IN74HC221A
D
UAL
M
ONOSTABLE
M
ULTIVIBRATOR
The IN74HC221A is identical in pinout to the LS/ALS221. The
device inputs are compatible with standard CMOS outputs; with
pullup resistors, they are compatible with LS/ALSTTL outputs.
There are two trigger inputs, A INPUT (negative edge) and
B INPUT (positive edge). These inputs are valid for rising/falling
signals
The device may also be triggered by using the RESET input
(positive-edge) because of the Schmitt-trigger input; after
triggering the output maintains the MONOSTABLE state for the
time period determined by the external resistor R
EXT
and
capacitor C
EXT
. Taking RESET low breaks this MONOSTABLE
STATE. If the next trigger pulse occurs during the
MONOSTABLE period it makes the MONOSTABLE period
longer.
Outputs Directly Interface to CMOS, NMOS, and TTL
Operating Voltage Range: 3.0 to 6.0 V
Low Input Current: 1.0
µA
High Noise Immunity Characteristic of CMOS Devices
LOGIC DIAGRAM
1A
D
EXT
C
EXT
R
EXT
C
EXT
D
EXT
R
EXT
N SUFFIX
PLASTIC
16
1
16
1
D SUFFIX
SOIC
•
•
•
•
ORDERING INFORMATION
IN74HC221AN Plastic
IN74HC221AD SOIC
IZ74HC221AZ Chip
T
A
= -55° to 125° C for all
packages
PIN ASSIGNMENT
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V CC
1R
EXT
/C
EXT
1C
EXT
1Q
2Q
2RESET
2B
2A
1B
1RESET
1Q
2Q
PIN 16 =V
CC
PIN 8 = GND
2C
EXT
2R
EXT
/C
EXT
GND
FUNCTION TABLE
A
Inputs
B
RESET
H
H
Outputs
Q
Q
Note
Output
Enable
Inhibit
Inhibit
Output
Enable
Output
Enable
Inhibit
Note
X
L
H
L
*
H
*
(1) C
EXT
, R
EXT
, D
EXT
are external components.
H
X
H
L
*
H
*
(2) D
EXT
is a clamping diode.
L
H
The external capacitor is charged to V
CC
in the stand-by
state, i.e. no trigger. When the supply voltage is turned off
L
H
C
X
is discharged mainly through an internal parasitic
diode. If C
X
is sufficiently large and V
CC
decreases rapidy,
X
X
L
L
H
there will be some possibility of damaging the I.C. with a X = don’t care
surge current or latch-up. If the voltage supply filter
*
- except for monostable period
capacitor is large enough and V
CC
decrease slowly, the
surge current is automatically limited and damage the I.C.
is avoided. The maximum forward current of the parasitic
diode is approximately 20 mA.
1
IN74HC221A
MAXIMUM RATINGS
*
Symbol
Parameter
Value
Unit
V
CC
DC Supply Voltage (Referenced to GND)
-0.5 to +7.0
V
V
IN
DC Input Voltage (Referenced to GND)
-1.5 to V
CC
+1.5
V
V
OUT
DC Output Voltage (Referenced to GND)
-0.5 to V
CC
+0.5
V
I
IN
DC Input Current, per Pin
mA
±20
A
,
B
,
RESET
±30
C
EXT
, R
EXT
I
OUT
DC Output Current, per Pin
mA
±25
I
CC
DC Supply Current, V
CC
and GND Pins
mA
±50
**
P
D
Power Dissipation in Still Air, Plastic DIP
750
mW
**
SOIC Package
500
Tstg
Storage Temperature
-65 to +150
°C
260
T
L
Lead Temperature, 1 mm from Case for 10
°C
Seconds
(Plastic DIP or SOIC Package)
*
Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
**
Derating - Plastic DIP: - 10 mW/°C from 65° to 125°C
SOIC Package: : - 7 mW/°C from 65° to 125°C
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
V
CC
DC Supply Voltage (Referenced to GND)
V
IN
, V
OUT
DC Input Voltage, Output Voltage (Referenced to
GND)
T
A
Operating Temperature, All Package Types
t
r
, t
f
Input Rise and Fall Time -
RESET
V
CC
=2.0 V
V
CC
=4.5 V
(Figure 2)
V
CC
=6.0 V
A
A
or
B
Min
3.0
*
0
-55
0
0
0
-
Max
6.0
V
CC
Unit
V
V
+125
°C
1000
ns
500
400
No
Limit
R
X
External Timing Resistor
V
CC
<4.5 V
10
1000
kΩ
2.0
1000
V
CC
≥
4.5 V
C
X
External Timing Capacitor
0
No
µF
Limit
*
The IN74HC221 will function at 2.0 V but for optimum pulse width stability, V
CC
should be above
3.0 V.
This device contains protection circuitry to guard against damage due to high static
voltages or electric fields. However, precautions must be taken to avoid applications of any voltage
higher than maximum rated voltages to this high-impedance circuit. For proper operation, V
IN
and
V
OUT
should be constrained to the range GND≤(V
IN
or V
OUT
)≤V
CC
.
Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or
V
CC
). Unused outputs must be left open.
