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MM74HC423AN

P1-P3P4-P6P7-P9P10-P10
www.fairchildsemi.com 4
MM74HC423A
Theory of Operation (Continued)
RESET OPERATION
These one shots may be reset during the generation of the
output pulse. In the reset mode of operation, an input pulse
on clear sets the reset latch and causes the capacitor to be
fast charged to V
CC
by turning on transistor Q1 5. When
the voltage on the capacitor reaches V
REF2
, the reset latch
will clear and then be ready to accept another pulse. If the
clear input is held LOW, any trigger inputs that occur will be
inhibited and the Q and Q
outputs of the output latch will
not change. Since the Q output is reset when an input low
level is detected on the Clear input, the output pulse T can
be made significantly shorter than the minimum pulse width
specification.
Typical Output Pulse Width vs.
Timing Components
Typical Distribution of Output
Pulse Width, Part to Part
Typical 1ms Pulse Width Variation vs. Supply
Minimum R
EXT
vs. Supply Voltage
Typical 1ms Pulse Width Variation vs. Temperature
Note: R and C are not subjected to temperature. The C is polypropylene.
5 www.fairchildsemi.com
MM74HC423A
Absolute Maximum Ratings(Note 2)
(Note 3)
Recommended Operating
Conditions
Note 2: Maximum Ratings are those values beyond which damage to the
device may occur.
Note 3: Unless otherwise specified all voltages are referenced to ground.
Note 4: Power Dissipation Temperature Derating: Plastic “N” Package: −
12mW/°C from 65°C to 85°C.
DC Electrical Characteristics (Note 5)
Note 5: For a power supply of 5V ±10% the worst-case output voltages (V
OH
, V
OL
) occur for HC at 4.5V. Thus the 4.5V values should be used when design-
ing with this supply. Worst-case V
IH
and V
IL
occur at V
CC
= 5.5V and 4.5V respectively. (The V
IH
value at 5.5V is 3.85V.) The worst-case leakage current
(I
IN
, I
CC
, and I
OZ
) occur for CMOS at the higher voltage and so the 6.0V values should be used.
Supply Voltage (V
CC
) −0.5V to +7.0V
DC Input Voltage (V
IN
) −1.5V to V
CC
+1.5V
DC Output Voltage (V
OUT
) −0.5V to V
CC
+0.5V
Clamp Diode Current (I
IK
, I
OK
) ±20 mA
DC Output Current, per pin (I
OUT
) ±25 mA
DC V
CC
or GND Current,
per pin (I
CC
) ±50 mA
Storage Temperature Range (T
STG
) −65°C to +150°C
Power Dissipation (P
D
)
(Note 4) 600 mW
S.O. Package only 500 mW
Lead Temperature (T
L
)
(Soldering 10 seconds) 260
°C
Min Max Units
Supply Voltage (V
CC
)26V
DC Input or Output Voltage 0 V
CC
V
(V
IN
, V
OUT
)
Operating Temperature Range (T
A
) −40 +85 °C
Maximum Input Rise and Fall Time
(Clear Input)
V
CC
= 2.0V 1000 ns
V
CC
= 4.5V 500 ns
V
CC
= 6.0V 400 ns
Symbol Parameter Conditions
V
CC
T
A
= 25°CT
A
= −40 to 85°CT
A
= −55 to 125°C
Units
Typ Guaranteed Limits
V
IH
Minimum HIGH Level 2.0V 1.5 1.5 1.5
VInput Voltage 4.5V 3.15 3.15 3.15
6.0V 4.2 4.2 4.2
V
IL
Maximum LOW Level 2.0V 0.3 0.3 0.3
VInput Voltage 4.5V 0.9 0.9 0.9
6.0V 1.2 1.2 1.2
V
OH
Minimum HIGH Level V
IN
= V
IH
or V
IL
V
Output Voltage |I
OUT
| ≤ 20 µA 2.0V 2.0 1.9 1.9 1.9
