DS1557

更新时间： 2024-11-16 22:50:47

品牌	Logo	应用领域
达拉斯 - DALLAS		时钟
页数	文件大小	规格书
19页	270K
描述
4MEG NV Y2KC Timekeeping RAM

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中文翻译

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数据手册

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DS1557 数据手册

PRELIMINARY

DS1557

4MEG NV Y2KC Timekeeping RAM

www.dalsemi.com

FEATURES

PIN ASSIGNMENT

ꢀ

Integrated NV SRAM, real time clock, crystal,

power-fail control circuit and lithium energy

source

Clock registers are accessed identically to the

static RAM; these registers are resident in the

16 top RAM locations

Century byte register; i.e., Y2K complaint

Totally nonvolatile with over 10 years of

operation in the absence of power

A18

A17

A14

A13

A12

A11

A10

IRQ/FT

A15

A16

RST

V_CC

ꢀ

DQ7

DQ6

DQ5

DQ4

DQ3

ꢀ

Precision power-on reset

DQ2

DQ1

DQ0

GND

Programmable watchdog timer and RTC alarm

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

minutes, and seconds with automatic leap year

compensation valid up to the year 2100

Battery voltage level indicator flag

Power-fail write protection allows for ±10%

V_BATX2

X1 GND

34-Pin POWERCAP MODULE BOARD

(USES DS9034PCX POWERCAP)

ꢀ

PIN DESCRIPTION

V_CCpower supply tolerance

A0-A14

DQ0-DQ7

IRQ \FT

- Address Input

- Data Input/Outputs

ꢀ

Lithium energy source is electrically

disconnected to retain freshness until power is

applied for the first time

- Interrupt, Frequency Test

Output (Open Drain)

RST

- Power-On Reset Output

(Open Drain)

ORDERING INFORMATION

DS1557P-XXX

(5-Volt)

-70

70 ns access

- Chip Enable

- Output Enable

-100 100 ns access

*DS1557WP-XXX (3.3 Volt)

-120 120 ns access

-150 150 ns access

*DS9034PCX (PowerCap) Required:

must be ordered seperately

- Write Enable

- Power Supply Input

- Ground

- No Connection

- Crystal Connection

- Battery Connection

V_CC

GND

X1, X2

V_BAT

DESCRIPTION

The DS1557 is a full function, year 2000-compliant (Y2KC), real-time clock/calendar (RTC) with a RTC

alarm, watchdog timer, power-on reset, battery monitor, and 512k x 8 non-volatile static RAM. User

access to all registers within the DS1557 is accomplished with a bytewide interface as shown in Figure 1.

The RTC Registers contain century, year, month, date, day, hours, minutes, and seconds data in 24-hour

BCD format. Corrections for day of month and leap year are made automatically.

1of 19

012700

12 3 4 5 6 7...19

中文翻译

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与DS1557相关器件

型号	品牌	获取价格	描述	数据表
DS1557P	DALLAS	获取价格	Real Time Clock, CMOS, POWERCAP MODULE-34
DS1557P/YP/WP	MAXIM	获取价格	PowerCap with Crystal
DS1557P-100	DALLAS	获取价格	4MEG NV Y2KC Timekeeping RAM
DS1557P-70	DALLAS	获取价格	4MEG NV Y2KC Timekeeping RAM
DS1557P-70	ROCHESTER	获取价格	0 TIMER(S), REAL TIME CLOCK, DMA34, POWERCAP MODULE-34
DS1557P-70+	MAXIM	获取价格	Real Time Clock, Non-Volatile, CMOS, ROHS COMPLIANT, POWERCAP MODULE-34
DS1557P-70IND	ROCHESTER	获取价格	REAL TIME CLOCK, DMA34, POWERCAP MODULE-34
DS1557P-70IND	MAXIM	获取价格	Real Time Clock, Non-Volatile, CMOS, POWERCAP MODULE-34
DS1557WP	MAXIM	获取价格	Real Time Clock, CMOS, POWERCAP MODULE-34
DS1557WP-120	ROCHESTER	获取价格	0 TIMER(S), REAL TIME CLOCK, DMA34, POWERCAP MODULE-34

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