M48T12(1998) 查看數據表（PDF） - STMicroelectronics
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M48T12 Datasheet PDF : 15 Pages
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M48T02, M48T12
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
TSLD (2)
Lead Solder Temperature for 10 seconds
260
°C
VIO
Input or Output Voltages
–0.3 to 7
V
VCC
Supply Voltage
–0.3 to 7
V
IO
Output Current
20
mA
PD
Power Dissipation
1
W
Notes: 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 –0.3 volts are not allowed on any pin while in the Battery Back-up mode.
Table 3. Operating Modes
Mode
VCC
E
G
Deselect
VIH
X
4.75V to 5.5V
Write
or
VIL
X
Read
4.5V to 5.5V
VIL
VIL
Read
VIL
VIH
Deselect VSO to VPFD (min)
X
X
Deselect
≤ VSO
X
X
Notes: X = VIH or VIL; VSO = Battery Back-up Switchover Voltage.
W
DQ0-DQ7
Power
X
High Z
Standby
VIL
DIN
Active
VIH
DOUT
Active
VIH
High Z
Active
X
High Z
CMOS Standby
X
High Z Battery Back-up Mode
Figure 2. DIP Pin Connections
A7 1
A6 2
24 VCC
23 A8
A5 3
22 A9
A4 4
21 W
A3 5
20 G
A2 6 M48T02 19 A10
A1 7 M48T12 18 E
A0 8
17 DQ7
DQ0 9
16 DQ6
DQ1 10
15 DQ5
DQ2 11
14 DQ4
VSS 12
13 DQ3
AI01028
DESCRIPTION (cont’d)
The M48T02/12 button cell has sufficient capacity
and storagelife to maintain data and clockfunction-
ality for an accumulated time period of at least 10
years in the absence of power over the operating
temperature range.
The M48T02/12 is a non-volatile pin and function
equivalent to any JEDEC standard 2Kb x8 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.
As Figure 3 shows,the staticmemory array and the
quartz controlled clock oscillator of the M48T02/12
are integrated on one silicon chip. The two circuits
are interconnected at the upper eight memory lo-
cations to provide user accessible BYTEWIDE
clock informationin the bytes with addresses7F8h-
7FFh. The clock locations contain the year, month,
date,day, hour, minute, and secondin 24 hour BCD
format. Corrections for 28, 29 (leap year), 30, and
31 day months are made automatically.
2/15
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