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M48T58YMH Datasheet(PDF) 1 Page - STMicroelectronics

Part # M48T58YMH
Description  64 Kbit 8Kb x8 TIMEKEEPER SRAM
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M48T58YMH Datasheet(HTML) 1 Page - STMicroelectronics

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M48T58
M48T58Y
64 Kbit (8Kb x8) TIMEKEEPER
® SRAM
July 1999
1/17
INTEGRATED ULTRA LOW POWER SRAM,
REAL TIME CLOCK, POWER-FAIL CONTROL
CIRCUIT and BATTERY
BYTEWIDE
™ RAM-LIKE CLOCK ACCESS
BCD CODED YEAR, MONTH, DAY, DATE,
HOURS, MINUTES and SECONDS
FREQUENCY TEST OUTPUT for REAL TIME
CLOCK
AUTOMATIC POWER-FAIL CHIP DESELECT and
WRITE PROTECTION
WRITE PROTECT VOLTAGES
(VPFD = Power-fail Deselect Voltage):
– M48T58: 4.5V
≤ VPFD ≤ 4.75V
– M48T58Y: 4.2V
≤ VPFD ≤ 4.5V
SELF-CONTAINED BATTERY and CRYSTAL
in the CAPHAT DIP PACKAGE
PACKAGING INCLUDES a 28-LEAD SOIC
and SNAPHAT® TOP
(to be Ordered Separately)
SOIC PACKAGE PROVIDES DIRECT
CONNECTION for a SNAPHAT TOP which
CONTAINS the BATTERY and CRYSTAL
PIN and FUNCTION COMPATIBLE with
JEDEC STANDARD 8K x 8 SRAMs
DESCRIPTION
The M48T58/58Y TIMEKEEPER® RAM is an 8K x
8 non-volatile static RAM and real time clock. The
monolithic chip is available in two special packages
to provide a highly integrated battery backed-up
memory and real time clock solution.
AI01374B
13
A0-A12
W
DQ0-DQ7
VCC
M48T58
M48T58Y
G
E2
VSS
8
E1
FT
Figure 1. Logic Diagram
A0-A12
Address Inputs
DQ0-DQ7
Data Inputs / Outputs
FT
Frequency Test Output (Open Drain)
E1
Chip Enable 1
E2
Chip Enable 2
G
Output Enable
W
Write Enable
VCC
Supply Voltage
VSS
Ground
Table 1. Signal Names
28
1
PCDIP28 (PC)
Battery/Crystal
CAPHAT
SNAPHAT (SH)
Battery/Crystal
28
1
SOH28 (MH)


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