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PDF DS1212 Data sheet ( Hoja de datos )
| Número de pieza | DS1212 | |
| Descripción | Nonvolatile Controller x 16 Chip | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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DS1212
Nonvolatile Controller x 16 Chip
FEATURES
Converts full CMOS RAM into nonvolatile
memory
Unconditionally write protects when VCC is
out of tolerance
Automatically switches to battery when
power-fail occurs
4 to 16 decoder provides control for up to 16
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 28-pin PLCC surface mount
package
Optional industrial temperature range of
-40°C to +85°C
PIN DESCRIPTION
A, B, C, D
- Address Inputs
CE - Chip Enable
CE0 - CE15
GND
VBAT1
VBAT2
TOL
VCCI
VCCO
PF
- Chip Enable Outputs
- Ground
- + Battery 1
- + Battery 2
- Power Supply Tolerance
- +5V Supply
- RAM Supply
- Power Fail
PIN ASSIGNMENT
VBAT1
VCCO
TOL
PF
CE15
CE14
CE13
CE12
CE11
D
C
B
1
2
3
4
5
6
7
8
9
10
11
12
28 VCCI
27 VBAT2
26 CE
25 CE0
24 CE1
23 CE2
22 CE3
21 CE4
20 CE5
19 CE6
18 CE7
17 CE8
A
GND
13
14
16 CE9
15 CE10
28-Pin DIP (600-mil)
See Mech. Drawings Section
CE15
CE14
CE13
CE12
CE11
D
C
4
5
3
6
7
8
9
10
11
12 13
2 1 28 27 26
25
24
23
22
21
20
19
14 15 16 17 18
CE0
CE1
CE2
CE3
CE4
CE5
CE6
28-Pin PLCC
See Mech. Drawings Section
DESCRIPTION
The DS1212 Nonvolatile Controller x16 Chip is a CMOS circuit that 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 the RAMs with uninterrupted power. Special circuitry
uses a low-leakage CMOS process that affords precise voltage detection at extremely low battery
consumption.
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CAPACITANCE
PARAMETER
Input Capacitance
Output Capacitance
SYMBOL
CIN
COUT
MIN
TYP
MAX
5
7
DS1212
(TA = 25°C)
UNITS NOTES
pF
pF
(0°C to 70°C; VCCI = 4.75 to 5.5V, PIN 3 = GND)
(0°C to 70°C; VCCI = 4.5 to 5.5V, PIN 3 = VCCO)
AC ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL MIN
TYP MAX UNITS NOTES
CE Propagation Delay
tPD
5
10 20
ns
5
CE High to Power-Fail
tPF
0 ns
Address Setup
tAS 20
ns 9
PARAMETER
Recovery at Power-Up
VCC Slew Rate Power-Down
VCC Slew Rate Power-Down
VCC Slew Rate Power-Up
CE Pulse Width
Power Fail to PF Low
SYMBOL
tREC
tF
tFB
tR
tCE
tPFL
(0°C to 70°C; VCCI < 4.75V, PIN 3 = GND)
(0°C to 70°C; VCCI < 4.5V, PIN 3 = VCCO)
MIN
TYP MAX UNITS NOTES
2 80 125 ms
300 µs
10 µs
0 µs
1.5 µs 7, 8
300 µs
5 of 7
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet DS1212.PDF ] | |
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