74VHC123AMTC [ONSEMI]
双可重触发 Monastable 多谐振荡器;型号: | 74VHC123AMTC |
厂家: | ONSEMI |
描述: | 双可重触发 Monastable 多谐振荡器 时钟 PC 光电二极管 逻辑集成电路 振荡器 |
文件: | 总16页 (文件大小:582K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
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May 2007
74VHC123A
tm
Dual Retriggerable Monostable Multivibrator
Features
General Description
■ High Speed: t = 8.1ns (Typ.) at T = 25°C
The VHC123A 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 VHC123A can be
triggered on the positive transition of the clear while A is
held low and B is held high. The output pulse width is
PD
A
■ 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 74HC123A
determined by the equation: PW = (R )(C ); where PW
x
x
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, 5 kΩ 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
74VHC123AM
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
74VHC123ASJ
74VHC123AMTC
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 number.
©1993 Fairchild Semiconductor Corporation
74VHC123A Rev. 1.2
www.fairchildsemi.com
Connection Diagram
Logic Symbol
IEEE/IEC
Pin Description
Pin Names
Description
Truth Table
A
Trigger Inputs (Negative Edge)
Trigger Inputs (Positive Edge)
Reset Inputs
Inputs
Outputs
B
A
B
H
L
CLR
H
Q
Q
Function
Output Enable
Inhibit
CLR
C
R
External Capacitor
External Resistor
x
x
X
H
L
H
L
L
H
H
X
H
Inhibit
Q, Q
Outputs
H
Output Enable
Output Enable
Reset
L
H
X
X
L
L
H
H = HIGH Voltage Level
L = LOW Voltage Level
= HIGH-to-LOW Transition
= LOW-to-HIGH Transition
X = Don't Care
©1993 Fairchild Semiconductor Corporation
74VHC123A Rev. 1.2
www.fairchildsemi.com
2
Block Diagrams
Note A: C , R , D are external Capacitor, Resistor, and Diode, respectively.
x
x
x
Note B: External clamping diode, D ;
x
External capacitor is charged to V level in the wait state, i.e. when no trigger is applied.
CC
If the supply voltage is turned off, C discharges mainly through the internal (parasitic) diode. If C is sufficiently large
x
x
and V drops rapidly, there will be some possibility of damaging the IC through in rush current or latch-up. If the
CC
capacitance of the supply voltage filter is large enough and V drops slowly, the in rush current is automatically
CC
limited and damage to the IC is avoided.
The maximum value of forward current through the parasitic diode is 20mA. In the case of a large Cx, the limit of fall
time of the supply voltage is determined as follows:
t ≥ (V –0.7) C / 20mA
f
CC
x
(t is the time between the supply voltage turn off and the supply voltage reaching 0.4 V
)
f
CC
In the event a system does not satisfy the above condition, an external clamping diode (D ) is needed to protect the IC
x
from rush current.
©1993 Fairchild Semiconductor Corporation
74VHC123A Rev. 1.2
www.fairchildsemi.com
3
System Diagram
Timing Chart
©1993 Fairchild Semiconductor Corporation
74VHC123A Rev. 1.2
www.fairchildsemi.com
4
Functional Description
1. Stand-by State
the output Q goes LOW and C stops its operation.
2
That means, after triggering, when the voltage level
The external capacitor (C ) is fully charged to V in
x
CC
of the R /C node reaches V H, the IC returns to its
x
x
ref
the Stand-by State. That means, before triggering,
the Q and Q transistors which are connected to the
MONOSTABLE state.
P
N
R /C node are in the off state. Two comparators that
With large values of C and R , and ignoring the dis-
charge time of the capacitor and internal delays of
x
x
x
x
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 IC, the width of the output pulse, t (OUT), is as
W
follows:
2. Trigger Operation
t
(OUT) = 1.0 C R
x x
W
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.
3. Retrigger operation (74VHC123A)
When a new trigger is applied to either input A or B
while in the MONOSTABLE state, it is effective only if
the IC is charging C . The voltage level of the R /C
x
x
x
node then falls to V L level again. Therefore the Q
ref
output stays HIGH if the next trigger comes in before
the time period set by C and R .
After a trigger becomes effective, comparators C
1
x
x
and C start operating, and Q is turned on. The
2
N
If the new trigger is very close to a previous trigger,
such as an occurrence during the discharge cycle, it
will have no effect.
external capacitor discharges through Q . The volt-
N
age level at the R /C node drops. If the R /C volt-
x
x
x
x
age level falls to the internal reference voltage V L,
ref
the output of C becomes LOW. The flip-flop is then
The minimum time for a trigger to be effective 2nd
trigger, t (Min), depends on V and C .
1
reset and Q turns off. At that moment C stops but
N
1
RR
CC
x
C continues operating.
2
4. Reset Operation
After Q turns off, the voltage at the R /C node
N
x
x
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
reset. Also, Q turns on and C is charged rapidly to
starts rising at a rate determined by the time constant
of external capacitor C and resistor R .
x
x
Upon triggering, output Q becomes HIGH, following
some delay time of the internal F/F and gates. It stays
p
x
V
.
