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M27128A-3F1 View Datasheet(PDF) - STMicroelectronics

Part NameDescriptionManufacturer
M27128A-3F1 NMOS 128K (16K x 8) UV EPROM ST-Microelectronics
STMicroelectronics ST-Microelectronics
M27128A-3F1 Datasheet PDF : 10 Pages
1 2 3 4 5 6 7 8 9 10
M27128A
Table 2. Absolute Maximum Ratings
Symbol
Parameter
Value
Unit
TA
Ambient Operating Temperature
grade 1
grade 6
0 to 70
–40 to 85
°C
TBIAS
Temperature Under Bias
grade 1
grade 6
–10 to 80
–50 to 95
°C
TSTG
Storage Temperature
–65 to 125
°C
VIO
Input or Output Voltages
–0.6 to 6.25
V
VCC
Supply Voltage
–0.6 to 6.25
V
VA9
A9 Voltage
–0.6 to 13.5
V
VPP
Program Supply
–0.6 to 14
V
Note: Except for the rating "Operating Temperature Range", stresses above those listed in the Table "Absolute Maximum 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 SGS-THOMSON SURE Program and other relevant quality documents.
Figure 2. DIP Pin Connections
VPP
A12
A7
A6
A5
A4
A3
A2
A1
A0
Q0
Q1
Q2
VSS
1
28
2
27
3
26
4
25
5
24
6
23
7
22
M27128A
8
21
9
20
10
19
11
18
12
17
13
16
14
15
VCC
P
A13
A8
A9
A11
G
A10
E
Q7
Q6
Q5
Q4
Q3
AI00770
DEVICE OPERATION
The seven modes of operation of the M27128A are
listed in the Operating Modes table. A single 5V
power supply is required in the read mode. All
inputs are TTL levels except for VPP and 12V on A9
for Electronic Signature.
Read Mode
The M27128A has two control functions, both of
which must be logically satisfied in order to obtain
data at the outputs. Chip Enable (E) is the power
control and should be used for device selection.
Output Enable (G) is the output control and should
be used to gate data to the output pins, inde-
pendent of device selection.
Assuming that the addresses are stable, address
access time (tAVQV) is equal to the delay from E to
output (tELQV). Data is available at the outputs after
the falling edge of G, assuming that E has been low
and the addresses have been stable for at least
tAVQV-tGLQV.
Standby Mode
The M27128A has a standby mode which reduces
the maximum active power current from 85mA to
40mA. The M27128A is placed in the standby mode
by applying a TTL high signal to the E input. When
in the standby mode, the outputs are in a high
impedance state, independent of the G input.
Two Line Output Control
Because EPROMs are usually used in larger mem-
ory arrays, this 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.
2/10
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