Fairchild 74VHC221A service manual

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74VHC221A Dual Non-Retriggerable Monostable Multivibrator

May 2007

74VHC221A Dual Non-Retriggerable Monostable Multivibrator

Features

■

High Speed: t Low Power Dissipation: I

■

Active State: I

■

High Noise Immunity: V Power down protection is provided on all inputs

■

Pin and function compatible with 74HC221A

8.1ns (Typ.) at V

PD

CC

600µA (Max.) at T

CC

NIH

5V

CC

4µA (Max.) at T

A

V

28% V

NIL

25°C

CC

25°C

A

(Min.)

General Description

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 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 VHC221A can be triggered on the positive transition of the clear while A is held LOW and B is held HIGH. The VHC221A is nonretriggerable, and therefore cannot be retriggered until the output pulse times out. 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.

Limits for R

External capacitor, C External resistors, R

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.

and C

x

are:

x

: No limit

x

:V

x

CC

V

CC

2.0V, 5k Ω Min.

3.0V, 1 k Ω Min

Ordering Information

Package

Order Number

74VHC221AM M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow 74VHC221ASJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 74VHC221AMTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm

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

Number Package Description

Wide

H =

≥

74VHC221A Dual Non-Retriggerable Monostable Multivibrator

Connection Diagram

Logic Symbol

IEEE/IEC

Block Diagrams

Note A: Cx, Rx, Dx are external Capacitor, Resistor, and

Diode, respectively.

Note B: External clamping diode, Dx;

External capacitor is charged to V

level in the wait

CC

state, i.e. when no trigger is applied.

Truth Table

Inputs Outputs

FunctionA B CLR QQ

HH Output Enable

X LHLHInhibit

HX HLHInhibit

LH Output Enable LH Output Enable XX LLHReset

HIGH Voltage Level

L = LOW Voltage Level

= HIGH-to-LOW Transition = LOW-to-HIGH Transition

If the supply voltage is turned off, Cx discharges mainly through the internal (parasitic) diode. If Cx is sufficiently large and V

drops rapidly, there will be some possibil-

CC

ity of damaging the IC through in rush current or latchup. If the capacitance of the supply voltage filter is large enough and V

drops slowly, the in rush current is

CC

automatically limited and damage to the IC is avoided. 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:

t

(V

f

(t supply voltage reaching 0.4 V

– 0.7) Cx / 20mA

CC

is the time between the supply voltage turn off and the

f

CC

)

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.

X = Don’t Care

System Diagram

74VHC221A Dual Non-Retriggerable Monostable Multivibrator

Timing Chart

Functional Description

1. Stand-by State The external capacitor (Cx) is fully charged to V

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

and Q

P

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.

2. Trigger Operation Trigger operation is effective in any of the following

three cases. First, the condition where the A 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 HIGH, and the CLR

After a trigger becomes effective, comparators C1 and C2 start operating, and Q external capacitor discharges through Q age level at the Rx/Cx node drops. If the Rx/Cx voltage level falls to the internal reference voltage V the output of C1 becomes LOW. The flip-flop is then reset and Q C2 continues operating.

After Q starts rising at a rate determined by the time constant of external capacitor Cx and resistor Rx.

transistors which are connected to the

N

input is LOW and the B input has a rising signal.

is turned on. The

N

turns off. At that moment C1 stops but

N

turns off, the voltage at the Rx/Cx node

N

. The volt-

N

CC

input is

ref

Upon triggering, output Q becomes HIGH, following

in

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 V 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 MONOSTABLE state.

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, t follows:

t

W

3. Reset Operation In normal operation, the CLR

CLR output is held LOW and the trigger control F/F is reset. Also, Q

L,

V

CC

This means if CLR state.

H, the output of C2 becomes LOW,

ref

H, the IC returns to its

ref

(OUT), is as

W

(OUT) = 1.0 Cx Rx

input is held HIGH. If

is LOW, a trigger has no affect because the Q

turns on and Cx is charged rapidly to

p

.

is set LOW, the IC goes into a wait

74VHC221A Dual Non-Retriggerable Monostable Multivibrator

=

> 5k

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

I

OUT

I

T

CC

IN

OUT

I

IK

OK

CC

STG

T

Supply Voltage –0.5V to +7.0V DC Input Voltage –0.5V to +7.0V DC Output Voltage –0.5V to V Input Diode Current –20mA Output Diode Current ±20mA DC Output Current ±25mA DC V

/ GND Current ±50mA

CC

Storage Temperature –65°C to +150°C Lead Temperature (Soldering, 10 seconds) 260°C

L

CC

+ 0.5V

=

> 1k

>

74VHC221A Dual Non-Retriggerable Monostable Multivibrator

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 Rating

V

CC

V

IN

V

OUT

T

OPR

t

, t

r

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 M Ω .

Supply Voltage 2.0V to +5.5V Input Voltage 0V to +5.5V Output Voltage 0V to V Operating Temperature –40°C to +85°C Input Rise and Fall Time (CLR only)

f

V

CC

V

CC

3.3V ± 0.3V

5.0V ± 0.5V

0ns/V ∼ 100ns/V

0ns/V ∼ 20ns/V External Capacitor, Cx No Limitation External Resistor, Rx

(2)

Ω

(2)

Ω

(V

CC

(2)

2.0V)

3.0V)

F

DC Electrical Characteristics

Symbol Parameter V

V

HIGH Level Input

IH

Voltage

V

LOW Level Input

IL

Voltage

V

HIGH Level

OH

Output Voltage

V

LOW Level

OL

Output Voltage

I

Input Leakage

IN

Current

I

Rx/Cx Terminal

IN

Off-State Current

I

Quiescent Supply

CC

Current

I

CC

Active—State

(3)

