74VHC221ASJ [ONSEMI]
Monostable Multivibrator;
| 型号： | 74VHC221ASJ |
| 厂家： | 
ONSEMI |
| 描述： | Monostable Multivibrator 时钟 光电二极管 逻辑集成电路 |
| 文件： | 总14页 (文件大小：584K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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May 2007
74VHC221A
tm
Dual Non-Retriggerable Monostable Multivibrator
Features
General Description
■ High Speed: t = 8.1ns (Typ.) at V = 5V
The VHC221A is an advanced high speed CMOS
Monostable Multivibrator fabricated with silicon gate
CMOS technology. It achieves the high speed operation
similar to equivalent Bipolar Schottky TTL while main-
taining the CMOS low power dissipation. Each multi-
vibrator features both a negative, A, and a positive, 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 VHC221A can be
triggered on the positive transition of the clear while A is
held LOW and B is held HIGH. The VHC221A is non-
retriggerable, and therefore cannot be retriggered until
the output pulse times out. The output pulse width is
determined by the equation:
PD
CC
■ Low Power Dissipation: I = 4µA (Max.) at T = 25°C
CC
A
■ Active State: I = 600µA (Max.) at T = 25°C
CC
A
■ High Noise Immunity: V
= V
= 28% V (Min.)
NIH
NIL CC
■ Power down protection is provided on all inputs
■ Pin and function compatible with 74HC221A
PW = (Rx)(Cx)
where,
PW is in seconds, R is in ohms, and C is in farads.
Limits for R and C are:
x
x
External capacitor, C : No limit
x
External resistors, R : V = 2.0V, 5kΩ Min.
x
CC
CC
V
> 3.0V, 1 kΩ Min
An input protection circuit ensures that 0 to 7V can be
applied to the input pins without regard to the supply
voltage. This device can be used to interface 5V to 3V
systems and two supply systems such as battery back
up. This circuit prevents device destruction due to mis-
matched supply and input voltages.
Ordering Information
Package
Order Number
74VHC221AM
Number
Package Description
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74VHC221ASJ
74VHC221AMTC
M16D
MTC16
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm
Wide
Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the
ordering code.
©1994 Fairchild Semiconductor Corporation
74VHC221A Rev. 1.2
www.fairchildsemi.com
Connection Diagram
Block Diagrams
Logic Symbol
IEEE/IEC
Note A: Cx, Rx, Dx are external Capacitor, Resistor, and
Diode, respectively.
Note B: External clamping diode, Dx;
External capacitor is charged to V
state, i.e. when no trigger is applied.
level in the wait
CC
Truth Table
If the supply voltage is turned off, Cx discharges mainly
through the internal (parasitic) diode. If Cx is sufficiently
Inputs
Outputs
large and V drops rapidly, there will be some possibil-
CC
A
B
H
L
CLR
H
Q
Q
Function
Output Enable
Inhibit
ity of damaging the IC through in rush current or latch-
up. If the capacitance of the supply voltage filter is large
enough and V
drops slowly, the in rush current is
CC
X
H
L
H
L
L
H
H
automatically limited and damage to the IC is avoided.
X
H
Inhibit
The maximum value of forward current through the para-
sitic diode is 20 mA. In the case of a large Cx, the limit
of fall time of the supply voltage is determined as follows:
H
Output Enable
Output Enable
Reset
L
H
X
t ≥ (V – 0.7) Cx / 20mA
X
L
L
H
f
CC
(t is the time between the supply voltage turn off and the
H = HIGH Voltage Level
L = LOW Voltage Level
f
supply voltage reaching 0.4 V
)
CC
In the event a system does not satisfy the above condi-
tion, an external clamping diode (Dx) is needed to
protect the IC from rush current.
