DS1323 データシートの表示（PDF） - Maxim Integrated

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DS1323

3.3V Flexible Nonvolatile Controller with Lithium Battery Monitor

Maxim Integrated 

19-5920; Rev 5/12

DS1323

3.3V Flexible Nonvolatile Controller with

Lithium Battery Monitor

FEATURES

 Converts CMOS SRAM into nonvolatile

memory

 Unconditionally write-protects SRAM when

VCC is out of tolerance

 Automatically switches to battery backup

when VCC power failure occurs

 Flexible memory organization

- Mode 0: 4 banks with 1 SRAM each

- Mode 1: 2 banks with 2 SRAMs each

- Mode 2: 1 bank with 4 SRAMs each

 Monitors voltage of a lithium cell and

provides advanced warning of impending

battery failure

 Signals low-battery condition on active low

battery warning output signal

 Resets processor when power failure occurs

and holds processor in reset during system

power-up

 10% power-fail detection

 Industrial temperature range of -40°C to

+85°C

PIN ASSIGNMENT

VCCO

1

VBAT

2

NC 3

CEI1 4

CEI2 5

NC 6

A/CEI3 7

B/CEI4 8

NC 9

GND 10

20

VCCI

19 RST

18 BW

17 CEO1

16 CEO2

15 NC

14 CEO3

13 CEO4

12 NC

11 MODE

DS1323E 20-Pin TSSOP

(173 mils)

PIN DESCRIPTION

VCCI

VCCO

VBAT

A, B

- +3.3V Power Supply Input

- SRAM Power Supply Output

- Backup Battery Input

- Address Inputs

CEI1 - CEI4 - Chip Enable Inputs

CEO1 - CEO4 - Chip Enable Outputs

BW

- Battery Warning Output (Open

Drain)

RST

- Reset Output (Open Drain)

MODE

- Mode Input

GND

- Ground

NC

- No Connection

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