TL7702A, TL7705A, TL7709A, TL7712A, TL7715A SUPPLY-VOLTAGE SUPERVISORS SLVS028E – APRIL 1983 – REVISED JULY 1999 D D D D D D D D OR P PACKAGE (TOP VIEW) Power-On Reset Generator Automatic Reset Generation After Voltage Drop Wide Supply-Voltage Range Precision Voltage Sensor Temperature-Compensated Voltage Reference True and Complement Reset Outputs Externally Adjustable Pulse Duration REF RESIN CT GND 1 8 2 7 3 6 4 5 VCC SENSE RESET RESET description The TL77xxA family of integrated-circuit supply-voltage supervisors is specifically designed for use as reset controllers in microcomputer and microprocessor systems. The supply-voltage supervisor monitors the supply for undervoltage conditions at the SENSE input. During power up, the RESET output becomes active (low) when VCC attains a value approaching 3.6 V. At this point (assuming that SENSE is above VIT+), the delay timer function activates a time delay, after which outputs RESET and RESET go inactive (high and low, respectively). When an undervoltage condition occurs during normal operation, outputs RESET and RESET go active. To ensure that a complete reset occurs, the reset outputs remain active for a time delay after the voltage at the SENSE input exceeds the positive-going threshold value. The time delay is determined by the value of the external capacitor CT: td = 1.3 × 104 × CT, where CT is in farads (F) and td is in seconds (s). During power down (assuming that SENSE is below VIT–), the outputs remain active until the VCC falls below a maximum of 2 V. After this, the outputs are undefined. An external capacitor (typically 0.1 µF for the TL77xxAC and TL77xxAI) must be connected to REF to reduce the influence of fast transients in the supply voltage. The TL77xxAC series is characterized for operation from 0°C to 70°C. The TL77xxAI series is characterized for operation from –40°C to 85°C. AVAILABLE OPTIONS PACKAGED DEVICES CHIP FORM (Y) SMALL OUTLINE (D) PLASTIC DIP (P) 0°C to 70°C TL7702ACD TL7705ACD TL7709ACD TL7712ACD TL7715ACD TL7702ACP TL7705ACP TL7709ACP TL7712ACP TL7715ACP TL7702ACY TL7705ACY TL7709ACY TL7712ACY TL7715ACY –40°C to 85°C TL7702AID TL7705AID TL7709AID TL7712AID TL7715AID TL7702AIP TL7705AIP TL7709AIP TL7712AIP TL7715AIP — — — — — TA The D package is available taped and reeled. Add the suffix R to the device type (e.g., TL7702ACDR). Chip forms are tested at 25°C. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Copyright © 1999, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1




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