Fairchild Semiconductor 74ABT2541CSCX, 74ABT2541CSC, 74ABT2541CPC, 74ABT2541CMTCX, 74ABT2541CMTC Datasheet

September 1992

Revised November 1999

74ABT2541

Octal Buffer/Line Driver with

25Ω Series Resistors in the Outputs

General Description

The ABT2541 is an octal buffer and line driver designed to drive the capacitive inputs of MOS memory drivers, address drivers, clock drivers, and bus-oriented transmitters/receivers. Functionally identical to the ABT541.

The 25Ω series resistors in the outputs reduce ringing and eliminate the need for external resistors.

Features

■Guaranteed output skew

■Guaranteed multiple output switching specifications

■Output switching specified for both 50 pF and 250 pF loads

■Guaranteed simultaneously switching noise level and dynamic threshold performance

■Guaranteed latchup protection

■High impedance glitch free bus loading during entire power up and power down cycle

■Nondestructive hot insertion capability

■Disable time less than enable time to avoid bus contention

Ordering Code:

Order Number

Package Number

Package Description

74ABT2541CSC

M20B

20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide Body

74ABT2541CSJ

M20D

20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

74ABT2541CMSA

MSA20

20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide

74ABT2541CMTC

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 “X” to the ordering code.

Connection Diagram

Pin Descriptions

Pin Names

Description

1,

2

Output Enable Input (Active LOW)

OE

OE

I0–I7

Inputs

O0–O7

Outputs

Truth Table

Schematic of Each Output

Inputs

Outputs

OE1

OE2

I

L

L

H

H

H

X

X

Z

X

H

X

Z

L

L

L

L

H =	HIGH Voltage Level
L =	LOW Voltage Level
X =	Immaterial
Z =	High Impedance

Outputs the in Resistors Series Ω25 with Driver Buffer/Line Octal 74ABT2541

© 1999 Fairchild Semiconductor Corporation

DS011502

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74ABT2541

Absolute Maximum Ratings(Note 1)

Storage Temperature	− 65° C to + 150° C
Ambient Temperature under Bias	− 55° C to + 125° C
Junction Temperature under Bias	− 55° C to + 150° C
VCC Pin Potential to Ground Pin	− 0.5V to + 7.0V
Input Voltage (Note 2)	− 0.5V to + 7.0V
Input Current (Note 2)	− 30 mA to + 5.0 mA
Voltage Applied to Any Output
in the Disabled or
Power-Off State	− 0.5V to 5.5V
in the HIGH State	− 0.5V to VCC
Current Applied to Output
in LOW State (Max)	twice the rated IOL (mA)
DC Latchup Source Current	− 500 mA
Over Voltage Latchup (I/O)	10V

Recommended Operating

Conditions

Free Air Ambient Temperature	− 40° C to + 85° C
Supply Voltage	+ 4.5V to + 5.5V
Minimum Input Edge Rate (∆ V/∆ t)
Data Input	50 mV/ns
Enable Input	20 mV/ns

Note 1: Absolute maximum ratings are values beyond which the device may be damaged or have its useful life impaired. Functional operation under these conditions is not implied.

Note 2: Either voltage limit or current limit is sufficient to protect inputs.

DC Electrical Characteristics

Symbol

Parameter

Min

Typ

Max

Units

VCC

Conditions

VIH

Input HIGH Voltage

2.0

V

Recognized HIGH Signal

VIL

Input LOW Voltage

0.8

V

Recognized LOW Signal

VCD

Input Clamp Diode Voltage

− 1.2

V

Min

IIN =

− 18 mA

VOH

Output HIGH Voltage

2.5

V

Min

IOH =

−

3 mA

2.0

V

Min

IOH =

−

32 mA

VOL

Output LOW Voltage

0.8

V

Min

IOL =

15 mA

IIH

Input HIGH Current

1

µ A

Max

VIN =

2.7V (Note 3)

1

VIN =

VCC

IBVI

Input HIGH Current

7

µ A

Max

VIN =

7.0V

Breakdown Test

IIL

Input LOW Current

− 1

µ A

Max

VIN =

0.5V (Note 3)

− 1

VIN =

0.0V

VID

Input Leakage Test

4.75

V

0.0

IID =

1.9 µ A

All Other Pins Grounded

IOZH

Output Leakage Current

10

µ A

0 −

5.5V

VOUT =

2.7V;

n =

2.0V

OE

IOZL

Output Leakage Current

− 10

µ A

0 −

5.5V

VOUT =

0.5V;

n =

2.0V

OE

IOS

Output Short-Circuit Current

− 100

− 275

mA

Max

VOUT =

0.0V

ICEX

Output High Leakage Current

50

µ A

Max

VOUT =

VCC

IZZ

Bus Drainage Test

100

µ A

0.0

VOUT =

5.5V; All Others GND

ICCH

Power Supply Current

50

µ A

Max

All Outputs HIGH

ICCL

Power Supply Current

30

mA

Max

All Outputs LOW

ICCZ

Power Supply Current

50

µ A

Max

n =

OE

VCC;

