Fairchild Semiconductor 74AC540SJ, 74AC540SCX, 74AC540SC, 74AC540PC, 74AC540MTCX Datasheet

November 1988

Revised November 1999

74AC540

Octal Buffer/Line Driver with 3-STATE Outputs

General Description

The AC540 is an octal buffer/line drivers designed to be employed as memory and address drivers, clock drivers and bus oriented transmitter/receivers.

These devices are similar in function to the AC240 while providing flow-through architecture (inputs on opposite side from outputs). This pinout arrangement makes these devices especially useful as output ports for microprocessors, allowing ease of layout and greater PC board density.

Features

■ICC and IOZ reduced by 50%

■3-STATE inverting outputs

■Inputs and outputs opposite side of package, allowing easier interface to microprocessors

■Output source/sink 24 mA

Ordering Code:

Order Number	Package Number	Package Description
74AC540SC	M20B	20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide Body
74AC540SJ	M20D	20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74AC540MTC	MTC20	20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74AC540PC	N20A	20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide

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

Logic Symbol	Connection Diagram
	IEEE/IEC

Truth Table

				Inputs				Outputs
	OE1			OE2			I
		L			L		H	L
		H			X		X	Z
		X			H		X	Z
		L			L		L	H
	H = HIGH Voltage Level						X = Immaterial
	L = LOW Voltage Level						Z = High Impedance

FACT is a trademark of Fairchild Semiconductor Corporation.

Outputs STATE-3 with Driver Buffer/Line Octal 74AC540

© 1999 Fairchild Semiconductor Corporation

Ds009966

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74AC540

Absolute Maximum Ratings(Note 1)

Supply Voltage (VCC)		− 0.5V to + 7.0V
DC Input Diode Current (IIK)
VI =	− 0.5V	− 20 mA
VI =	VCC + 0.5V	+ 20 mA
DC Input Voltage (VI)		− 0.5V to VCC + 0.5V
DC Output Diode Current (IOK)
VO =	− 0.5V	− 20 mA
VO =	VCC + 0.5V	+ 20 mA
DC Output Voltage (VO)		− 0.5V to VCC + 0.5V
DC Output Source
or Sink Current (IO)		± 50 mA
DC VCC or Ground Current
per Output Pin (ICC or IGND)		± 50 mA
Storage Temperature (TSTG)		− 65° C to + 150° C
Junction Temperature (TJ)
PDIP		140° C

Recommended Operating

Conditions

Supply Voltage (VCC)	2.0V to 6.0V
Input Voltage (VI)	0V to VCC
Output Voltage (VO)	0V to VCC
Operating Temperature (TA)	− 40° C to + 85° C
Minimum Input Edge Rate (∆ V/∆ t)	125 mV/ns
VIN from 30% to 70% of VCC
VCC @ 3.3V, 4.5V, 5.5V

Note 1: Absolute maximum ratings are those values beyond which damage to the device may occur. The databook specifications should be met, without exception, to ensure that the system design is reliable over its power supply, temperature, and output/input loading variables. Fairchild does not recommend operation of FACT circuits outside databook specifications.

DC Electrical Characteristics

Symbol	Parameter	VCC	TA = + 25° C			TA = − 40° C to + 85° C	Units		Conditions
		(V)	Typ		Guaranteed Limits
VIH	Minimum HIGH Level	3.0	1.5	2.1		2.1		VOUT =		0.1V
	Input Voltage	4.5	2.25	3.15		3.15	V	or VCC −			0.1V
		5.5	2.75	3.85		3.85
VIL	Maximum LOW Level	3.0	1.5	0.9		0.9		VOUT =		0.1V
	Input Voltage	4.5	2.25	1.35		1.35	V	or VCC −			0.1V
		5.5	2.75	1.65		1.65
VOH	Minimum HIGH Level	3.0	2.99	2.9		2.9
	Output Voltage	4.5	4.49	4.4		4.4	V	IOUT =		−	50 µ A
		5.5	5.49	5.4		5.4
								VIN =	VIL or VIH
		3.0		2.56		2.46		IOH =	−	12 mA
		4.5		3.86		3.76	V	IOH =	−	24 mA
		5.5		4.86		4.76		IOH =	− 24 mA (Note 2)
VOL	Maximum LOW Level	3.0	0.002	0.1		0.1
	Output Voltage	4.5	0.001	0.1		0.1	V	IOUT =		50 µ A
		5.5	0.001	0.1		0.1
								VIN =	VIL or VIH
		3.0		0.36		0.44		IOL =	12 mA
		4.5		0.36		0.44	V	IOL =	24 mA
		5.5		0.36		0.44		IOL =	24 mA (Note 2)
IIN	Maximum Input	5.5		± 0.1		± 1.0	µ A	VI =	VCC, GND
(Note 4)	Leakage Current
IOZ	Maximum 3-STATE							VI (OE) = VIL, VIH
	Current	5.5		± 0.25		± 2.5	µ A	VI =	VCC, GND
								VO =	VCC, GND
IOLD	Minimum Dynamic	5.5				75	mA	VOLD =		1.65V Max
IOHD	Output Current (Note 3)	5.5				− 75	mA	VOHD =			3.85V Min
ICC	Maximum Quiescent	5.5		4.0		40.0	µ A	VIN =	VCC
(Note 4)	Supply Current							or GND

Note 2: All outputs loaded; thresholds on input associated with output under test.

Note 3: Maximum test duration 2.0 ms, one output loaded at a time.

Note 4: IIN and ICC @ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V VCC.

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AC Electrical Characteristics

			VCC			TA = + 25° C		TA = − 40° C to + 85° C
Symbol	Parameter		(V)			CL = 50 pF		CL =	50 pF	Units
			(Note 5)		Min	Typ	Max	Min	Max
tPLH	Propagation Delay		3.3		1.5	5.5	7.5	1.0	8.0	ns
	Data to Output		5.0		1.5	4.0	6.0	1.0	6.5
tPHL	Propagation Delay		3.3		1.5	5.0	7.0	1.0	7.5	ns
	Data to Output		5.0		1.5	4.0	5.5	1.0	6.0
tPZH	Output Enable Time		3.3		3.0	8.5	11.0	2.5	12.0	ns
			5.0		2.0	6.5	8.5	2.0	9.5
tPZL	Output Enable Time		3.3		2.5	7.5	10.0	2.0	11.0	ns
			5.0		2.0	6.0	7.5	1.5	8.5
tPHZ	Output Disable Time		3.3		2.5	8.5	13.0	1.5	14.0	ns
			5.0		1.5	7.5	10.5	1.0	11.0
tPLZ	Output Disable Time		3.3		2.5	7.0	10.0	2.0	11.0	ns
			5.0		1.5	6.0	8.0	1.5	9.0
Note 5: Voltage	Range 3.3 is 3.3V ±	0.3V
Voltage Range 5.0 is 5.0V ±		0.5V

Capacitance

Symbol	Parameter	Typ	Units		Conditions
CIN	Input Capacitance	4.5	pF	VCC =	OPEN
CPD	Power Dissipation Capacitance	30.0	pF	VCC =	5.0V

74AC540

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