= HIGH-to-LOW Transition
= LOW-to-HIGH Transition
X = Don’t Care
©1994 Fairchild Semiconductor Corporation
74VHC221A Rev. 1.2
www.fairchildsemi.com
2
System Diagram
Timing Chart
©1994 Fairchild Semiconductor Corporation
74VHC221A Rev. 1.2
www.fairchildsemi.com
3
Functional Description
1. Stand-by State
Upon triggering, output Q becomes HIGH, following
some delay time of the internal F/F and gates. It stays
HIGH even if the voltage of Rx/Cx changes from fall-
ing to rising. When Rx/Cx reaches the internal refer-
The external capacitor (Cx) is fully charged to V in
the Stand-by State. That means, before triggering,
CC
the Q and Q transistors which are connected to the
P
N
ence voltage V H, the output of C2 becomes LOW,
ref
Rx/Cx node are in the off state. Two comparators that
relate to the timing of the output pulse, and two refer-
ence voltage supplies turn off. The total supply cur-
rent is only leakage current.
the output Q goes LOW and C2 stops its operation.
That means, after triggering, when the voltage level
of the Rx/Cx node reaches V H, the IC returns to its
ref
MONOSTABLE state.
2. Trigger Operation
With large values of Cx and Rx, and ignoring the dis-
charge time of the capacitor and internal delays of
Trigger operation is effective in any of the following
three cases. First, the condition where the A input is
LOW, and B input has a rising signal; second, where
the B input is HIGH, and the A input has a falling sig-
nal; and third, where the A input is LOW and the B
input is HIGH, and the CLR input has a rising signal.
the IC, the width of the output pulse, t (OUT), is as
W
follows:
t
(OUT) = 1.0 Cx Rx
W
3. Reset Operation
After a trigger becomes effective, comparators C1
In normal operation, the CLR input is held HIGH. If
CLR is LOW, a trigger has no affect because the Q
output is held LOW and the trigger control F/F is
and C2 start operating, and Q is turned on. The
N
external capacitor discharges through Q . The volt-
N
age level at the Rx/Cx node drops. If the Rx/Cx volt-
reset. Also, Q turns on and Cx is charged rapidly to
p
age level falls to the internal reference voltage V L,
V
.
ref
CC
the output of C1 becomes LOW. The flip-flop is then
This means if CLR is set LOW, the IC goes into a wait
state.
reset and Q turns off. At that moment C1 stops but
N
C2 continues operating.
After Q turns off, the voltage at the Rx/Cx node
N
starts rising at a rate determined by the time constant
of external capacitor Cx and resistor Rx.
©1994 Fairchild Semiconductor Corporation
74VHC221A Rev. 1.2
www.fairchildsemi.com
4
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Symbol
Parameter
Rating
V
Supply Voltage
–0.5V to +7.0V
–0.5V to +7.0V
CC
V
DC Input Voltage
DC Output Voltage
Input Diode Current
Output Diode Current
DC Output Current
IN
V
–0.5V to V + 0.5V
OUT
CC
I
–20mA
20mA
IK
I
OK
I
25mA
OUT
I
DC V / GND Current
50mA
CC
CC
T
Storage Temperature
–65°C to +150°C
260°C
STG
T
Lead Temperature (Soldering, 10 seconds)
L
(1)
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to absolute maximum ratings.
Symbol
Parameter
Rating
V
Supply Voltage
2.0V to +5.5V
0V to +5.5V
0V to V
CC
V
Input Voltage
IN
V
Output Voltage
OUT
CC
T
Operating Temperature
–40°C to +85°C
OPR
t , t
Input Rise and Fall Time (CLR only)
r
f
V
V
= 3.3V 0.3V
= 5.0V 0.5V
0ns/V 100ns/V
CC
CC
0ns/V 20ns/V
(2)
External Capacitor, Cx
External Resistor, Rx
No Limitation
F
(2)
>5kΩ (V = 2.0V)
CC
(2)
>1kΩ
(V > 3.0V)
CC
Notes:
1. Unused inputs must be held HIGH or LOW. They may not float.
2. The maximum allowable values of Cx and Rx are a function of the leakage of capacitor Cx, the leakage of the device,
and leakage due to board layout and surface resistance.
