FAIRCHILD 74VHC123AMX

74VHC123A
Dual Retriggerable Monostable Multivibrator
tm
Features
General Description
■ High Speed: tPD = 8.1ns (Typ.) at TA = 25°C
■ Low Power Dissipation: ICC = 4µA (Max) at TA = 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 maintaining the CMOS low power dissipation. Each multivibrator 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
determined by the equation: PW = (Rx)(Cx); where PW
is in seconds, R is in ohms, and C is in farads.
■ Active State: ICC = 600µA (Max.) at TA = 25°C
■ High Noise Immunity: VNIH = VNIL = 28% VCC (Min.)
■ Power down protection is provided on all inputs
■ Pin and function compatible with 74HC123A
Limits for Rx and Cx are:
External capacitor, Cx : No limit
External resistors, Rx: VCC = 2.0V, 5 kΩ min
VCC > 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 mismatched supply and input voltages.
Ordering Information
Order Number
74VHC123AM
74VHC123ASJ
74VHC123AMTC
Package
Number
Package Description
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow
M16D
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
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
74VHC123A Dual Retriggerable Monostable Multivibrator
May 2007
Logic Symbol
IEEE/IEC
Pin Description
Pin Names
Description
A
Trigger Inputs (Negative Edge)
B
Trigger Inputs (Positive Edge)
CLR
Reset Inputs
Cx
External Capacitor
Rx
External Resistor
Q, Q
Outputs
Truth Table
Inputs
A
Outputs
B
CLR
H
H
X
L
H
L
H
H
X
H
L
H
L
Q
Q
Output Enable
H
L
H
X
X
Function
Inhibit
Inhibit
Output Enable
Output Enable
L
L
H
Reset
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
74VHC123A Dual Retriggerable Monostable Multivibrator
Connection Diagram
Note A: Cx, Rx, Dx are external Capacitor, Resistor, and Diode, respectively.
Note B: External clamping diode, Dx;
External capacitor is charged to VCC level in the wait state, i.e. when no trigger is applied.
If the supply voltage is turned off, Cx discharges mainly through the internal (parasitic) diode. If Cx is sufficiently large
and VCC drops rapidly, there will be some possibility of damaging the IC through in rush current or latch-up. If the
capacitance of the supply voltage filter is large enough and VCC drops slowly, the in rush current is automatically
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:
tf ≥ (VCC –0.7) Cx / 20mA
(tf is the time between the supply voltage turn off and the supply voltage reaching 0.4 VCC)
In the event a system does not satisfy the above condition, an external clamping diode (Dx) is needed to protect the IC
from rush current.
©1993 Fairchild Semiconductor Corporation
74VHC123A Rev. 1.2
www.fairchildsemi.com
3
74VHC123A Dual Retriggerable Monostable Multivibrator
Block Diagrams
74VHC123A Dual Retriggerable Monostable Multivibrator
System Diagram
Timing Chart
©1993 Fairchild Semiconductor Corporation
74VHC123A Rev. 1.2
www.fairchildsemi.com
4
the output Q goes LOW and C2 stops its operation.
That means, after triggering, when the voltage level
of the Rx/Cx node reaches VrefH, the IC returns to its
MONOSTABLE state.
1. Stand-by State
The external capacitor (Cx) is fully charged to VCC in
the Stand-by State. That means, before triggering,
the QP and QN transistors which are connected to the
Rx/Cx node are in the off state. Two comparators that
relate to the timing of the output pulse, and two reference voltage supplies turn off. The total supply current is only leakage current.
With large values of Cx and Rx, and ignoring the discharge time of the capacitor and internal delays of
the IC, the width of the output pulse, tW (OUT), is as
follows:
tW (OUT) = 1.0 Cx Rx
2. Trigger Operation
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 signal; 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 Cx. The voltage level of the Rx/Cx
node then falls to VrefL level again. Therefore the Q
output stays HIGH if the next trigger comes in before
the time period set by Cx and Rx.
After a trigger becomes effective, comparators C1
and C2 start operating, and QN is turned on. The
external capacitor discharges through QN. The voltage level at the Rx/Cx node drops. If the Rx/Cx voltage level falls to the internal reference voltage VrefL,
the output of C1 becomes LOW. The flip-flop is then
reset and QN turns off. At that moment C1 stops but
C2 continues operating.
If the new trigger is very close to a previous trigger,
such as an occurrence during the discharge cycle, it
will have no effect.
