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M27C400-55XF1TR 데이터시트(PDF) 2 Page - STMicroelectronics

부품명 M27C400-55XF1TR
상세설명  4 Mbit (512Kb x8 or 256Kb x16) UV EPROM and OTP EPROM
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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M27C400
2/14
Figure 2. DIP Connections
Q0
Q8
Q1
Q11
A2
VSS
A1
A0
A14
Q15A–1
A15
A16
Q14
A13
BYTEVPP
VSS
Q7
Q12
Q10
Q9
VCC
G
Q4
Q6
A10
A9
E
A3
A17
A8
A6
AI01635
M27C400
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
21
20
19
18
17
Q3
Q2
A5
A4
Q13
Q5
40
39
38
37
36
35
34
33
A12
A11
A7
Table 1. Signal Names
A0-A17
Address Inputs
Q0-Q7
Data Outputs
Q8-Q14
Data Outputs
Q15A–1
Data Output / Address Input
E
Chip Enable
G
Output Enable
BYTEVPP
Byte Mode / Program Supply
VCC
Supply Voltage
VSS
Ground
DEVICE OPERATION
The operating modes of the M27C400 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 M27C400 has two organisations, Word-wide
and Byte-wide. The organisation is selected by the
signal level on the BYTEVPP pin. When BYTEVPP
is at VIH the Word-wide organisation is selected
and the Q15A–1 pin is used for Q15 Data Output.
When the BYTEVPP pin is at VIL the Byte-wide or-
ganisation is selected and the Q15A–1 pin is used
for the Address Input A–1. When the memory is
logically regarded as 16 bit wide, but read in the
Byte-wide organisation, then with A–1 at VIL the
lower 8 bits of the 16 bit data are selected and with
A–1 at VIH the upper 8 bits of the 16 bit data are
selected.
The M27C400 has two control functions, both of
which must be logically active in order to obtain
data at the outputs. In addition the Word-wide or
Byte-
wide
organisation
must
be
selected.
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
from E to output (tELQV). Data is available at the
output after a delay of tGLQV from the falling edge
of G, assuming that E has been low and the ad-
dresses have been stable for at least tAVQV-tGLQV.
Standby Mode
The M27C400 has a standby mode which reduces
the supply current from 50mA to 100µA. The
M27C400 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 G input.


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