M48T129Y datasheet(4/30 Pages) STMICROELECTRONICS

4 / 30 page

M48T129Y, M48T129V

4/30

DESCRIPTION

The M48T129Y/V TIMEKEEPER® RAM is a

128 Kb x 8 non-volatile static RAM and real-time

clock with programmable alarms and a watchdog

timer. The special DIP package provides a fully in-

tegrated battery back-up memory and real-time

clock solution. The M48T129Y/V directly replaces

industry standard 128 Kb x 8 SRAM. It also pro-

vides the non-volatility of Flash without any re-

quirement for special WRITE timing or limitations

on the number of WRITEs that can be performed.

For surface-mount environments ST provides an

equivalent SMT solution consisting of a 44-pin,

330mil

SOIC

TIMEKEEPER

SUPERVISOR

(M48T201V/Y) and a 32-pin, (TSOP, 8 x 20mm)

1Mb LPSRAM.

The 44-pin, 330mil SOIC provides sockets with

gold plated contacts at both ends for direct con-

nection to a separate SNAPHAT® housing con-

taining the battery.

The unique design allows the SNAPHAT battery

package to be mounted on top of the SOIC pack-

age after the completion of the surface-mount pro-

cess. Insertion of the SNAPHAT housing after

reflow prevents potential battery damage due to

the high temperatures required for device surface-

mounting. The SNAPHAT housing is keyed to pre-

vent reverse insertion.

The SNAPHAT battery package is shipped sepa-

rately in plastic anti-static tubes or in Tape & Reel

form. The part number is “M4Txx-BR12SH1” (see

Table 18., page 28).

The 32-pin, 600mil DIP Hybrid houses a controller

chip, SRAM, quartz crystal, and a long life lithium

button cell in a single package.

Figure 2. Logic Diagram

Table 1. Signal Names

AI02260

A0-A16

DQ0-DQ7

VCC

M48T129Y

M48T129V

VSS

RST

IRQ/FT

A0-A16

Address Inputs

DQ0-DQ7

Data Inputs / Outputs

Chip Enable Input

Output Enable Input

WRITE Enable Input

RST

Reset Output (open drain)

IRQ/FT

Interrupt / Frequency Test

Output (open drain)

VCC

Supply Voltage

VSS

Ground

M48T129Y датащи(PDF) 4 Page - STMicroelectronics

M48T129Y датащи(HTML) 4 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

датащи скачать

ссылки URL