M48T35 datasheet(3/18 Pages) STMICROELECTRONICS

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M48T35, M48T35Y

nection to a separate SNAPHAT housing contain-

ing 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

(i.e.

SNAPHAT)

part

number

"M4T28-

BR12SH1".

As Figure 3 shows, the static memory array and

the quartz controlled clock oscillator of the

M48T35/35Y are integrated on one silicon chip.

The two circuits are interconnected at the upper

eight memory locations to provide user accessible

BYTEWIDE clock information in the bytes with ad-

dresses 7FF8h-7FFFh.

Table 3. Operating Modes (1)

Note: 1. X = VIH or VIL; VSO = Battery Back-up Switchover Voltage.

2. See Table 7 for details.

Mode

VCC

DQ0-DQ7

Power

Deselect

4.75V to 5.5V

4.5V to 5.5V

VIH

High Z

Standby

Write

VIL

DIN

Active

Read

VIL

VIH

DOUT

Active

Read

VIL

VIH

High Z

Active

Deselect

VSO to VPFD (min)

(2)

High Z

CMOS Standby

Deselect

≤ VSO

High Z

Battery Back-up Mode

Figure 3. Block Diagram

AI01623

LITHIUM

CELL

OSCILLATOR AND

CLOCK CHAIN

VPFD

VCC

VSS

32,768 Hz

CRYSTAL

VOLTAGE SENSE

AND

SWITCHING

CIRCUITRY

8 x 8 BiPORT

SRAM ARRAY

32,760 x 8

SRAM ARRAY

A0-A14

DQ0-DQ7

POWER

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