2
IN74HC221A
DC ELECTRICAL CHARACTERISTICS(Voltages
Referenced to GND)
Guaranteed Limit
Symbol
Parameter
Test Conditions
V
CC
V
≤85
≤125
-55°C
to
°C
°C
25
°C
0.3
0.3
0.3
V
IL
Maximum Low - V
OUT
≤
0.1 V or 2.0
0.9
0.9
0.9
Level Input Voltage V
CC
=0.1
V 4.5
1.2
1.2
1.2
6.0
I
OUT
≤
20
µA
1.5
1.5
1.5
V
IH
Minimum High-Level V
OUT
≤
0.1 V or 2.0
3.15
3.15
3.15
Input Voltage
V
CC
=0.1
V 4.5
4.2
4.2
4.2
6.0
I
OUT
≤
20
µA
0.1
0.1
0.1
V
OL
Maximum Low-Level V
IN
=V
IH
or
V
IL
2.0
0.1
0.1
0.1
Output Voltage
4.5
I
OUT
≤
20
µA
0.1
0.1
0.1
6.0
V
IN
=V
IH
or
V
IL
4.5
0.26
0.33
0.4
I
OUT
≤
4.0 mA
V
IN
=V
IH
or
V
IL
6.0
0.26
0.33
0.40
I
OUT
≤
5.2 mA
1.9
1.9
1.9
V
OH
Minimum
High- V
IN
=V
IH
or V
IL
2.0
4.4
4.4
4.4
Level
Output
I
OUT
≤
-20
µA
4.5
5.9
5.9
5.9
Voltage
6.0
V
IN
=V
IH
or V
IL
4.5
3.98
3.84
3.70
I
OUT
≤
-4.0 mA
V
IN
=V
IH
or V
IL
6.0
5.48
5.34
5.2
I
OUT
≤
-5.2 mA
I
IL
Maximum
Low- V
IL
=GND
6.0
-0.1
-1.0
-1.0
Level
Output V
IH
=V
CC
Current
I
IH
Minimum
High- V
IL
=GND
6.0
0.1
1.0
1.0
Level Input Current V
IH
=V
CC
V
IL
=GND
6.0
8.0
80
160
I
CC
Maximum
Quiescent Supply V
IН
=V
CC
Current
(per I
OUT
=0
µA
Package) Standby
State
0.13
0.11
0.08
I
CC1
Maximum Supply V
IL
=GND
2.0
1.6
1.3
1.0
Current
(per V
IH
=V
CC
4.5
3.2
2.6
2.0
Package)
Active I
OUT
=0
µA
6.0
State
V
IN
= 0.5 V
CC
Unit
V
V
V
V
µA
µA
µA
mA
3
IN74HC221A
AC ELECTRICAL CHARACTERISTICS
Parameter
Symbol
Test
Conditions
V
CC
V
Guaranteed Limit
≤85
≤125
-55°C
to
°C
°C
25°C
180
225
270
36
45
54
31
38
46
180
225
270
36
45
54
31
38
46
195
245
295
39
49
59
33
42
50
220
44
37
245
49
42
200
40
34
75
16
14
10
20
275
55
47
305
61
52
250
50
43
95
20
17
10
20
180
*
330
66
56
370
74
63
300
60
51
110
22
20
10
20
Unit
t
PHL
Maximum
Propagation
Delay
A, B -
Q
RESET
- Q
RESET
-
Q
V
IL
=0
V
V
IH
=V
CC
t
LH
=t
HL
=6 ns
C
L
=50
pF
C
EXT
=0
R
EXT
=5 kΩ
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
-
5.0
ns
t
PLH
Maximum
Propagation
Delay
A, B - Q
RESET
- Q
RESET
-
Q
V
V
IL
=0
V
IH
=V
CC
t
LH
=t
HL
=6 ns
C
L
=50
pF
C
EXT
=0
R
EXT
=5 kΩ
ns
t
TLH
, t
THL
Maximum Output Transition
Time, Any Output(Figures 2
and 3)
V
IL
=0
V
V
IH
=V
CC
t
LH
=t
HL
=6
½с
C
L
=50 pF
ns
C
IN
C
PD
t
rec
t
w
t
WQ
Maximum
A
, B,
RESET
Input
C
X
, R
X
Capacitance
Power
Dissipation
Capacitance
(Per Multivibrator)
P
D
=C
PD
V
CC2
f+I
CC
V
CC
Minimum Recovery Time, V
IL
=0
V
Inactive
to
A
or
B V
IH
=V
CC
t
LH
=t
HL
=6
½с
(Figure 2)
C
L
=50 pF
Minimum
V
IL
=0
V
A,
RESET
Pulse Width
V
IH
=V
CC
t
LH
=t
HL
=6 ns
pF
C
L
=50
B
C
EXT
=0
R
EXT
=5 kΩ
Minimum
Pulse
Width
С
EXT
=0
пФ
(Figure 4)
R
EXT
=5 kΩ
С
EXT
=1 nF
R
EXT
=10 kΩ
С
EXT
=1
µF
R
EXT
=10 kΩ
pF
pF
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
5.0
2.0
4.5
6.0
2.0
4.5
6.0
100
20
17
25
9
7
30
11
9
125
25
21
95
19
16
115
23
20
105
*
0.80
*
0.75
*
0.70
*
80
*
75
*
70
*
150
30
26
110
22
19
135
27
23
ns
ns
ns
µs
*
Т
А
=25±10°C
4
IN74HC221A
Figure 1. Switching Waveforms
RESET
Figure 2. Switching Waveforms
Figure 3. Test Circuit
5
京公网安备 11010802033920号
EEWORLD
