M48T08-150PC View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
M48T08-150PC Datasheet PDF : 73 Pages
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MK41T56
CMOS 64 x 8 SERIAL ACCESS TIMEKEEPER SRAM
COUNTERS for SECONDS, MINUTES,
HOURS, DAY, DATE, MONTH and YEARS
SOFTWARE CLOCK CALIBRATION
AUTOMATIC POWER FAIL DETECT and
SWITCH CIRCUITRY
I2C BUS COMPATIBLE
56 BYTES of GENERAL PURPOSE RAM
ULTRA-LOW BATTERY SUPPLY CURRENT of
500nA
AVAILABLE with an OPERATING
TEMPERATURE of –40 to 85°C
AUTOMATIC LEAP YEAR COMPENSATION
8
1
PSDIP8 (N)
0.4mm Frame
8
1
SO8 (S)
0.15mm Frame
DESCRIPTION
The MK41T56 TIMEKEEPER™ RAM is a low
power 512 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 BCD format. Addresses and
data are transferred serially via a two-line bi-direc-
tional bus. The built-in address register is incre-
mented automatically after each write or read data
byte. The MK41T56 clock has a built-in power
sense circuit which detects power failures and
automaticallyswitches 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
OSCI
Oscillator Input
OCSO
Oscillator Output
FT/OUT
Frequency Test / Output Driver
SDA
SCL
Serial Data Address Input / Output
Serial Clock
VBAT
VCC
VSS
Battery Supply Voltage
Supply Voltage
Ground
Figure 1. Logic Diagram
VCC VBAT
OSCI
SCL
MK41T56
VSS
November 1994
OSCO
SDA
FT/OUT
AI01061
1/14
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