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PDF DS1211 Data sheet ( Hoja de datos )
| Número de pieza | DS1211 | |
| Descripción | Nonvolatile Controller x 8 Chip | |
| Fabricantes | Dallas Semiconducotr | |
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DS1211
Nonvolatile Controller x 8 Chip
FEATURES
PIN ASSIGNMENT
Converts full CMOS RAMs into nonvolatile VBAT1 1
memories
20 VCCI
Unconditionally write protects when VCC is VCCO
out of tolerance
Automatically switches to battery when
power-fail occurs
TOL
PF
3 to 8 decoder provides control for up to eight CE7
CMOS RAMs
CE6
Consumes less than 100 nA of battery current
Tests battery condition on power-up
C
2
3
4
5
6
7
19 VBAT2
18 CE
17 CE0
VBAT1
16 CE1
VCCO
15 CE2 TOL
PF
14 CE3 CE7
1
2
3
4
5
20 VCCI
19 VBAT2
18 CE
17 CE0
16 CE1
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
B
A
GND
8
9
10
13 NC CE6
C
12 CE4
B
A
11 CE5 GND
6
7
8
9
10
15 CE2
14 CE3
13 NC
12 CE4
11 CE5
20-Pin DIP (300-mil)
See Mech. Drawings
Section
PIN DESCRIPTION
20-Pin SOIC (300-mil)
See Mech. Drawings
Section
A, B, C
- Address Inputs
CE - Chip Enable Input
CE0 - CE7
GND
VBAT1
VBAT2
TOL
VCCI
VCC0
- Chip Enable Outputs
- Ground
- + Battery 1
- + Battery 2
- Power Supply Tolerance
- +5V Supply
- RAM Supply
PF - Power-fail
NC - No Connection
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.
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