M48T129V(2005) 查看數據表（PDF） - STMicroelectronics
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M48T129V Datasheet PDF : 30 Pages
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M48T129Y, M48T129V
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
VCC
17
A0-A16
W
E
G
M48T129Y
M48T129V
8
DQ0-DQ7
RST
IRQ/FT
VSS
AI02260
Table 1. Signal Names
A0-A16
Address Inputs
DQ0-DQ7
Data Inputs / Outputs
E
Chip Enable Input
G
Output Enable Input
W
WRITE Enable Input
RST
Reset Output (open drain)
IRQ/FT
Interrupt / Frequency Test
Output (open drain)
VCC
Supply Voltage
VSS
Ground
4/30
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