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M48T35AY, M48T35AV

Note: 1. Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress

rating only and functional operation of the device at these or any other conditions above those indicated in the operational section

of this specification is not implied. Exposure to the absolute maximum rating conditions for extended periods of time may affect

reliability.

2. 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.

Symbol

Parameter

Value

Unit

Ambient Operating Temperature

Grade 1

0 to 70

°C

Grade 6

–40 to 85

°C

–40 to 85

°C

(2)

Lead Solder Temperature for 10 seconds

260

°C

Input or Output Voltages

M48T35AY

–0.3 to 7

V

M48T35AV

–0.3 to 4.6

V

Supply Voltage

M48T35AY

–0.3 to 7

V

M48T35AV

–0.3 to 4.6

V

Output Current

20

mA

Power Dissipation

1

W

2. See Table 7 for details.

Mode

E

G

W

DQ0-DQ7

Power

Deselect

4.5V to 5.5V

or

3.0V to 3.6V

X

X

High Z

Standby

Write

X

Active

Read

Active

Read

High Z

Active

Deselect

(2)

X

X

X

High Z

CMOS Standby

Deselect

X

X

X

High Z

Battery Back-up Mode

The eight clock bytes are not the actual clock

counters themselves; they are memory locations

consisting of BiPORT™ read/write memory cells.

The M48T35AY/35AV includes a clock control cir-

cuit which updates the clock bytes with current in-

formation once per second. The information can

be accessed by the user in the same manner as

any other location in the static memory array.

The M48T35AY/35AV also has its own Power-fail

Detect circuit. The control circuitry constantly mon-

itors the single 5V supply for an out of tolerance

write protects the SRAM, providing a high degree

of data security in the midst of unpredictable sys-

below approximately 3V, the control circuitry con-

nects the battery which maintains data and clock

operation until valid power returns.