M48T559 Datasheet

IC型号：
M48T559
PDF描述：
STMicroelectronics [64 Kbit 8Kb x8 TIMEKEEPER SRAM with ADD...
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149.15KB
芯片厂家：
STMICROELECTRONICS

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M48T559Y

64 Kbit (8Kb x8) TIMEKEEPER

庐

SRAM

with ADDRESS/DATA MULTIPLEXED

SOFTWARE and HARDWARE RESET for

WATCHDOG TIMER

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

PFD

= Power-fail Deselect Voltage):

鈥?M48T559Y: 4.2V

鈮?/div>

PFD

鈮?/div>

4.5V

PACKAGING INCLUDES a 28-LEAD SOIC

and SNAPHAT

庐

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

RSTIN1

RSTIN2

WDI

SNAPHAT (SH)

Battery/Crystal

SOH28 (MH)

Figure 1. Logic Diagram

VCC

AD0-AD7

RST

M48T559Y

IRQ/FT

DESCRIPTION

The M48T559Y TIMEKEEPER

庐

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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