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MSM6242BGS Datasheet

  • MSM6242BGS

  • Real Time Clock, 1 Timer(s), CMOS, PDSO24, 0.430 INCH, PLAST...

  • 18頁

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隆 Semiconductor
MSM6242B
隆 Semiconductor
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,
MONTH and YEAR. Data access is controlled
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
MSM6242B
DIRECT BUS CONNECTED CMOS REAL TIME CLOCK/CALENDAR
(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
鹵10%
supply at 鈥?0 to 85擄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
23:59:59
MONTH
12
DATE
31
YEAR
80
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
DAY OF WEEK
7
鈥?4-bit data bus
鈥?4-bit address bus
鈥?/div>
READ, WRITE,
ALE and CHIP SELECT
INPUTS
鈥?Status registers 鈥?IRQ and BUSY
鈥?Selectable interrupt outputs 鈥?1/64
second, 1 second, 1 minute, 1 hour
鈥?Interrupt masking
鈥?32.768 KHz crystal controlled operation
12/24 hour format
Auto leap year
鹵30
second error correction
Single 5V supply
Battery backup down to V
DD
= 2.0V
Low power dissipation:
20碌W max at V
DD
= 2V
150碌W max at V
DD
= 5V
鈥?18 pin Plastic DIP (DIP18-P-300)
鈥?24 Pin-V Plastic SOP (SOP24-P-430-VK)
23

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