M87C257-10C1X Просмотр технического описания (PDF) - STMicroelectronics
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M87C257-10C1X Datasheet PDF : 13 Pages
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M87C257
Figure 2A. DIP Pin Connections
Figure 2B. LCC Pin Connections
ASVPP
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
M87C257
8
21
9
20
10
19
11
18
12
17
13
16
14
15
VCC
A14
A13
A8
A9
A11
G
A10
E
Q7
Q6
Q5
Q4
Q3
AI00929
A6
A5
A4
A3
A2 9
A1
A0
NC
Q0
1 32
M87C257
17
A8
A9
A11
NC
25 G
A10
E
Q7
Q6
AI00930
Warning: NC = Not Connected, DU = Dont’t Use.
Table 2. Absolute Maximum Ratings (1)
Symbol
Parameter
Value
Unit
TA
Ambient Operating Temperature
–40 to 125
°C
TBIAS
Temperature Under Bias
–50 to 125
°C
TSTG
VIO (2)
Storage Temperature
Input or Output Voltages (except A9)
–65 to 150
°C
–2 to 7
V
VCC
VA9 (2)
Supply Voltage
A9 Voltage
–2 to 7
V
–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.
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
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