TPS3613-01 Datasheet, PDF (1/15 Pages) Texas Instruments – Adustable battery-backup supervisor for ram retention

TPS3613Ć01
ADJUSTABLE BATTERYĆBACKUP SUPERVISOR
FOR RAM RETENTION
SLVS340B – DECEMBER 2000 – REVISED DECEMBER 2002
D Supply Current of 40 µA (Max)
D Battery Supply Current of 100 nA (Max)
D Supply Voltage Supervision Range:
– Adjustable
– Other Versions Available on Request
D Backup-Battery Voltage Can Exceed V_DD
D Power-On Reset Generator With Fixed
100-ms Reset Delay Time
D Active-High and Active-Low Reset Output
D Chip-Enable Gating . . . 3 ns (at V_DD = 5 V)
Max Propagation Delay
D 10-Pin MSOP Package
D Temperature Range . . . –40°C to 85°C
typical applications
D Fax Machines
D Set-Top Boxes
D Advanced Voice Mail Systems
D Portable Battery Powered Equipment
D Computer Equipment
D Advanced Modems
D Automotive Systems
D Portable Long-Time Monitoring Equipment
D Point-of-Sale Equipment
MSOP (DGS) Package
(TOP VIEW)
description
VOUT
VDD
The TPS3613-01 supervisory circuit monitors
GND
MR
and controls processor activity by providing
CEIN
backup-battery switchover for data retention of
CMOS RAM.
VBAT
RESET
SENSE
RESET
CEOUT
ACTUAL SIZE
3,05 mm x 4,98 mm
During power on, RESET is asserted when the supply voltage (V_DD or V_BAT) becomes higher than 1.1 V.
Thereafter, the supply voltage supervisor monitors V_DD and keeps RESET output active as long as V_DD remains
below the threshold voltage V_IT. An internal timer delays the return of the output to the inactive state (high) to
ensure proper system reset. The delay time starts after V_DD has risen above the threshold voltage V_IT.
When the supply voltage drops below the threshold voltage V_IT, the output becomes active (low) again.
The TPS3613-01 is available in a 10-pin MSOP package and is characterized for operation over a temperature
range of –40°C to 85°C.
typical operating circuit
Power
Supply
0.1 µF
Address
Decoder
Monitored
Voltage
CEIN CEOUT Backup
VDD
Rx
VBAT ^Battery
SENSE
Ry
RESET
TPS3613
Address Bus
uC
RESET
Data Bus
CE
CMOS
RAM
VCC
8
16
CE
CMOS
RAM
VCC
8
Real-
Time
Clock
VCC
Manual
Reset
MR
VOUT
GND
Switchover
Capacitor
0.1 µF
VCC
GND
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.
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.
Copyright  2002, Texas Instruments Incorporated
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