BU4042B Rohm, BU4042B Datasheet

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BU4042B

Manufacturer Part Number
BU4042B
Description
Quad D latch
Manufacturer
Rohm
Datasheet
The BU4042B is a four-circuit D latch with a common clock line and separate data input terminals.
When the polarity input is set to “H”, input (D) is presented to output (Q) as is, as long as the clock input is rising, and
when the clock input falls, output (Q) holds input (D) at that point. While the clock input is falling, output (Q) does not
change even if input (D) changes.
Also, if the polarity input is set to “L”, input (D) is presented to output (Q) as is, as long as the clock input is at “L”
level, and when the clock input goes to “H” level, latching takes place.
1) Low power dissipation.
2) Wide range of operating power supply voltages.
3) High input impedance.
Features
Block diagram
Truth table
Quad D latch
BU4042B
Standard ICs
CLOCK
POLARITY
H
H
CLOCK
L
L
V
Q
Q
Q
D
D
SS
1
1
1
2
4
1
2
3
4
5
6
7
8
POLARITY
H
H
L
L
CL D
CL D
CL D
CL D
Q
Q
Q
Q
Q
Q
Q
Q
16
15
14
13
12
11
10
9
LATCH
LATCH
V
Q
D
D
Q
Q
Q
Q
DD
4
4
3
3
3
2
2
Q
D
D
4) High fan-out.
5) Direct drive of 2 L-TTL inputs and 1LS-TTL input.
Logic circuit diagram
POLARITY
D
D
CLOCK
D
D
3
4
1
2
(13)
(14)
(4)
(7)
(5)
(6)
LATCH
LATCH
LATCH
LATCH
1
2
3
4
(2)
(3)
(10)
(9)
(11)
(12)
(1)
(15)
Q
Q
Q
Q
Q
Q
Q
Q
1
1
2
2
3
3
4
4
1

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BU4042B Summary of contents

Page 1

... Quad D latch BU4042B The BU4042B is a four-circuit D latch with a common clock line and separate data input terminals. When the polarity input is set to “H”, input (D) is presented to output (Q) as is, as long as the clock input is rising, and when the clock input falls, output (Q) holds input (D) at that point. While the clock input is falling, output (Q) does not change even if input (D) changes. Also, if the polarity input is set to “ ...

Page 2

... OH – 1.2 — — 0.44 — — 1.1 — — OL 3.0 — — — — 4.0 — — 8.0 DD — — 16.0 BU4042B Unit Unit Conditions V ( — — — — 15 ...

Page 3

... D t PLH Q t TLH t PHL Q t THL Fig. 1 (b) Switching time measurement waveform! BU4042B Fig.1 Fig.1 Fig.1 Fig.2 Fig.2 Fig.2 Fig.2 — t PHL t THL t TLH 3 ...

Page 4

... DIP16 20ns 10 PHL Fig. 2 (b) Switching time measurement waveform@ 150 7. BU4042B 20ns 90% 50% 20ns 90% 50% 50% 10 PLH ...

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