HIT HD74BC574A Datasheet

HD74BC574A

Octal D Type Flip Flops With 3 State Outputs

ADE-205-042 (Z)

Rev. 0

June 1993

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

HD74BC574A

Function Table

Inputs
Output Control CK D Output Q

L HH
L LL
LLXQ

HX X Z
H : High level

L : Low level
X : Immaterial
Z : High impedance

: Low to high transition
: Level of Q before the indicated steady state input conditions were established.

Q

0

Pin Arrangement

0

Output
Control

1D
2D
3D
4D
5D
6D
7D
8D

GND

1
2
3
4
5
6

7

8

9

10

(Top view)

20
19
18
17
16
15
14
13
12
11

V
1Q

2Q
3Q
4Q
5Q
6Q

7Q

8Q
CK

CC

2

HD74BC574A

Absolute Maximum Ratings

Item Symbol Rating Unit

Supply voltage V
Input diode current I
Input voltage V
Output voltage V
Off state output voltage V

CC

IK

IN

OUT

OUT(off)

Storage temperature Tstg –65 to +150 °C
Note: 1. The absolute maximum ratings are values which must not individually be exceeded, and

furthermore, no two of which may be realized at the same time.

Recommended Operating Conditions

Item Symbol Min Typ Max Unit

Supply voltage V
Input voltage V
Output voltage V

CC

IN

OUT

Operating temperature Topr –40 — 85 °C
Input rise/fall time*

1

tr, t

f

Note: 1. This item guarantees maximum limit when one input switches.

Waveform: Refer to test circuit of switching characteristics.

4.5 5.0 5.5 V
0—VCCV
0—VCCV

0 — 8 ns/V

–0.5 to +7.0 V
±30 mA
–0.5 to +7.5 V
–0.5 to +7.5 V
–0.5 to +5.5 V

3