M48T02-120PC1 데이터 시트보기 (PDF) - STMicroelectronics

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M48T02-120PC1

CMOS 2K x 8 TIMEKEEPER SRAM

STMicroelectronics 

Figure 3. Block Diagram

M48T08, M48T18

32,768 Hz

CRYSTAL

LITHIUM

CELL

OSCILLATOR AND

CLOCK CHAIN

8 x 8 BiPORT

SRAM ARRAY

POWER

VOLTAGE SENSE

AND

SWITCHING

CIRCUITRY

VPFD

8184 x 8

SRAM ARRAY

A0-A12

DQ0-DQ7

E1

E2

W

G

VCC

INT

VSS

AI01333

DESCRIPTION

The M48T08,18 TIMEKEEPER™ RAM is an 8K x 8

non-volatile static RAM and real time clock which

is pin and functional compatible with the

MK48T08,18. The monolithic chip is available in

two special packages to provide a highly integrated

battery backed-up memory and real time clock

solution.

The M48T08,18 is a non-volatile pin and function

equivalent to any JEDEC standard 8K 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

M48T08,18 silicon with a quartz crystal and a long

life lithium button cell in a single package.

The 28 pin 330mil SO provides sockets with gold

plated contacts at both ends for direct connection

to a separate SNAPHAT™ housing containing the

battery and crystal. The unique design allows the

SNAPHAT battery package to be mounted on top

of the SO package after the completion of the

surface mount process.

AC MEASUREMENT CONDITIONS

Input Rise and Fall Times

Input Pulse Voltages

Input and Output Timing Ref. Voltages

≤ 5ns

0 to 3V

1.5V

Note that Output Hi-Z is defined as the point where data

is no longer driven.

Figure 4. AC Testing Load Circuit

5V

DEVICE

UNDER

TEST

1kΩ

1.8kΩ

OUT

CL = 100pF

CL includes JIG capacitance

AI01019

3/18

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