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

May 1992
Revised November 1999

74ABT244
Octal Buffer/Line Driv e r with 3-STATE Outputs

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 sp ecified for both 50 pF and 250 pF

loads

■ Guaranteed simultaneous switching, noise level and
dynamic threshold performan ce

■ 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 ena ble time to avoi d bus conten-

tion

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 or dering code.

Connection Diagram Pin Descriptions

Pin Names Description

OE

I

0–I7

O

1

0–O7

, OE

Output Enable Input

2

(Active LOW)
Inputs
Outputs

Truth Table

OE

1I0–3O0–3

HXZHXZ
LHHLHH
LLLLLL

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

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OE2I

4–7O4–7

Absolute Maximum Ratings(Note 1) Recommended Operating

Storage Temperatur e −65°C to +150°C
Ambient Temperature under Bias −55°C to +125°C

74ABT244

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

Pin Potential to Ground Pin −0.5V to +7.0V

CC

Input Voltage (Note 2) −0.5V to +7.0V
Input Cur rent (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

Current Applied to Output

in LOW State (Max) twice th erated I
DC Latchup Source Current −5 00 mA
Over Voltage Latchup (I/O) 10V

OL

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

CC

(mA)

Note 1: Absolute maximum ratings are values beyond which the device
may be damaged or have its useful life impair ed. 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

Symbol Parameter Min Typ Max Units

V

Input HIGH Voltage 2.0 V Recognized HIGH Signal

IH

V

Input LOW Voltage 0.8 V Recognized LOW Signal

IL

V

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

CD

V

Output HIGHVoltage 2.5 V Min IOH = −3 mA

OH

2.0 V Min IOH = −32 mA

V

Output LOWVoltage 0.55 IOL = 64 mA

OL

I

Input HIGH Current 1 µAMaxVIN = 2.7V (Note 4)

IH

1V

I

Input HIGH Current Breakdown Test 7 µAMaxVIN = 7.0V

BVI

I

Input LOW Current −1

IL

−1V

V

Input Leakage Test 4.75 V 0.0 IID = 1.9 µA

ID

I

Output Leakage Current 10 µA0 − 5.5V

OZH

I

Output Leakage Current −10 µA0 − 5.5V

OZL

I

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

OS

I

Output High Leakage Current 50 µAMaxV

CEX

I

Bus Drainage Test 100 µA0.0V

ZZ

I

Power Supply Current 50 µA Max All Outputs HIGH

CCH

I

Power Supply Current 30 mA Max All Outputs LOW

CCL

I

I

Power Supply Current

CCZ

Additional ICC/Input Outputs Enabled 2.5 mA

CCT

50 µAMax

Outputs 3-STATE 2.5 mA Enable Input VI = VCC − 2.1V
Outputs 3-STATE 50 µA Data Input VI = VCC − 2.1V

I

Dynamic I

CCD

CC

(Note 4) 0.1

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

No Load mA/

< 0.8 mA/MHz.

CCD

MHz

V

CC

µAMax

VIN = 0.5V (Note 4)

All Other Pins Grounded
V
V

OEn = VCC,
All Others at VCC or Ground
VI = VCC − 2.1V

Max

All Others at VCC or Ground
Outputs OPEN

Max

OEn = GND, (Note 3)
One Bit To ggling, 50% Duty Cycle

Conditions

= V

IN

CC

= 0.0V

IN

= 2.7V; OEn = 2.0V

OUT

= 0.5V; OEn = 2.0V

OUT

= 0.0V

OUT

= V

OUT

CC

= 5.5V; All Others GND

OUT

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DC Electrical Characteristics

(SOIC package)

Symbol Parameter Min Typ Max Units

V

Quiet Output Maximum Dynamic V

OLP

V

Quiet Output Minimum Dynamic V

OLV

V

Minimum HIGH Level Dynamic Output Voltage 2.7 3.1 V 5.0 TA = 25°C (Note 7)

OHV

Minimum HIGH Level Dynamic Input Voltage 2.0 1.5 V 5.0 TA = 25°C (Note 6)

V

IHD

V

Maximum LOW Level Dynamic Input Voltage 1.1 0.8 V 5.0 TA = 25°C (Note 6)

ILD

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 tes t ed.
Note 6: Max number of data inputs (n) s witc hing. n − 1 inputs switching 0V to 3V. Input-under-test switching: 3V to threshold (V

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

OL

OL

−1.3 −0.8 V 5.0 TA = 25°C (Note 5)

0.5 0.8 V 5.0 TA = 25°C (Note 5)

V

CC

AC Electrical Characteristics

(SOIC and SSOP package)

Symbol Parameter

t
t
t
t
t
t

PLH
PHL
PZH
PZL
PHZ
PLZ

Propagation Delay 1.0 2.5 3.6 1.0 5.3 1.0 3.6
Data to Outputs 1.0 2.3 3.6 1.0 5.0 1.0 3.6
Output Enable 1.5 3.5 6.0 0.8 6.5 1.5 6.0
Time 1.5 3.6 6.0 1.2 7.9 1.5 6.0
Output Disable 1.7 3.5 5.6 1.2 7.6 1.7 5.6
Time 1.7 3.3 5.6 1.0 7.9 1.7 5.6

TA = +25°CT

= −55°C to +125°CTA = −40°C to +85°C

A

VCC = +5V VCC = 4.5V–5.5V VCC = 4.5V–5.5V

CL = 50 pF CL = 50 pF CL = 50 pF

Min Typ Max Min Max Min Max

Conditions
CL = 50 pF,

= 500Ω

R

L

), 0V to threshold (V

ILD

IHD

Units

ns

ns

ns

74ABT244

).

Extended AC Electrical Characteristics

(SOIC package)

Symbol Parameter

f

TOGGLE

t

PLH

t

PHL

t

PZH

t

PZL

t

PHZ

t

PLZ

Max Toggle Frequency 100 MHz
Propagation Delay 1.5 5.0 1.5 6.0 2.5 8.5
Data to Outputs 1.5 5.0 1.5 6.0 2.5 8.5
Output Enable Time 1.5 6.5 2.5 7.5 2.5 10.0

Output Disable Time 1.0 5.6

Note 8: This specification is guaranteed but not tested. The limits apply to propagation delay s fo r all paths described swit c hing in phase
(i.e., all LOW-to-HIGH, HIGH-to-LOW, etc.).

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

Note 10: This specific at ion is guaranteed bu t n ot te s te d. T he limits represent propagation delays for all paths described swit c hing 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 d elays are dominated by th e R C network (500Ω, 250 pF) on the output and have been excluded from the datasheet.

−40°C to +85°CT

T

A

= −40°C to +85°CTA = −40°C to +85°C

A

VCC = 4.5V–5.5V VCC = 4.5V–5.5V VCC = 4.5V–5.5V

C

= 50 pF CL = 250 pF CL = 250 pF

L

8 Outputs Switching 1 Output Switching 8 Outputs Switching

(Note 8) (Note 9) (Note 10)

Min Typ Max Min Max M in Max

1.5 6.5 2.5 7.5 2.5 12.0

1.0 5.6

(Note 11) (Note 11) ns

Units

ns

ns

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