Fairchild Semiconductor 74LCX240WMX, 74LCX240WM, 74LCX240SJX, 74LCX240SJ, 74LCX240MTCX Datasheet

February 1994

Revised April 1999

74LCX240

Low Voltage Octal Buffer/Line Driver with 5V Tolerant Inputs and Outputs

General Description

The LCX240 is an inverting octal buffer and line driver designed to be employed as a memory address driver, clock driver and bus oriented transmitter or receiver. The device is designed for low voltage (2.5V or 3.3V) VCC applications with capability of interfacing to a 5V signal environment.

The LCX240 is fabricated with an advanced CMOS technology to achieve high speed operation while maintaining CMOS low power dissipation.

Features

■5V tolerant inputs and outputs

■2.3V–3.6V VCC specifications provided

■6.5 ns tPD max (VCC = 3.3V), 10 μA ICC max

■Power-down high impedance inputs and outputs

■Supports live insertion/withdrawal (Note 1)

■±24 mA output drive (VCC = 3.0V)

■Implements patented noise/EMI reduction circuitry

■Latch-up performance exceeds 500 mA

■ESD performance:

Human body model > 2000V

Machine model > 200V

Note 1: To ensure the high-impedance state during power up or down, OE should be tied to VCC through a pull-up resistor: the minimum value or the resistor is determined by the current-sourcing capability of the driver.

Ordering Code:

Order Number	Package Number	Package Description
74LCX240WM	M20B	20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
74LCX240SJ	M20D	20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74LCX240MSA	MSA20	20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
74LCX240MTC	MTC20	20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Logic Diagram

Connection Diagram

Outputs and Inputs Tolerant 5V with Driver Buffer/Line Octal Voltage Low 74LCX240

© 1999 Fairchild Semiconductor Corporation

DS011993.prf

www.fairchildsemi.com

74LCX240

Pin Descriptions

			Pin Names						Description
				1,				2	3-STATE Output Enable Inputs
		OE				OE
	I0–I7								Inputs
							7		Outputs
	O		0–O

Truth Tables

		Inputs			Outputs
					(Pins 12, 14, 16, 18)
OE1				In
	L			L	H
	L			H	L
	H			X	Z
		Inputs			Outputs
				In	(Pins 3, 5, 7, 9)
	OE2
	L			L	H
	L			H	L
	H			X	Z

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

Z = High Impedance

www.fairchildsemi.com

2

Absolute Maximum Ratings(Note 2)

Symbol	Parameter	Value	Conditions	Units
VCC	Supply Voltage	−0.5 to +7.0		V
VI	DC Input Voltage	−0.5 to +7.0		V
VO	DC Output Voltage	−0.5 to +7.0	Output in 3-STATE	V
		−0.5 to VCC + 0.5	Output in HIGH or LOW State (Note 3)	V
IIK	DC Input Diode Current	−50	VI < GND	mA
IOK	DC Output Diode Current	−50	VO < GND	mA
		+50	VO > VCC
IO	DC Output Source/Sink Current	±50		mA
ICC	DC Supply Current per Supply Pin	±100		mA
IGND	DC Ground Current per Ground Pin	±100		mA
TSTG	Storage Temperature	−65 to +150		°C

Recommended Operating Conditions (Note 4)

Symbol	Parameter		Min	Max	Units
VCC	Supply Voltage	Operating	2.0	3.6	V
		Data Retention	1.5	3.6
VI	Input Voltage		0	5.5	V
VO	Output Voltage	HIGH or LOW State	0	VCC	V
		3-STATE	0	5.5
IOH/IOL	Output Current	VCC = 3.0V − 3.6V		±24
		VCC = 2.7V − 3.0V		±12	mA
		VCC = 2.3V − 2.7V		±8
TA	Free-Air Operating Temperature		−40	85	°C
t/ V	Input Edge Rate, VIN = 0.8V–2.0V, VCC = 3.0V		0	10	ns/V

Note 2: The Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the Absolute Maximum Ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation.

Note 3: IO Absolute Maximum Rating must be observed.

Note 4: Unused inputs must be held HIGH or LOW. They may not float.

DC Electrical Characteristics

Symbol	Parameter	Conditions	VCC	TA = −40°C to +85°C		Units
			(V)	Min	Max
VIH	HIGH Level Input Voltage		2.3 − 2.7	1.7		V
			2.7 − 3.6	2.0
VIL	LOW Level Input Voltage		2.3 − 2.7		0.7	V
			2.7 − 3.6		0.8
VOH	HIGH Level Output Voltage	IOH = −100μA	2.3 − 3.6	VCC - 0.2
		IOH = -8 mA	2.3	1.8
		IOH = −12 mA	2.7	2.2		V
		IOH = −18 mA	3.0	2.4
		IOH = −24 mA	3.0	2.2
VOL	LOW Level Output Voltage	IOL = 100μA	2.3 − 3.6		0.2
		IOL = 8mA	2.3		0.6
		IOL = 12 mA	2.7		0.4	V
		IOL = 16 mA	3.0		0.4
		IOL = 24 mA	3.0		0.55
II	Input Leakage Current	0 ≤ VI ≤ 5.5V	2.3 − 3.6		±5.0	μA
IOFF	Power-Off Leakage Current	VI or VO = 5.5V			10	μA
ICC	Quiescent Supply Current	VI = VCC or GND	2.3 − 3.6		10	μA
		3.6V ≤ VI, VO ≤ 5.5V (Note 5)	2.3 − 3.6		±10
ICC	Increase in ICC per Input	VIH = VCC = 0.6V	2.3 − 3.6		500	μA

Note 5: Outputs disabled or 3-STATE only.

74LCX240

3	www.fairchildsemi.com