19-6294; Rev 6/12
Nonvolatile Controller Chip
FEATURES
Converts CMOS RAMs into Nonvolatile
Memories
Unconditionally Write Protects when V
CC
is
Out-of-Tolerance
Automatically Switches to Battery when
Power-Fail Occurs
Space-Saving 8-Pin PDIP or 16-Pin SO
Packages
Consumes <100nA of Battery Current
Tests Battery Condition on Power up
Provides for Redundant Batteries
Optional 5% or 10% Power-Fail Detection
Low Forward Voltage Drop on the V
CC
Switch
Optional Industrial (N) Temperature Range of
-40°C to +85°C
PIN ASSIGNMENT
VCCO
VBAT1
TOL
GND
1
2
3
4
8
7
6
5
VCCI
VBAT2
CEO
CE
NC
VCCO
NC
VBAT1
NC
TOL
NC
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
NC
VCCI
NC
VBAT2
NC
CEO
NC
CE
PIN DESCRIPTION
V
CCO
V
BAT1
TOL
GND
CE
CEO
V
BAT2
V
CCI
NC
- RAM Supply
- + Battery 1
- Power Supply Tolerance
- Ground
- Chip Enable Input
- Chip Enable Output
- + Battery 2
- + Supply
- No Connect
DESCRIPTION
The DS1210 Nonvolatile Controller Chip 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.
The 8-pin DIP package keeps PC board real estate requirements to a minimum. By combining the
can be achieved.
1 of
8
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