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M48T559 Datasheet(PDF) 1 Page - STMicroelectronics

Part # M48T559
Description  64 Kbit 8Kb x8 TIMEKEEPER SRAM with ADDRESS/DATA MULTIPLEXED
PDF  18 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M48T559 Datasheet(HTML) 1 Page - STMicroelectronics

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February 2000
M48T559Y
64 Kbit (8Kb x8) TIMEKEEPER® SRAM
with ADDRESS/DATA MULTIPLEXED
s
SOFTWARE and HARDWARE RESET for
WATCHDOG TIMER
s
REGISTER COMPATIBLE with M48T59
TIMEKEEPER SRAM
s
ADDRESS/DATA MULTIPLEXED I/O PINS
s
WATCHDOG TIMER - MONITORS OUT of
CONTROL PROCESSOR or HUNG BUS
s
ALARM with WAKE-UP in BATTERY MODE
s
INTEGRATED ULTRA LOW POWER SRAM,
REAL TIME CLOCK, POWER-FAIL CONTROL
CIRCUIT and BATTERY
s
FREQUENCY TEST OUTPUT for REAL TIME
CLOCK
s
AUTOMATIC POWER-FAIL CHIP DESELECT
and WRITE PROTECTION
s
WRITE PROTECT VOLTAGE
(VPFD = Power-fail Deselect Voltage):
– M48T559Y: 4.2V
≤ VPFD ≤ 4.5V
s
PACKAGING INCLUDES a 28-LEAD SOIC
and SNAPHAT® TOP
(to be Ordered Separately)
s
SOIC PACKAGE PROVIDES DIRECT
CONNECTION for a SNAPHAT TOP
CONTAINS the BATTERY and CRYSTAL
s
MICROPROCESSOR POWER-ON RESET
(Valid even during battery back-up mode)
s
PROGRAMMABLE ALARM OUTPUT ACTIVE
in the BATTERY BACK-UP MODE
DESCRIPTION
The M48T559Y TIMEKEEPER® RAM is an 8K x 8
non-volatile static RAM and real time clock. The
monolithic chip is available in the SNAPHAT pack-
age to provide a highly integrated battery backed-
up memory and real time clock solution.
The 28 pin 330mil SOIC provides sockets with
gold plated contacts at both ends for direct con-
nection to a separate SNAPHAT housing contain-
ing the battery and crystal. The unique design
allows the SNAPHAT battery package to be
mounted on top of the SOIC package after the
completion of the surface mount process.
Figure 1. Logic Diagram
AI01674B
8
AD0-AD7
W
VCC
M48T559Y
RSTIN2
RSTIN1
VSS
R
E
AS1
AS0
WDI
RST
IRQ/FT
28
1
SOH28 (MH)
SNAPHAT (SH)
Battery/Crystal


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