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M48T129Y Datasheet(PDF) 2 Page - STMicroelectronics

Part No. M48T129Y
Description  3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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M48T129Y Datasheet(HTML) 2 Page - STMicroelectronics

 
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M48T129Y, M48T129V
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Figure 2. DIP Connections
A1
A0
DQ0
A7
A4
A3
A2
A6
A5
A13
A10
A8
A9
DQ7
A15
A11
G
E
DQ5
DQ1
DQ2
DQ3
VSS
DQ4
DQ6
A16
RST
VCC
AI02261
10
1
2
5
6
7
8
9
11
12
13
14
15
16
30
29
26
25
24
23
22
21
20
19
18
17
A12
A14
W
IRQ/FT
3
4
28
27
32
31
M48T129Y
M48T129V
Table 2. Absolute Maximum Ratings
(1)
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.
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
–0.3 to 7.0
V
M48T129V
–0.3 to 4.6
V
IO
Output Current
20
mA
PD
Power Dissipation
1
W
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-
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
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.


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