ds1211st-r Maxim Integrated Products, Inc., ds1211st-r Datasheet
ds1211st-r
Manufacturer Part Number
ds1211st-r
Description
Ds1211 Nonvolatile Controller X 8 Chip
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.DS1211ST-R.pdf
(1 pages)
FEATURES
DESCRIPTION
The DS1211 Nonvolatile Controller x 8 Chip is a CMOS circuit which solves the application problem of
converting CMOS RAMs into nonvolatile memories. Incoming power is monitored for an out-of-
tolerance condition. When such a condition is detected, the chip enables are inhibited to accomplish write
protection and the battery is switched on to supply RAMs with uninterrupted power. Special circuitry
uses a low-leakage CMOS process which affords precise voltage detection at extremely low battery
consumption.
By combining the DS1211 nonvolatile controller/decoder chip and lithium batteries, nonvolatile RAM
operation can be achieved for up to eight CMOS memories.
See the data sheet for the DS1212 Nonvolatile Controller x 16 Chip for electrical specifications and
operation.
www.dalsemi.com
Converts full CMOS RAMs into nonvolatile
memories
Unconditionally write protects when V
out of tolerance
Automatically switches to battery when
power-fail occurs
3 to 8 decoder provides control for up to eight
CMOS RAMs
Consumes less than 100 nA of battery current
Tests battery condition on power-up
Provides for redundant batteries
Power-fail signal can be used to interrupt
processor on power failure
Optional 5% or 10% power-fail detection
Optional 20-pin SOIC surface mount package
Optional industrial temperature range of
-40°C to +85°C
CC
is
1 of 1
Nonvolatile Controller x 8 Chip
VBAT1
VCCO
GND
CE7
CE6
TOL
PF
C
B
A
PIN ASSIGNMENT
PIN DESCRIPTION
A, B, C
GND
V
V
TOL
V
V
NC
CE
CE0
PF
See Mech. Drawings
20-Pin DIP (300-mil)
BAT1
BAT2
CCI
CC0
1
10
2
3
6
7
8
9
-
4
5
CE7
Section
20
19
18
17
16
15
14
13
12
11
VCCI
VBAT2
CE
CE0
CE1
CE2
CE3
NC
CE4
CE5
- Address Inputs
- Chip Enable Input
- Chip Enable Outputs
- Ground
- + Battery 1
- + Battery 2
- Power Supply Tolerance
- +5V Supply
- RAM Supply
- Power-fail
- No Connection
VBAT1
VCCO
GND
CE7
CE6
TOL
PF
C
B
A
20-Pin SOIC (300-mil)
See Mech. Drawings
1
10
2
3
4
5
6
7
8
9
Section
DS1211
19
18
17
16
15
14
13
20
12
11
111899
VCCI
VBAT2
CE
CE0
CE1
CE2
CE3
NC
CE4
CE5
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