M48T02, M48T12

4/19

Figure 4. Block Diagram

MAXIMUM RATING

Stressing the device above the rating listed in the

“Absolute Maximum Ratings” table may cause

permanent damage to the device. These are

stress ratings only and operation of the device at

these or any other conditions above those indicat-

ed in the Operating sections of this specification is

not implied. Exposure to Absolute Maximum Rat-

ing conditions for extended periods may affect de-

vice

reliability.

Refer

also

to

the

STMicroelectronics SURE Program and other rel-

evant quality documents.

Table 2. Absolute Maximum Ratings

Note: 1. Soldering temperature not to exceed 260°C for 10 seconds (total thermal budget not to exceed 150°C for longer than 30 seconds).

CAUTION: Negative undershoots below –0.3V are not allowed on any pin while in the Battery Back-up mode.

AI01329

LITHIUM

CELL

OSCILLATOR AND

CLOCK CHAIN

VPFD

VCC

VSS

32,768 Hz

CRYSTAL

VOLTAGE SENSE

AND

SWITCHING

CIRCUITRY

8 x 8 BiPORT

SRAM ARRAY

2040 x 8

SRAM ARRAY

A0-A10

DQ0-DQ7

E

W

G

POWER

BOK

Symbol

Parameter

Value

Unit

Ambient Operating Temperature

0 to 70

°C

–40 to 85

°C

(2)

Lead Solder Temperature for 10 seconds

260

°C

Input or Output Voltages

–0.3 to 7

V

Supply Voltage

–0.3 to 7

V

Output Current

20

mA

Power Dissipation

1

W