Rev.3.00, Jul.16.2004, page 1 of 7

HD74BC574A

Octal D Type Flip Flops With 3 State Outputs

REJ03D0288–0300Z

(Previous ADE-205-042A (Z))

Rev.3.00

Jul.16.2004

Description

The HD74BC574A provides high drivability and operation equal to or better than high speed bipolar standard logic IC

by using Bi-CMOS process. The device features low power dissipation that is about 1/5 of high speed bipolar logic IC,

when the frequency is 10 MHz. The device has eight edge triger D type flip flops with three state outputs in a 20 pin

package. Data at the D inputs meeting set up requirements, are transferred to the Q outputs on positive going transitions

of the clock input. When the latch enable goes low, data at the D inputs will be retained at the outputs until latch enable

returns high again. When a high logic level is applied to the output control input, all outputs go to a high impedance

state, regardless of what signals are present at the other inputs and the state of the strage elements.

Features

• Input/Output are at high impedance state when power supply is off.

• Built in input pull up circuit can make input pins be open, when not used.

• TTL level input

• Wide operating temperature range

Ta = –40 to + 85°C

• Ordering Information

Part Name

Package Type

Package Code

Package

Abbreviation

Taping Abbreviation

(Quantity)

HD74BC574AFPEL

SOP-20 pin (JEITA) FP-20DAV

FP

EL (2,000 pcs/reel)

Function Table

Inputs

Output Control

CK

D

Output Q

L

HH

L

LL

LLX

Q

0

H

XXZ

H :

High level

L

:

Low level

X :

Immaterial

Z

:

High impedance

:

Low to high transition

Q

Level of Q before the indicated steady state input conditions were established.