The minimum time for a trigger to be effective 2nd
trigger, tRR (Min), depends on VCC and Cx.
4. Reset Operation
After QN turns off, the voltage at the Rx /Cx node
starts rising at a rate determined by the time constant
of external capacitor Cx and resistor Rx.
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, Qp turns on and Cx is charged rapidly to
VCC.
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 falling to rising. When Rx/Cx reaches the internal reference voltage VrefH, the output of C2 becomes LOW,
©1993 Fairchild Semiconductor Corporation
74VHC123A Rev. 1.2
This means if CLR is set LOW, the IC goes into a wait
state.
www.fairchildsemi.com
5
74VHC123A Dual Retriggerable Monostable Multivibrator
Functional Description
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
VCC
Supply Voltage
–0.5V to +7.0V
VIN
DC Input Voltage
–0.5V to +7.0V
VOUT
DC Output Voltage
–0.5V to VCC + 0.5V
IIK
Input Diode Current
–20mA
IOK
Output Diode Current
±20mA
IOUT
DC Output Current
±25mA
ICC
DC VCC / GND Current
±50mA
TSTG
TL
Storage Temperature
–65°C to +150°C
Lead Temperature (Soldering, 10 seconds)
260°C
Recommended Operating Conditions(1)
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
VCC
Supply Voltage
VIN
Input Voltage
VOUT
Output Voltage
TOPR
Operating Temperature
tr , tf
Rating
2.0V to +5.5V
0V to +5.5V
0V to VCC
–40°C to +85°C
Input Rise and Fall Time (CLR only)
VCC = 3.3V ± 0.3V
0ns/V ∼ 100ns/V
VCC = 5.0V ± 0.5V
0ns/V ∼ 20ns/V
No Limitation(2) F
External Capacitor, Cx
>5kΩ(2) (VCC = 2.0V)
External Resistor, Rx
>1kΩ(2) (VCC > 3.0V)
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 > 1MΩ.
©1993 Fairchild Semiconductor Corporation
74VHC123A Rev. 1.2
www.fairchildsemi.com
6
74VHC123A Dual Retriggerable Monostable Multivibrator
Absolute Maximum Ratings
TA = 25°C
Symbol
Parameter
VIH
HIGH Level Input
Voltage
VIL
LOW Level Input
Voltage
VOH
HIGH Level Output
Voltage
VCC (V)
Conditions
Min.
2.0
1.50
3.0–5.5
0.7 x VCC
3.0
LOW Level Output
Voltage
Min.
IOH = –50µA
2.0
1.9
2.9
3.0
2.9
4.4
4.5
4.4
IOH = –4mA
2.58
2.48
4.5
IOH = –8mA
3.94
3.80
3.0
VIN = VIH
or VIL
IOL = 50µA
4.5
3.0
4.5
V
0.0
0.1
0.1
0.0
0.1
0.1
0.0
IOL = 4mA
IOL = 8mA
V
0.3 x VCC
1.9
3.0
2.0
Units
V
0.50
0.3 x VCC
VIN = VIH
or VIL
Max.
0.7 x VCC
0.50
3.0–5.5
2.0
Max.
1.50
2.0
4.5
VOL
Typ.
TA = –40° to 85°C
0.1
0.1
0.36
0.44
V
0.36
0.44
0–5.5
VIN = 5.5V or GND
±0.1
±1.0
µA
Rx/Cx Terminal
Off-State Current
5.5
VIN = VCC or GND
±0.25
±2.50
µA
ICC
Quiescent Supply
Current
5.5
VIN = VCC or GND
4.0
40.0
µA
ICC
Active—State(3)
Supply Current
3.0
VIN = VCC or GND,
Rx/Cx = 0.5 VCC
160
250
280
µA
380
500
650
560
750
975
IIN
Input Leakage
Current
IIN
4.5
5.5
Note:
3. Per circuit.
©1993 Fairchild Semiconductor Corporation
74VHC123A Rev. 1.2
www.fairchildsemi.com
7
74VHC123A Dual Retriggerable Monostable Multivibrator
DC Electrical Characteristics
TA = –40°C
to +85°C
TA = 25°C
Symbol
Parameter
tPLH, tPHL Propagation Delay Time
(A, B–Q, Q)
VCC (V)
3.3 ± 0.3
5.0 ± 0.5
tPLH, tPHL Propagation Delay Time
(CLR Trigger—Q, Q)
3.3 ± 0.3
5.0 ± 0.5
tPLH, tPHL Propagation Delay Time
(CLR—Q, Q)
3.3 ± 0.3
5.0 ± 0.5
tWOUT
Output Pulse Width
3.3 ± 0.3
5.0 ± 0.5
3.3 ± 0.3
5.0 ± 0.5
3.3 ± 0.3
5.0 ± 0.5
∆tWOUT
Conditions
Min.
