M95640 ST Microelectronics, M95640 Datasheet - Page 5

• Manufacturer Part Number: M95640
• Description: 64/32/16/8 Kbit Serial SPI Bus EEPROM With High Speed Clock
• Manufacturer: ST Microelectronics

SUMMARY DESCRIPTION
These electrically erasable programmable memo-
ry (EEPROM) devices are accessed by a high
speed SPI-compatible bus. The memory array is
organized as 8192 x 8 bit (M95640), and 4096 x 8
bit (M95320).
The device is accessed by a simple serial interface
that is SPI-compatible. The bus signals are C, D
and Q, as shown in Table 1 and Figure 2.
The device is selected when Chip Select (S) is tak-
en Low. Communications with the device can be
interrupted using Hold (HOLD).
Figure 2. Logic Diagram
HOLD
W
D
C
S
V CC
V SS
M95xxx
Q
AI01789C
Figure 3. DIP and SO Connections
Note: 1. See page 33 (onwards) for package dimensions, and how
Figure 4. TSSOP14 Connections
Note: 1. See page 33 (onwards) for package dimensions, and how
Table 1. Signal Names
C
D
Q
S
W
HOLD
V
V
CC
SS
2. NC = Not Connected
to identify pin-1.
to identify pin-1.
V SS
V SS
NC
NC
NC
Serial Clock
Serial Data Input
Serial Data Output
Chip Select
Write Protect
Hold
Supply Voltage
Ground
W
W
Q
S
Q
S
1
2
3
4
5
6
7
1
2
3
4
M95xxx
M95xxx
AI02346C
AI01790D
14
13
12
11
10
9
8
8
7
6
5
M95640, M95320
V CC
HOLD
NC
NC
NC
C
D
V CC
HOLD
C
D
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