Fairchild Semiconductor 74ABT244CSJX, 74ABT244CSJ, 74ABT244CSCX, 74ABT244CSC, 74ABT244CPC Datasheet

May 1992

Revised November 1999

74ABT244

Octal Buffer/Line Driver with 3-STATE Outputs

General Description

The ABT244 is an octal buffer and line driver with 3-STATE outputs designed to be employed as a memory and address driver, clock driver, or bus-oriented transmitter/ receiver.

Features

■Non-inverting buffers

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

■Guaranteed output skew

■Guaranteed multiple output switching specifications

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

■Guaranteed simultaneous 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
74ABT244CSC	M20B	20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide Body
74ABT244CSJ	M20D	20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74ABT244CMSA	MSA20	20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
74ABT244CMTC	MTC20	20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74ABT244CPC	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.

Connection Diagram

Pin Descriptions

Pin Names

Description

1,

2

Output Enable Input

OE

OE

(Active LOW)

I0–I7

Inputs

O0–O7

Outputs

Truth Table

OE1

I0–3

O0–3

OE2

I4–7

O4–7

H

X

Z

H

X

Z

L

H

H

L

H

H

L

L

L

L

L

L

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

Z = High Impedance

Outputs STATE-3 with Driver Buffer/Line Octal 74ABT244

© 1999 Fairchild Semiconductor Corporation

DS010992

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74ABT244

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

0.55

IOL =

64 mA

IIH

Input HIGH Current

1

µ A

Max

VIN =

2.7V (Note 4)

1

VIN =

VCC

IBVI

Input HIGH Current Breakdown Test

7

µ A

Max

VIN =

7.0V

IIL

Input LOW Current

− 1

µ A

Max

VIN =

0.5V (Note 4)

− 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 =

OE

2.0V

IOZL

Output Leakage Current

− 10

µ A

0 −

5.5V

VOUT =

0.5V;

n =

OE

2.0V

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 Ground

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 Ground

ICCD

Dynamic ICC

No Load

mA/

Max

Outputs OPEN

(Note 4)

0.1

MHz

n =

OE

GND, (Note 3)

One Bit Toggling, 50% Duty Cycle

Note 3: For 8 bits toggling, ICCD <

0.8 mA/MHz.

Note 4: Guaranteed, but not tested.

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DC Electrical Characteristics

74ABT244

(SOIC package)

Conditions

Symbol

Parameter

Min

Typ

Max

Units

VCC

CL =

50 pF,

RL =

500Ω

VOLP

Quiet Output Maximum Dynamic VOL

0.5

0.8

V

5.0

TA =

25° C (Note 5)

VOLV

Quiet Output Minimum Dynamic VOL

−

1.3

− 0.8

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 7)

VIHD

Minimum HIGH Level Dynamic Input Voltage

2.0

1.5

V

5.0

TA =

25° C (Note 6)

VILD

Maximum LOW Level Dynamic Input Voltage

1.1

0.8

V

5.0

TA =

25° C (Note 6)

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

(SOIC and SSOP package)

TA = + 25° C

TA = −

55° C to +

125° C

TA = − 40° C to + 85° C

Symbol

Parameter

VCC = + 5V

VCC =

4.5V–5.5V

VCC =

4.5V–5.5V

Units

CL = 50 pF

CL = 50 pF

CL = 50 pF

Min

Typ

Max

Min

Max

Min

Max

tPLH

Propagation Delay

1.0

2.5

3.6

1.0

5.3

1.0

3.6

ns

tPHL

Data to Outputs

1.0

2.3

3.6

1.0

5.0

1.0

3.6

tPZH

Output Enable

1.5

3.5

6.0

0.8

6.5

1.5

6.0

ns

tPZL

Time

1.5

3.6

6.0

1.2

7.9

1.5

6.0

tPHZ

Output Disable

1.7

3.5

5.6

1.2

7.6

1.7

5.6

ns

tPLZ

Time

1.7

3.3

5.6

1.0

7.9

1.7

5.6

Extended AC Electrical Characteristics

(SOIC package)

TA− 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

Max 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

5.0

1.5

6.0

2.5

8.5

tPZH

Output Enable Time

1.5

6.5

2.5

7.5

2.5

10.0

ns

tPZL

1.5

6.5

2.5

7.5

2.5

12.0

tPHZ

Output Disable Time

1.0

5.6

(Note 11)

(Note 11)

ns

tPLZ

1.0

5.6

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.

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