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HD44780 Datasheet(PDF) 49 Page - Hitachi Semiconductor

Part No. HD44780
Description  Dot Matrix Liquid Crystal Display Controller/Driver
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Maker  HITACHI [Hitachi Semiconductor]
Homepage  http://www.renesas.com/eng
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 49 page
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HD44780U
49
AC Characteristics (V
CC = 2.7 to 4.5 V, Ta = –30 to +75°C*
3)
Clock Characteristics
Item
Symbol Min
Typ
Max
Unit
Test Condition Note*
External
External clock frequency
f
cp
125
250
350
kHz
11
clock
External clock duty
Duty
45
50
55
%
operation
External clock rise time
t
rcp
0.2
µs
External clock fall time
t
fcp
0.2
µs
R
f
oscillation
Clock oscillation frequency f
OSC
190
270
350
kHz
R
f = 75 kΩ,
V
CC = 3 V
12
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
1000
ns
Figure 25
Enable pulse width (high level)
PW
EH
450
Enable rise/fall time
t
Er, t Ef
——
25
Address set-up time (RS, R/
W to E) t
AS
60
Address hold time
t
AH
20
Data set-up time
t
DSW
195
Data hold time
t
H
10
Read Operation
Item
Symbol
Min
Typ
Max
Unit
Test Condition
Enable cycle time
t
cycE
1000
ns
Figure 26
Enable pulse width (high level)
PW
EH
450
Enable rise/fall time
t
Er, t Ef
——
25
Address set-up time (RS, R/
W to E) t
AS
60
Address hold time
t
AH
20
Data delay time
t
DDR
360
Data hold time
t
DHR
5—




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