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參數(shù)資料
| 型號： | 87C257 |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | EPROM |
| 英文描述： | ADDRESS LATCHED 256K 32K x 8 UV EPROM and OTP EPROM |
| 中文描述： | 地址鎖存256K 32K的× 8紫外線EPROM和檢察官辦公室存儲器 |
| 文件頁數(shù)： | 2/13頁 |
| 文件大?。?/td> | 143K |
| 代理商： | 87C257 |
A1
A0
Q0
Q1
Q2
A7
A6
A5
A4
A3
A2
A13
A8
A9
A11
G
A10
E
Q7
Q6
A14
Q5
Q4
Q3
VSS
A12
ASVPP
VCC
AI00929
M87C257
8
9
10
11
12
13
14
1
2
3
4
5
6
7
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
A
A8
A9
A11
NC
G
A10
E
Q
17
A0
NC
Q0
Q
Q
D
Q
A6
A5
A4
A3
A2
A1
9
A
1
A
Q6
A
Q7
32
D
V
M87C257
A
Q
25
V
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 V
PP
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
T
A
Ambient Operating Temperature
–40 to 125
°
C
T
BIAS
Temperature Under Bias
–50 to 125
°
C
T
STG
Storage Temperature
–65 to 150
°
C
V
IO (2)
Input or Output Voltages (except A9)
–2 to 7
V
V
CC
Supply Voltage
–2 to 7
V
V
A9 (2)
A9 Voltage
–2 to 13.5
V
V
PP
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 V
CC
+0.5V with possible overshoot to V
CC
+2V for a period less than 20ns.
Table 2. Absolute Maximum Ratings
(1)
2/13
M87C257
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| 87C31X2 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:80C51 8-bit microcontroller family 4K/8K/16K/32K ROM/OTP 128B/256B RAM low voltage 2.7 to 5.5 V, low power, high speed 30/33 MHz |
| 87C32X2 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:80C51 8-bit microcontroller family 4K/8K/16K/32K ROM/OTP 128B/256B RAM low voltage 2.7 to 5.5 V, low power, high speed 30/33 MHz |
| 87C34X2 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:80C51 8-bit microcontroller family 4K/8K/16K/32K ROM/OTP 128B/256B RAM low voltage 2.7 to 5.5 V, low power, high speed 30/33 MHz |
| 87C38X2 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:80C51 8-bit microcontroller family 4K/8K/16K/32K ROM/OTP 128B/256B RAM low voltage 2.7 to 5.5 V, low power, high speed 30/33 MHz |
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