IDEC DD3S Series - Page 17

17
DD3S Series Display Units
Data
Input
D0
(
H
)
(
L
)
(
H
)
(
L
)
(
H
)
(
L
)
(
H
)
(
L
)
(
H
)
(
L
)
(
H
)
(
L
)
(
H
)
(
L
)
(
H
)
(
L
)
(
H
)
(
L
)
D1
D2
D3
D4
D5
D6
D7
Latch Input
Display Character
Maintains display
Maintains display
“1” “2” “3” “4” “5” “6” “7” “8” “9”
“1” “2” “5” “6” “8”
“9”
Data Input
(D0 to D7)
Latch Input
(Positive Logic)
Latch Input
(Negative Logic)
Maintain
T1 T2 T3
Maintain
Maintain
Maintain
T1 ≥ 0 ms
T2 ≥ 1 ms
T3 ≥ 1 ms
[Character Display Unit]
Latch Operation (Positive Logic)
Latch Input Timing Chart
Note 1: The above chart represents positive logic units. Negative logic units
have characteristics with (H) and (L) reserved.
Note 2: The rise and fall times of input pulses should be made as short as
possible. (0.1 ms maximum)
Note 3: If the data input is changed in the period of T2, the display will
change.
(H)
(L)
(H)
(L)
(H)
(L)
(H)
(L)
(H)
(L)
A
B
C
D
Binary-
Coded
Input
Latch Input
Maintains display
Display Character
“1” “2” “3” “4” “5” “6” “7” “8” “9”
“1” “2” “5” “6” “8” “9”
Maintains
display
Data Input
Latch Input
T1 ≥ 0 ms
T2 ≥ 1 ms
T3 ≥ 1 ms
(H)
(L)
Maintain
Data is
read.
Maintain
T1 T2 T3
Binary-Coded
Input
(Data Input)
4th
Digit
(H)
(L)
(H)
(L)
(H)
(L)
(H)
(L)
3rd
Digit
2nd
Digit
1st
Digit
“4”
4th Digit
Data
“7”
3rd Digit
Data
“5”
2nd Digit
Data
“2”
1st Digit
Data
Latch
Input
Maintain Maintain
Maintain Maintain
Maintain Maintain
Maintain Maintain
ABCD ABCD ABCD ABCD
ABC D
Display
(Example)
Display Unit
4th Digit 3rd Digit 2nd Digit 1st Digit
4th Digit 3rd Digit 2nd Digit 1st Digit
(Block Diagram)
Latch Latch Latch Latch
Binary-Coded Input
(Data Input)
(Latch Input)
1st
4th
3rd
2nd
Latch Input
[Binary/Decimal/Hex/Extra Decimal Display Units]
Latch Operation (Positive Logic)
Latch Input Timing Chart
Note 1: The above chart represents positive logic units. Negative logic units
have characteristics with (H) and (L) reserved.
Note 2: The rise and fall times of input pulses should be made as short as
possible. (0.1 ms maximum)
Note 3: If the data input is changed in the period of T2, the display will
change.
Application of Latch Function