M48T59_08 datasheet(5/32 Pages) STMICROELECTRONICS

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Product(s)

M48T59, M48T59Y, M48T59V

Description

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Description

The M48T59/Y/V TIMEKEEPER® RAM is an 8 Kb x 8 non-volatile static RAM and real-time

clock. The monolithic chip is available in two special packages to provide a highly integrated

battery backed-up memory and real-time clock solution.

The M48T59/Y/V is a non-volatile pin and function equivalent to any JEDEC standard 8 Kb

x8 SRAM. It also easily fits into many ROM, EPROM, and EEPROM sockets, providing the

non-volatility of PROMs without any requirement for special write timing or limitations on the

number of writes that can be performed.

The 28-pin, 600 mil DIP CAPHAT™ houses the M48T59/Y/V silicon with a quartz crystal

and a long life lithium button cell in a single package.

The 28-pin, 330 mil SOIC provides sockets with gold plated contacts at both ends for direct

connection to a separate SNAPHAT® housing containing 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. Insertion of the SNAPHAT

housing after reflow prevents potential battery and crystal damage due to the high

temperatures required for device surface-mounting. The SNAPHAT housing is keyed to

prevent reverse insertion.

The SOIC and battery/crystal packages are shipped separately in plastic anti-static tubes or

in Tape & Reel form. For the 28-lead SOIC, the battery/crystal package (e.g., SNAPHAT)

part number is “M4T28-BR12SH1” or “M4T32-BR12SHx” (see Table 19 on page 30).

Caution:

Do not place the SNAPHAT battery/crystal top in conductive foam, as this will drain the

lithium button-cell battery.

Figure 1.

Logic diagram

AI01380E

A0-A12

DQ0-DQ7

VCC

M48T59

M48T59Y

M48T59V

VSS

RST

IRQ/FT

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