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74VHC123A Dual Retriggerable Monostable Multivibrator

May 2007

74VHC123A Rev. 1.2

74VHC123A

Dual Retriggerable Monostable Multivibrator

Features

■

High Speed: t

8.1ns (Typ.) at T

25°C

■

Low Power Dissipation: I

4µA (Max) at T

25°C

■

Active State: I

600µA (Max.) at T

25°C

■

High Noise Immunity: V

NIH

NIL

28% V

(Min.)

■

Power down protection is provided on all inputs

■

Pin and function compatible with 74HC123A

General Description

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

determined by the equation: PW

)(C

); where PW

is in seconds, R is in ohms, and C is in farads.

Limits for R

and C

are:

External capacitor, C

: No limit

External resistors, R

2.0V, 5 k

Ω

min

3.0V, 1 k

Ω

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

Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the

ordering number.

Order Number

Package

Number Package Description

74VHC123AM M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow

74VHC123ASJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

74VHC123AMTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm

Wide

74VHC123A Dual Retriggerable Monostable Multivibrator

74VHC123A Rev. 1.2 2

Connection Diagram

Pin Description

Logic Symbol

IEEE/IEC

Truth Table

HIGH Voltage Level

LOW Voltage Level

HIGH-to-LOW Transition

LOW-to-HIGH Transition

Don't Care

Pin Names Description

ATrigger Inputs (Negative Edge)

BTrigger Inputs (Positive Edge)

CLR Reset Inputs

External Capacitor

External Resistor

Q, Q Outputs

Inputs Outputs

FunctionA B CLR QQ

HH Output Enable

XLHLHInhibit

HX HLHInhibit

LH Output Enable

XX LLHReset

74VHC123A Dual Retriggerable Monostable Multivibrator

74VHC123A Rev. 1.2 3

Block Diagrams

Note A:

, R

, D

are external Capacitor, Resistor, and Diode, respectively.

Note B:

External clamping diode, D

;

External capacitor is charged to V

level in the wait state, i.e. when no trigger is applied.

If the supply voltage is turned off, C

discharges mainly through the internal (parasitic) diode. If C

is sufficiently large

and V

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 V

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:

≥

–0.7) C

/ 20mA

is the time between the supply voltage turn off and the supply voltage reaching 0.4 V

)

In the event a system does not satisfy the above condition, an external clamping diode (D

) is needed to protect the IC

from rush current.

74VHC123A Dual Retriggerable Monostable Multivibrator

74VHC123A Rev. 1.2 4

System Diagram

Timing Chart

74VHC123A Dual Retriggerable Monostable Multivibrator

74VHC123A Rev. 1.2 5

Functional Description

1. Stand-by State

The external capacitor (C

) is fully charged to V

the Stand-by State. That means, before triggering,

the Q

and Q

transistors which are connected to the

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.

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 sig-

nal; and third, where the A input is LOW and the B

input is HIGH, and the CLR input has a rising signal.

After a trigger becomes effective, comparators C

and C

start operating, and Q

is turned on. The

external capacitor discharges through Q

. The volt-

age level at the R

node drops. If the R

volt-

age level falls to the internal reference voltage V

ref

the output of C

becomes LOW. The flip-flop is then

reset and Q

turns off. At that moment C

stops but

continues operating.

After Q

turns off, the voltage at the R

node

starts rising at a rate determined by the time constant

of external capacitor C

and resistor R

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 R

changes from fall-

ing to rising. When R

reaches the internal refer-

ence voltage V

ref

H, the output of C

becomes LOW,

the output Q goes LOW and C

stops its operation.

That means, after triggering, when the voltage level

of the R

node reaches V

ref

H, the IC returns to its

MONOSTABLE state.

With large values of C

and R

, and ignoring the dis-

charge time of the capacitor and internal delays of

the IC, the width of the output pulse, t

(OUT), is as

follows:

(OUT)

1.0 C

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

node then falls to V

ref

L level again. Therefore the Q

output stays HIGH if the next trigger comes in before

the time period set by C

and R

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, t

(Min), depends on V

and C

4. Reset Operation

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

This means if CLR is set LOW, the IC goes into a wait

state.

74VHC123A Dual Retriggerable Monostable Multivibrator

74VHC123A Rev. 1.2 6

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.

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.

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.

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 Storage Temperature –65°C to +150°C

TL Lead Temperature (Soldering, 10 seconds) 260°C

Symbol Parameter Rating

VCC Supply Voltage 2.0V to +5.5V

VIN Input Voltage 0V to +5.5V

VOUT Output Voltage 0V to VCC

TOPR Operating Temperature –40°C to +85°C

tr, tf Input Rise and Fall Time (CLR only)

CC = 3.3V ± 0.3V

CC = 5.0V ± 0.5V

0ns/V ∼ 100ns/V

0ns/V ∼ 20ns/V

External Capacitor, CxNo Limitation(2) F

External Resistor, Rx>5kΩ(2) (VCC = 2.0V)

>1kΩ(2) (VCC > 3.0V)

74VHC123A Dual Retriggerable Monostable Multivibrator

74VHC123A Rev. 1.2 7

DC Electrical Characteristics

Note:

3. Per circuit.

Symbol Parameter VCC (V) Conditions

TA = 25°C TA = –40° to 85°C

UnitsMin. Typ. Max. Min. Max.

