DS1211 [DALLAS]
Nonvolatile Controller x 8 Chip; 非易失性控制器×8片
| 型号： | DS1211 |
| 厂家： | 
DALLAS SEMICONDUCTOR |
| 描述： | Nonvolatile Controller x 8 Chip |
| 文件： | 总1页 (文件大小：17K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DS1211
Nonvolatile Controller x 8 Chip
www.dalsemi.com
FEATURES
PIN ASSIGNMENT
ꢀ Converts full CMOS RAMs into nonvolatile
memories
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
VBAT1
VCCI
VBAT2
CE
VCCO
ꢀ Unconditionally write protects when VCC is
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
TOL
PF
CE0
VBAT1
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
VCCI
VBAT2
CE
CE1
CE2
CE7
CE6
VCCO
TOL
PF
CE0
CE1
CE2
CE3
NC
C
B
CE3
NC
CE7
CE6
C
A
CE4
CE5
B
A
CE4
CE5
GND
GND
20-Pin DIP (300-mil)
See Mech. Drawings
Section
20-Pin SOIC (300-mil)
See Mech. Drawings
Section
PIN DESCRIPTION
A, B, C
- Address Inputs
- Chip Enable Input
CE
CE0 - CE7
GND
- Chip Enable Outputs
- Ground
VBAT1
VBAT2
TOL
- + Battery 1
- + Battery 2
- Power Supply Tolerance
- +5V Supply
VCCI
VCC0
- 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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