less than 80 ns, the part are guaranteed not to enter shutdown. If the inputs are in this state for at least 300 ns, the parts are guaranteed to have entered shutdown.

ST3485ECDR Reviews

Average User Rating
5 / 5 (149)
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5 ★
134
4 ★
15
3 ★
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1 ★
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Carol*****ittle

December 25, 2019

These are the most popular variety of components of different types!

Mich*****Holmes

December 10, 2019

Parts received and tested, all can work, thank you

Mart*****eyers

November 25, 2019

I've never had a problem with Heisener. Packages arrive on time and in great condition.

Cay***** Vig

August 23, 2019

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Bayl*****ester

August 13, 2019

Rec today in good order & condition . Thanks for speedy delivery.Regards.

Die*****Huynh

July 8, 2019

Arrived safely. All OK. Thanks

Koa *****anan

June 25, 2019

Fast shipping. Got it in few dayss from Hong Kong

Marl***** Bass

April 23, 2019

Good and works well. What else is there to say about it.

Nich***** Dubey

April 16, 2019

What can I say, great value for the money. I only needed 2 but now I have some spares for future projects. They got the job done, nothing more I can say.

Rodr*****Shan

February 1, 2019

I got a very helpful customer service here. Definitely will order my electronics needs again.

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