m48t39y STMicroelectronics, m48t39y Datasheet

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m48t39y

Manufacturer Part Number
m48t39y
Description
256 Kb 32k X8 Timekeeper Sram
Manufacturer
STMicroelectronics
Datasheet
DESCRIPTION
The M48T39Y TIMEKEEPER
atile 262,144 bit static RAM and real time clock or-
ganized as 32,768 words by 8 bits. System
integration
Alarms, Watchdog Timer and Interval Timer. The
special 32-pin DIP package provides a highly inte-
grated battery back-up memory and real time
clock solution.
January 1998
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
INTEGRATED ULTRA LOW POWER SRAM,
REAL TIME CLOCK, POWER-FAIL CONTROL
CIRCUIT, BATTERY and CRYSTAL
BCD CODED YEAR, MONTH, DAY, DATE,
HOURS, MINUTES and SECONDS
AUTOMATIC POWER-FAIL CHIP DESELECT
and WRITE PROTECTION
WRITE PROTECT VOLTAGE
(V
– M48T39Y: 4.20V
PROGRAMMABLE INTERRUPTS and
SQUARE WAVE OUTPUT
WATCHDOG TIMER RESTARTS on
OUT-OF-CONTROL PROCESSOR
CLOCK ACCURACY IS BETTER THAN
±1 MINUTE per MONTH at 25° C
10 YEARS of DATA RETENTION and CLOCK
OPERATION in the ABSENCE of POWER
SELF-CONTAINED BATTERY and CRYSTAL
in DIP PACKAGE
PROGRAMMABLE ALARM OUTPUT ACTIVE
in the BATTERY BACK-UP MODE
PIN and FUNCTION COMPATIBLE with
DS1386
PFD
= Power-fail Deselect Voltage):
features
V
include
PFD
®
RAM is a non-vol-
4.50V
Programmable
256 Kb (32K x8) TIMEKEEPER
Figure 1. Logic Diagram
A0-A14
W
G
E
15
32
PMDIP32 (PM)
V CC
M48Z129Y
V SS
1
Module
M48T39Y
PRELIMINARY DATA
8
®
DQ0-DQ7
INTA
INTB
SQW
SRAM
AI02311
1/4

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m48t39y Summary of contents

Page 1

... BCD CODED YEAR, MONTH, DAY, DATE, HOURS, MINUTES and SECONDS AUTOMATIC POWER-FAIL CHIP DESELECT and WRITE PROTECTION WRITE PROTECT VOLTAGE (V = Power-fail Deselect Voltage): PFD – M48T39Y: 4.20V V 4.50V PFD PROGRAMMABLE INTERRUPTS and SQUARE WAVE OUTPUT WATCHDOG TIMER RESTARTS on OUT-OF-CONTROL PROCESSOR CLOCK ACCURACY IS BETTER THAN ± ...

Page 2

... INTB A10 E SQW DQ7 V CC DQ6 DQ5 V SS DQ4 DQ3 M48T39Y -100 PM 1 Address Inputs Data Inputs / Outputs Chip Enable Input Output Enable Input Write Enable Input Interrupt Output A (Open Drain) Interrupt Output B (Open Drain) Square Wave Output Supply Voltage Ground ...

Page 3

... Figure 3. PMDIP32 - 32 pin Plastic Module DIP, Package Outline Drawing is not to scale. mm Min Max Typ 9.27 9.52 0.38 – 0.43 0.59 0.20 0.33 42.42 43.18 18.03 18.80 2.29 2.79 34.29 41.91 14.99 16.00 3.05 3.81 1.91 2. M48T39Y inches Min Max 0.3650 0.3748 0.0150 – 0.0169 0.0232 0.0079 0.0130 1.6701 1.7000 0.7098 0.7402 0.0902 0.1098 1.3500 1.6500 0.5902 0.6299 0.1201 0.1500 0.0752 0.1098 C eA PMDIP 3/4 ...

Page 4

... M48T39Y Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice ...

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