
Two Line Output Control
BecauseEPROMsareusuallyusedinlargermem-
ory arrays, the product features a 2 line control
functionwhich accommodatesthe use of multiple
memory connection. The two line control function
allows:
a. the lowest possible memory power dissipation,
b. complete assurancethat output bus contention
will not occur.
Symbol
Parameter
Value
Unit
T
A
Ambient Operating Temperature
(3)
–40 to125
°
C
T
BIAS
Temperature Under Bias
–50 to125
°
C
T
STG
V
IO(2)
Storage Temperature
–65 to150
°
C
Input or Output Voltages (except A9)
–2 to7
V
V
CC
V
A9(2)
Supply Voltage
–2 to7
V
A9 Voltage
–2 to13.5
V
V
PP
Program Supply Voltage
–2 to14
V
Notes:
1. Except for therating ”O(jiān)perating Temperature Range”, stresses above those listed in theTable ”AbsoluteMaximum Ratings”
may cause permanentdamage to thedevice. These are stress ratings only and operation of the device at these or any other
conditions above those indicated in the Operatingsections of this specification is not implied.Exposure to Absolute Maximum
Rating conditions for extendedperiods may affectdevice reliability.Refer also tothe 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 V
CC
+0.5Vwith possible overshoot to V
CC
+2V for a periodless than 20ns.
3. Depends on range.
Table2. AbsoluteMaximumRatings
(1)
Mode
E
G
A9
V
PP
Q0 - Q15
Read
V
IL
V
IL
X
V
CC
or V
SS
Data Out
Output Disable
V
IL
V
IH
X
V
CC
or V
SS
Hi-Z
Program
V
IL
Pulse
V
IH
X
V
PP
Data In
Verify
V
IH
V
IL
X
V
PP
Data Out
Program Inhibit
V
IH
V
IH
X
V
PP
Hi-Z
Standby
V
IH
X
X
V
CC
or V
SS
Hi-Z
Electronic Signature
V
IL
V
IL
V
ID
V
CC
Codes
Note
: X =V
IH
or V
IL
, V
ID
= 12V
±
0.5V
Table3. OperatingModes
Identifier
A0
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
Hex Data
Manufacturer’s Code
V
IL
0
0
1
0
0
0
0
0
20h
Device Code
V
IH
0
1
0
0
0
1
0
0
44h
Note:
OutputsQ8-Q15 are set to ’0’.
Table4. ElectronicSignature
Forthemostefficientuse of thesetwocontrollines,
E should be decoded and used as the primary
deviceselectingfunction,while G shouldbe made
a common connection to all devices in the array
and connected to the READ line from the system
controlbus.Thisensuresthat all deselectedmem-
ory devices are in their low power standby mode
and that the output pins are only active when data
is requiredfrom a particularmemory device.
3/16
M27C4002