HD74HC423A
Dual Retriggerable Monostable Multivibrators
REJ03D0626-0200
(Previous ADE-205-505)
Rev.2.00
Mar 30, 2006
Description
This multivibrator features output-pulse-duration control by two methods. The basic pulse duration is programmed by
selection of external resistance and capacitance values. Once triggered, the basic pulse duration may be extended by
retriggering the gated low-level-active (A) or high-level-active (B) inputs, or be reduced by use of the overriding clear.
The B input is a Schmitt trigger enabling jitter-free triggering from input signals with slow transition rates.
Features
•
High Speed Operation
•
High Output Current: Fanout of 10 LSTTL Loads
•
Wide Operating Voltage: V
CC
= 2 to 6 V
•
Low Input Current: 1
µA
max
•
Low Quiescent Supply Current
•
Ordering Information
Part Name
HD74HC423AP
HD74HC423AFPEL
Package Type
DILP-16 pin
SOP-16 pin (JEITA)
Package Code
(Previous Code)
PRDP0016AE-B
(DP-16FV)
P
Package
Abbreviation
—
EL (2,000 pcs/reel)
Taping Abbreviation
(Quantity)
PRSP0016DH-B
FP
(FP-16DAV)
Note: Please consult the sales office for the above package availability.
Function Table
Clear
L
X
X
H
Note:
Inputs
A
X
H
X
L
Outputs
B
X
X
L
H
Q
L
L
L
Q
H
H
H
H
1. H; High level, L; Low level, X; Irrelevant
Rev.2.00 Mar 30, 2006 page 1 of 8
HD74HC423A
Pin Arrangement
1A
1B
1CLR
1Q
2Q
2Cext
2Rext/Cect
GND
1
2
3
4
5
6
7
8
CLR
CLR
16
15
14
13
12
11
10
9
V
CC
1Rext/Cext
1Cext
1Q
2Q
2CLR
2B
2A
(Top view)
Logic Diagram (1/2)
Rext Cext
V
CC
V
H
V
L
OUT
Q
Q
A
B
CLR
CK
CK
CLR
To Another
Transceiver
Absolute Maximum Ratings
Item
Supply voltage range
Input / Output voltage
Input / Output diode current
Output current
V
CC
, GND current
Power dissipation
Symbol
V
CC
V
IN
, V
OUT
I
IK
, I
OK
I
OUT
I
CC
or I
GND
P
T
Ratings
–0.5 to 7.0
–0.5 to V
CC
+0.5
±20
±25
±50
500
Unit
V
V
mA
mA
mA
mW
Storage temperature
Tstg
–65 to +150
°C
Note: The absolute maximum ratings are values, which must not individually be exceeded, and furthermore, no two of
which may be realized at the same time.
Rev.2.00 Mar 30, 2006 page 2 of 8
HD74HC423A
Recommended Operating Conditions
Item
Supply voltage
Input / Output voltage
Operating temperature
Input rise / fall time
Note:
*1
Symbol
V
CC
V
IN
, V
OUT
Ta
t
r
, t
f
Ratings
2 to 6
0 to V
CC
–40 to 85
0 to 1000
0 to 500
0 to 400
Unit
V
V
°C
Conditions
V
CC
= 2.0 V
ns
V
CC
= 4.5 V
V
CC
= 6.0 V
1. This item guarantees maximum limit when one input switches.
Waveform: Refer to test circuit of switching characteristics.
