54LS379 datasheet(3/6 Pages) NSC

Teilenummer	54LS379

Bauteilbeschribung	Quad Parallel Register with Enable

PDF	6 Pages

Scroll/Zoom	100%

Hersteller	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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3 / 6 page

Switching Characteristics

VCC ea50V TA ea25 C (See Section 1 for test waveforms and output load)

Symbol

Parameter

RL e 2kX CL e 15 pF

Units

Min

Max

fmax

Maximum Clock Frequency

MHz

tPLH

Propagation Delay

tPHL

CP to Qn

Functional Description

The LS379 consists of four edge-triggered D-type flip-flops

with individual D inputs and Q and Q outputs The Clock

(CP) and Enable (E) inputs are common to all flip-flops

When the E input is HIGH the register will retain the present

data independent of the CP input The Dn and E inputs can

change when the clock is in either state provided that the

recommended setup and hold times are observed

Truth Table

Inputs

Outputs

Change

H e HIGH Voltage Level

L e LOW Voltage Level

X e Immaterial

Logic Diagram

TLF10186 – 3

54LS379 Datenblatt(PDF) 3 Page - National Semiconductor (TI)