HD44780 Hitachi Semiconductor (acquired by Renesas), HD44780 Datasheet - Page 49

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

AC Characteristics (V
Clock Characteristics
Item
External
clock
operation
R
oscillation
Note:
Bus Timing Characteristics
Write Operation
Item
Enable cycle time
Enable pulse width (high level)
Enable rise/fall time
Address set-up time (RS, R/W to E) t
Address hold time
Data set-up time
Data hold time
Read Operation
Item
Enable cycle time
Enable pulse width (high level)
Enable rise/fall time
Address set-up time (RS, R/W to E) t
Address hold time
Data delay time
Data hold time
f
*
External clock frequency
External clock duty
External clock rise time
External clock fall time
Clock oscillation frequency f
Refer to the Electrical Characteristics Notes section following these tables.
CC
= 2.7 to 4.5 V, T
Symbol
t
PW
t
t
t
t
Symbol
t
PW
t
t
t
t
cycE
Er
AS
AH
DSW
H
cycE
Er
AS
AH
DDR
DHR
Symbol Min
f
Duty
t
t
cp
rcp
fcp
OSC
, t
, t
EH
EH
Ef
Ef
125
45
—
—
190
Min
1000
450
—
60
20
195
10
Min
1000
450
—
60
20
—
5
a
= –30 to +75 C*
Typ
250
50
—
—
270
Typ
—
—
—
—
—
—
—
Typ
—
—
—
—
—
—
—
Max
350
55
0.2
0.2
350
Max
—
—
25
—
—
—
—
Max
—
—
25
—
—
360
—
3
)
Unit
kHz
%
kHz
s
s
Unit
ns
Unit
ns
Test Condition Note*
R
V
CC
f
= 75 k ,
= 3 V
Test Condition
Figure 25
Test Condition
Figure 26
HD44780U
11
12
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