M48Z02-150PC1_99 데이터 시트보기 (PDF) - STMicroelectronics
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M48Z02-150PC1_99 Datasheet PDF : 12 Pages
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M48Z02, M48Z12
Table 2. Absolute Maximum Ratings (1)
Symbol
Parameter
Value
Unit
TA
Ambient Operating Temperature
–40 to 85
°C
TSTG
TSLD (2)
Storage Temperature (VCC Off)
Lead Solder Temperature for 10 seconds
–40 to 85
°C
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
VIH
High Z
Active
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 M48Z02 19 A10
A1 7 M48Z12 18 E
A0 8
17 DQ7
DQ0 9
16 DQ6
DQ1 10
15 DQ5
DQ2 11
14 DQ4
VSS 12
13 DQ3
AI01187
DESCRIPTION (cont’d)
The M48Z02/12 is a non-volatile pin and function
equivalent to any JEDEC standard 2K x 8 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.
The M48Z02/12 also has its own Power-fail Detect
circuit. The control circuitry constantly monitors the
single 5V supply for an out of tolerance condition.
When VCC is out of tolerance, the circuit write
protects the SRAM, providing a high degree of data
security in the midst of unpredictable system op-
eration brought on by low VCC. As VCC falls below
approximately 3V, the control circuitry connects the
battery which maintains data and clock operation
until valid power returns.
2/12
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