Datasheet
1 of 12
FEATURES
Converts CMOS SRAM into nonvolatile
memory
Unconditionally write-protects SRAM when
V
CC
is out of tolerance
Automatically switches to battery backup
supply when V
CC
power failure occurs
Monitors voltage of a lithium cell and
provides advanced warning of impending
battery failure
Signals low-battery condition on active low
Battery Warning output signal
Automatic V
CC
power-fail detection for 3.0V
or 3.3V power supplies
Space-saving 8-pin DIP and SOIC packages
Optional 16-pin SOIC and 20-pin TSSOP
versions reset processor when power failure
occurs and hold processor in reset during
system power-up
Industrial temperature range of -40°C to
+85°C
PIN ASSIGNMENT
PIN DESCRIPTION
V
CCI
- Power Supply Input
V
CCO
- SRAM Power Supply Output
V
BAT
- Backup Battery Input
CEI
- Chip Enable Input
CEO
- Chip Enable Output
TOL - V
CC
Tolerance Select
BW
- Battery Warning Output
(Open Drain)
RST
- Reset Output (Open Drain)
GND - Ground
NC - No Connection
DESCRIPTION
The DS1314 Nonvolatile Controller with Battery Monitor is a CMOS circuit which solves the application
problem of converting CMOS RAM into nonvolatile memory. Incoming power is monitored for an out-
of-tolerance condition. When such a condition is detected, chip enable is inhibited to accomplish write
protection and the battery is switched on to supply the RAM with uninterrupted power. Special circuitry
uses a low-leakage CMOS process which affords precise voltage detection at extremely low battery
consumption.
DS1314
3V Nonvolatile Controller with Lithium Battery Monitor
1
2
3
4
20
19
18
17
5
6
7
8
9
10
11
12
13
14
15
16
NC
V
CCI
RST
NC
NC
BW
NC
CEO
NC
CEI
NC
V
CCO
NC
V
BAT
NC
NC
TOL
NC
NC
GND
DS1314E 20-Pin TSSOP
1
2
3
4
8
7
6
5
GND
TOL
V
BAT
V
CCO
V
CCI
BW
CEO
CEI
DS1314S-2 8-Pin SOIC
(150 mils)
1
2
3
4
8
7
6
5
GND
TOL
V
BAT
V
CCO
V
CCI
BW
CEO
CEI
DS1314 8-Pin DIP
(300 mils)
1
2
3
4
16
15
14
13
5
6
7
8
9
10
11
12
NC
V
CCO
NC
V
BAT
NC
TOL
NC
GND
NC
V
CCI
RST
NC
BW
CEO
NC
CEI
DS1314S 16-Pin SOIC
(300 mils)
19-6307; Rev 6/12