M48T02 데이터 시트보기 (PDF) - STMicroelectronics
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M48T02 Datasheet PDF : 14 Pages
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M48T02
M48T12
CMOS 2K x 8 TIMEKEEPER SRAM
INTEGRATED ULTRA LOW POWER SRAM,
REAL TIME CLOCK and POWER-FAIL
CONTROL CIRCUIT
BYTEWIDE RAM-LIKE CLOCK ACCESS
BCD CODED YEAR, MONTH, DAY, DATE,
HOURS, MINUTES and SECONDS
CLOCK ACCURACY of ± 1 MINUTE a
MONTH, @ 25°C
SOFTWARE CONTROLLED CLOCK
CALIBRATION for HIGH ACCURACY
APPLICATIONS
AUTOMATICPOWER-FAIL CHIP DESELECTand
WRITE PROTECTION
CHOICE of TWO WRITE PROTECT
VOLTAGES:
– M48T02: 4.5V ≤ VPFD ≤ 4.75V
– M48T12: 4.2V ≤ VPFD ≤ 4.5V
SELF CONTAINED BATTERY and CRYSTAL
in the CAPHAT DIP PACKAGE
10 YEARS of DATA RETENTION and CLOCK
OPERATION in the ABSENCE of POWER
PIN and FUNCTION COMPATIBLE with
JEDEC STANDARD 2K x 8 SRAMs
DESCRIPTION
The M48T02,12 TIMEKEEPER™ RAM is a 2K x 8
non-volatile static RAM and real time clock which
is pin and functional compatible with the
MK48T02,12.
Table 1. Signal Names
A0-A10
Address Inputs
DQ0-DQ7 Data Inputs / Outputs
E
Chip Enable
G
Output Enable
W
Write Enable
VCC
Supply Voltage
VSS
Ground
24
1
PCDIP24 (PC)
Battery CAPHAT
Figure 1. Logic Diagram
VCC
11
A0-A10
8
DQ0-DQ7
W
M48T02
M48T12
E
G
VSS
AI01027
December 1994
1/14
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