HD44780U Datasheet, PDF (52/59 Pages) Hitachi Semiconductor – Dot Matrix Liquid Crystal Display Controller/Driver

HD44780U
AC Characteristics (V_CC = 4.5 to 5.5 V, T_a = –30 to +75°C*³)
Clock Characteristics
Item
Symbol Min Typ Max Unit Test Condition Notes*
External External clock frequency f_cp
125 250 350 kHz
11
clock
External clock duty
Duty 45
50
55
%
11
operation
External clock rise time
t _rcp
—
—
0.2 µs
11
External clock fall time
t _fcp
—
—
0.2 µs
11
R_f
Clock oscillation frequency f_OSC
190 270 350 kHz R_f = 91 kΩ
12
oscillation
V_CC = 5.0 V
Note: * Refer to the Electrical Characteristics Notes section following these tables.
Bus Timing Characteristics
Write Operation
Item
Symbol Min
Typ
Max
Unit
Test Condition
Enable cycle time
t _cycE
500
—
—
ns
Figure 25
Enable pulse width (high level)
PW_EH
230
—
—
Enable rise/fall time
t_Er, t_Ef
—
—
20
Address set-up time (RS, R/W to E) t_AS
40
—
—
Address hold time
t _AH
10
—
—
Data set-up time
t _DSW
80
—
—
Data hold time
t_H
10
—
—
Read Operation
Item
Symbol Min
Typ
Max
Unit
Test Condition
Enable cycle time
t _cycE
500
—
Enable pulse width (high level)
PW_EH
230
—
Enable rise/fall time
t_Er, t_Ef
—
—
Address set-up time (RS, R/W to E) t_AS
40
—
Address hold time
t _AH
10
—
Data delay time
t _DDR
—
—
Data hold time
t _DHR
5
—
—
ns
—
20
—
—
160
—
Figure 26
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