Datasheet DM54123W-MIL, DM54123J-MIL Datasheet (NSC)

Page 1

March 1993

DM54123/DM74123 Dual Retriggerable One-Shot with Clear and Complementary Outputs

General Description

The ’123 is a dual retriggerable monostable multivibrator capable of generating output pulses from a few nano-seconds to extremely long duration up to 100% duty cycle. Each device has three inputs permitting the choice of either leading-edge or trailing edge triggering. Pin (A) is an activelow transition trigger input and pin (B) is an active-high transition trigger input. A low at the clear (CLR) input terminates the output pulse: which also inhibits triggering. An internal connection from CLR to the input gate makes it possible to trigger the circuit by a positive-going signal on CLR as shown in the truth table.

To obtain the best and trouble free operation from this device please read the operating rules as well as the NSC one–shot application notes carefully and observe recommendations.

Connection Diagram

Dual-In-Line Package

Features

DC triggered from active-high transition or active-low transition inputs

Retriggerable to 100% duty cycle

Direct reset terminates output pulse

Compensated for VCCand temperature variations

DTL, TTL compatible

Input clamp diodes

Functional Description

The basic output pulse width is determined by selection of an external resistor (R the basic pulse width may be extended by retriggering the gated active-low transition or active-high transition inputs or be reduced by use of the active-low transition clear input. Retriggering to 100% duty cycle is possible by application of an input pulse train whose cycle time is shorter than the output cycle time such that a continuous ‘‘HIGH’’ logic state is maintained at the ‘‘Q’’ output.

) and capacitor (CX). Once triggered,

Triggering Truth Table

Inputs

Response

A B CLR

X X L No Trigger

K L X No Trigger K H H Trigger

H L X No Trigger L L H Trigger LHLTrigger

HeHIGH Voltage Level

LOW Voltage Level

Immaterial

Order Number DM54123J-MIL, DM54123W-MIL or DM74123N

TL/F/6539– 1

See NS Package Number J16A, N16A or W16A

1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.

TL/F/6539

Page 2

Absolute Maximum Ratings (Note)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications.

Supply Voltage 7V

Input Voltage 5.5V

Operating Free Air Temperature Range

DM54 DM74 0

Storage Temperature

55§Ctoa100§C

Ctoa70§C

65§Ctoa150§C

Recommended Operating Conditions

Symbol Parameter

(Min) Pulse at Q (Note 5)

EXT

WIRE

Supply Voltage 4.5 5 5.5 4.75 5 5.25 V

High Level Input Voltage 2 2 V

Low Level Input Voltage 0.8 0.8 V

High Level Output Current

Low Level Output Current 16 16 mA

Pulse Width A or B High 40 (Note 5)

A or B Low 40 ns

Clear Low 40

Minimum Width of A or B

External Timing Resistor 5 50 kX

External Timing Capacitance No Restriction mF

Wiring Capacitance at R

EXT/CEXT

Terminal (Note 5)

Free Air Operating Temperature

The ‘‘Absolute Maximum Ratings’’ are those values

Note:

beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the ‘‘Electrical Characteristics’’ table are not guaranteed at the absolute maximum ratings. The ‘‘Recommended Operating Conditions’’ table will define the conditions for actual device operation.

DM54123 DM74123

Min Nom Max Min Nom Max

0.8

0.8 mA

80 65 ns

50 pF

55 125 0 70

Units

Electrical Characteristics

over recommended operating free air temperature range (unless otherwise noted)

Symbol Parameter Conditions Min

Note 1: All typicals are at V

Note 2: Not more than one output should be shorted at a time.

Note 3: Quiescent I

25 KX.

Note 4: I

Note 5: T

Input Clamp Voltage V

High Level Output V Voltage

Low Level Output V Voltage V

Input Current@Max V Input Voltage

High Level Input V Current V

Low Level Input Current V

Short Circuit V Output Current (Note 2)

Supply Current V

5V, T

is measured (after clearing) with 2.4V applied to all clear and A inputs, B inputs grounded, all outputs open,C

is measured in the triggered state with 2.4V applied to all clear and B inputs, A inputs grounded, all outputs open, C

25§C and V

5V.

25§C.

Min, I

Max, V

Min, I

Min, V

Max, V

Max Data 40

2.4V

Max, V

12 mA

Max DM54 2.4

Min DM74 2.5

Max

5.5V

Clear 80

0.4V Clear

Data

Max DM54

DM74

Max (Notes 3 and 4) 46 66 mA

Typ

(Note 1)

Max Units

1.5 V

3.4 V

0.2 0.4 V

1mA

3.2

1.6

EXT

0.02 mF, and R

EXT

25 kX.

