TLC7701, TLC7725, TLC7703, TLC7733, TLC7705
MICROPOWER SUPPLY VOLTAGE SUPERVISORS
SLVS087K – DECEMBER 1994 – REVISED JULY 1999
D
D
D
D
D
D
D
D
D
D
D
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 . . . – 40°C to 125°C
D, JG, P OR PW PACKAGE
(TOP VIEW)
CONTROL
RESIN
CT
GND
1
2
3
4
8
7
6
5
V
DD
SENSE
RESET
RESET
U PACKAGE
(TOP VIEW)
NC
CONTROL
RESIN
CT
GND
1
2
3
4
5
10
9
8
7
6
NC
V
DD
SENSE
RESET
RESET
description
NC
CONTROL
NC
VDD
NC
NC
RESIN
NC
CT
NC
4
5
6
7
8
3 2 1 20 19
18
17
16
15
14
9 10 11 12 13
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
FK PACKAGE
(TOP VIEW)
NC
SENSE
NC
RESET
NC
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.
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
RESET
NC
NC
GND
NC
1
TI [ TEXAS INSTRUMENTS ]
