TPS3600D20, TPS3600D25, TPS3600D33, TPS3600D50
BATTERY-BACKUP SUPERVISORS FOR LOW-POWER PROCESSORS
SLVS336A DECEMBER 2000 REVISED APRIL 2001
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
features
D
Supply Current of 40
A (Max)
D
Precision Supply Voltage Monitor
2.0 V, 2.5 V, 3.3 V, 5.0 V
Other Versions on Request
D
Watchdog Timer With 800-ms Time-Out
D
Backup-Battery Voltage Can Exceed V
DD
D
Power-On Reset Generator With Fixed
100-ms Reset Delay Time
D
Battery OK Output
D
Voltage Monitor for Power-Fail or
Low-Battery Monitoring
D
Manual Switchover to Battery-Backup
Mode
D
Chip-Enable Gating 3 ns (at V
DD
= 5 V)
Max. Propagation Delay
D
Manual Reset
D
Battery Freshness Seal
D
14-Pin TSSOP 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
typical operating circuit
CEIN
CEOUT
VDD
VBAT
PFI
Backup
Battery
RESET
WDI
PFO
BATTOK
BATTON
VOUT
GND
MR
MSWITCH
Manual
Reset
Rx
Ry
External
Source
0.1
F
Power
Supply
Address Bus
GND
RESET
I/O
I/O
I/O
I/O
VCC
Data Bus
16
Address
Decoder
Switchover
Capacitor
0.1
F
TPS3600
uC
CMOS
RAM
CE
VCC
8
CMOS
RAM
CE
VCC
8
Real-
Time
Clock
VCC
Copyright
2001, 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.
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.
1
2
3
4
5
6
7
VBAT
RESET
WDI
MR
CEOUT
BATTOK
PFO
VOUT
VDD
GND
MSWITCH
CEIN
BATTON
PFI
TSSOP (PW) Package
(TOP VIEW)
ACTUAL SIZE
(5,10mm x 6,60mm)
14
13
12
11
10
9
8
TPS3600D20, TPS3600D25, TPS3600D33, TPS3600D50
BATTERY-BACKUP SUPERVISORS FOR LOW-POWER PROCESSORS
SLVS336A DECEMBER 2000 REVISED APRIL 2001
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description
The TPS3600 family of supervisory circuits monitor and control processor activity. In case of power-fail or
brownout conditions, the backup-battery switchover function of TPS3600 allows to run a low-power processor
and its peripherals from the installed backup battery without asserting a reset beforehand.
During power on, RESET is asserted when the supply voltage (V
DD
or V
BAT
) becomes higher than V
res
.
Thereafter, the supply voltage supervisor monitors V
OUT
and keeps RESET output active as long as V
OUT
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. This delay timer starts its time-out, after V
OUT
has risen above the
threshold voltage (V
IT
). In case of a brownout or power failure of both supply sources, a voltage drop below the
threshold voltage (V
IT
) get detected and the output becomes active (low) again.
The product spectrum is designed for supply voltages of 2 V, 2.5 V, 3.3 V, and 5 V. The circuits are available
in a 14-pin TSSOP package. They are characterized for operation over a temperature range of 40
C to 85
C.
PACKAGE INFORMATION
TA
DEVICE NAME
TPS3600D20
40
C to 85
C
TPS3600D25
40
C to 85
C
TPS3600D33
TPS3600D50
ordering information application specific versions (see Note)
TPS360
0
D
PW
R
Reel
Package
20
Nominal Supply Voltage
Nominal BATTOK Threshold Voltage
Functionality
Family
DEVICE NAME
NOMINAL VOLTAGE, VNOM
TPS3600x20 PW
2.0 V
TPS3600x25 PW
2.5 V
TPS3600x33 PW
3.3 V
TPS3600x50 PW
5.0 V
NOMINAL BATTOK
DEVICE NAME
THRESHOLD VOLTAGE, VBOK
TPS3600Dxx PW
VIT + 7%
TPS3600Fxx PW
{
VIT + 6%
TPS3600Hxx PW
{
VIT + 8%
TPS3600Jxx PW
{
VIT + 10%
For the application specific versions, please contact the local TI sales
office for availability and lead time.
TPS3600D20, TPS3600D25, TPS3600D33, TPS3600D50
BATTERY-BACKUP SUPERVISORS FOR LOW-POWER PROCESSORS
SLVS336A DECEMBER 2000 REVISED APRIL 2001
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
FUNCTION TABLES
VDD > VSW
VOUT > VIT
VDD > VBAT
MSWITCH
MR
VOUT
BATTON
RESET
CEOUT
0
0
0
0
0
VBAT
1
0
DIS
0
0
0
0
1
VBAT
1
0
DIS
0
0
0
1
0
VBAT
1
0
DIS
0
0
0
1
1
VBAT
1
0
DIS
0
0
1
0
0
VDD
0
0
DIS
0
0
1
0
1
VDD
0
0
DIS
0
0
1
1
0
VBAT
1
0
DIS
0
0
1
1
1
VBAT
1
0
DIS
0
1
0
0
0
VBAT
1
0
DIS
0
1
0
0
1
VBAT
1
1
EN
0
1
0
1
0
VBAT
1
0
DIS
0
1
0
1
1
VBAT
1
1
EN
0
1
1
0
0
VDD
0
0
DIS
0
1
1
0
1
VDD
0
1
EN
0
1
1
1
0
VBAT
1
0
DIS
0
1
1
1
1
VBAT
1
1
EN
1
1
0
0
0
VDD
0
0
DIS
1
1
0
0
1
VDD
0
1
EN
1
1
0
1
0
VBAT
1
0
DIS
1
1
0
1
1
VBAT
1
1
EN
1
1
1
0
0
VDD
0
0
DIS
1
1
1
0
1
VDD
0
1
EN
1
1
1
1
0
VBAT
1
0
DIS
1
1
1
1
1
VBAT
1
1
EN
VBAT > VBOK
BATTOK
0
0
1
1
CONDITION: VOUT > VDD(min)
CEIN
CEOUT
0
0
1
1
CONDITION: Enabled
PFI > VPFI
PFO
0
0
1
1
CONDITION: VOUT > VDD(min)
TPS3600D20, TPS3600D25, TPS3600D33, TPS3600D50
BATTERY-BACKUP SUPERVISORS FOR LOW-POWER PROCESSORS
SLVS336A DECEMBER 2000 REVISED APRIL 2001
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
functional schematic
Switch
Control
_
+
RESET
Logic
and
Timer
_
+
Reference
Voltage
or 1.15 V
VOUT
VOUT
RESET
CEOUT
VBAT
VDD
GND
TPS3600
MSWITCH
MR
_
+
Internal
Supply
Voltage
R1
R2
Oscillator
_
+
Watchdog
Logic
and
Control
40 k
Transition
Detector
BATTON
BATTOK
PFO
PFI
WDI
CEIN
TPS3600D20, TPS3600D25, TPS3600D33, TPS3600D50
BATTERY-BACKUP SUPERVISORS FOR LOW-POWER PROCESSORS
SLVS336A DECEMBER 2000 REVISED APRIL 2001
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
timing diagram
t
t
t
t
t
V(BOK)
V(SWP)
V(SWN)
V(IT)
VOUT
V(SWN)
RESET
BATTOK
1
0
BATTON
VBAT
VDD
VBAT
VDD
VBAT
VDD
VBAT
NOTES: A. MSWITCH = 0, MR = 1
NOTES: B. Timing diagram shown under normal operation, not in freshness seal mode.
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