M48T37Y-10MH1 datasheet(4/29 Pages) STMICROELECTRONICS

4 / 29 page

M48T37Y, M48T37V

4/29

SUMMARY DESCRIPTION

The M48T37Y/V TIMEKEEPER® RAM is a 32 Kb

x8 non-volatile static RAM and real time clock. The

monolithic chip is available in a special package

which provides a highly integrated battery backed-

up memory and real time clock solution.

The 44-lead, 330mil SOIC package provides sock-

ets with gold-plated contacts at both ends for di-

rect connection to a separate SNAPHAT housing

containing the battery and crystal. The unique de-

sign allows the SNAPHAT® battery/crystal pack-

age 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 sur-

face-mounting. The SNAPHAT housing is keyed

to prevent reverse insertion.

The SOIC and battery packages are shipped sep-

arately in plastic anti-static tubes or in Tape &Reel

form. For the 44-lead SOIC, the battery/crystal

package (e.g., SNAPHAT) part number is “M4T28-

BR12SH”

“M4T32-BR12SH”

(see

Table

18., page 27).

Caution: Do not place the SNAPHAT battery/crys-

tal top in conductive foam, as this will drain the lith-

ium button-cell battery.

Figure 2. Logic Diagram

Table 1. Signal Names

AI02172

DQ0-DQ7

VCC

M48T37Y

M48T37V

VSS

WDI

RST

IRQ/FT

A0-A14

Address Inputs

DQ0-DQ7

Data Inputs / Outputs

RST

Reset Output (Open Drain)

IRQ/FT

Interrupt / Frequency Test Output

(Open Drain)

WDI

Watchdog Input

Chip Enable

Output Enable

WRITE Enable

VCC

Supply Voltage

VSS

Ground

Not connected Internally

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