Casio QT-6100 Service Manual page 82

3. BR93L46RF (IC35)
CS
SK
DI
DO
4. HD74LV00 (IC29)
1A 1
1B 2
1Y 3
2A 4
2B 5
2Y 6
GND 7
5. HD74LV74 (IC25)
1CLR
1 14
1D
2 13
1CLK
3 12
1PRE
4 11
1Q 5 10
6 9
1Q
7 8
GND
logic diagram, each flip-flop (positive logic)
PRE
CLK
C
D TG
C
CLR
Pin Name
Vcc
Vcc
GND
CS
NC
SK
NC DI
DO
GND
14 VCC
13 4B
12 4A
11 4Y
10 3B
9 3A
8 3Y
FUNCTION TABLE
VCC
PRE
2CLR
L
2D
H
2CLK
L
H
2PRE
H
2Q
H
2Q
* This configuration is nonstable; that is, it does not
persist when PRE or CLR returns to its inactive
(high) level.
C
C
C
TG
C
C
TG
C
— 80 —
I/O Function
- Power Supply
- GND
INPUT Chip Selct
INPUT Serial Clock Input
INP Start bit,Cord,Address,Serial data
OUTPUT Serial data input, READY/BUSY status
INPUTS OUTPUTS
CLR CLK D Q
H X X H
L X X L
H *
L X X
H H H
H L L
H L X Q 0
C
TG
C
Q
L
H
H *
L
H
Q 0
Q
Q