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M48T559 Datasheet

  • M48T559

  • STMicroelectronics [64 Kbit 8Kb x8 TIMEKEEPER SRAM with ADD...

  • 149.15KB

  • STMICROELECTRONICS   STMICROELECTRONICS

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M48T559Y
64 Kbit (8Kb x8) TIMEKEEPER
廬
SRAM
with ADDRESS/DATA MULTIPLEXED
s
SOFTWARE and HARDWARE RESET for
WATCHDOG TIMER
REGISTER COMPATIBLE with M48T59
TIMEKEEPER SRAM
ADDRESS/DATA MULTIPLEXED I/O PINS
WATCHDOG TIMER - MONITORS OUT of
CONTROL PROCESSOR or HUNG BUS
ALARM with WAKE-UP in BATTERY MODE
INTEGRATED ULTRA LOW POWER SRAM,
REAL TIME CLOCK, POWER-FAIL CONTROL
CIRCUIT and BATTERY
FREQUENCY TEST OUTPUT for REAL TIME
CLOCK
AUTOMATIC POWER-FAIL CHIP DESELECT
and WRITE PROTECTION
WRITE PROTECT VOLTAGE
(V
PFD
= Power-fail Deselect Voltage):
鈥?M48T559Y: 4.2V
鈮?/div>
V
PFD
鈮?/div>
4.5V
PACKAGING INCLUDES a 28-LEAD SOIC
and SNAPHAT
廬
TOP
(to be Ordered Separately)
SOIC PACKAGE PROVIDES DIRECT
CONNECTION for a SNAPHAT TOP
CONTAINS the BATTERY and CRYSTAL
MICROPROCESSOR POWER-ON RESET
(Valid even during battery back-up mode)
PROGRAMMABLE ALARM OUTPUT ACTIVE
in the BATTERY BACK-UP MODE
AS0
AS1
W
R
RSTIN1
RSTIN2
E
WDI
28
s
SNAPHAT (SH)
Battery/Crystal
s
s
s
s
1
s
SOH28 (MH)
s
s
Figure 1. Logic Diagram
s
VCC
8
AD0-AD7
RST
M48T559Y
IRQ/FT
s
s
s
DESCRIPTION
The M48T559Y TIMEKEEPER
廬
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.
February 2000
VSS
AI01674B
1/18

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