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PRELIMINARY DATA

October 1999

This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

M48T59

M48T59Y/M48T59V

s

INTEGRATED ULTRA LOW POWER SRAM,

REAL TIME CLOCK, POWER-FAIL CONTROL

CIRCUIT and BATTERY

s

FREQUENCY TEST OUTPUT for REAL TIME

CLOCK SOFTWARE CALIBRATION

s

AUTOMATIC POWER-FAIL CHIP DESELECT

and WRITE PROTECTION

s

WRITE PROTECT VOLTAGES

– M48T59: 4.5V

– M48T59Y: 4.2V

– M48T59V: 2.7V

s

SELF-CONTAINED BATTERY and CRYSTAL

in the CAPHAT DIP PACKAGE

s

PACKAGING INCLUDES a 28-LEAD SOIC and

(to be Ordered Separately)

s

SOIC PACKAGE PROVIDES DIRECT

CONNECTION for a SNAPHAT TOP which

CONTAINS the BATTERY and CRYSTAL

s

MICROPROCESSOR POWER-ON RESET

(Valid even during battery back-up mode)

s

PROGRAMMABLE ALARM OUTPUT ACTIVE

in the BATTERY BACK-UP MODE

s

BATTERY LOW FLAG

Figure 1. Logic Diagram

AI01380E

13

A0-A12

W

DQ0-DQ7

VCC

M48T59

M48T59Y

M48T59V

G

VSS

8

E

RST

IRQ/FT

Table 1. Signal Names

A0-A12

Address Inputs

DQ0-DQ7

Data Inputs / Outputs

IRQ/FT

Interrupt / Frequency Test

Output (Open Drain)

RST

Power Fail Reset Output

(Open Drain)

E

Chip Enable

G

Output Enable

W

Write Enable

Supply Voltage

Ground

28

1

28

1

SOH28 (MH)

SNAPHAT (SH)

Battery/Crytstal

PCDIP28 (PC)

Battery/Crystal

CAPHAT