M87C257 STMICROELECTRONICS [STMicroelectronics], M87C257 Datasheet - Page 2

• Manufacturer Part Number: M87C257
• Description: ADDRESS LATCHED 256K 32K x 8 UV EPROM and OTP EPROM
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

M87C257
Figure 2A. DIP Pin Connections
Table 2. Absolute Maximum Ratings
Notes: 1. Except for the rating "Operating Temperature Range", stresses above those listed in the Table "Absolute Maximum Ratings"
DEVICE OPERATION
The modes of operation of the M87C257 are listed
in the Operating Modes. A single power supply is
required in the read mode. All inputs are TTL levels
except for V
ture.
2/13
Symbol
V
V
T
T
V
V
A9
T
IO
BIAS
STG
CC
2. Minimum DC voltage on Input or Output is –0.5V with possible undershoot to –2.0V for a period less than 20ns. Maximum DC
PP
A
(2)
(2)
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.
voltage on Output is V
ASV PP
V SS
A12
PP
Q0
Q1
Q2
A7
A6
A5
A4
A3
A2
A1
A0
Ambient Operating Temperature
Temperature Under Bias
Storage Temperature
Input or Output Voltages (except A9)
Supply Voltage
A9 Voltage
Program Supply Voltage
and 12V on A9 for Electronic Signa-
1
2
3
4
5
6
7
8
9
10
11
12
13
14
M87C257
CC
+0.5V with possible overshoot to V
AI00929
28
27
26
25
24
23
22
21
20
19
18
17
16
15
Parameter
V CC
A14
A13
A8
A9
A11
G
A10
E
Q7
Q6
Q5
Q4
Q3
(1)
CC
+2V for a period less than 20ns.
Figure 2B. LCC Pin Connections
Warning: NC = Not Connected, DU = Dont’t Use.
Read Mode
The M87C257 has two control functions, both of
which must be logically active 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
NC
Q0
A6
A5
A4
A3
A2
A1
A0
9
–40 to 125
–50 to 125
–65 to 150
–2 to 7
–2 to 7
–2 to 13.5
–2 to 14
M87C257
Value
17
1
32
25
AI00930
A8
A9
A11
NC
G
A10
E
Q7
Q6
Unit
V
V
V
V
C
C
C