MOTOROLA MC74VHC244ML2, MC74VHC244DW, MC74VHC244DWR2, MC74VHC244M, MC74VHC244MEL Datasheet

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

Octal Bus Buffer

The MC74VHC244 is an advanced high speed CMOS octal bus buffer fabricated with silicon gate CMOS technology. It achieves high speed operation similar to equivalent Bipolar Schottky TTL while maintaining CMOS low power dissipation.

The MC74VHC244 is a noninverting 3±state buffer, and has two active±low output enables. This device is designed to be used with 3±state memory address drivers, etc.

The internal circuit is composed of three stages, including a buffer output which provides high noise immunity and stable output. The inputs tolerate voltages up to 7V, allowing the interface of 5V systems to 3V systems.

•High Speed: tPD = 3.9ns (Typ) at VCC = 5V

•Low Power Dissipation: ICC = 4μA (Max) at TA = 25°C

•High Noise Immunity: VNIH = VNIL = 28% VCC

•Power Down Protection Provided on Inputs

•Balanced Propagation Delays

•Designed for 2V to 5.5V Operating Range

•Low Noise: VOLP = 0.9V (Max)

•Pin and Function Compatible with Other Standard Logic Families

•Latchup Performance Exceeds 300mA

•ESD Performance: HBM > 2000V; Machine Model > 200V

•Chip Complexity: 136 FETs or 34 Equivalent Gates

LOGIC DIAGRAM

	A1	2	18	YA1
	A2	4	16	YA2
	A3	6	14	YA3
	A4	8	12	YA4
DATA				NONINVERTING
INPUTS	B1	11	9	OUTPUTS
				YB1
	B2	13	7	YB2
	B3	15	5	YB3
	B4	17	3	YB4
OUTPUT	OEA	1
ENABLES	OEB	19

MC74VHC244

DW SUFFIX

20±LEAD SOIC PACKAGE

CASE 751D±04

DT SUFFIX

20±LEAD TSSOP PACKAGE

CASE 948E±02

M SUFFIX

20±LEAD SOIC EIAJ PACKAGE

CASE 967±01

ORDERING INFORMATION

MC74VHCXXXDW SOIC MC74VHCXXXDT TSSOP MC74VHCXXXM SOIC EIAJ

PIN ASSIGNMENT

OEA			1	20		VCC
A1			2	19		OEB
YB4			3	18		YA1
A2			4	17		B4
YB3			5	16		YA2
A3			6	15		B3
YB2			7	14		YA3
A4			8	13		B2
YB1			9	12		YA4
GND			10	11		B1

FUNCTION TABLE

				INPUTS					OUTPUTS
		OEA, OEB					A, B		YA, YB
		L					L		L
		L					H		H
		H					X		Z
6/97
Motorola, Inc. 1997							1			REV 1

MC74VHC244

MAXIMUM RATINGS*

Symbol	Parameter		Value	Unit
VCC	DC Supply Voltage		± 0.5 to + 7.0	V
Vin	DC Input Voltage		± 0.5 to + 7.0	V
Vout	DC Output Voltage		± 0.5 to VCC + 0.5	V
IIK	Input Diode Current		± 20	mA
IOK	Output Diode Current		± 20	mA
Iout	DC Output Current, per Pin		± 25	mA
ICC	DC Supply Current, VCC and GND Pins		± 50	mA
PD	Power Dissipation in Still Air,	SOIC Packages²	500	mW
		TSSOP Package²	450
Tstg	Storage Temperature		± 65 to + 150	_C

*Absolute maximum continuous ratings are those values beyond which damage to the device may occur. Exposure to these conditions or conditions beyond those indicated may adversely affect device reliability. Functional operation under absolute±maximum±rated conditions is not implied.

²Derating Ð SOIC Packages: ± 7 mW/ _C from 65_ to 125_C TSSOP Package: ± 6.1 mW/_C from 65_ to 125_C

RECOMMENDED OPERATING CONDITIONS

Symbol	Parameter		Min	Max	Unit
VCC	DC Supply Voltage		2.0	5.5	V
Vin	DC Input Voltage		0	5.5	V
Vout	DC Output Voltage		0	VCC	V
TA	Operating Temperature, All Package Types		± 40	+ 85	_C
tr, tf	Input Rise and Fall Time	VCC = 3.3V ±0.3V	0	100	ns/V
		VCC =5.0V ±0.5V	0	20

DC ELECTRICAL CHARACTERISTICS

This device contains protection circuitry to guard against damage due to high static voltages or electric fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this high±impedance circuit. For proper operation, Vin and Vout should be constrained to the

range GND v (Vin or Vout) v VCC. Unused inputs must always be

tied to an appropriate logic voltage level (e.g., either GND or VCC). Unused outputs must be left open.

				VCC		TA = 25°C		TA = ± 40 to 85°C
	Symbol	Parameter	Test Conditions	V	Min	Typ	Max	Min	Max		Unit
	VIH	Minimum High±Level		2.0	1.50			1.50			V
		Input Voltage		3.0 to	VCC x 0.7			VCC x 0.7
				5.5
	VIL	Maximum Low±Level		2.0			0.50		0.50		V
		Input Voltage		3.0 to			VCC x 0.3		VCC x 0.3
				5.5
	VOH	Minimum High±Level	Vin = VIH or VIL	2.0	1.9	2.0		1.9			V
		Output Voltage	IOH = ± 50μA	3.0	2.9	3.0		2.9
				4.5	4.4	4.5		4.4
			Vin = VIH or VIL
			IOH = ± 4mA	3.0	2.58			2.48
			IOH = ± 8mA	4.5	3.94			3.80
	VOL	Maximum Low±Level	Vin = VIH or VIL	2.0		0.0	0.1		0.1		V
		Output Voltage	IOL = 50μA	3.0		0.0	0.1		0.1
				4.5		0.0	0.1		0.1
			Vin = VIH or VIL
			IOL = 4mA	3.0			0.36		0.44
			IOL = 8mA	4.5			0.36		0.44
	Iin	Maximum Input	Vin = 5.5V or GND	0 to 5.5			± 0.1		± 1.0		μA
		Leakage Current
	MOTOROLA			2			VHC Data ± Advanced CMOS Logic
									DL203 Ð Rev 1