DS1210 Maxim, DS1210 Datasheet

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DS1210

Manufacturer Part Number
DS1210
Description
The DS1210 Nonvolatile Controller Chip is a CMOS circuit which solves the application problem of converting CMOS RAM into nonvolatile memory
Manufacturer
Maxim
Datasheet

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FEATURES
§ Converts CMOS RAMs into Nonvolatile
§ Unconditionally Write Protects when V
§ Automatically Switches to Battery when
§ Space-Saving 8-Pin DIP
§ 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
§ Optional 16-Pin SOIC Surface Mount
§ Optional Industrial (N) Temperature Range of
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
DS1210 Nonvolatile Controller Chip with a CMOS memory and batteries, nonvolatile RAM operation
can be achieved.
www.maxim-ic.com
Memories
Out-of-Tolerance
Power-Fail Occurs
Switch
Package
-40°C to +85°C
CC
CC
is
1 of 6
PIN ASSIGNMENT
PIN DESCRIPTION
V
V
TOL
GND
V
V
NC
CE
CEO
CCO
BAT1
BAT2
CCI
Nonvolatile Controller Chip
VBAT1
VCCO
GND
TOL
NC
NC
NC
NC
DS1210S 16-pin SOIC (300-mil)
VBAT1
VCCO
See Mech. Drawings Section
GND
See Mech. Drawings Section
TOL
DS1210 8-pin DIP (300-mil)
1
2
3
5
6
7
8
4
1
2
3
4
- RAM Supply
- + Battery 1
- Power Supply Tolerance
- Ground
- Chip Enable Input
- Chip Enable Output
- + Battery 2
- + Supply
- No Connect
16
15
14
13
12
11
10
8
7
6
5
9
VCCI
VBAT2
CEO
CE
NC
VCCI
NC
VBAT2
NC
CEO
NC
CE
DS1210
090503

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DS1210 Summary of contents

Page 1

... 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 ...

Page 2

... Figure 1 shows a typical application incorporating the DS1210 in a microprocessor-based system. Section A shows the connections necessary to write protect the RAM when V up the supply with batteries. Section B shows the use of the DS1210 to halt the processor when V less than 4.75 volts and to delay its restart on power-up to prevent spurious writes. ...

Page 3

... SECTION A - BATTERY BACKUP Figure 1 BATTERY BACKUP CURRENT DRAIN EXAMPLE CONSUMPTION DS1210 I 100 nA BAT 10 mA RAM I CC02 10.1 mA Total Drain SECTION B - PROCESSOR RESET ...

Page 4

... Soldering Temperature * This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. RECOMMENDED DC OPERATING CONDITIONS PARAMETER ...

Page 5

... DS1210 can supply to the memories. CC01 5. Measured with a load as shown in Figure the maximum average load current which the DS1210 can supply to the memories in the CC02 battery backup mode max. must be met to ensure data integrity on power loss. ...

Page 6

TIMING DIAGRAM: POWER-UP TIMING DIAGRAM: POWER-DOWN OUTPUT LOAD Figure ...

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