ST M74HCT273 User Manual

M74HCT273

OCTAL D TYPE FLIP FLOP WITH CLEAR

■HIGH SPEED :

fMAX = 80 MHz (TYP.) at VCC = 4.5V

■LOW POWER DISSIPATION: ICC =4μA(MAX.) at TA=25°C

■COMPATIBLE WITH TTL OUTPUTS : VIH = 2V (MIN.) VIL = 0.8V (MAX)

■SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 4mA (MIN)

■BALANCED PROPAGATION DELAYS: tPLH tPHL

■PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 273

DESCRIPTION

DIP		SOP	TSSOP
ORDER CODES
PACKAGE		TUBE	T & R
DIP		M74HCT273B1R
SOP		M74HCT273M1R	M74HCT273RM13TR
TSSOP			M74HCT273TTR

The M74HCT273 is an high speed CMOS OCTAL D TYPE FLIP FLOP WITH CLEAR fabricated with silicon gate C2MOS technology.

Information signals applied to D inputs are transferred to the Q outputs on the positive-going edge of the clock pulse.

When the CLEAR input is held low, the Q output are in the low logic level independent of the other inputs.

All inputs are equipped with protection circuits against static discharge and transient excess voltage.

PIN CONNECTION AND IEC LOGIC SYMBOLS

August 2001

1/10

M74HCT273

	INPUT AND OUTPUT EQUIVALENT CIRCUIT		PIN DESCRIPTION
			PIN No	SYMBOL	NAME AND FUNCTION
			1	CLEAR	Master Reset Input
					(Active LOW)
			2, 5, 6, 9, 12,	Q0 to Q7 Flip Flop Outputs
			15, 16, 19
			3, 4, 7, 8, 13,	D0 to D7	Data Inputs
			14, 17, 18
			11	CLOCK	Clock Input (LOW to
					HIGH, Edge Triggered)
			10	GND	Ground (0V)
			20	Vcc	Positive Supply Voltage
	TRUTH TABLE
		INPUTS		OUTPUTS	FUNCTION
	CLEAR	CLOCK	D	Q
	L	X	X	L	CLEAR
	H		L	L
	H		H	H
	H		X	Qn	NO CHANGE
	X : Don’t Care

LOGIC DIAGRAM

This logic diagram has not be used to estimate propagation delays

2/10

M74HCT273

ABSOLUTE MAXIMUM RATINGS

Symbol	Parameter	Value	Unit
VCC	Supply Voltage	-0.5 to +7	V
VI	DC Input Voltage	-0.5 to VCC + 0.5	V
VO	DC Output Voltage	-0.5 to VCC + 0.5	V
IIK	DC Input Diode Current	± 20	mA
IOK	DC Output Diode Current	± 20	mA
IO	DC Output Current	± 25	mA
ICC or IGND	DC VCC or Ground Current	± 50	mA
PD	Power Dissipation	500(*)	mW
Tstg	Storage Temperature	-65 to +150	°C
TL	Lead Temperature (10 sec)	300	°C

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied

(*) 500mW at 65 °C; derate to 300mW by 10mW/°C from 65°C to 85°C

RECOMMENDED OPERATING CONDITIONS

Symbol	Parameter	Value	Unit
VCC	Supply Voltage	4.5 to 5.5	V
VI	Input Voltage	0 to VCC	V
VO	Output Voltage	0 to VCC	V
Top	Operating Temperature	-55 to 125	°C
tr, tf	Input Rise and Fall Time (VCC = 4.5 to 5.5V)	0 to 500	ns

DC SPECIFICATIONS

Test Condition

Value

Symbol

Parameter

VCC

TA = 25°C

-40 to 85°C

-55 to 125°C

Unit

(V)

Min.

Typ.

Max.

Min.

Max.

Min.

Max.

VIH

High Level Input

4.5

2.0

2.0

2.0

V

Voltage

to

5.5

VIL

Low Level Input

4.5

0.8

0.8

0.8

V

Voltage

to

5.5

VOH

High Level Output

4.5

IO=-20 μA

4.4

4.5

4.4

4.4

V

Voltage

IO=-4.0 mA

4.18

4.31

4.13

4.10

VOL

Low Level Output

4.5

IO=20 μA

0.0

0.1

0.1

0.1

V

Voltage

IO=4.0 mA

0.17

0.26

0.33

0.40

II

Input Leakage

5.5

VI = VCC or GND

± 0.1

± 1

± 1

μA

Current

ICC

Quiescent Supply

5.5

VI = VCC or GND

4

40

80

μA

Current

ICC

Additional Worst

5.5

Per Input pin

2.0

2.9

3.0

mA

Case Supply

VI = 0.5V or

Current

VI = 2.4V

Other Inputs at

VCC or GND

IO = 0

3/10