4.5V 4.5 4.4 4.4 4.4
6.0V 6.0 5.9 5.9 5.9
V
IN
= V
IH
or V
IL
|I
OUT
| ≤ 4.0 mA 4.5V 3.96 3.84 3.7
|I
OUT
| ≤ 5.2 mA 6.0V 5.46 5.34 5.2
V
OL
Maximum LOW Level V
IN
= V
IH
or V
IL
V
Output Voltage |I
OUT
| ≤ 20 µA 2.0V 0 0.1 0.1 0.1
4.5V 0 0.1 0.1 0.1
6.0V 0 0.1 0.1 0.1
V
IN
= V
IH
or V
IL
|I
OUT
| ≤ 4 mA 4.5V 0.26 0.33 0.4
|I
OUT
| ≤ 5.2 mA 6.0V 0.26 0.33 0.4
I
IN
Maximum Input Current V
IN
= V
CC
or GND 5.0V 0.5 5.0 5.0 µA
(Pins 7, 15)
I
IN
Maximum Input Current V
IN
= V
CC
or GND 6.0V ±0.1 ±1.0 ±1.0 µA
(all other pins)
I
CC
Maximum Quiescent V
IN
= V
CC
or GND 6.0V 8.0 80 160 µA
Supply Current (standby) I
OUT
= 0 µA
I
CC
Maximum Active Supply V
IN
= V
CC
or GND 2.0V 36 80 110 130 µA
Current (per R/C
EXT
= 0.5V
CC
4.5V 0.33 1.0 1.3 1.6 mA
monostable) 6.0V 0.7 2.0 2.6 3.2 mA
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MM74HC423A
AC Electrical Characteristics
V
CC
= 5V, T
A
= 25°C, C
L
= 15 pF, t
r
= t
f
= 6 ns
AC Electrical Characteristics
C
L
= 50 pF t
r
= t
f
= 6 ns (Unless otherwise specified)
Note 6: C
PD
determines the no load dynamic power consumption, P
D
= C
PD
V
CC
2
f + I
CC
V
CC
, and the no load dynamic current consumption,
I
S
= C
PD
V
CC
f + I
CC
.
Symbol Parameter Conditions Typ
Guatanteed
Limit
Units
t
PLH
Maximum Trigger Propagation Delay, 22 33 ns
A, B to Q
t
PHL
Maximum Trigger Propagation Delay, 25 42 ns
A, B to Q
t
PHL
Maximum Propagation Delay, 20 27 ns
Clear to Q
t
PLH
Maximum Propagation Delay, 22 33 ns
Clear to Q
t
W
Minimum Pulse Width, A, B or Clear 14 26 ns
t
REM
Minimum Clear Removal Time 0 ns
t
WQ(MIN)
Minimum Output Pulse Width C
EXT
= 28 pF 400 ns
R
EXT
= 2 kΩ
t
WQ
Output Pulse Width C
EXT
= 1000 pF 10 µs
R
EXT
= 10 kΩ
Symbol Parameter Conditions
V
CC
T
A
= 25°CT
A
= −40 to 85°CT
A
= −55 to 125°C
Units
Typ Guaranteed Limits
t
PLH
Maximum Trigger Propagation 2.0V 77 169 194 210
nsDelay, A or B to Q 4.5V 26 42 51 57
6.0V 21 32 39 44
t
PHL
Maximum Trigger Propagation 2.0V 88 197 229 250
nsDelay, A or B to Q
4.5V 29 48 60 67
6.0V 24 38 46 51
t
PHL
Maximum Propagation 2.0V 54 114 132 143
nsDelay, Clear to Q 4.5V 23 34 41 45
6.0V 19 28 33 36
t
PLH
Maximum Propagation 2.0V 56 116 135 147
nsDelay, Clear to Q
4.5V 25 36 42 46
6.0V 20 29 34 37
t
W
Minimum Pulse Width 2.0V 57 123 144 157
nsA, B, Clear 4.5V 17 30 37 42
6.0V 12 21 27 30
t
REM
Minimum Clear 2.0V 0 0 0 0
nsRemoval Time 4.5V 0 0 0 0
6.0V 0 0 0 0
t
WQ
Output Pulse Width C
EXT
= 0.1 µF Min 5.0V 1 0.9 0.86 0.85 ms
R
EXT
= 10 kΩ
Max 5.0V 1 1.1 1.14 1.15 ms
t
TLH
, t
THL
Maximum Output Rise 2.0V 30 75 95 110
nsand Fall Time 4.5V 8 15 19 22
6.0V 7 13 16 19
C
PD
Power Dissipation 83 pF
Capacitance (Note 6)
C
IN
Maximum Input 12 20 20 20 pF
Capacitance (Pins 7 & 15)
C
IN
Maximum Input 6 10 10 10 pF
Capacitance (other inputs)
P1-P3P4-P6P7-P9P10-P10

MM74HC423AN

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Manufacturer:
ON Semiconductor / Fairchild
Description:
Monostable Multivibrator Dual Multivibrator
Lifecycle:
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