ROHM BU4042B

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.
•1)Features
Low power dissipation.
2) Wide range of operating power supply voltages.
3) High input impedance.
•Block diagram
Q4
Q1
•Logic circuit diagram
1
2
16 VDD
CL D
3
D1 (4)
LATCH
1
(2)
Q1
(3)
Q1
LATCH
2
(10) Q2
LATCH
3
(11) Q3
LATCH
4
(1)
15 Q4
Q Q
Q1
4) High fan-out.
5) Direct drive of 2 L-TTL inputs and 1LS-TTL input.
D2 (7)
14 D4
(9)
Q2
CL D
D1
CLOCK
4
5
Q Q
CL D
13 D3
D3 (13)
12 Q3
(12) Q3
Q Q
POLARITY
D4 (14)
11 Q3
6
CL D
D2
7
VSS
8
Q Q
CLOCK
(5)
10 Q2
9
Q4
(15) Q4
POLARITY
(6)
Q2
•Truth table
CLOCK
POLARITY
Q
L
L
D
H
L
LATCH
H
H
D
L
H
LATCH
1
Standard ICs
BU4042B
•Absolute maximum ratings (Ta = 25°C, V
SS
Parameter
= 0V)
Symbol
Limits
Power supply voltage
VDD
– 0.3 ~ + 18
V
Power dissipation
Pd
1000 (DIP)
mW
Operating temperature
Topr
– 40 ~ + 85
°C
Storage temperature
Tstg
– 55 ~ + 150
°C
– 0.3 ~ VDD + 0.3
V
Input voltage
VIN
characteristics
•DCElectrical
characteristics (unless otherwise noted, Ta = 25°C, V
Parameter
Input high level voltage
(DATA)
Symbol
VIH
Input high level voltage
( CLOCK
POLARITY )
Input low level voltage
(DATA)
VIH
VIL
SS
= 0V)
Min.
Typ.
Max.
3.5
—
—
7.0
—
—
11.0
—
—
15
3.5
—
—
5
7.0
—
—
11.25
—
—
—
—
1.5
—
—
3.0
—
—
4.0
—
—
1.5
VIL
—
—
3.0
—
—
3.75
Input high level current
IIH
—
—
Input low level current
IIL
Input low level voltage
( CLOCK
POLARITY )
Output high level voltage
Output low level voltage
Output high level current
Output low level current
Static current dissipation
2
Unit
VOH
VOL
IOH
IOL
IDD
Unit
VDD (V)
V
10
Conditions
5
V
—
10
—
15
5
V
10
—
15
5
V
10
0.3
µA
15
VIH = 15V
µA
15
VIL = 0V
—
—
– 0.3
4.95
—
—
15
5
V
9.95
—
—
14.95
—
—
15
—
—
0.05
5
—
—
0.05
—
—
0.05
– 0.16
—
—
– 0.4
—
—
—
V
10
10
IO = 0mA
IO = 0mA
15
mA
5
VOH = 4.6V
10
VOH = 9.5V
– 1.2
—
—
15
VOH = 13.5V
0.44
—
—
5
VOL = 0.4V
1.1
—
—
10
VOL = 0.5V
VOL = 1.5V
mA
3.0
—
—
15
—
—
4.0
5
—
—
8.0
—
—
16.0
µA
10
15
VI = VDD or GND
Standard ICs
BU4042B
Switching characteristics (unless otherwise noted, Ta = 25°C, CL = 50pF, VSS = 0V)
Parameter
Symbol
Output rise time
tTLH
Output fall time
tTHL
Propagation delay time
D→Q, Q
tPLH
tPHL
Propagation delay time
CLOCK→Q, Q
tPLH
tPHL
Minimum clock pulse width
tWH
tWL
Hold time
tH
Setup time
tSU
Input capacitance
CIN
•Measurement circuits
Min.
Typ.
Max.
Unit
—
180
—
—
90
—
—
65
—
—
100
—
—
50
—
—
40
—
15
—
220
—
5
—
90
—
—
70
—
15
—
220
—
5
—
90
—
—
70
—
—
150
—
—
50
—
—
40
—
15
—
50
—
5
—
25
—
—
20
—
—
50
—
—
20
—
—
5
—
—
5
—
VDD (V)
Conditions
Measurement circuit
—
Fig.1
—
Fig.1
—
Fig.1
—
Fig.2
—
Fig.2
—
Fig.2
—
Fig.2
—
—
5
ns
10
15
5
ns
10
ns
10
ns
10
15
5
ns
10
ns
10
15
5
ns
10
15
pF
—
VDD
16
5
6
4
7
13
14
P.G.
VDD
CK
POL
D1
D2
D3
D4
VSS
Q1
2
Q1
3
Q2
10
Q2
9
Q3
11
Q3
12
Q4
1
Q4
5
20ns
20ns
D
tPLH
tPHL
Q
tTLH
tTHL
tPHL
8
Q
VSS
Note: Connect CL = 50pF to each of the output pins.
Fig. 1 (a) Switching characteristics measurement circuit!
tTHL
tTLH
Fig. 1 (b) Switching time measurement waveform!
3
Standard ICs
BU4042B
VDD
16
5
6
4
7
13
14
P.G.1
CK
Q1
2
Q1
3
Q2
10
D1
Q2
9
D2
Q3
11
Q3
12
Q4
1
Q4
15
POL
D3
D4
VSS
P.G.2
20ns
20ns
90%
50%
CK
10%
20ns
D
tWH
90%
50%
tPHL
10%
tWL
50%
tSU
th
8
HL
tPLH
VSS
Q
Note : Connect CL = 50pF to each of the output pins.
Fig. 2 (a) Switching characteristics measurement [email protected]
•Electrical characteristic curve
POWER DISSIPATION : Pd (mW)
1200
1000
800
600
400
200
0
0
25
50
75
100
125
150
AMBIENT TEMPERATURE : Ta (°C)
Fig.3 Power dissipation vs. Ta
•External dimensions (Units: mm)
19.4 ± 0.3
9
1
8
0.51Min.
3.2 ± 0.2 4.25 ± 0.3
6.5 ± 0.3
16
7.62
0.3 ± 0.1
2.54
0.5 ± 0.1
DIP16
4
0° ~ 15°
Fig. 2 (b) Switching time measurement [email protected]