M27C320 データシートの表示（PDF） - STMicroelectronics
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M27C320 Datasheet PDF : 15 Pages
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M27C320
Figure 2A. SO Connections
NC
A18
A17
A7
A6
A5
A4
A3
A2
A1
A0
E
VSS
GVPP
Q0
Q8
Q1
Q9
Q2
Q10
Q3
Q11
1
44
2
43
3
42
4
41
5
40
6
39
7
38
8
37
9
36
10
35
11 M27C320 34
12
33
13
32
14
31
15
30
16
29
17
28
18
27
19
26
20
25
21
24
22
23
AI02153
A20
A19
A8
A9
A10
A11
A12
A13
A14
A15
A16
BYTE
VSS
Q15A–1
Q7
Q14
Q6
Q13
Q5
Q12
Q4
VCC
Table 1. Signal Names
A0-A20
Address Inputs
Q0-Q7
Data Outputs
Q8-Q14
Data Outputs
Q15A–1
Data Output / Address Input
E
Chip Enable
GVPP
Output Enable / Program Supply
BYTE
Byte-Wide Select
VCC
Supply Voltage
VSS
Ground
NC
Not Connected Internally
Figure 2B. TSOP Connections
BYTE
A16
A15
A14
A13
A12
A11
A10
A9
A8
A19
VSS
A20
A18
A17
A7
A6
A5
A4
A3
A2
A1
A0
E
1
48 VSS
VSS
Q15A–1
Q7
Q14
Q6
Q13
Q5
Q12
Q4
12
37
M27C320
13
36
VCC
VCC
VSS
Q11
Q3
Q10
Q2
Q9
Q1
Q8
Q0
GVPP
VSS
24
25 VSS
AI02154
DEVICE OPERATION
The operating modes of the M27C320 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 M27C320 has two organisations, Word-wide
and Byte-wide. The organisation is selected by the
signal level on the BYTE pin. When BYTE is at VIH
the Word-wide organisation is selected and the
Q15A–1 pin is used for Q15 Data Output. When
the BYTE pin is at VIL the Byte-wide organisation
is selected and the Q15A–1 pin is used for the Ad-
dress Input A–1. When the memory is logically re-
garded 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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