Supply Current

Note:

3. Per circuit.

(V) Conditions

CC

2.0 1.50 1.50 V

3.0–5.5 0.7 x V

2.0 0.50 0.50 V

3.0–5.5 0.3 x V

2.0 VIN = V or 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

2.0 VIN = V or 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

0–5.5 VIN = 5.5V or GND ±0.1 ±1.0 µA

5.5 VIN = VCC or GND ±0.25 ±2.50 µA

5.5 VIN = VCC or GND 4.0 40.0 µA

3.0 VIN = VCC or GND, Rx/Cx = 0.5 V

4.5 380 500 650

5.5 560 750 975

T

25°C T

A

CC

IOH = –50µA 1.9 2.0 1.9 V

IH

IL

IOL = 50µA 0.0 0.1 0.1 V

IH

IL

–40° to 85°C

A

0.7 x V

CC

160 250 280 µA

CC

0.3 x V

CC

=

74VHC221A Dual Non-Retriggerable Monostable Multivibrator

UnitsMin. Typ. Max. Min. Max.

74VHC221A Dual Non-Retriggerable Monostable Multivibrator

AC Electrical Characteristics

Symbol Parameter V

t

, t

Propagation Delay Time

PHL

(A, B–Q, Q

, t

Propagation Delay Time

PHL

(CLR Trigger—Q, Q

, t

Propagation Delay Time

PHL

(CLR—Q, Q

)

Output Pulse Width 2.0 CX = 28pF, CL = 50pF,

t

PLH

t

WOUT

(4)

= –40°C

T

A

= 25°C

T

A

(V) Conditions

CC

3.3 ± 0.3 C

5.0 ± 0.5 C

3.3 ± 0.3 C

5.0 ± 0.5 C

3.3 ± 0.3 C

5.0 ± 0.5 C

= 15pF 13.4 20.6 1.0 24.0 ns

L

= 50pF 15.9 24.1 1.0 27.5

C

L

= 15pF 8.1 12.0 1.0 14.0 ns

L

= 50pF 9.6 14.0 1.0 16.0

C

L

= 15pF 14.5 22.4 1.0 26.0 ns

L

= 50pF 17.0 25.9 1.0 29.5

C

L

= 15pF 8.7 12.9 1.0 15.0 ns

L

= 50pF 10.2 14.9 1.0 17.0

C

L

= 15pF 10.3 15.8 1.0 18.5 ns

L

= 50pF 12.8 19.3 1.0 22.0

C

L

= 15pF 6.3 9.4 1.0 11.0 ns

L

= 50pF 7.8 11.4 1.0 13.0

C

L

415

= 6kΩ

R

3.3 ± 0.3 345 ns

X

to +85°C

UnitsMin. Typ. Max. Min. Max.

5.0 ± 0.5 312

∆t

wOUT

Output Pulse Width Error

3.3 ± 0.3 C

5.0 ± 0.5 133 200 240

3.3 ± 0.3 C

5.0 ± 0.5 90 100 110 90 110

3.3 ± 0.3 C

5.0 ± 0.5 0.9 1.0 1.1 0.9 1.1

= 50pF, Cx = 28pF,

L

Rx = 2kΩ

= 50pF,

L

Cx = 0.01µF, Rx = 10kΩ

= 50pF, Cx = 0.1µF,

L

Rx = 10kΩ

0.9 1.0 1.1 0.9 1.1 ms

160 240 300 ns

90 100 110 90 110 µs

±1 % Between Circuits (In same Package)

C

Input Capacitance VCC = Open 4 10 10 pF

IN

C

Power Dissipation

PD

(5)

73 pF Capacitance

Notes:

4. Refer to 74VHC221A 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:

(opr.) = CPD • VCC • f

I

CC

1

: Active Supply Current

I

CC

IN + ICC

1

• Duty / 100 + I

/ 2 (per Circuit)

CC

Duty: %

AC Operating Requirement

TA = 25°C TA = –40°C to +85°C

Symbol Parameter V

tW(L) Minimum Trigger 3.3 5.0 5.0 ns

t

(H) Pulse Width 5.0 5.0 5.0

W

t

(L) Minimum Clear Pulse Width 3.3 5.0 5.0 ns

W

(V)

CC

5.0 5.0 5.0

UnitsMin. Typ. Max. Min. Max.

Device Characteristics

t

wout*Cx

74VHC221A Dual Non-Retriggerable Monostable Multivibrator

Characteristics (Typ.)

Output Pulse Width Constant K-Supply Voltage (Typical)

Input Equivalent Circuit

Physical Dimensions

Dimensions are in millimeters unless otherwise noted.

74VHC221A Dual Non-Retriggerable Monostable Multivibrator

Figure 1. 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow

Package Number M16A

Physical Dimensions (Continued)

Dimensions are in millimeters unless otherwise noted.

74VHC221A Dual Non-Retriggerable Monostable Multivibrator

Figure 2. 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

Package Number M16D

Physical Dimensions (Continued)

Dimensions are in millimeters unless otherwise noted.

5.00±0.10

4.55

74VHC221A Dual Non-Retriggerable Monostable Multivibrator

5.90

7.354.45

0.11

4.4±0.1

0.65

1.45

5.00

12°

MTC16rev4

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

Package Number MTC16

TRADEMARKS

The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks.

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74VHC221A Dual Non-Retriggerable Monostable Multivibrator

DISCLAIMER

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

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.

provided in the labeling, can be reasonably expected to result in a significant injury of the user.

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

First Production

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

Fairchild 74VHC221A service manual

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