Casio TE-3000S Service Manual

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5-9. SRAM (IC23: M5M5408BFP-70H)
5-9-1. Pin Assignment
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
A9
OE
S
A
13
A8
A
M5M5408BFP, TP
15
DQ6
DQ5
DQ4
DQ8
DQ7
A11
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
W
V
CC
(5V)
A10
(0V) GND
DQ
3
DQ2
DQ1
A12
A14
A16
A18
A6
A2
A3
A5
A1
A0
A7
A4
A17
5-9-2. Block Diagram
5-9-3. Pin Function
Mode
DQ
Icc
S
W OE
Write
Read
H
L
L
L
LX
L
H
H
H
XX
Non selection
High-impedance
High-impedance
Active
Standby
Read
A0 ~ A18
DQ1 ~ DQ8
S
W
OE
Vcc
GND
Address input
Data input / output
Chip select input
Write control input
Output inable input
Power supply
Ground supply
Pin
Function
Data input (D)
Active
Active
Data output (Q)
DQ 1
DQ 2
DQ 3
DQ 4
V CC
(
5V
)
GND
(0V)
W
OE
DQ
5
DQ 6
DQ 7
DQ 8
S
A 4
A 5
A 6
A 7
A 12
A 14
A 16
A 17
A 18
A 11
A 9
A 8
A 0
A 1
A 2
A 3
A 13
A 15
A 10
MEMORY ARRAY
ADDRESS INPUT BUFFER
COLUMN
DECODER
BLOCK
DECODER
ROW DECODER
DATA INPUT BUFFER
OUTPUT BUFFER
SENSE AMPLIFIER
ADDRESS INPUT BUFFER
ADDRESS INPUT BUFFER
524288 WORDS
x 8 BITS
C
L
OC
K
GENERATOR
12
11
10
9
25
26
27
28
8
7
6
5
4
3
2
30
1
31
23
24
13
14
15
17
32
22
18
19
20
21
29
16
M5M5408B
FP/TP/RT
M5M5408B
FP/TP/RT

Casio TE-3000S Specifications

General

Brand	Casio
Model	TE-3000S
Category	Cash Register
Language	English