Susceptibility to externally induced noise signals may occur for Rx > 1 MΩ.
©1994 Fairchild Semiconductor Corporation
74VHC221A Rev. 1.2
www.fairchildsemi.com
5
DC Electrical Characteristics
T = 25°C
T = –40° to 85°C
A
A
Symbol
Parameter
V
(V)
Conditions
Min.
Typ.
Max.
Min.
Max.
Units
CC
2.0
V
HIGH Level Input
Voltage
1.50
1.50
V
IH
3.0–5.5
2.0
0.7 x V
0.7 x V
CC
CC
V
LOW Level Input
Voltage
0.50
0.50
V
V
IL
3.0–5.5
2.0
0.3 x V
0.3 x V
CC
CC
V
HIGH Level
Output Voltage
V
or V
= V
I
= –50µA
1.9
2.9
2.0
3.0
4.5
1.9
2.9
OH
IN
IH
OH
IL
3.0
4.5
4.4
4.4
3.0
I
I
I
= –4mA
= –8mA
= 50µA
2.58
3.94
2.48
3.80
OH
OH
OL
4.5
V
LOW Level
Output Voltage
2.0
V
or V
= V
IH
0.0
0.0
0.0
0.1
0.1
0.1
0.1
V
OL
IN
IL
3.0
4.5
0.1
0.1
3.0
I
I
= 4mA
= 8mA
0.36
0.36
0.1
0.44
0.44
1.0
OL
OL
4.5
I
I
Input Leakage
Current
0–5.5
V
V
V
V
= 5.5V or GND
µA
µA
µA
µA
IN
IN
IN
IN
IN
IN
Rx/Cx Terminal
Off-State Current
5.5
5.5
= V or GND
0.25
4.0
2.50
40.0
CC
I
I
Quiescent Supply
Current
= V or GND
CC
CC
CC
(3)
Active—State
3.0
4.5
5.5
= V or GND,
Rx/Cx = 0.5 V
160
380
560
250
500
750
280
650
975
CC
Supply Current
CC
Note:
3. Per circuit.
©1994 Fairchild Semiconductor Corporation
74VHC221A Rev. 1.2
www.fairchildsemi.com
6
(4)
AC Electrical Characteristics
TA = –40°C
TA = 25°C
to +85°C
Symbol
Parameter
VCC (V)
Conditions
Min. Typ. Max. Min. Max. Units
t
t
t
, t
Propagation Delay Time 3.3 0.3 C = 15pF
13.4
15.9
8.1
20.6
24.1
12.0
14.0
22.4
25.9
12.9
14.9
15.8
19.3
9.4
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
24.0
27.5
14.0
16.0
26.0
29.5
15.0
17.0
18.5
22.0
11.0
13.0
ns
ns
ns
ns
ns
ns
PLH PHL
L
(A, B–Q, Q)
C = 50pF
L
5.0 0.5 C = 15pF
L
C = 50pF
9.6
L
, t
Propagation Delay Time 3.3 0.3 C = 15pF
14.5
17.0
8.7
PLH PHL
L
(CLR Trigger—Q, Q)
C = 50pF
L
5.0 0.5 C = 15pF
L
C = 50pF
10.2
10.3
12.8
6.3
L
, t
Propagation Delay Time 3.3 0.3 C = 15pF
PLH PHL
L
(CLR—Q, Q)
C = 50pF
L
5.0 0.5 C = 15pF
L
C = 50pF
7.8
11.4
L
t
Output Pulse Width
2.0
C
R
= 28pF, C = 50pF,
= 6kΩ
415
345
312
160
133
100
100
WOUT
X
X
L
3.3 0.3
5.0 0.5
ns
ns
µs
3.3 0.3 C = 50pF, Cx = 28pF,
240
200
110
110
300
240
110
110
L
Rx = 2kΩ
5.0 0.5
3.3 0.3 C = 50pF,
90
90
90
90
L
Cx = 0.01µF,
Rx = 10kΩ
5.0 0.5
3.3 0.3 C = 50pF, Cx = 0.1µF,
0.9
0.9
1.0
1.0
1
1.1
1.1
0.9
0.9
1.1
1.1
ms
%
L
Rx = 10kΩ
5.0 0.5
∆t
Output Pulse Width Error
Between Circuits
wOUT
(In same Package)
C
Input Capacitance
V
= Open
4
10
10
pF
pF
IN
CC
(5)
C
Power Dissipation
Capacitance
73
PD
Notes:
