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PDF 74HC4538 Data sheet ( Hoja de datos )
| Número de pieza | 74HC4538 | |
| Descripción | Dual retriggerable precision monostable multivibrator | |
| Fabricantes | Fairchild | |
| Logotipo |  |
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February 1984
Revised August 2000
MM74HC4538
Dual Retriggerable Monostable Multivibrator
General Description
The MM74HC4538 high speed monostable multivibrator
(one shots) is implemented in advanced silicon-gate
CMOS technology. They feature speeds comparable to low
power Schottky TTL circuitry while retaining the low power
and high noise immunity characteristic of CMOS circuits.
Each multivibrator features both a negative, A, and a posi-
tive, B, transition triggered input, either of which can be
used as an inhibit input. Also included is a clear input that
when taken low resets the one shot. The MM74HC4538 is
retriggerable. That is, it may be triggered repeatedly while
their outputs are generating a pulse and the pulse will be
extended.
Pulse width stability over a wide range of temperature and
supply is achieved using linear CMOS techniques. The out-
put pulse equation is simply: PW = 0.7(R)(C) where PW is
in seconds, R is in ohms, and C is in farads. This device is
pin compatible with the CD4528, and the CD4538 one
shots. All inputs are protected from damage due to static
discharge by diodes to VCC and ground.
Features
s Schmitt trigger on A and B inputs
s Wide power supply range: 2–6V
s Typical trigger propagation delay: 32 ns
s Fanout of 10 LS-TTL loads
s Low input current: 1 µA max
Ordering Code:
Order Number Package Number
Package Description
MM74HC4538M
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
MM74HC4538SJ
M16D
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
MM74HC4538N
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Truth Table
Inputs
Clear
A
LX
XH
XX
HL
H↑
H = HIGH Level
L = LOW Level
↑ = Transition from LOW-to-HIGH
↓ = Transition from HIGH-to-LOW
= One HIGH Level Pulse
= One LOW Level Pulse
X = Irrelevant
B
X
X
L
↓
H
Outputs
QQ
LH
LH
L
H
© 2000 Fairchild Semiconductor Corporation DS005217
www.fairchildsemi.com
1 page  
Absolute Maximum Ratings(Note 1)
(Note 2)
Recommended Operating
Conditions
Supply Voltage (VCC)
DC Input Voltage (VIN)
DC Output Voltage (VOUT)
Clamp Diode Current (IIK, IOK)
DC Output Current, per pin (IOUT)
DC VCC or GND Current, per pin (ICC)
Storage Temperature Range (TSTG)
Power Dissipation (PD)
(Note 3)
S.O. Package only
Lead Temperature (TL)
(Soldering 10 seconds)
−0.5 to +7.0V
−1.5 to VCC +1.5V
−0.5 to VCC +0.5V
±20 mA
±25 mA
±50 mA
−65°C to +150°C
600 mW
500 mW
260°C
Min Max Units
Supply Voltage (VCC)
DC Input or Output Voltage
(VIN, VOUT)
Operating Temperature Range (TA)
Input Rise or Fall Times
2
0
−40
6
VCC
+85
V
V
°C
(Reset only)
(tr, tf) VCC = 2.0V
1000 ns
VCC = 4.5V
500 ns
VCC = 6.0V
400 ns
Note 1: Maximum Ratings are those values beyond which damage to the
device may occur.
Note 2: Unless otherwise specified all voltages are referenced to ground.
Note 3: Power Dissipation Temperature Derating: Plastic “N” Package: −
12mW/°C from 65°C to 85°C.
DC Electrical Characteristics (Note 4)
Symbol
Parameter
Conditions
VCC
TA = 25°C
TA = −40 to 85°C TA = −55 to 125°C
Units
Typ Guaranteed Limits
VIH Minimum HIGH Level Input
Voltage
2.0V
4.5V
1.5
3.15
1.5
3.15
1.5
3.15
V
V
6.0V
4.2 4.2
4.2 V
VIL Maximum LOW Level Input
Voltage
2.0V
4.5V
0.5
1.35
0.5
1.35
0.5
1.35
V
V
6.0V
1.8 1.8
1.8 V
VOH
Minimum HIGH Level Output VIN = VIH or VIL
Voltage
|IOUT| ≤ 20 µA
2.0V
4.5V
2.0
4.5
1.9
4.4
1.9
4.4
1.9 V
4.4 V
6.0V
6.0
5.9
5.9
5.9 V
VIN = VIH or VIL
|IOUT| ≤ 4.0 mA
|IOUT| ≤ 5.2 mA
VOL Maximum LOW Level Output VIN = VIH or VIL
Voltage
|IOUT| ≤ 20 µA
4.5V
6.0V
2.0V
4.5V
6.0V
0
0
0
3.98
5.48
0.1
0.1
0.1
3.84
5.34
0.1
0.1
0.1
3.7 V
5.2 V
0.1 V
0.1 V
0.1 V
VIN = VIH or VIL
|IOUT| ≤ 4.0 mA
|IOUT| ≤ 5.2 mA
IIN
Maximum Input Current
VIN = VCC or GND
(Pins 2, 14) (Note 5)
4.5V
6.0V
6.0V
0.26
0.26
±0.1
0.33
0.33
±1.0
0.4
0.4
±1.0
V
V
µA
IIN
Maximum Input Current
VIN = VCC or GND
(all other pins)
6.0V
±0.1
±1.0
±1.0
µA
ICC
Active
Maximum Active Supply
Current
Pins 2, 14 = 0.5 VCC
Q1, Q2 = HIGH
6.0V
150 250
400 µA
ICC Maximum Quiescent Supply
Quiescent Current
VIN = VCC or GND
Pins 2, 14 = OPEN
Q1, Q2 = LOW
6.0V
130 220
350 µA
VIN = VCC or GND
Note 4: For a power supply of 5V ±10% the worst case output voltages (VOH, and VOL) occur for HC at 4.5V. Thus the 4.5V values should be used when
designing with this supply. Worst case VIH and VIL occur at VCC = 5.5V and 4.5V respectively. (The VIH value at 5.5V is 3.85V.) The worst case leakage cur-
rent (IIN, ICC, and IOZ) occur for CMOS at the higher voltage and so the 6.0V values should be used.
5 www.fairchildsemi.com
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