M48T35 查看數據表（PDF） - STMicroelectronics

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M48T35

5V, 256 Kbit (32 Kb x8) TIMEKEEPER® SRAM

STMicroelectronics 

M48T35, M48T35Y

SUMMARY DESCRIPTION

The M48T35/Y TIMEKEEPER® RAM is a 32Kb x

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

monolithic chip is available in two special packag-

es to provide a highly integrated battery backed-up

memory and real time clock solution.

The M48T35/Y is a non-volatile pin and function

equivalent to any JEDEC standard 32Kb x 8

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, 600mil DIP CAPHAT houses the

M48T35/Y silicon with a quartz crystal and a long

life lithium button cell in a single package.

The 28-pin, 330mil SOIC provides sockets with

gold plated contacts at both ends for direct con-

nection to a separate SNAPHAT® housing con-

taining 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. Inser-

tion of the SNAPHAT housing after reflow pre-

vents potential battery and crystal damage due to

the high temperatures required for device surface-

mounting. The SNAPHAT housing is keyed to pre-

vent reverse insertion. The SOIC and battery/crys-

tal 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-

BR12SH” (see Table 18., page 24).

Figure 3. Logic Diagram

VCC

15

A0-A14

8

DQ0-DQ7

W

M48T35

M48T35Y

E

G

Table 1. Signal Names

A0-A14

Address Inputs

DQ0-DQ7

Data Inputs / Outputs

E

Chip Enable

G

Output Enable

W

WRITE Enable

VCC

Supply Voltage

VSS

Ground

VSS

AI01620B

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