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M48T39Y
256Kb (32K x 8) TIMEKEEPER(R) SRAM
PRELIMINARY DATA
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 (VPFD = Power-fail Deselect Voltage): - M48T39Y: 4.20V VPFD 4.50V 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
32 1
PMDIP32 (PM) Module
Logic Diagram
VCC
DESCRIPTION The M48T39Y TIMEKEEPER(R) RAM is a non-volatile 262,144 bit static RAM and real time clock organized as 32,768 words by 8 bits. System integration features include Programmable Alarms, Watchdog Timer and Interval Timer. The special 32-pin DIP package provides a highly integrated battery back-up memory and real time clock solution.
15 A0-A14
8 DQ0-DQ7
W E G
M48Z129Y
INTA INTB SQW
VSS
AI02311
January 1998
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
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M48T39Y
DIP Pin Connections Ordering Information Scheme For a list of available options or for further information on any aspect of this device, please contact the SGS-THOMSON Sales Office nearest to you. Example: M48T39Y -100 PM 1
INTA INTB A14 A12 A7 A6 A5 A4 A3 A2 A1 A0 DQ0 DQ1 DQ2 VSS
32 1 31 2 30 3 29 4 28 5 27 6 26 7 25 8 M48T39Y 24 9 23 10 22 11 21 12 20 13 19 14 18 15 17 16
AI02312
VCC SQW VCC W A13 A8 A9 A11 G A10 E DQ7 DQ6 DQ5 DQ4 DQ3
Supply Voltage and Write Protect Voltage 39Y VCC = 4.50V to 5.50V VPFD = 4.20V to 4.50V
Speed -100 -150 100ns 150ns
Package PM PMDIP32
Temperature Range 1 0 to 70 C
Signal Names
A0-A14 DQ0-DQ7 E G W INTA INTB SQW VCC VSS 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
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M48T39Y
PMDIP32 - 32 pin Plastic DIP Module
Symb Typ A A1 B C D E e1 e3 eA L S N
PMDIP32
mm Min 9.27 0.38 0.43 0.20 42.42 18.03 2.30 34.43 14.99 3.05 1.91 32 Max 9.52 - 0.59 0.33 43.18 18.80 2.81 42.08 16.00 3.81 2.79 Typ
inches Min 0.365 0.015 0.017 0.008 1.670 0.710 0.090 1.355 0.590 0.120 0.075 32 Max 0.375 - 0.023 0.013 1.700 0.740 0.110 1.656 0.630 0.150 0.110
A
A1 S B e3 D e1
L eA
C
N
E
1 PMDIP
Drawing is not to scale.
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M48T39Y
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics 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 SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. (c) 1998 SGS-THOMSON Microelectronics - All Rights Reserved (R) TIMEKEEPER is a registered trademark of SGS-THOMSON Microelectronics TM BYTEWIDE is a trademark of SGS-THOMSON Microelectronics SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
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