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1FEATURES

? Power-On Reset Generator

? Automatic Reset Generation After Voltage

Drop

? Precision Voltage Sensor

? Temperature-Compensated Voltage Reference

? Programmable Delay Time by External

Capacitor

? Supply Voltage Range . . . 2 V to 6 V

? Defined RESET Output from VDD ≥ 1 V

? Power-Down Control Support for Static RAM

With Battery Backup

? Maximum Supply Current of 16 mA

? Power Saving Totem-Pole Outputs

SUPPORTS DEFENSE, AEROSPACE,

AND MEDICAL APPLICATIONS

? Controlled Baseline

? One Assembly/Test Site

? One Fabrication Site

? Available in Extended (–40°C/125°C

and –55°C/125°C), Temperature Ranges(1)

? Extended Product Life Cycle

? Extended Product-Change Notification

? Product Traceability

DESCRIPTION

The TLC77xx family of micropower supply voltage supervisors provide reset control, primarily in microcomputer

and microprocessor systems.

During power-on, RESET is asserted when VDD reaches 1 V. After minimum VDD (≥ 2 V) is established, the

circuit monitors SENSE voltage and keeps the reset outputs active as long as SENSE voltage (VI(SENSE)) remains

below the threshold voltage. An internal timer delays return of the output to the inactive state to ensure proper

system reset. The delay time (td) is determined by an external capacitor:

td = 2.1 × 104 × CT (1)

Where

CT is in farads

td is in seconds

Except for the TLC7701, which can be customized with two external resistors, each supervisor has a fixed sense

threshold voltage set by an internal voltage divider. When SENSE voltage drops below the threshold voltage, the

outputs become active and stay in that state until SENSE voltage returns above threshold voltage and the delay

time (td) has expired.