Fairchild Semiconductor 74ABT240CSJX, 74ABT240CSJ, 74ABT240CSCX, 74ABT240CSC, 74ABT240CMTCX Datasheet

© 1999 Fairchild Semiconductor Corporation DS011664 www.fairchildsemi.com

March 1994
Revised November 1999

74ABT240 Octal Buffer/Line Driver with 3-STATE Outputs

74ABT240
Octal Buffer/Line Driv e r wit h 3- S TATE Outputs

General Description

The ABT240 is an inverting octal buffer and line driver
designed to be employed as a memory address driver,
clock driver and bus or iented tra nsmitter or receive r which
provides improved PC board density.

Features

■ Output sink capability of 64 mA, source capability of
32 mA

■ Guarante ed latchup protection

■ High impedance glitch free bus loading during entire

power up and power down cycle

■ Nondestructive hot insertion capability

Ordering Code:

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

Connection Diagram Pin Descriptions

Tru th Tables

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

Order Number Package Number Package Description

74ABT240CSC M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide Body
74ABT240CSJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74ABT240CMSA MSA20 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
74ABT240CMTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

Pin Names Description

OE

1

, OE

2

3-STATE Output
Enable Inputs

I

0–I7

Inputs

O

0–O7

Outputs

Inputs Outputs

(Pins 12, 14, 16, 18)

OE

1

I

n

LL H
LH L
HX Z

Inputs Outputs

(Pins 3, 5, 7, 9)

OE

2

I

n

LL H
LH L
HX Z

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74ABT240

Absolute Maximum Ratings(Note 1) Recommended Operating

Conditions

Note 1: Absolute maximum ratings are values beyond which the device

may be damaged or have its useful life impaired. Functional operation
under these conditi ons is not implied.

Note 2: Either voltage lim it or c urrent limit is sufficient to prot ect inputs.

DC Electrical Characteristics

Note 3: Guaranteed, but not tested.
Note 4: For 8 bits toggling, I

CCD

< 0.8 mA/MHz.

Storage Temperature −65°C to +150°C
Junction Temperature under Bias −55°C to +150°C
V

CC

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 V

CC

Current Applied to Output

in LOW State (Max) twice the rated I

OL

(mA)

DC Latchup Source Current

(Across Comm Operating Range) −150 mA

Over Voltage Latchup (I/O) 10V

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

Symbol Parameter Min Typ Max Units

V

CC

Conditions

V

IH

Input HIGH Voltage 2.0 V Recognized HIGH Signal

V

IL

Input LOW Voltage 0.8 V Recognized LOW Signal

V

CD

Input Clamp Diode Voltage −1.2 V Min IIN = −18 mA

V

OH

Output HIGH Voltage 2.5 V Min IOH = −3 mA

2.0 V Min IOH = −32 mA

V

OL

Output LOW Voltage 0.55 V Min IOL = 64 mA

I

IH

Input HIGH Current 1

µAMax

VIN = 2.7V (Note 3)

1V

IN

= V

CC

I

BVI

Input HIGH Current Breakdown Test 7 µAMaxVIN = 7.0V

I

IL

Input LOW Current −1

µAMax

VIN = 0.5V (Note 3)

−1V

IN

= 0.0V

V

ID

Input Leakage Test 4.75 V 0.0 IID = 1.9 µA

All Other Pins Grounded

I

OZH

Output Leakage Current 10 µA0 − 5.5V

V

OUT

= 2.7V; OEn = 2.0V

I

OZL

Output Leakage Current −10 µA0 − 5.5V

V

OUT

= 0.5V; OEn = 2.0V

I

OS

Output Short-Circuit Current −100 −275 mA Max V

OUT

= 0.0V

I

CEX

Output HIGH Leakage Current 50 µAMaxV

OUT

= V

CC

I

ZZ

Bus Drainage Test 100 µA0.0V

OUT

= 5.5V; All Others GND

I

CCH

Power Supply Current 50 µA Max All Outputs HIGH

I

CCL

Power Supply Current 30 mA Max All Outputs LOW

I

CCZ

Power Supply Current

50 µAMax

OEn = VCC;
All Others at VCC or Ground

I

CCT

Additional ICC/Input Outputs Enabled 1.5 mA

Max

VI = VCC − 2.1V
Outputs 3-STATE 1.5 mA Enable Input VI = VCC − 2.1V
Outputs 3-STATE 50 µA Data Input VI = VCC − 2.1V

All Others at VCC or Ground

I

CCD

Dynamic I

CC

No Load mA/

Max

Outputs Open

(Note 3) 0.1

MHz

OEn = GND, (Note 4)

One Bit Toggling, 50% Duty Cycle

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74ABT240

AC Electrical Characteristics

Capacitance

Note 5: C

OUT

is measured at frequency f = 1 MHz, per MIL-STD-883, Method 3012.

TA = +25°CT

A

= −55°C to +125°CTA = −40°C to +85°C

V

CC

= +5V VCC = 4.5V–5.5V VCC = 4.5V–5.5V

Symbol Parameter

C

L

= 50 pF CL = 50 pF CL = 50 pF

Units

Min Typ Max Min Max Min Max

t

PLH

Propagation Delay 1.0 4.8 0.8 5.5 1.0 4.8

ns

t

PHL

Data to Outputs 1.6 4.8 1.0 5.5 1.6 4.8

t

PZH

Output Enable 1.1 6.2 0.8 7.5 1.1 6.2

ns

t

PZL

Time 1.1 6.2 0.8 7.7 1.1 6.2

t

PHZ

Output Disable 1.8 6.4 1.0 7.5 1.8 6.4

ns

t

PLZ

Time 1.6 5.8 1.0 7.2 1.6 5.8

Symbol Parameter Typ Units

Conditions

T

A

= 25°C

C

IN

Input Capacitance 5.0 pF VCC = 0V

C

OUT

(Note 5) Output Capacitance 9.0 pF VCC = 5.0V