SLVS087M – DECEMBER 1994 – REVISED MARCH 2012
Micropower Supply Voltage Supervisors
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FEATURES
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 V
DD
≥
1 V
Power-Down Control Support for Static RAM
With Battery Backup
Maximum Supply Current of 16 µA
Power Saving Totem-Pole Outputs
Temperature Range . . . Up to –55°C to 125°C
DRB PACKAGE
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APPLICATIONS
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Medical Imaging
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 V
DD
reaches 1 V. After minimum V
DD
(≥2 V) is
established, the circuit monitors SENSE voltage and
keeps the reset outputs active as long as SENSE
voltage (V
I(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, t
d
, is determined by an external
capacitor:
t
d
= 2.1 × 10
4
× C
T
Where
C
T
is in farads
t
d
is in seconds
SPACER
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, t
d
, has expired.
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1994–2012, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
