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M27C256B-80B6X

更新时间： 2024-02-08 03:15:51
品牌 Logo 应用领域
意法半导体 - STMICROELECTRONICS 可编程只读存储器电动程控只读存储器
页数 文件大小 规格书
16页 149K
描述
256 Kbit (32Kb x 8) UV EPROM and OTP EPROM

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M27C256B-80B6X 数据手册

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M27C256B  
Table 5. AC Measurement Conditions  
High Speed  
≤ 10ns  
Standard  
≤ 20ns  
Input Rise and Fall Times  
Input Pulse Voltages  
0 to 3V  
1.5V  
0.4V to 2.4V  
0.8V and 2V  
Input and Output Timing Ref. Voltages  
Figure 3. AC Testing Input Output Waveform  
Figure 4. AC Testing Load Circuit  
1.3V  
High Speed  
1N914  
3V  
1.5V  
3.3kΩ  
0V  
DEVICE  
UNDER  
TEST  
OUT  
Standard  
C
L
2.4V  
2.0V  
0.8V  
0.4V  
C
C
C
= 30pF for High Speed  
= 100pF for Standard  
includes JIG capacitance  
L
L
L
AI01822  
AI01823B  
(1)  
Table 6. Capacitance  
Symbol  
(T = 25 °C, f = 1 MHz)  
A
Parameter  
Test Condition  
Min  
Max  
6
Unit  
pF  
C
V
= 0V  
= 0V  
Input Capacitance  
Output Capacitance  
IN  
IN  
C
OUT  
V
OUT  
12  
pF  
Note: 1. Sampled only, not 100% tested.  
DEVICE OPERATION  
dresses are stable, the address access time  
(t  
) is equal to the delay from E to output  
). Data is available at the output after delay  
AVQV  
The operating modes of the M27C256B are listed  
in the Operating Modes. A single power supply is  
required in the read mode. All inputs are TTL lev-  
(t  
ELQV  
of t  
from the falling edge of G, assuming that  
GLQV  
E has been low and the addresses have been sta-  
els except for V and 12V on A9 for Electronic  
PP  
ble for at least t  
-t  
.
AVQV GLQV  
Signature.  
Standby Mode  
Read Mode  
The M27C256B has a standby mode which reduc-  
es the supply current from 30mA to 100µA. The  
M27C256B is placed in the standby mode by ap-  
plying a CMOS high signal to the E input. When in  
the standby mode, the outputs are in a high imped-  
ance state, independent of the G input.  
The M27C256B 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  
be used to gate data to the output pins, indepen-  
dent of device selection. Assuming that the ad-  
4/16  
1234567...16

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