M48T18-100PC Ver la hoja de datos (PDF) - STMicroelectronics
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M48T18-100PC Datasheet PDF : 73 Pages
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M48T08
M48T18
CMOS 8K 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:
– M48T08: 4.5V ≤ VPFD ≤ 4.75V
– M48T18: 4.2V ≤ VPFD ≤ 4.5V
SELF CONTAINED BATTERY and CRYSTAL
in the CAPHAT DIP PACKAGE
SMALL OUTLINE PACKAGE PROVIDES
DIRECT CONNECTION for a SNAPHAT
HOUSING CONTAINING the BATTERY and
CRYSTAL
SNAPHAT HOUSING (BATTERY and
CRYSTAL) REPLACEABLE
10 YEARS of DATA RETENTION and CLOCK
OPERATION in the ABSENCE of POWER
PIN and FUNCTION COMPATIBLE with
JEDEC STANDARD 8K x 8 SRAMs
Table 1. Signal Names
A0-A12
Address Inputs
DQ0-DQ7 Data Inputs / Outputs
INT
Power Fail Interrupt
E1
Chip Enable 1
E2
Chip Enable 2
G
Output Enable
W
Write Enable
VCC
Supply Voltage
VSS
Ground
November 1994
28
1
PCDIP28 (PC)
Battery CAPHAT
28
1
SOH28 (MH)
Battery SNAPHAT
Figure 1. Logic Diagram
VCC
13
A0-A12
8
DQ0-DQ7
W
M48T08
E1
M48T18
INT
E2
G
VSS
AI01020
1/18
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