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M27W400-120F6TR Datenblatt(PDF) 2 Page - STMicroelectronics

Teilenummer M27W400-120F6TR
Bauteilbeschribung  4 Mbit 512Kb x8 or 256Kb x16 Low Voltage UV EPROM and OTP EPROM
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M27W400-120F6TR Datenblatt(HTML) 2 Page - STMicroelectronics

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M27W400
2/15
Figure 2A. 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
AI03097
M27W400
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
Figure 2B. LCC Connections
AI03604
A14
Q7
23
Q0
Q8
Q1
A4
A0
E
VSS
A3
A2
12
A16
1
BYTEVPP
A13
Q6
44
M27W400
A12
VSS
Q14
34
A1
A15
Q15A–1
G
DEVICE OPERATION
The operating modes of the M27W400 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 M27W400 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.


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