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M27V322 데이터시트(PDF) 2 Page - STMicroelectronics

부품명 M27V322
상세설명  32 Mbit (2Mb x16) Low Voltage UV EPROM and OTP EPROM
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M27V322 데이터시트(HTML) 2 Page - STMicroelectronics

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Figure 2A. DIP Connections
GVPP
Q0
Q8
A3
A0
E
VSS
A2
A1
A13
VSS
A14
A15
Q7
A12
A16
A20
Q15
Q5
Q2
Q3
VCC
Q11
Q4
Q14
A9
A8
A17
A4
A18
A19
A7
AI03051
M27V322
8
1
2
3
4
5
6
7
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
20
19
18
17
Q1
Q9
A6
A5
Q6
Q13
42
39
38
37
36
35
34
33
A11
A10
Q10
21
Q12
40
41
from E to output (tELQV). Data is available at the
output after a delay of tGLQV from the falling edge
of GVPP, assuming that E has been low and the
addresses have been stable for at least tAVQV-
tGLQV.
Standby Mode
The M27V322 has a standby mode which reduces
the supply current from 30mA to 30µA. The
M27V322 is placed in the standby mode by apply-
ing 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 GVPP input.
Two Line Output Control
Because EPROMs are usually used in larger
memory arrays, this product features a 2 line con-
trol function which accommodates the use of mul-
tiple memory connection. The two line control
function allows:
a. the lowest possible memory power dissipation,
b. complete assurance that output bus contention
will not occur.
For the most efficient use of these two control
lines, E should be decoded and used as the prima-
ry device selecting function, while GVPP should be
made a common connection to all devices in the
array and connected to the READ line from the
system control bus. This ensures that all deselect-
ed memory devices are in their low power standby
mode and that the output pins are only active
when data is required from a particular memory
device.
Table 1. Signal Names
A0-A20
Address Inputs
Q0-Q15
Data Outputs
E
Chip Enable
GVPP
Output Enable / Program Supply
VCC
Supply Voltage
VSS
Ground
DEVICE OPERATION
The operating modes of the M27V322 are listed in
the Operating Modes Table. A single power supply
is required in the read mode. All inputs are TTL
compatible except for VPP and 12V on A9 for the
Electronic Signature.
Read Mode
The M27V322 has a word-wide organization. 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 independent of device selection.
Assuming that the addresses are stable, the ad-
dress access time (tAVQV) is equal to the delay


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