M28256 データシートの表示（PDF） - STMicroelectronics
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M28256 Datasheet PDF : 20 Pages
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M28256
Figure 2A. DIP Connections
A14 1
A12 2
28 VCC
27 W
A7 3
26 A13
A6 4
25 A8
A5 5
24 A9
A4 6
23 A11
A3 7
22 G
M28256
A2 8
21 A10
A1 9
20 E
A0 10
19 DQ7
DQ0 11
18 DQ6
DQ1 12
17 DQ5
DQ2 13
16 DQ4
VSS 14
15 DQ3
AI01886
Figure 2C. SO Connections
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
VSS
1
28
2
27
3
26
4
25
5
24
6
23
7
22
8 M28256 21
9
20
10
19
11
18
12
17
13
16
14
15
AI01888
VCC
W
A13
A8
A9
A11
G
A10
E
DQ7
DQ6
DQ5
DQ4
DQ3
Figure 2B. PLLC Connections
A6
A5
A4
A3
A2 9
A1
A0
NC
DQ0
1 32
M28256
17
A8
A9
A11
NC
25 G
A10
E
DQ7
DQ6
Note: 1. NC = Not Connected
2. DU = Do Not Use
AI01887
Figure 2D. TSOP Connections
G 22
21 A10
A11
E
A9
DQ7
A8
DQ6
A13
DQ5
W
DQ4
VCC 28 M28256 15 DQ3
A14 1
14 VSS
A12
DQ2
A7
DQ1
A6
DQ0
A5
A0
A4
A1
A3 7
8 A2
AI01889
and require a single voltage supply (5V or 3V, de-
pending on the option chosen).
The device has been designed to offer a flexible
microcontroller interface, featuring both hardware
and software handshaking, with Ready/Busy,
Data Polling and Toggle Bit. The device supports
a 64 byte Page Write operation. Software Data
Protection (SDP) is also supported, using the stan-
dard JEDEC algorithm.
SIGNAL DESCRIPTION
The external connections to the device are sum-
marized in Table 1, and their use in Table 3.
Addresses (A0-A14). The address inputs are
used to select one byte from the memory array
during a read or write operation.
Data In/Out (DQ0-DQ7). The contents of the data
byte are written to, or read from, the memory array
through the Data I/O pins.
Chip Enable (E). The chip enable input must be
held low to enable read and write operations.
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