EXT

Page 3

Switching Characteristics at V

Symbol Parameter

PLH

PHL

PLH

PHL

W(out)

Propagation Delay Time Low to High Level Output

Propagation Delay Time High to Low Level Output

Propagation Delay Time Low to High Level Output

Propagation Delay Time High to Low Level Output

Output Pulse Width* A or B to Q 3.08 3.76 3.08 3.76 ms

1000 pF, R

ECT

EXT

10 kX

From (Input)

To (Output)

B to Q 28 28 ns

BtoQ

Clear to Q

Clear

5V and T

25§C

DM54123 DM74123

15 pF, R

EXT

0 pF, R

400X C

5kX C

EXT

15 pF, R

1000 pF, R

EXT

400X

10 KX

Units

Min Max Min Max

to Q 33 33 ns

to Q 40 40 ns

36 36 ns

40 40 ns

to Q 27 27 ns

Operating Rules

1. An external resistor (RX) and external capacitor (CX) are required for proper operation. The value of C from 0 to any necessary value. For small time constants high-grade mica, glass, polypropylene, polycarbonate, or polystyrene material capacitors may be used. For large time constants use tantalum or special aluminum capacitors. If the timing capacitors have leakages approaching 100 nA or if stray capacitance from either terminal to ground is greater than 50 pF the timing equations may not represent the pulse width the device generates.

2. When an electrolytic capacitor is used for C diode is often required for standard TTL one-shots to prevent high inverse leakage current

(Figure 1).

use in general is not recommended with retriggerable operation.

3. The output pulse width (T as follows:

KRXCX(1a0.7/RX)

where[RXis in Kilo-ohm

[

CXis in pico Farad

[

TWis in nano second

[

K&0.28

]

) for C

]

FIGURE 1

may vary

a switching

However, its

1000 pF is defined

TL/F/6539– 3

4. For C

curves with R

1000 pF see

as a parameter:

Pulse Width vs R

Figure 2

for TWvs CXfamily

and C

TL/F/6539– 4

FIGURE 2

5. To obtain variable pulse width by remote trimming, the following circuit is recommended:

Note: ‘‘R

’’ should be as close to the one-shot as possible.

remote

FIGURE 3

TL/F/6539– 5

Page 4

Operating Rules (Continued)

6. The retriggerable pulse width is calculated as shown below:

PLH

The retriggered pulse width is equal to the pulse width plus a delay time period

FIGURE 4

KcR

(Figure 4).

PLH

TL/F/6539– 6

7. Under any operating condition C as close to the one-shot device pins as possible to minimize stray capacitance, to reduce noise pick-up, and to

reduce I

R and Ldi/dt voltage developed along their connecting paths. If the lead length from C and (7) or pins (14) and (15) is greater than 3 cm, for

and RXmust be kept

to pins (6)

example, the output pulse width might be quite different from values predicted from the appropriate equations. A non-inductive and low capacitive path is necessary to ensure complete discharge of C tion so that the output pulse width will be accurate.

8. V

and ground wiring should conform to good high-fre-

quency standards and practices so that switching transients on the V interaction between one-shots. A 0.01 mF to 0.10 mF by-

and ground return leads do not cause

pass capacitor (disk ceramic or monolithic type) from V to ground is necessary on each device. Furthermore, the bypass capacitor should be located as close to the V pin as space permits.

*For further detailed device characteristics and output performance please refer to the NSC one-shot application note, AN-366.

in each cycle of its opera-

Page 5

Physical Dimensions inches (millimeters)

Ceramic Dual-In-Line Package (J)

Order Number DM54123J-MIL

NS Package Number J16A

Molded Dual-In-Line Package (N)

Order Number DM74123N

NS Package Number N16A

Page 6

Physical Dimensions inches (millimeters) (Continued)

16-Lead Ceramic Flat Package (W)

Order Number DM54123W-MIL

NS Package Number W16A

LIFE SUPPORT POLICY

NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices or 2. A critical component is any component of a life systems which, (a) are intended for surgical implant support device or system whose failure to perform can into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life failure to perform, when properly used in accordance support device or system, or to affect its safety or with instructions for use provided in the labeling, can effectiveness. be reasonably expected to result in a significant injury to the user.

National Semiconductor National Semiconductor National Semiconductor National Semiconductor

DM54123/DM74123 Dual Retriggerable One-Shot with Clear and Complementary Outputs

Corporation Europe Hong Kong Ltd. Japan Ltd.

1111 West Bardin Road Fax: ( Arlington, TX 76017 Email: cnjwge@tevm2.nsc.com Ocean Centre, 5 Canton Rd. Fax: 81-043-299-2408 Tel: 1(800) 272-9959 Deutsch Tel: ( Fax: 1(800) 737-7018 English Tel: (

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

Fran3ais Tel: ( Italiano Tel: (

49) 0-180-530 85 86 13th Floor, Straight Block, Tel: 81-043-299-2309

49) 0-180-530 85 85 Tsimshatsui, Kowloon

49) 0-180-532 78 32 Hong Kong

49) 0-180-532 93 58 Tel: (852) 2737-1600

49) 0-180-534 16 80 Fax: (852) 2736-9960