M48T129V 查看數據表（PDF） - STMicroelectronics
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M48T129V Datasheet PDF : 22 Pages
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M48T129Y, M48T129V
Figure 2. DIP Connections
RST
A16
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
VSS
1
32
2
31
3
30
4
29
5
28
6
27
7
26
8 M48T129Y 25
9 M48T129V 24
10
23
11
22
12
21
13
20
14
19
15
18
16
17
VCC
A15
IRQ/FT
W
A13
A8
A9
A11
G
A10
E
DQ7
DQ6
DQ5
DQ4
DQ3
AI02261
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
Table 2. Absolute Maximum Ratings (1)
Symbol
Parameter
Value
Unit
TA
Ambient Operating Temperature
0 to 70
°C
TSTG Storage Temperature (VCC Off, Oscillator Off)
–40 to 85
°C
VIO
Input or Output Voltages
–0.3 to VCC+0.3
V
VCC
Supply Voltage
M48T129Y
M48T129V
–0.3 to 7.0
V
–0.3 to 4.6
V
IO
Output Current
20
mA
PD
Power Dissipation
1
W
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.
DESCRIPTION
The M48T129Y/V TIMEKEEPER RAM is a 128Kb
x 8 non-volatile static RAM and real time clock,
with programmable alarms and a watchdog timer.
The special DIP package provides a fully integrat-
ed battery back-up memory and real time clock so-
lution. The M48T129Y/V directly replaces industry
standard 128Kb x 8 SRAM. It also provides the
non-volatility of Flash without any requirement for
special write timing or limitations on the number of
writes that can be performed.
For surface mount environments ST provides a
Chip Set solution consisting of a 44 pin 330mil
SOIC TIMEKEEPER Supervisor (M48T201V/Y)
and a 32 pin TSOP (8 x 20mm) LPSRAM
(M68Z128/W) packages.
The 44 pin 330mil SOIC provides sockets with
gold plated contacts at both ends for direct con-
nection to a separate SNAPHAT housing contain-
ing 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-
2/22
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