All Others at VCC or GND

ICCT

Additional ICC/Input

Outputs Enabled

2.5

mA

VI =

VCC − 2.1V

Outputs 3-STATE

2.5

mA

Max

Enable Input VI = VCC − 2.1V

Outputs 3-STATE

50

µ A

Data Input VI = VCC − 2.1V

All Others at VCC or GND

ICCD

Dynamic ICC

No Load

mA/

Max

Outputs OPEN

(Note 4)

0.1

MHz

OEn =

GND (Note 3)

One Bit Toggling, 50% Duty Cycle

Note 3: Guaranteed, but not tested.

Note 4: For 8 bit toggling, ICCD <

0.8 mA/MHz.

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DC Electrical Characteristics

(SOIC Package)

Symbol	Parameter	Min	Typ	Max	Units	VCC		Conditions
							CL = 50 pF, RL = 500Ω
VOLP	Quiet Output Maximum Dynamic VOL		0.6	0.8	V	5.0	TA =	25° C (Note 5)
VOLV	Quiet Output Minimum Dynamic VOL	− 0.5	− 0.4		V	5.0	TA =	25° C (Note 5)
VOHV	Minimum HIGH Level Dynamic Output Voltage	2.7	3.1		V	5.0	TA =	25° C (Note 6)
VIHD	Minimum HIGH Level Dynamic Input Voltage	2.0	1.4		V	5.0	TA =	25° C (Note 7)
VILD	Maximum LOW Level Dynamic Input Voltage		1.2	0.8	V	5.0	TA =	25° C (Note 7)

Note 5: Max number of outputs defined as (n). n-1 data inputs are driven 0V to 3V. One output at LOW. Guaranteed, but not tested.

Note 6: Max number of data inputs (n) switching. n-1 inputs switching 0V to 3V. Input-under-test switching: 3V to threshold (VILD), 0V to threshold (VIHD). Guaranteed, but not tested.

Note 7: Max number of outputs defined as (n). n − 1 data inputs are driven 0V to 3V. One output HIGH. Guaranteed, but not tested.

AC Electrical Characteristics

			TA = + 25° C			TA = − 40° C to + 85° C
	Symbol	Parameter	VCC = +		5V	VCC =	4.5V–5.5V		Units
			CL	= 50 pF		CL =		50 pF
			Min	Typ	Max	Min		Max
	tPLH	Propagation Delay Data to Outputs	1.0	2.3	3.6	1.0		3.6	ns
	tPHL		1.0	3.3	4.1	1.0		4.1
	tPZH	Output Enable Time	1.5	3.7	6.0	1.5		6.0	ns
	tPZL		1.5	4.3	6.5	1.5		6.5
	tPHZ	Output Disable Time	1.0	3.5	6.0	1.0		6.0	ns
	tPLZ		1.0	3.7	5.6	1.0		5.6

Extended AC Electrical Characteristics

	(SOIC Package)
			− 40° C to + 85° C			TA = − 40° C to + 85° C		TA = − 40° C to + 85° C
			VCC =	4.5V–5.5V		VCC =	4.5V–5.5V	VCC =	4.5V–5.5V
	Symbol	Parameter	CL = 50 pF			CL =	250 pF	CL =	250 pF	Units
			8 Outputs Switching			1 Output Switching		8 Outputs Switching
			(Note 8)			(Note 9)		(Note 10)
			Min	Typ	Max	Min	Max	Min	Max
	fTOGGLE	Maximum Toggle Frequency		100						MHz
	tPLH	Propagation Delay	1.5		5.0	1.5	6.0	2.5	8.5	ns
	tPHL	Data to Outputs	1.5		5.5	1.5	10.0	2.5	11.0
	tPZH	Output Enable Time	1.5		6.5	2.5	7.5	2.5	9.5	ns
	tPZL		1.5		7.0	2.5	11.0	2.5	12.5
	tPHZ	Output Disable Time	1.0		6.0	(Note 11)		(Note 11)		ns
	tPLZ		1.0		6.0

Note 8: This specification is guaranteed but not tested. The limits apply to propagation delays for all paths described switching in phase (i.e., all LOW-to-HIGH, HIGH-to-LOW, etc.).

Note 9: This specification is guaranteed but not tested. The limits represent propagation delay with 250 pF load capacitors in place of the 50 pF load capacitors in the standard AC load. This specification pertains to single output switching only.

Note 10: This specification is guaranteed but not tested. The limits represent propagation delays for all paths described switching in phase (i.e., all LOW-to-HIGH, HIGH-to-LOW, etc.) with 250 pF load capacitors in place of the 50 pF load capacitors in the standard AC load.

Note 11: The 3-STATE delays are dominated by the RC network (500Ω , 250 pF) on the output and have been excluded from the datasheet.

74ABT2541

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