1/4 preliminary data january 1998 this is preliminary information on a new product now in development or undergoing evaluation. details are subject to change wit hout notice. M48T39Y 256 kb (32k x8) timekeeper ? sram n integrated ultra low power sram, real time clock, power-fail control circuit, battery and crystal n bcd coded year, month, day, date, hours, minutes and seconds n automatic power-fail chip deselect and write protection n write protect voltage (v pfd = power-fail deselect voltage): C M48T39Y: 4.20v v pfd 4.50v n programmable interrupts and square wave output n watchdog timer restarts on out-of-control processor n clock accuracy is better than 1 minute per month at 25c n 10 years of data retention and clock operation in the absence of power n self-contained battery and crystal in dip package n programmable alarm output active in the battery back-up mode n pin and function compatible with ds1386 description the M48T39Y timekeeper ? ram is a non-vol- atile 262,144 bit static ram and real time clock or- ganized 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 inte- grated battery back-up memory and real time clock solution. figure 1. logic diagram ai02311 15 a0-a14 w dq0-dq7 v cc m48z129y g v ss 8 e inta intb sqw 32 1 pmdip32 (pm) module
M48T39Y 2/4 figure 2. dip connections a1 a0 dq0 a7 a4 a3 a2 a6 a5 a13 a10 a8 a9 dq7 sqw a11 g e dq5 dq1 dq2 dq3 v ss dq4 dq6 intb inta v cc ai02312 10 1 2 5 6 7 8 9 11 12 13 14 15 16 30 29 26 25 24 23 22 21 20 19 18 17 a12 a14 w v cc 3 4 28 27 32 31 M48T39Y table 1. signal names a0-a14 address inputs dq0-dq7 data inputs / outputs e chip enable input g output enable input w write enable input inta interrupt output a (open drain) intb interrupt output b (open drain) sqw square wave output v cc supply voltage v ss ground table 2. ordering information scheme for a list of available options (speed, package, etc...) or for further information on any aspect of this de- vice, please contact the st sales office nearest to you. example: M48T39Y -100 pm 1 device type m48t supply voltage and write protect voltage 39y = v cc = 4.5v to 5.5v; v pfd = 4.2v to 4.5v speed -100 = 100ns -150 = 150ns package pm = pmdip32 temperature range 1 = 0 to 70 c
3/4 M48T39Y table 3. pmdip32 - 32 pin plastic module dip, package mechanical data symb mm inches typ min max typ min max a 9.27 9.52 0.3650 0.3748 a1 0.38 C 0.0150 C b 0.43 0.59 0.0169 0.0232 c 0.20 0.33 0.0079 0.0130 d 42.42 43.18 1.6701 1.7000 e 18.03 18.80 0.7098 0.7402 e1 2.29 2.79 0.0902 0.1098 e3 34.29 41.91 1.3500 1.6500 ea 14.99 16.00 0.5902 0.6299 l 3.05 3.81 0.1201 0.1500 s 1.91 2.79 0.0752 0.1098 n32 32 figure 3. pmdip32 - 32 pin plastic module dip, package outline drawing is not to scale. pmdip a1 a l be1 d e n 1 ea e3 s c
M48T39Y 4/4 information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the co nsequences 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 publicati on are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics prod ucts are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectro nics. the st logo is registered trademark of stmicroelectronics a 1998 stmicroelectronics - all rights reserved all other names are the property of their respective owners. stmicroelectronics group of companies australia - brazil - china - finland - france - germany - hong kong - india - italy - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - u.s.a. http://www.st.com
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