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M6242B PDF预览

M6242B

更新时间： 2022-11-24 21:44:06

品牌	Logo	应用领域
冲电气 - OKI		时钟
页数	文件大小	规格书
18页	177K
描述
DIRECT BUS CONNECTED CMOS REAL TIME CLOCK/CALENDAR

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M6242B 数据手册

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¡ Semiconductor

MSM6242B

¡ Semiconductor

MSM6242B

DIRECT BUS CONNECTED CMOS REAL TIME CLOCK/CALENDAR

DESCRIPTION

The MSM6242B is a silicon gate CMOS Real

Time Clock/Calendar for use in direct bus-

connection Microprocessor/Microcomputer

applications. An on-chip 32.768 KHz crystal

oscillator time base is divided to provide ad-

dressable 4-bit I/O data for SECONDS,

MINUTES, HOURS, DAY OF WEEK, DATE,

MONTHandYEAR. Dataaccessiscontrolled

by 4-bit address, chip selects (CSO, CS1),

WRITE, READ, and ALE. Control Registers

D, E and F provide for 30 SECOND error

adjustment, INTERRUPT REQUEST (IRQ

FLAG) and BUSY status bits, clock STOP,

HOLD, and RESET FLAG bits, 4 selectable

INTERRUPTS rates are available at the STD.P

(STANDARD PULSE) output utilizing Con-

trol Register inputs T0, T1 and the ITRPT/

STND (INTERRUPT/STANDARD). Mask-

ing of the interrupt output (STD.P) can be

accomplished via the MASK bit. The

MSM6242B can operate in a 12/24 hour for-

mat and Leap Year timing is automatic.

The MSM6242B normally operates from a 5V

±10% supply at –40 to 85°C. Battery backup

operation down to 2.0V allows continuation

of time keeping when main power is off. The

MSM6242B is offered in a 18-pin plastic DIP

and a 24-pin plastic Small Outline package.

FEATURES

DIRECT MICROPROCESSOR/MICROCONTROLLER BUS CONNECTION

TIME

MONTH

12

DATE

31

YEAR

80

DAY OF WEEK

7

23:59:59

•

•

•

4-bit data bus

4-bit address bus

READ, WRITE, ALE and CHIP SELECT

INPUTS

Status registers – IRQ and BUSY

Selectable interrupt outputs – 1/64

second, 1 second, 1 minute, 1 hour

Interrupt masking

•

•

•

•

•

•

12/24 hour format

Auto leap year

±30 second error correction

Single 5V supply

Battery backup down to V_DD= 2.0V

Low power dissipation:

20µW max at V_DD= 2V

150µW max at V_DD= 5V

18 pin Plastic DIP (DIP18-P-300)

24 Pin-V Plastic SOP (SOP24-P-430-VK)

•

•

•

•

32.768 KHz crystal controlled operation

•

•

23

12 3 4 5 6 7...18

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