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hot MIC809-5SYC3


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Part Number MIC809-5SYC3
Manufacturer Microchip Technology
Description IC SUPERVISOR 2.93V VTH SC70
Datasheet MIC809-5SYC3 Datasheet
Package SC-70, SOT-323
In Stock 37400 piece(s)
Unit Price Request a Quote
Lead Time Can Ship Immediately
Estimated Delivery Time Apr 4 - Apr 9 (Choose Expedited Shipping)
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MIC809-5SYC3 Specifications

ManufacturerMicrochip Technology
CategoryIntegrated Circuits (ICs) - PMIC - Supervisors
Datasheet MIC809-5SYC3 Datasheet
PackageSC-70, SOT-323
TypeSimple Reset/Power-On Reset
Number of Voltages Monitored1
OutputPush-Pull, Totem Pole
ResetActive Low
Reset Timeout140 ms Minimum
Voltage - Threshold2.93V
Operating Temperature-40°C ~ 85°C (TA)
Mounting TypeSurface Mount
Package / CaseSC-70, SOT-323
Supplier Device PackageSC-70-3

MIC809-5SYC3 Datasheet

Page 1

Page 2

July 2005 1 M9999-071305 MIC809-5 Micrel MIC809-5 Microprocessor Reset Circuit General Description The MIC809-5 is a power supply supervisor that provides under-voltage monitoring and power-on reset generation in an industry standard 3-pin SOT package and SC-70 pack- age. The reset output is asserted at power-on and any time the input voltage drops below the programmed threshold. It remains asserted for 30ms (min.) after the input subsequently rises back above the threshold boundary. The MIC809-5 has an active-low reset output. The MIC809-5 is inherently immune to brief power supply transients. Typical supply current is a low 5µA. For those applications that require a manual reset function, see the MIC811/812. For those applications that require a longer reset timeout, see the MIC809/810. (The MIC809-5 is identi- cal to the industry-standard MIC809 with the exception of a shorter reset timeout). Typical Application VCC /RESET µP /RESET MIC809-5 VCC VCC Features • Under-voltage monitor • Power-on reset generation (30ms minimum) • Choice of threshold voltages • Active-low reset output • No external components required • Rejects brief input transients • Industry standard package and pinout • 3-pin IttyBitty™ SOT23-3 package and SC-70 package Applications • PDAs, hand-held PCs • Embedded controllers • Telecommunications systems • Power supplies • Wireless/cellular systems • Networking hardware Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • Ordering Information Typical Nominal Application Threshold tRST Operating Part Number Marking Voltage* Voltage (ms) Temp. Range Package Pb-Free MIC809-5SU IX 3.3V±5% 2.93 30 –40°C to +85°C SOT23-3 No MIC809-5SBC3 IX 3.3V±5% 2.93 30 –40°C to +85°C SC70-3 No MIC809-5SUY IX 3.3V±5% 2.93 30 –40°C to +85°C SOT23-3 Yes MIC809-5SYC3 IX 3.3V±5% 2.93 30 –40°C to +85°C SC70-3 Yes *Other voltages available. Contact Micrel for details. Minimum order may apply. IttyBitty is a trademark of Micrel, Inc.

Page 3

MIC809-5 Micrel M9999-071305 2 July 2005 Pin Description Pin Number Pin Name Pin Function 1 GND Ground return for all IC functions. 2 /RESET Digital Output. Active-low. Asserted whenever VCC falls below the threshold voltage. It will remain asserted for no less than 30ms and be de-asserted after VCC returns above the threshold. 3 VCC Analog Input. Power supply input to the IC. Pin Configuration 1GND /RESET VCC3 2 MIC809-5 3-Lead SOT23 3-Lead SC-70

Page 4

July 2005 3 M9999-071305 MIC809-5 Micrel Absolute Maximum Ratings(1) Terminal Voltage (VCC) .................................–0.3V to +6.0V Input Current (VCC) ..................................................... 20mA Output Current (/RESET, RESET) .............................. 20mA Lead Temperature (soldering, 10 sec.) ...................... 300°C Storage Temperature (TS) .......................... –65°C to 150°C Rate of Rise (VCC) .................................................. 100V/µs ESD Rating(3) ................................................................ 3kV Operating Ratings(2) Ambient Temperature (TA) .......................... –40°C to +85°C Power Dissipation (TA = +70°C) .............................. 320mW Electrical Characteristics For typical values, VCC = 3.3V, TA = 25°C; bold are for –40°C to +85°C; unless otherwise noted Symbol Parameter Condition Min Typ Max Units VCC Operating Voltage Range TA = –40°C to 85°C 1 5.5 V ICC Supply Current VCC < 3.6V 5 10 µA VTH Reset Voltage Threshold S Voltage Options 2.85 2.93 3.00 V VHYST Typical hysteresis 5 mV tRST Reset Timeout Period 30 66 ms tPROP Propogation delay /RESET < VOL, 100mV Overdrive 14.5 µs VOH /RESET Output Voltage High ISOURCE = 500µA 0.8×VCC V VOL /RESET Output Voltage Low VCC = VTH min., ISINK = 1.2mA 0.3 V VCC > 1V, ISINK = 50µA 0.3 V Note 1. Exceeding the absolute maximum rating may damage the device. Note 2. The device is not guaranteed to function outside its operating rating. Note 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. Timing Diagram /RESET VCC VTH VTH tRST tRST Reset Timing Diagram

