參數(shù)資料
型號: HD44780U
廠商: Hitachi,Ltd.
英文描述: Dot Matrix Liquid Crystal Display Controller/Driver
中文描述: 點(diǎn)陣式液晶顯示控制器/驅(qū)動器
文件頁數(shù): 52/59頁
文件大小: 316K
代理商: HD44780U
HD44780U
52
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
clock
operation
External clock frequency
f
cp
Duty
125
250
350
kHz
11
External clock duty
45
50
55
%
11
External clock rise time
t
rcp
t
fcp
0.2
μ
s
μ
s
11
External clock fall time
0.2
11
R
oscillation
Note:
Clock oscillation frequency f
OSC
190
270
350
kHz
R
f
= 91 k
V
CC
= 5.0 V
12
*
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
PW
EH
t
Er
, t
Ef
t
AS
t
AH
t
DSW
t
H
500
ns
Figure 25
Enable pulse width (high level)
230
Enable rise/fall time
Address set-up time (RS, R/
W
to E)
20
40
Address hold time
10
Data set-up time
80
Data hold time
10
Read Operation
Item
Symbol
Min
Typ
Max
Unit
Test Condition
Enable cycle time
t
cycE
PW
EH
t
Er
, t
Ef
t
AS
t
AH
t
DDR
t
DHR
500
ns
Figure 26
Enable pulse width (high level)
230
Enable rise/fall time
Address set-up time (RS, R/
W
to E)
20
40
Address hold time
10
Data delay time
160
Data hold time
5
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