DS1212

更新时间： 2024-01-30 05:31:19

品牌	Logo	应用领域
达拉斯 - DALLAS		光电二极管控制器
页数	文件大小	规格书
7页	88K
描述
Nonvolatile Controller x 16 Chip

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数据手册

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DS1212 数据手册

DS1212

Nonvolatile Controller x 16 Chip

www.dalsemi.com

FEATURES

PIN ASSIGNMENT

ꢀ Converts full CMOS RAM into nonvolatile

memory

VBAT1

VCCO

VCCI

VBAT2

ꢀ Unconditionally write protects when V_CCis

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

TOL

CE0

CE1

CE2

CE3

CE4

CE5

CE6

CE7

CE15

CE14

CE13

CE12

CE11

CE8

CE9

CE10

GND

ꢀ Optional 5% or 10% power-fail detection

ꢀ Optional 28-pin PLCC surface mount

package

28-Pin DIP (600-mil)

See Mech. Drawings Section

ꢀ Optional industrial temperature range of

-40°C to +85°C

27 26

CE0

CE1

CE2

CE3

CE4

CE5

CE6

CE15

CE14

CE13

CE12

CE11

PIN DESCRIPTION

A, B, C, D

- Address Inputs

- Chip Enable

CE0 -CE15

GND

- Chip Enable Outputs

- Ground

12 13

14 15

16 17

V_BAT1

V_BAT2

TOL

- + Battery 1

- + Battery 2

- Power Supply Tolerance

- +5V Supply

28-Pin PLCC

See Mech. Drawings Section

V_CCI

V_CCO

- RAM Supply

- Power Fail

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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