Typ.
Max.
Min.
Max. Units
CL = 15 pF
13.4
20.6
1.0
24.0
CL = 50 pF
15.9
24.1
1.0
27.5
CL = 15 pF
8.1
12.0
1.0
14.0
CL = 50 pF
9.6
14.0
1.0
16.0
CL = 15 pF
14.5
22.4
1.0
26.0
CL = 50 pF
17.0
25.9
1.0
29.5
CL = 15 pF
8.7
12.9
1.0
15.0
CL = 50 pF
10.2
14.9
1.0
17.0
CL = 15 pF
10.3
15.8
1.0
18.5
CL = 50 pF
12.8
19.3
1.0
22.0
CL = 15 pF
6.3
9.4
1.0
11.0
CL = 50 pF
7.8
11.4
1.0
13.0
CL = 50pF, Cx = 28pF,
Rx = 2kΩ
160
240
300
133
200
CL = 50pF, Cx = 0.01µF,
Rx = 10kΩ
90
100
110
90
110
90
100
110
90
110
CL = 50pF, Cx = 0.1µF,
Rx = 1kΩ
0.9
1.0
1.1
0.9
1.1
0.9
1.0
1.1
0.9
1.1
Output Pulse Width Error
Between Circuits
(In same Package)
CIN
Input Capacitance
VCC = Open
Power Dissipation
Capacitance
(5)
4
73
ns
ns
ns
ns
ns
ns
240
±1
CPD
ns
µs
ms
%
10
10
pF
pF
Notes:
4. Refer to Timing Chart.
5. CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current
consumption without load. Average operating current can be obtained by the equation:
ICC (opr.) = CPD • VCC • fIN+ ICC1 • Duty / 100 + ICC / 2 (per Circuit)
ICC1: Active Supply Current
Duty: %
©1993 Fairchild Semiconductor Corporation
74VHC123A Rev. 1.2
www.fairchildsemi.com
8
74VHC123A Dual Retriggerable Monostable Multivibrator
AC Electrical Characteristics(4)
TA = 25°C
Symbol
tW(L), tW(H)
tW(L)
tRR
Parameter
VCC (V)
Conditions
Min.
Typ.
Max.
TA = –40°C
to +85°C
Min.
Minimum Trigger
3.3
5.0
5.0
Pulse Width
5.0
5.0
5.0
Minimum Clear
Pulse Width
3.3
5.0
5.0
5.0
5.0
5.0
Minimum Retrigger
Time
3.3 ± 0.3
5.0 ± 0.5
3.3
5.0
Rx = 1kΩ,
CX = 100pF
60
Rx = 1kΩ,
CX = 0.01µF
1.5
Max.
Units
ns
ns
ns
39
µs
1.2
Note:
6. Refer to Timing Chart.
©1993 Fairchild Semiconductor Corporation
74VHC123A Rev. 1.2
www.fairchildsemi.com
9
74VHC123A Dual Retriggerable Monostable Multivibrator
AC Operating Requirement(6)
twout*Cx Characteristics (Typ.)
tRR*VCC Characteristics (Typ.)
Output Pulse Width Constant K-Supply Voltage
(Typ.)
Input Equivalent Circuit
©1993 Fairchild Semiconductor Corporation
74VHC123A Rev. 1.2
www.fairchildsemi.com
10
74VHC123A Dual Retriggerable Monostable Multivibrator
Device Characteristics
74VHC123A Dual Retriggerable Monostable Multivibrator
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
74VHC123A Dual Retriggerable Monostable Multivibrator
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
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
74VHC123A Dual Retriggerable Monostable Multivibrator
Physical Dimensions (Continued)
Dimensions are in millimeters unless otherwise noted.
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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
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.
2. A critical component in any component of a life support,
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
Advance Information
Formative or In Design
This datasheet contains the design specifications for product
development. Specifications may change in any manner without notice.
Definition
Preliminary
First 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
Full Production
This datasheet contains final specifications. Fairchild Semiconductor
reserves the right to make changes at any time without notice to improve
design.
Obsolete
Not In Production
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
74VHC123A Dual Retriggerable Monostable Multivibrator
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