Page 1
1
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.
4) High fan-out.
5) Direct drive of 2 L-TTL inputs and 1LS-TTL input.
•
Block diagram
Q
4
1
Q
1
2
Q
1
3
D1
4
CLOCK
5
POLARITY
6
D
2
7
V
SS
8
V
DD
16
Q4
15
CL D
D4
14
D3
13
Q3
12
Q3
11
Q2
10
Q2
9
QQ
CL D
QQ
CL
D
QQ
CL D
QQ
•
Logic circuit diagram
(6)
LATCH
1
D
1 (4)
D
2 (7)
D
3 (13)
D
4 (14)
CLOCK
(5)
POLARITY
(3)
(10)
(9)
(11)
(12)
(1)
(15)
(2)
Q
1
Q2
Q2
Q3
Q3
Q4
Q4
LATCH
2
LATCH
3
LATCH
4
Q1
•
Truth table
CLOCK POLARITY Q
LL D
H L LATCH
HH D
L H LATCH
Page 2
2
Standard ICs BU4042B
•
Absolute maximum ratings (Ta = 25°C, VSS = 0V)
Parameter Symbol Limits Unit
Power supply voltage V
DD V
Power dissipation mW
Operating temperature – 40 ~ + 85
°C
Storage temperature – 55 ~ + 150 °C
Input voltage V
IN V
Pd
Topr
Tstg
1000 (DIP)
– 0.3 ~ + 18
– 0.3 ~ VDD + 0.3
•
Electrical characteristics
DC characteristics (unless otherwise noted, Ta = 25°C, V
SS = 0V)
Parameter Symbol Min. Typ. Max. Unit Conditions
Input high level voltage
(DATA)
V
IH
3.5 ——
V
5
—7.0 —— 10
11.0 —— 15
Input high level voltage
CLOCK
POLARITY
()
V
IH
3.5 ——
V
5
—7.0 —— 10
11.25 —— 15
Input low level voltage
(DATA)
V
IL
——1.5
V
5
———3.0 10
——4.0 15
Input low level voltage
V
IL
——1.5
V
5
———3.0 10
——3.75 15
Input high level current I
IH
——0.3 µ
A15V
IH
= 15V
Input low level current I
IL
— — – 0.3 µ
A15V
IL
= 0V
Output high level voltage V
OH
4.95 ——
V
5
I
O
= 0mA9.95 —— 10
14.95 —— 15
Output low level voltage V
OL
——0.05
V
5
I
O
= 0mA——0.05 10
——0.05 15
Output high level current I
OH
– 0.16 ——
mA
5VOH = 4.6V
– 0.4 —— 10 V
OH
= 9.5V
– 1.2 —— 15 V
OH
= 13.5V
Output low level current I
OL
0.44 ——
mA
5VOL = 0.4V
1.1 —— 10 V
OL
= 0.5V
3.0 —— 15 V
OL
= 1.5V
Static current dissipation I
DD
——4.0
µ
A
5
V
I
= VDD or GND——8.0 10
——16.0 15
V
DD
(V)
CLOCK
POLARITY
()
Page 3
3
Standard ICs BU4042B
Switching characteristics (unless otherwise noted, Ta = 25°C, CL = 50pF, VSS = 0V)
Parameter Symbol Min. Typ. Max. Unit Conditions
Measurement circuit
t
TLH
—
180
—
ns
5
—
Fig.1
—
90
—
10
—
65
—
15
t
THL
—
100
—
ns
5
—
Fig.1
—
50
—
10
—
40
—
15
Propagation delay time
t
PLH
t
PHL
—
220
—
ns
5
—
Fig.1
—
90
—
10
—
70
—
15
Propagation delay time
CLOCK→Q, Q
t
PLH
t
PHL
—
220
—
ns
5
—
Fig.2
—
90
—
10
—
70
—
15
Minimum clock pulse width t
WH
t
WL
—
150
—
ns
5
—
Fig.2
—
50
—
10
—
40
—
15
Hold time t
H
—
50
—
ns
5
—
Fig.2
—
25
—
10
—
20
—
15
Setup time t
SU
—
50
—
ns
5
—
Fig.2
—
20
—
10
—
5
—
15
Input capacitance C
IN
—
5
—
pF
—— —
VDD (V)
Output fall time
Output rise time
D→Q, Q
•
Measurement circuits
VDD
VDD
VSS
VSS
CK
5
16
POL
6
D
1
4
D2
D3
7
8
D4
14
2
Q
1
3
Q
1
10
Q
2
9
Q
2
11
Q
3
12
Q
3
1
Q
4
5
Q
4
P.G.
13
Fig. 1 (a) Switching characteristics measurement circuit!
Note: Connect CL = 50pF to each of the output pins.
20ns
20ns
t
PLH
tTLH
D
tTHL
tPHL
tPHL
tTHL
tTLH
Q
Q
Fig. 1 (b) Switching time measurement waveform!
Page 4
4
Standard ICs BU4042B
VDD
VSS
VSS
CK
5
16
POL
6
D
1
D3
D2
8
D
4
HL
2
Q
1
3
Q
1
10
Q
2
9
Q
2
11
Q
3
12
Q
3
1
Q
4
15
Q
4
P.G.2
4
7
13
14
P.G.1
Fig. 2 (a) Switching characteristics measurement circuit@
Note : Connect CL = 50pF to each of the output pins.
20ns
20ns
CK
D
Q
90%
50%
10%
20ns
90%
50%
50%
10%
tWH tWL
tPLH
tSU
tPHL
th
Fig. 2 (b) Switching time measurement waveform@
•
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)
DIP16
0.51Min.
0.3
± 0.1
916
81
6.5 ± 0.3
3.2
±
0.2
4.25
±
0.3
0.5 ± 0.1
19.4 ± 0.3
2.54
0° ~ 15°
7.62
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