BU4042B 반도체 회로 부품 판매점
Quad D latch
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 ROHM Semiconductor |
Standard ICs
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 “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.
•Features
1) Low power dissipation.
2) Wide range of operating power supply voltages.
3) High input impedance.
•Block diagram
4) High fan-out.
5) Direct drive of 2 L-TTL inputs and 1LS-TTL input.
•Logic circuit diagram
Q4 1
Q1 2
Q1 3
D1 4
CLOCK 5
POLARITY 6
D2 7
VSS 8
CL D
QQ
CL D
QQ
CL D
QQ
CL D
QQ
16 VDD
15 Q4
14 D4
13 D3
12 Q3
11 Q3
10 Q2
9 Q2
D1 (4)
D2 (7)
D3 (13)
D4 (14)
CLOCK
(5)
POLARITY
(6)
LATCH
1
LATCH
2
LATCH
3
LATCH
4
(2) Q1
(3) Q1
(10) Q2
(9) Q2
(11) Q3
(12) Q3
(1) Q4
(15) Q4
•Truth table
CLOCK
L
H
H
L
POLARITY
L
L
H
H
Q
D
LATCH
D
LATCH
1
Standard ICs
BU4042B
•Absolute maximum ratings (Ta = 25°C, VSS = 0V)
Parameter
Symbol
Limits
Power supply voltage
VDD – 0.3 ~ + 18
Power dissipation
Pd 1000 (DIP)
Operating temperature
Topr
– 40 ~ + 85
Storage temperature
Tstg – 55 ~ + 150
Input voltage
VIN – 0.3 ~ VDD + 0.3
Unit
V
mW
°C
°C
V
•Electrical characteristics
DC characteristics (unless otherwise noted, Ta = 25°C, VSS = 0V)
Parameter
Symbol Min.
Typ.
Max.
Input high level voltage
(DATA)
Input high level voltage
( )CLOCK
POLARITY
Input low level voltage
(DATA)
Input low level voltage
( )CLOCK
POLARITY
Input high level current
Input low level current
Output high level voltage
Output low level voltage
Output high level current
Output low level current
Static current dissipation
3.5 —
—
VIH 7.0 —
—
11.0
—
—
3.5 —
—
VIH 7.0 —
—
11.25
—
—
— — 1.5
VIL — — 3.0
— — 4.0
— — 1.5
VIL — — 3.0
— — 3.75
IIH — — 0.3
IIL — — – 0.3
4.95
—
—
VOH 9.95
—
—
14.95
—
—
— — 0.05
VOL — — 0.05
— — 0.05
– 0.16
—
—
IOH – 0.4
—
—
– 1.2
—
—
0.44
—
—
IOL 1.1 —
—
3.0 —
—
— — 4.0
IDD — — 8.0
— — 16.0
Unit
V
V
V
V
µA
µA
V
V
mA
mA
µA
VDD (V)
5
10
15
5
10
15
5
10
15
5
10
15
15
15
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
Conditions
—
—
—
—
VIH = 15V
VIL = 0V
IO = 0mA
IO = 0mA
VOH = 4.6V
VOH = 9.5V
VOH = 13.5V
VOL = 0.4V
VOL = 0.5V
VOL = 1.5V
VI = VDD or GND
2
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제조업체: ROHM Semiconductor
( rohm )
BU4042B latch
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[ BU4042B.PDF ]
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