Electrical Characteristics
Ta = 25°C
Item
Input voltage
Symbol V
CC
(V)
V
IH
2.0
4.5
6.0
V
IL
2.0
4.5
6.0
2.0
4.5
6.0
4.5
6.0
V
OL
2.0
4.5
6.0
4.5
6.0
Input current
Quiescent Standby
Supply
state
current
Active
state
Iin
I
CC
6.0
6.0
Min
1.5
3.15
4.2
—
—
—
1.9
4.4
5.9
4.18
5.68
—
—
—
—
—
—
—
—
Typ
—
—
—
—
—
—
2.0
4.5
6.0
—
—
0.0
0.0
0.0
—
—
—
—
—
Max
—
—
—
0.5
1.35
1.8
—
—
—
—
—
0.1
0.1
0.1
0.26
0.26
±0.1
130
130
Ta = –40 to+85°C
Min
1.5
3.15
4.2
—
—
—
1.9
4.4
5.9
4.13
5.63
—
—
—
—
—
—
—
—
Max
—
—
—
0.5
1.35
1.8
—
—
—
—
—
0.1
0.1
0.1
0.33
0.33
±1.0
220
220
µA
µA
I
OH
= 4 mA
I
OH
= 5.2 mA
Vin = V
CC
or GND
Vin = V
CC
or
I
OUT
= 0
µA
GND
Rext / Cext =
0.5 V
CC
V
I
OH
= –4 mA
I
OH
= –5.2 mA
Vin = V
IH
or V
IL
I
OL
= 20
µA
V
Unit
V
Test Conditions
Output voltage
V
OH
V
Vin = V
IH
or V
IL
I
OH
= –20
µA
Rev.2.00 Mar 30, 2006 page 3 of 8
HD74HC423A
Switching Characteristics
(C
L
= 50 pF, Input t
r
= t
f
= 6 ns)
Ta = 25°C
Item
Propagation delay
time
Symbol V
CC
(V)
t
PLH
2.0
4.5
6.0
t
PHL
2.0
4.5
6.0
2.0
4.5
6.0
t
PLH
2.0
4.5
6.0
2.0
4.5
6.0
Removal time
t
rem
2.0
4.5
6.0
2.0
4.5
6.0
t
WQ
t
TLH
t
THL
Cin
4.5
2.0
4.5
6.0
—
—
Min
—
—
—
—
—
—
—
—
—
—
—
—
150
30
26
0
0
0
—
—
—
—
—
—
—
—
—
Typ
—
20
—
—
21
—
—
17
—
—
15
—
—
6
—
—
–3
—
1.5
450
380
1.0
—
5
—
—
5
Max
210
42
36
240
48
41
170
34
29
180
36
31
—
—
—
—
—
—
—
—
—
—
75
15
13
20
10
Ta = –40 to +85°C
Min
—
—
—
—
—
—
—
—
—
—
—
—
190
38
33
5
5
5
—
—
—
—
—
—
—
—
—
Max
265
53
45
300
60
51
215
43
37
225
45
38
—
—
—
—
—
—
—
—
—
—
95
19
16
20
10
pF
Pins 7 & 15
Other pins
ns
Clear
ns
Clear to
Q
ns
A or B to
Q
Unit
ns
Test Conditions
A or B to Q
t
PHL
ns
Clear to Q
Pulse width
t
w
ns
A, B, Clear
Minimum output
pulse width
Output pulse width
Output rise/fall
time
Input capacitance
t
WQ (min)
µs
ns
ms
ns
Cext = 28 pF
Rext = 6 kΩ
Rext = 2 kΩ
Cext = 0.1
µF,
Rext = 10 kΩ
Caution in use: In order to prevent any malfunctions due to noise, connect a highfrequency performance capacitor
between V
CC
and GND, and keep the wiring between the external components and Cext, Rext/Cext pins
as short as possible.
Test Circuit
Measurement point
C
L*
Note: C
L
includes the probe and fig capacitance.
Rev.2.00 Mar 30, 2006 page 4 of 8
HD74HC423A
Application Data
Vcc = 2.5 V
10000.0
Output Pulse Width twQ (µs)
1000.0
100.0
10.0
Rext
1.0
1 kΩ
10 kΩ
100 kΩ
1 MΩ
0.1
10
2
10
3
10
4
10
5
10
6
10
7
Timing Capacitance Cext (pF)
Vcc = 3.3 V
10000.0
twQ (µs)
Output Pulse Width
1000.0
100.0
10.0
Rext
1.0
1 kΩ
10 kΩ
100 kΩ
1 MΩ
0.1
10
2
10
3
10
4
10
5
10
6
10
7
Timing Capacitance Cext (pF)
Rev.2.00 Mar 30, 2006 page 5 of 8
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