HD61830 Datasheet, PDF (26/43 Pages) Hitachi Semiconductor – LCDC (LCD Timing Controller)

HD61830/HD61830B
9. The current which flows into the input and output circuits is excluded. When the input of CMOS is
in the intermediate level, current flows through the input circuit, resulting in the increase of power
supply current. To avoid this, input must be fixed at high or low.
The relationship between the operating frequency and the power dissipation is given below.
50
Max
40
30
Typ
20
10
0
250
500 750 1000 1250 1500
f_OSC ^(kHz)
10. Applied to the operation of the internal oscillator when oscillation resistor R_f and oscillation
capacity C_f are used.
R
R_f
C
C_f
CR
C_f = 15 pF ±5%
R_f = 39 kΩ ±2%
(when f_OSC =
500 kHz typ)
The relationship among oscillation frequency, R_f and C_f is given below.
f_OSC (kHz)
T_a = 25°C, V_CC = 5 V
800
600
400
200
C_f = 10 pF
C_f = 15 pF
0
40
60 80 100 120 140 160 180
R_f (kΩ)
26