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M87C257-20XC6TR Datasheet(PDF) 2 Page - STMicroelectronics

Part # M87C257-20XC6TR
Description  ADDRESS LATCHED 256K 32K x 8 UV EPROM and OTP EPROM
Download  13 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M87C257-20XC6TR Datasheet(HTML) 2 Page - STMicroelectronics

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background image
A1
A0
Q0
A7
A4
A3
A2
A6
A5
A13
A10
A8
A9
Q7
A14
A11
G
E
Q5
Q1
Q2
Q3
VSS
Q4
Q6
A12
ASVPP
VCC
AI00929
M87C257
8
1
2
3
4
5
6
7
9
10
11
12
13
14
16
15
28
27
26
25
24
23
22
21
20
19
18
17
Figure 2A. DIP Pin Connections
Warning: NC = Not Connected, DU = Dont’t Use.
AI00930
A8
A10
17
A0
NC
Q0
A6
A3
A2
A1
A5
A4
9
A9
1
A11
Q6
Q7
32
M87C257
NC
G
E
25
Figure 2B. LCC Pin Connections
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 VPP and 12V on A9 for Electronic Signa-
ture.
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
Symbol
Parameter
Value
Unit
TA
Ambient Operating Temperature
–40 to 125
°C
TBIAS
Temperature Under Bias
–50 to 125
°C
TSTG
Storage Temperature
–65 to 150
°C
VIO
(2)
Input or Output Voltages (except A9)
–2 to 7
V
VCC
Supply Voltage
–2 to 7
V
VA9
(2)
A9 Voltage
–2 to 13.5
V
VPP
Program Supply Voltage
–2 to 14
V
Notes: 1. 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.
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
voltage on Output is VCC +0.5V with possible overshoot to VCC +2V for a period less than 20ns.
Table 2. Absolute Maximum Ratings (1)
2/13
M87C257


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