Page 5

MIC809-5 Micrel M9999-071305 4 July 2005 Functional Diagram + -Reset Threshold (V) VCC (3) RESET (2) RESET (MIC810) GND (1) RESET GENERATOR

Page 6

July 2005 5 M9999-071305 MIC809-5 Micrel Applications Information Microprocessor Reset The /RESET pin is asserted whenever VCC falls below the reset threshold voltage. The /RESET pin remains asserted for a period of 30ms after VCC has risen above the reset threshold voltage. The reset function ensures the micropro- cessor is properly reset and powers up in a known condition after a power failure. /RESET will remain valid with VCC as low as 1V. Transients on VCC The MIC809-5 is inherently immune to very short “glitches” on VCC. In the case of very brief transients, VCC may drop below the reset-voltage threshold without triggering a reset. As shown in the graph, the MIC809-5 is relatively immune to transients with typical duration of 20µs. The lines on the graph of Figure 1 represent the typical allowable transient duration for a given amount of threshold overdrive that will not generate a reset. The data was taken by adding nega- tive-going square-wave pulse to a DC input voltage set at 0.5V above actual measured threshold for the part being characterized. 0 5 10 15 20 25 0 200 400 600 800 1000 M A X . T R A N S IE N T D U R A TI O N (µ s) RESET COMP. OVERDRIVE, VTH –VCC (mV) Typical Transient Response VTH = 2.932 Figure 1. Comparator Overdrive vs. Duration Ensuring Proper Operation at Low VCC At levels of VCC below 1V, the MIC809-5’s output driver cannot always turn on sufficiently to produce a valid logic-low. In this situation, other circuits driven by /RESET could be allowed to float, causing undesired operation. (In most cases, however, it is expected that the circuits driven by the MIC809-5 will be similarly inoperative at VCC =1V.) If a given application requires that /RESET be valid below VCC = 1V, this can be accomplished by adding a pull-down resistor to the output. A value of 100kΩ is recommended, as this is usually an acceptable compromise of leakage current and pull-down current. The resistor’s value is not critical, however. See Figure 2. /RESET /RESET INPUT Microcontroller or Microprocessor GND 100k GND VIN RPULL-DOWN VCC VCC MIC809 Figure 2. Ensuring a Valid /RESET Signal at Low Voltage Interfacing to Processors with Bidirectional Reset Pins Some microprocessors have reset signal pins that are bidi- rectional, rather than input only. The Motorola 68HC11 fam- ily is one example. To prevent excessive current flow when the processor asserts its reset output, a series resistor is employed between the MIC809-5’s output and the reset pin. This limits the current that will flow between the MIC809-5 and the reset pin to a theoretical maximum of VCC/RSERIES. Because this resistor also limits the drive capability of the supervisor’s output, a buffer may be required to drive ad- ditional circuitry. See Figure 3. 4.7k BUFFER RESET SIGNAL to OTHER CIRCUITS VCC /RESET GND VIN MIC809 RESET I/O Microcontroller or Microprocessor GND VCC Figure 3. Interfacing to Processors with Bidirectional Reset Pins

MIC809-5SYC3 Reviews

Average User Rating
5 / 5 (92)
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4 ★
3 ★
2 ★
1 ★

Oli***** Koch

January 24, 2020

Worked good to turn my AC welder into a DC welder.


January 15, 2020

Good! quick and convenient delivery. product tracking with good advice.


January 7, 2020

I can find what I want, and also trust I'm getting what I paid for. Many times I had to send things back or eat the cost dealing shady sellers, either way it cost me.


December 22, 2019

Easy transaction. Very pleased with goods in perfect condition would recommend Heisener company.


November 16, 2019

High level customer service, and quick response.

Vict***** Fry

September 20, 2019

Heisener has everything! Each product is easy to search and navigate. No minimum quantities. Fast shipping!


September 3, 2019

Absolutely the best source for wire, connectors, terminal strips, panel lights, etc. for model railroaders. Web site is the best in the business.


September 1, 2019

Items arrived well pakaged, reasonable postage and as described. Top seller


August 27, 2019

Happy with purchase, would do business again


July 24, 2019

The parts as described and fast shipping. Thanks for the great service

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