HD44780 Hitachi Semiconductor (acquired by Renesas), HD44780 Datasheet - Page 55

• Manufacturer Part Number: HD44780
• Description: Dot Matrix Liquid Crystal Display Controller/driver
• Manufacturer: Hitachi Semiconductor (acquired by Renesas)

6. Applies to input pins and I/O pins, excluding the OSC1 pin.
7. Applies to I/O pins.
8. Applies to output pins.
9. Current flowing through pull–up MOSs, excluding output drive MOSs.
10. Input/output current is excluded. When input is at an intermediate level with CMOS, the excessive
11. Applies only to external clock operation.
12. Applies only to the internal oscillator operation using oscillation resistor R
R
current flows through the input circuit to the power supply. To avoid this from happening, the input
level must be fixed high or low.
f
500
400
300
200
100
Oscillator
(270)
OSC1
OSC2
Open
50
V
R (k )
OSC1
OSC2
(91)
CC
f
100
R :
R :
Since the oscillation frequency varies depending on the OSC1 and
OSC2 pin capacitance, the wiring length to these pins should be minimized.
= 5 V
f
f
75 k
91 k
150
max.
min.
typ.
2% (when V
2% (when V
0.7 V
0.5 V
0.3 V
Duty =
CC
CC
CC
Th + Tl
CC
CC
Th
= 3 V)
= 5 V)
500
400
300
200
100
t
(270)
rcp
100%
Th
50
(75)
t
fcp
V
R (k )
f
CC
.
f
100
= 3 V
Tl
max.
min.
typ.
150
HD44780U
55