MOTOROLA MC74ACT574DT, MC74ACT574DTEL, MC74ACT574DTR2, MC74ACT574MEL, MC74ACT574ML1 Datasheet

Octal D Type Flip Flop with 3 State Outputs

The MC74AC574/74ACT574 is a high-speed, low power octal flip-flop with a buffered common Clock (CP) and a buffered common Output Enable (OE). The information presented to the D inputs is stored in the flip-flops on the LOW-to-HIGH Clock (CP) transition.

The MC74AC574/74ACT574 is functionally identical to the MC74AC374/ 74ACT374 except for the pinouts.

•Inputs and Outputs on Opposite Sides of Package Allowing Easy Interface with Microprocessors

•Useful as Input or Output Port for Microprocessors

•Functionally Identical to MC74AC374/74ACT374

•3-State Outputs for Bus-Oriented Applications

•Outputs Source/Sink 24 mA

•′ACT574 Has TTL Compatible Inputs

VCC			O0		O1		O2		O3		O4		O5		O6		O7		CP
	20		19		18		17		16		15		14		13		12		11

1

2

3

4

5

6

7

8

9

10

D0

D1

D2

D3

D4

D5

D6

D7

GND

OE

PIN NAMES

D0±D7

Data Inputs

CP

Clock Pulse Input

OE

3-State Output Enable Input

O0±O7

3-State Outputs

MC74AC57

MC74ACT574

OCTAL D-TYPE FLIP-FLOP WITH 3-STATE OUTPUTS

N SUFFIX

CASE 738-03

PLASTIC

DW SUFFIX

CASE 751D-04

PLASTIC

LOGIC SYMBOL

D0 D1 D2 D3 D4 D5 D6 D7 CP

OE

O0 O1 O2 O3 O4 O5 O6 O7

FACT DATA

5-1

MC74AC57 MC74ACT574

FUNCTIONAL DESCRIPTION

The MC74AC574/74ACT574 consists of eight edgetriggered flip-flops with individual D-type inputs and 3-state true outputs. The buffered clock and buffered Output Enable are common to all flip-flops. The eight flip-flops will store the state of their individual D inputs that meet the setup and hold time requirements on the LOW-to-HIGH Clock (CP) transition. With the Output Enable (OE) LOW, the contents of the eight flip-flops are available at the outputs. When OE is HIGH, the outputs go to the high impedance state. Operation of the OE input does not affect the state of the flip-flops.

FUNCTION TABLE

		Inputs					Internal	Outputs	Function
	OE	CP				D	Q	On
	H		H			L	NC	Z	Hold
	H		H			H	NC	Z	Hold
	H					L	L	Z	Load
	H					H	H	Z	Load
	L					L	L	L	Data Available
	L					H	H	H	Data Available
	L		H			L	NC	NC	No Change in Data
	L		H			H	NC	NC	No Change in Data

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

Z = High Impedance

= LOW-to-HIGH Clock Transition

NC = No Change

LOGIC DIAGRAM

D0

D1

D2

D3

D4

D5

D6

D7

CP

C

D

C

D

C

D

C

D

C

D

C

D

C

D

C

D

Q

Q

Q

Q

Q

Q

Q

Q

OE

O0

O1

O2

O3

O4

O5

O6

O7

Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.

FACT DATA

5-2

MC74AC57 MC74ACT574

MAXIMUM RATINGS*

Symbol	Parameter	Value	Unit
VCC	DC Supply Voltage (Referenced to GND)	±0.5 to +7.0	V
Vin	DC Input Voltage (Referenced to GND)	±0.5 to VCC +0.5	V
Vout	DC Output Voltage (Referenced to GND)	±0.5 to VCC +0.5	V
Iin	DC Input Current, per Pin	±20	mA
Iout	DC Output Sink/Source Current, per Pin	±50	mA
ICC	DC VCC or GND Current per Output Pin	±50	mA
Tstg	Storage Temperature	±65 to +150	°C

*Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions.

RECOMMENDED OPERATING CONDITIONS

	Symbol	Parameter		Min	Typ	Max	Unit
	VCC	Supply Voltage	′AC	2.0	5.0	6.0	V
			′ACT	4.5	5.0	5.5
	Vin, Vout	DC Input Voltage, Output Voltage (Ref. to GND)		0		VCC	V
		Input Rise and Fall Time (Note 1)	VCC @ 3.0 V		150
	tr, tf		VCC @ 4.5 V		40		ns/V
		′AC Devices except Schmitt Inputs
			VCC @ 5.5 V		25
	tr, tf	Input Rise and Fall Time (Note 2)	VCC @ 4.5 V		10		ns/V
		′ACT Devices except Schmitt Inputs	VCC @ 5.5 V		8.0
	TJ	Junction Temperature (PDIP)				140	°C
	TA	Operating Ambient Temperature Range		±40	25	85	°C
	IOH	Output Current Ð High				±24	mA
	IOL	Output Current Ð Low				24	mA

1.Vin from 30% to 70% VCC; see individual Data Sheets for devices that differ from the typical input rise and fall times.

2.Vin from 0.8 V to 2.0 V; see individual Data Sheets for devices that differ from the typical input rise and fall times.

FACT DATA

5-3