Datasheet > DS1644LPM

DS1644LPM

更新时间： 2024-11-18 22:16:19

品牌	Logo	应用领域
达拉斯 - DALLAS		时钟
页数	文件大小	规格书
11页	110K
描述
Nonvolatile Timekeeping RAM

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中文翻译

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数据手册

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DS1644LPM 数据手册

DS1644LPM

Nonvolatile Timekeeping RAM

FEATURES

PIN ASSIGNMENT

• Upward compatible with the DS1643AL Timekeeping

A14

A13

A12

A11

A10

RAM to achieve higher RAM density

• Integrated NV SRAM, real time clock, crystal, power–

fail control circuit and lithium energy source

PFO

• Low profile socketable module

DQ7

DQ6

DQ5

DQ4

DQ3

DQ2

DQ1

DQ0

GND

–

255 mil package height

• Clock registers are accessed identical to the static

RAM. These registers are resident in the eight top

RAM locations.

• Totally nonvolatile with over 10 years of operation in

the absence of power

34–PIN LOW PROFILE MODULE

• Access time of 120 ns and 150 ns

• Quartz accuracy ±1 minute a month @ 25°C, factory

PIN DESCRIPTION

calibrated

A0–A14

–

Address Input

Chip Enable

Output Enable

Write Enable

+5 Volts

• BCD coded year, month, date, day, hours, minutes,

and seconds with leap year compensation valid up to

2100

GND

Ground

• Power–fail write protection allows for ±10% V pow-

DQ0-DQ7

PFO

Data Input/Output

No Connection

Power Fail Output

er supply tolerance

ORDERING INFORMATION

DS1644L–XXX Low Profile Module

–120 120 ns access

–150 150 ns access

DESCRIPTION

The DS1644L is a low profile module that requires a

PLCC surface mountable socket and is functionally

equivalent to the DS1644. The DS1644L is a 32K x 8

nonvolatilestatic RAM with a full function real time clock

which are both accessible in a Byte–wide format. The

real time clock information resides in the eight upper-

most RAM locations. The RTC registers contain year,

month, date, day, hours, minutes, and seconds data in

24 hour BCD format. Corrections for the day of the

month and leap year are made automatically. The RTC

clockregistersaredoublebufferedtoavoidaccessofin-

correct data that can occur during clock update cycles.

The double buffered system also prevents time loss as

the timekeeping countdown continues unabated by ac-

cess to time register data. The DS1644L also contains

its own power–fail circuitry which deselects the device

when the V

supply is in an out–of–tolerance condi-

tion. This feature prevents loss of data from unpredict-

able system operation brought on by low V as errant

access and update cycles are avoided.

patents and other intellectual property rights, please refer to

Dallas Semiconductor data books.

041697 1/11

12 3 4 5 6 7...11

中文翻译

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与DS1644LPM相关器件

型号	品牌	获取价格	描述	数据表
DS1644P	DALLAS	获取价格	Nonvolatile Timekeeping RAM
DS1644P	MAXIM	获取价格	Nonvolatile Timekeeping RAM
DS1644P+120	DALLAS	获取价格	Nonvolatile Timekeeping RAM
DS1644P-120	DALLAS	获取价格	Nonvolatile Timekeeping RAM
DS1644P120+	DALLAS	获取价格	Nonvolatile Timekeeping RAM
DS1644P-120+	MAXIM	获取价格	Nonvolatile Timekeeping RAM
DS1644P-150	DALLAS	获取价格	Real Time Clock, Non-Volatile, 0 Timer(s), CMOS, POWERCAP MODULE BOARD-34
DS1645AB100	ETC	获取价格	IC-1M CMOS NVRAM
DS1645AB-100	DALLAS	获取价格	Non-Volatile SRAM Module, 128KX8, 100ns, CMOS,
DS1645AB-100-IND	ETC	获取价格	NVRAM (Battery Based)

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