Ram:lsi2 And Lsi3 (Cxk58257) - Casio SF-5300E Service Manual & Parts List

Pin No. Name
64,65 OSC I/O
67,69~71 V1 ~ 4
68 NC
72 INTO
73 STNT
74 VLCD
75 ~ 171
S0 ~ 95
172 ~199 C5 ~ 32
168,200 NC
7-2. RAM: LSI2 and LSI3 (CXK58257)
22
OE–
23
A11
24
A9
25
A8
26
A13
27
WE–
28
VCC
1
A14
2
A12
3
A7
4
A6
5
A5
6
A4
7
A3
Pin No. Name
1~10,21,23~26 A0 ~ 14
11~13,15~19 IO1 ~ IO8
14 GND
20 CE
22 OE
27 WE
28 VCC
I/O
I/O Clock terminal
Voltage for LCD drive
OFF: 0 V ON– V1: 0.64 Minimum ~ 1.29 Maximum V
- Not used
In Low battery detection
In Power supply terminal (+5.3 V)
In Power supply terminal (+5.3 V)
Out Segment signal for display
Out Common signal for display
- Not used
I/O
In Address bus
I/O Data bus
In GND 0 V
In Chip select signal from LSI1
In 0 V
In Write enable signal from LSI1
In Power supply terminal (+ 5.3 V)
— —
21
Description
V2: 1.29 Minimum ~ 2.56 Maximum V
V3: 3.99 Minimum ~ 2.71 Maximum V
V4: 4.64 Minimum ~ 3.99 Maximum V
INTO < 5.2 V => No power on
21
A10
20
CE–
19
IO8
18
IO7
17
IO6
16
IO5
15
IO4
14
GND
13
IO3
12
IO2
11
IO1
10
A0
9
A1
8
A2
Description