M27C4002
Table 2. Absolute Maximum Ratings (1)
Symbol
TA
Parameter
Ambient Operating Temperature (3)
Temperature Under Bias
Storage Temperature
Value
–40 to 125
–50 to 125
–65 to 150
–2 to 7
Unit
C
°
TBIAS
TSTG
C
C
°
°
(2)
VIO
Input or Output Voltages (except A9)
Supply Voltage
V
V
V
V
VCC
–2 to 7
(2)
VA9
A9 Voltage
–2 to 13.5
–2 to 14
VPP
Program Supply Voltage
Notes: 1. Except for the rating ”Operating Temperature Range”, stresses above those listed in the Table ”AbsoluteMaximum Ratings”
may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other
conditions above those indicated in the Operating sections of this specification is not implied. Exposure to Absolute Maximum
Rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other
relevant quality documents.
2. Minimum DC voltage on Input or Output is –0.5V with possible undershoot to –2.0Vfor a period less than 20ns. Maximum DC
voltage on Output is VCC +0.5V with possible overshoot to VCC +2V for a period less than 20ns.
3. Depends on range.
Table 3. Operating Modes
Mode
E
VIL
G
A9
X
VPP
VCC or VSS
VCC or VSS
VPP
Q0 - Q15
Data Out
Hi-Z
Read
VIL
VIH
VIH
VIL
VIH
X
Output Disable
Program
VIL
X
VIL Pulse
VIH
X
Data In
Data Out
Hi-Z
Verify
X
VPP
Program Inhibit
Standby
VIH
X
VPP
VIH
X
VCC or VSS
VCC
Hi-Z
Electronic Signature
VIL
VIL
VID
Codes
Note: X = VIH or VIL, VID = 12V ± 0.5V
Table 4. Electronic Signature
Identifier
Manufacturer’s Code
Device Code
A0
VIL
VIH
Q7
0
Q6
0
Q5
Q4
0
Q3
Q2
0
Q1
0
Q0
0
Hex Data
1
0
0
0
20h
44h
0
1
0
1
0
0
Note: Outputs Q8-Q15 are set to ’0’.
Two Line Output Control
Forthe mostefficientuse of thesetwo controllines,
E should be decoded and used as the primary
device selecting function,while G should be made
a common connection to all devices in the array
and connected to the READ line from the system
controlbus. This ensures that all deselectedmem-
ory devices are in their low power standby mode
and that the output pins are only active when data
is required from a particular memory device.
BecauseEPROMsare usuallyusedin largermem-
ory arrays, the product features a 2 line control
function which accommodates the use of multiple
memory connection. The two line control function
allows:
a. the lowest possible memory power dissipation,
b. complete assurance that output bus contention
will not occur.
3/16
STMICROELECTRONICS [ ST ]