VIH HIGH Level Input

Voltage

2.0 1.50 1.50 V

3.0–5.5 0.7 x VCC 0.7 x VCC

VIL LOW Level Input

Voltage

2.0 0.50 0.50 V

3.0–5.5 0.3 x VCC 0.3 x VCC

VOH HIGH Level Output

Voltage

2.0 VIN = VIH

or VIL

IOH = –50µA 1.9 2.0 1.9 V

3.0 2.9 3.0 2.9

4.5 4.4 4.5 4.4

3.0 IOH = –4mA 2.58 2.48

4.5 IOH = –8mA 3.94 3.80

VOL LOW Level Output

Voltage

2.0 VIN = VIH

or VIL

IOL = 50µA 0.0 0.1 0.1 V

3.0 0.0 0.1 0.1

4.5 0.0 0.1 0.1

3.0 IOL = 4mA 0.36 0.44

4.5 IOL = 8mA 0.36 0.44

IIN Input Leakage

Current

0–5.5 VIN = 5.5V or GND ±0.1 ±1.0 µA

IIN 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

4.5 380 500 650

5.5 560 750 975

74VHC123A Dual Retriggerable Monostable Multivibrator

74VHC123A Rev. 1.2 8

AC Electrical Characteristics(4)

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: %

Symbol Parameter VCC (V) Conditions

TA = 25°C

TA = –40°C

to +85°C

UnitsMin. Typ. Max. Min. Max.

tPLH, tPHL Propagation Delay Time

(A, B–Q, Q)

3.3 ± 0.3 CL = 15 pF 13.4 20.6 1.0 24.0 ns

CL = 50 pF 15.9 24.1 1.0 27.5

5.0 ± 0.5 CL = 15 pF 8.1 12.0 1.0 14.0 ns

CL = 50 pF 9.6 14.0 1.0 16.0

tPLH, tPHL Propagation Delay Time

(CLR Tr igger—Q, Q)

3.3 ± 0.3 CL = 15 pF 14.5 22.4 1.0 26.0 ns

CL = 50 pF 17.0 25.9 1.0 29.5

5.0 ± 0.5 CL = 15 pF 8.7 12.9 1.0 15.0 ns

CL = 50 pF 10.2 14.9 1.0 17.0

tPLH, tPHL Propagation Delay Time

(CLR—Q, Q)

3.3 ± 0.3 CL = 15 pF 10.3 15.8 1.0 18.5 ns

CL = 50 pF 12.8 19.3 1.0 22.0

5.0 ± 0.5 CL = 15 pF 6.3 9.4 1.0 11.0 ns

CL = 50 pF 7.8 11.4 1.0 13.0

tWOUT Output Pulse Width 3.3 ± 0.3 CL = 50pF, Cx = 28pF,

Rx = 2kΩ

160 240 300 ns

5.0 ± 0.5 133 200 240

3.3 ± 0.3 CL = 50pF, Cx = 0.01µF,

Rx = 10kΩ

90 100 110 90 110 µs

5.0 ± 0.5 90 100 110 90 110

3.3 ± 0.3 CL = 50pF, Cx = 0.1µF,

Rx = 1kΩ

0.9 1.0 1.1 0.9 1.1 ms

5.0 ± 0.5 0.9 1.0 1.1 0.9 1.1

∆tWOUT Output Pulse Width Error

Between Circuits

(In same Package)

±1 %

CIN Input Capacitance VCC = Open 4 10 10 pF

CPD Power Dissipation

Capacitance

(5) 73 pF

74VHC123A Dual Retriggerable Monostable Multivibrator

74VHC123A Rev. 1.2 9

AC Operating Requirement(6)

Note:

6. Refer to Timing Chart.

Symbol Parameter VCC (V) Conditions

TA = 25°C

TA = –40°C

to +85°C

UnitsMin. Typ. Max. Min. Max.

tW(L), tW(H) Minimum Trigger

Pulse Width

3.3 5.0 5.0 ns

5.0 5.0 5.0

tW(L) Minimum Clear

Pulse Width

3.3 5.0 5.0 ns

5.0 5.0 5.0

tRR Minimum Retrigger

Time

3.3 ± 0.3 Rx = 1kΩ,

CX = 100pF

60 ns

5.0 ± 0.5 39

3.3 Rx = 1kΩ,

CX = 0.01µF

1.5 µs

5.0 1.2

74VHC123A Dual Retriggerable Monostable Multivibrator

74VHC123A Rev. 1.2 10

Device Characteristics

twout*Cx Characteristics (Typ.)

Output Pulse Width Constant K-Supply Voltage

(Typ.)

tRR*VCC Characteristics (Typ.)

Input Equivalent Circuit

74VHC123A Dual Retriggerable Monostable Multivibrator

74VHC123A Rev. 1.2 11

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

74VHC123A Dual Retriggerable Monostable Multivibrator

74VHC123A Rev. 1.2 12

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

74VHC123A Dual Retriggerable Monostable Multivibrator

74VHC123A Rev. 1.2 13

Physical Dimensions (Continued)

Dimensions are in millimeters unless otherwise noted.

Figure 3. 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

Package Number MTC16

0.65

4.4±0.1

MTC16rev4

0.11

4.55

5.00

5.00±0.10

12°

7.354.45

1.45

5.90

74VHC123A Dual Retriggerable Monostable Multivibrator

74VHC123A Rev. 1.2 14

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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

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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:

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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 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 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

First 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

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ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.

ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent

coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein.

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

arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.

Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards,

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

in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized

application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and

expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such

claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This

literature is subject to all applicable copyright laws and is not for resale in any manner.

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