MK41T56N00 STMICROELECTRONICS [STMicroelectronics], MK41T56N00 Datasheet

MK41T56N00

Manufacturer Part Number

MK41T56N00

Description

512 bit 64b x8 Serial Access TIMEKEEPER SRAM

Manufacturer

STMICROELECTRONICS [STMicroelectronics]

Datasheet

1.MK41T56N00.pdf (15 pages)

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DESCRIPTION

The MK41T56 TIMEKEEPER

bit static CMOS RAM organized as 64 words by 8

bits. A built-in 32.768 kHz oscillator (external crystal

controlled) and the first 8 bytes of the RAM are used

for the clock/calendar function and are configured

in binary coded decimal (BCD) format. Addresses

and data are transferred serially via a two-line

bi-directional bus. The built-in address register is

incremented automatically after each write or read

data byte. The MK41T56 clock has a built-in power

sense circuit which detects power failures and

automatically switches to the battery supply during

power failures. The energy needed to sustain the

RAM and clock operations can be supplied from a

small lithium button cell.

Table 1. Signal Names

March 1999

COUNTERS for SECONDS, MINUTES,

HOURS, DAY, DATE, MONTH and YEARS

SOFTWARE CLOCK CALIBRATION

AUTOMATIC POWER-FAIL DETECT and

SWITCH CIRCUITRY

56 BYTES of GENERAL PURPOSE RAM

ULTRA-LOW BATTERY SUPPLY CURRENT of

500nA

OPERATING TEMPERATURE:

– MK41T56: 0 to 70 C

– MKI41T56: –40 to 85°C

AUTOMATIC LEAP YEAR COMPENSATION

OSCI

OCSO

FT/OUT

SDA

SCL

BAT

C BUS COMPATIBLE

Oscillator Input

Oscillator Output

Frequency Test / Output Driver

(Open Drain)

Serial Data Address Input / Output

Serial Clock

Battery Supply Voltage

Supply Voltage

Ground

512 bit (64b x8) Serial Access TIMEKEEPER

is a low power 512

Figure 1. Logic Diagram

OSCI

SCL

0.4mm Frame

PSDIP8 (N)

V CC

V SS

MKI41T56

MK41T56

V BAT

MKI41T56

MK41T56

150mil Width

SO8 (S)

OSCO

SDA

FT/OUT

SRAM

AI02304

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