DM54123W Fairchild Semiconductor, DM54123W Datasheet

DM54123W

Manufacturer Part Number

DM54123W

Description

Manufacturer

Fairchild Semiconductor

Datasheet

1.DM54123W.pdf (8 pages)

Specifications of DM54123W

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DM74123

Dual Retriggerable One-Shot with Clear and

Complementary Outputs

General Description

The ’123 is a dual retriggerable monostable multivibrator ca-

pable of generating output pulses from a few nano-seconds

to extremely long duration up to 100% duty cycle. Each de-

vice has three inputs permitting the choice of either

leading-edge or trailing edge triggering. Pin (A) is an

active-low 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 trigger-

ing. 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

DS006539

Order Number DM54123J-MIL, DM54123W-MIL

See Package Number J16A, N16A or W16A

Dual-In-Line Package

or DM74123N

Features

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

n Retriggerable to 100% duty cycle

n Direct reset terminates output pulse

n Compensated for V

n DTL, TTL compatible

n Input clamp diodes

Functional Description

The basic output pulse width is determined by selection of an

external resistor (R

basic pulse width may be extended by retriggering the gated

active-low transition or active-high transition inputs or be re-

duced by use of the active-low transition clear input. Retrig-

gering to 100% duty cycle is possible by application of an in-

put pulse train whose cycle time is shorter than the output

cycle time such that a continuous “HIGH” logic state is main-

tained at the “Q” output.

transition inputs

) and capacitor (C

and temperature variations

DS006539-1

). Once triggered, the

www.fairchildsemi.com

March 1998

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DM54123W Summary of contents

Page 1

... 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 Order Number DM54123J-MIL, DM54123W-MIL See Package Number J16A, N16A or W16A © 1998 Fairchild Semiconductor Corporation DS006539 ...

Page 2

Triggering Truth Table www.fairchildsemi.com Inputs Response A B CLR Trigger Trigger Trigger Trigger Trigger Trigger H = HIGH Voltage ...

Page 3

Absolute Maximum Ratings Supply Voltage Input Voltage Operating Free Air Temperature Range Recommended Operating Conditions Symbol Parameter V Supply Voltage CC V High Level Input Voltage IH V Low Level Input Voltage IL I High Level Output Current OH I ...

Page 4

Switching Characteristics = 5V and T = 25˚ Symbol Parameter t Propagation Delay Time PLH Low to High Level Output t Propagation Delay Time PLH Low to High Level Output t Propagation Delay Time PHL High ...

Page 5

Operating Rules (Continued) 6. The retriggerable pulse width is calculated as shown be- low PLH X X The retriggered pulse width is equal to the pulse width ...

Page 6

6 ...

Page 7

Physical Dimensions inches (millimeters) unless otherwise noted Ceramic Dual-In-Line Package (J) Order Number DM54123J-MIL Package Number J16A Molded Dual-In-Line Package (N) Order Number DM74123N Package Number N16A 7 www.fairchildsemi.com ...

Page 8

... Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. 16-Lead Ceramic Flat Package (W) Order Number DM54123W-MIL Package Number W16A 2. A critical component in any component of a life support ...

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