4. Refer to 74VHC221A Timing Chart.
5. C is defined as the value of the internal equivalent capacitance which is calculated from the operating current
PD
consumption without load. Average operating current can be obtained by the equation:
1
I
(opr.) = C • V • f
I
• Duty / 100 + I / 2 (per Circuit)
CC
CC
PD
CC IN + CC
CC
1
I
: Active Supply Current
Duty: %
AC Operating Requirement
T = 25°C
T = –40°C to +85°C
A
A
Symbol
Parameter
V
(V) Min.
Typ. Max.
Min.
5.0
Max.
Units
CC
t (L)
Minimum Trigger
3.3
5.0
5.0
5.0
5.0
5.0
ns
W
t (H)
Pulse Width
5.0
W
t (L)
Minimum Clear Pulse Width
3.3
5.0
5.0
ns
W
5.0
©1994 Fairchild Semiconductor Corporation
74VHC221A Rev. 1.2
www.fairchildsemi.com
7
Device Characteristics
t
*C Characteristics (Typ.)
x
wout
Output Pulse Width Constant K-Supply Voltage (Typical)
Input Equivalent Circuit
©1994 Fairchild Semiconductor Corporation
74VHC221A Rev. 1.2
www.fairchildsemi.com
8
Physical Dimensions
Dimensions are in millimeters unless otherwise noted.
Figure 1. 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
Package Number M16A
©1994 Fairchild Semiconductor Corporation
74VHC221A Rev. 1.2
www.fairchildsemi.com
9
Physical Dimensions (Continued)
Dimensions are in millimeters unless otherwise noted.
Figure 2. 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Package Number M16D
©1994 Fairchild Semiconductor Corporation
74VHC221A Rev. 1.2
www.fairchildsemi.com
10
Physical Dimensions (Continued)
Dimensions are in millimeters unless otherwise noted.
5.00 0.10
4.55
5.90
4.45 7.35
0.65
4.4 0.1
1.45
5.00
0.11
12°
MTC16rev4
Figure 3. 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Package Number MTC16
©1994 Fairchild Semiconductor Corporation
74VHC221A Rev. 1.2
www.fairchildsemi.com
11
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FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS
HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE
APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER
ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD’S
WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR
SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION.
As used herein:
1. Life support devices or systems are devices or systems 2. A critical component in any component of a life support,
which, (a) are intended for surgical implant into the body or
(b) support or sustain life, and (c) whose failure to perform
when properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to
result in a significant injury of the user.
device, or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification
Product Status
Definition
Advance Information
Formative or In Design
This datasheet contains the design specifications for product
development. Specifications may change in any manner without notice.
Preliminary
First Production
Full Production
Not In Production
This datasheet contains preliminary data; supplementary data will be
published at a later date. Fairchild Semiconductor reserves the right to
make changes at any time without notice to improve design.
No Identification Needed
Obsolete
This datasheet contains final specifications. Fairchild Semiconductor
reserves the right to make changes at any time without notice to improve
design.
This datasheet contains specifications on a product that has been
discontinued by Fairchild Semiconductor. The datasheet is printed for
reference information only.
Rev. I26
©1994 Fairchild Semiconductor Corporation
74VHC221A Rev. 1.2
www.fairchildsemi.com
12
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ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability
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regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer
application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not
designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification
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