CC
HIGH even if the voltage of R /C changes from fall-
x
x
This means if CLR is set LOW, the IC goes into a wait
state.
ing to rising. When R /C reaches the internal refer-
x
x
ence voltage V H, the output of C becomes LOW,
ref
2
©1993 Fairchild Semiconductor Corporation
74VHC123A Rev. 1.2
www.fairchildsemi.com
5
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, C
No Limitation
F
x
(2)
External Resistor, R
>5kΩ (V = 2.0V)
x
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 C and R are a function of the leakage of capacitor C , the leakage of the device,
x
x
x
and leakage due to board layout and surface resistance. Susceptibility to externally induced noise signals may occur
for R > 1MΩ.
x
©1993 Fairchild Semiconductor Corporation
74VHC123A Rev. 1.2
www.fairchildsemi.com
6
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
= 5.5V or GND
µA
µA
IN
IN
IN
IN
R /C Terminal
5.5
5.5
= V or GND
0.25
4.0
2.50
40.0
x
x
CC
Off-State Current
I
I
Quiescent Supply
Current
V
V
= V or GND
µA
µA
CC
CC
IN
IN
CC
(3)
Active—State
3.0
4.5
5.5
= V or GND,
R /C = 0.5 V
160
380
560
250
500
750
280
650
975
CC
Supply Current
x
x
CC
Note:
3. Per circuit.
©1993 Fairchild Semiconductor Corporation
74VHC123A Rev. 1.2
www.fairchildsemi.com
7
(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
(A, B–Q, Q)
3.3 0.3 C = 15 pF
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
300
240
110
110
1.1
ns
ns
ns
ns
ns
ns
ns
µs
ms
%
PLH PHL
L
C = 50 pF
L
5.0 0.5 C = 15 pF
L
C = 50 pF
9.6
L
, t
Propagation Delay Time
(CLR Trigger—Q, Q)
3.3 0.3 C = 15 pF
14.5
17.0
8.7
PLH PHL
L
C = 50 pF
L
5.0 0.5 C = 15 pF
L
C = 50 pF
10.2
10.3
12.8
6.3
L
, t
Propagation Delay Time
(CLR—Q, Q)
3.3 0.3 C = 15 pF
L
PLH PHL
C = 50 pF
L
5.0 0.5 C = 15 pF
L
C = 50 pF
7.8
11.4
240
200
110
110
1.1
L
t
Output Pulse Width
3.3 0.3 C = 50pF, C = 28pF,
160
133
100
100
1.0
WOUT
L
x
R = 2kΩ
5.0 0.5
x
3.3 0.3 C = 50pF, C = 0.01µF,
90
90
90
90
L
x
R = 10kΩ
5.0 0.5
x
3.3 0.3 C = 50pF, C = 0.1µF,
0.9
0.9
0.9
0.9
L
x
R = 1kΩ
5.0 0.5
x
1.0
1.1
1.1
∆t
Output Pulse Width Error
Between Circuits
1
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 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
I
(opr.) = C • V • f
I
• Duty / 100 + I / 2 (per Circuit)
CC
PD
CC IN+ CC
CC
1
: Active Supply Current
CC
Duty: %
©1993 Fairchild Semiconductor Corporation
74VHC123A Rev. 1.2
www.fairchildsemi.com
8
(6)
AC Operating Requirement
T = –40°C
A
T = 25°C
to +85°C
A
Symbol
Parameter
V
(V)
Conditions
Min. Typ. Max. Min. Max. Units
CC
t (L), t (H) Minimum Trigger
3.3
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
ns
ns
ns
µs
W
W
Pulse Width
5.0
3.3
5.0
t (L)
Minimum Clear
Pulse Width
W
t
Minimum Retrigger
Time
3.3 0.3 R = 1kΩ,
60
39
RR
x
C
= 100pF
X
5.0 0.5
3.3
R = 1kΩ,
1.5
1.2
x
C
= 0.01µF
X
5.0
Note:
6. Refer to Timing Chart.
©1993 Fairchild Semiconductor Corporation
74VHC123A Rev. 1.2
www.fairchildsemi.com
9
Device Characteristics
t
*C Characteristics (Typ.)
t
*V Characteristics (Typ.)
wout
x
RR CC
Input Equivalent Circuit
Output Pulse Width Constant K-Supply Voltage
(Typ.)
©1993 Fairchild Semiconductor Corporation
74VHC123A Rev. 1.2
www.fairchildsemi.com
10
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
©1993 Fairchild Semiconductor Corporation
74VHC123A Rev. 1.2
www.fairchildsemi.com
11
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
©1993 Fairchild Semiconductor Corporation
74VHC123A Rev. 1.2
www.fairchildsemi.com
12
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
©1993 Fairchild Semiconductor Corporation
74VHC123A Rev. 1.2
www.fairchildsemi.com
13
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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
©1993 Fairchild Semiconductor Corporation
74VHC123A Rev. 1.2
www.fairchildsemi.com
14
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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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