Datasheet 74AC244SJX, 74AC244SJ, 74AC244SCX, 74AC244SC, 74AC244PC Datasheet (Fairchild Semiconductor)

November 1988
Revised November 1999

74AC244 • 74ACT244
Octal Buffer/Line Driv e r with 3-STATE Outputs

74AC244 • 74ACT244 Octal Buffer/Line Driver with 3-STATE Outputs

General Description

The AC/ACT244 is an octal buffer and lin e driver de sign ed
to be employed as a memory addre ss driver, clock driver
and bus-oriented transmitter/receiver which provides
improved PC board density.

Features

■ ICC and IOZ reduced by 50%

■ 3-STATE outputs drive bus lines or buffer memory

address registers

■ Outputs source/sink 24 mA

■ ACT244 has TTL-compatible inputs

Ordering Code:

Order Number Package Number Package Description

74AC244SC M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide Body
74AC244SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74AC244MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74AC244PC N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
74ACT244SC M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide Body
74ACT244SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74ACT244MSA MSA20 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
74ACT244MTC MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
74ACT244PC 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.

Logic Symbol

IEEE/IEC

Pin Descriptions

Pin Names Description

OE
I

0–I7

O

1

0–O7

, OE

3-STATE Output Enable Inputs

2

Inputs
Outputs

Truth Tables

Inputs Outputs

OE

1

Connection Diagram

FACT is a trademark of Fairchild Semiconductor Corporation.

© 1999 Fairchild Semiconductor Corporation DS009943 www.fairchildsemi.com

LL L
LH H
HX Z

OE

2

LL L
LH H
HX Z

X = Immaterial
Z = High Impedance

I

n

Inputs Outputs

I

n

(Pins 12, 14, 16, 18)

(Pins 3, 5, 7, 9)

Absolute Maximum Ratings(Note 1) Recommended Operating

Supply Voltage (VCC) −0.5V to +7.0V
DC Input Diode Current (I

V

= −0.5V −20 mA

I

= VCC + 0.5V +20 mA

V

I

DC Input Voltage (V
DC Output Diode Current (I

= −0.5V −20 mA

V

O

V

74AC244 • 74ACT244

= VCC + 0.5V +20 mA

O

DC Output Voltage (V

)

IK

) −0.5V to VCC + 0.5V

I

)

OK

) −0.5V to VCC + 0.5V

O

DC Output Source

or Sink Current (I

DC V

or Ground Current

CC

per Output Pin (I
Storage Temperature (T
Junction Temperature (T

) ±50 mA

O

or I

CC

) ±50 mA

GND

) −65°C to +150°C

STG

)

J

PDIP 140°C

Conditions

Supply Voltage ( V

AC 2.0V to 6.0V

ACT 4.5V to 5.5V
Input Voltage (V
Output Voltage (VO) 0V to V
Operating Temperature (TA) −40°C to +85°C
Minimum Input Edge Rate (∆V/∆t)

AC Devices

V

from 30% to 70% of V

IN

VCC @ 3.3V, 4.5V, 5.5V 125 mV/ns
Minimum Input Edge Rate (∆V/∆t)

ACT Devices

V

from 0.8V to 2.0V

IN

@ 4.5V, 5.5V 125 mV/ns

V

CC

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 ou tput/inp ut loadi ng varia bles. Fairchild does no t
recommend operat ion of FACT circuits outsid e databook specificat ions.

)

CC

) 0V to V

I

CC

DC Electrical Characteristics for AC

Symbol Parameter

Minimum HIGH Level 3.0 1.5 2.1 2.1 2.1 V

V

IH

Input Voltage 4.5 2.25 3.15 3.15 3.15 V or VCC − 0.1V

V

Maximum LOW Level 3.0 1.5 0.9 0.9 0.9 V

IL

Input Voltage 4.5 2.25 1.35 1.35 1.35 V or VCC − 0.1V

V

Minimum HIGH Level 3.0 2.99 2.9 2.9 2.9

OH

Output Voltage 4.5 4.49 4.4 4.4 4.4 V I

Maximum LOW Level 3.0 0.002 0.1 0.1 0.1

V

OL

Output Voltage 4.5 0.001 0.1 0.1 0.1 V I

I

Maximum Input

IN

(Note 4) Leakage Current
I

Maximum VI (OE) = VIL, V

OZ

3-STATE 5.5 ±0.25 ±5.0 ±2.5 µAVI = VCC, V
Current VO = VCC, GND

I

Minimum Dynamic 5.5 50 75 mA V

OLD

I

Output Current (Note 3) 5.5 −50 −75 mA V

OHD

I

Maximum Quiescent

CC

(Note 4) Supply Current or GND

Note 2: All outputs loaded; thresholds on input associated with output under test.
Note 3: Maximum test dura tio n 2. 0 ms, one output loaded at a time.

and ICC @ 3.0V are guaranteed to be less than or eq ual to the respective lim it @ 5. 5V VCC.

Note 4: I

IN

V

TA = +25°CTA = −55°Cto+125°CTA = −40°Cto+85°C

CC

(V) Typ Guaranteed Limits

5.5 2.75 3.85 3.85 3.85

5.5 2.75 1.65 1.65 1.65

5.5 5.49 5.4 5.4 5.4

3.0 2.56 2.4 2.46 IOH = 12 mA

4.5 3.86 3.7 3.76 V IOH = 24 mA

5.5 4.86 4.7 4.76 I

5.5 0.001 0.1 0.1 0.1

3.0 0.36 0.50 0.44 IOL = 12 mA

4.5 0.36 0.50 0.44 V IOL = 24 mA

5.5 0.36 0.50 0.44 IOL = 24 mA (Note 2)

5.5 ±0.1 ±1.0 ±1.0 µAVI = VCC, GND

5.5 4.0 80.0 40.0 µA

Units Conditions

= 0.1V

OUT

= 0.1V

OUT

= −50 µA

OUT

= 24 mA (Note 2)

OH

= 50 µA

OUT

GND

= 1.65V Max

OLD

= 3.85V Min

OHD

VIN = V

CC

CC
CC

IH

www.fairchildsemi.com 2

DC Electrical Characteristics for ACT

V

Symbol Parameter

V

Minimum HIGH Level 4.5 1.5 2.0 2.0 2.0

IH

CC

(V) Typ Guaranteed Limits

Input Voltage 5.5 1.5 2.0 2.0 2.0 or VCC − 0.1V

V

Maximum LOW Level 4.5 1.5 0.8 0.8 0.8

IL

Input Voltage 5.5 1.5 0.8 0.8 0.8 or V

V

Minimum HIGH Level 4.5 4.49 4.4 4.4 4.4

OH

Output Voltage 5.5 5.49 5.4 5.4 5.4

4.5 3.86 3.70 3.76 V IOH = 24 mA

5.5 4.86 4.70 4.76 I

Maximum LOW Level 4.5 0.001 0.1 0.1 0.1

V

OL

Output Voltage 5.5 0.001 0.1 0.1 0.1

4.5 0.36 0.50 0.44 V I

5.5 0.36 0.50 0.44 IOL = 24 mA (Note 5)

I

Maximum Input

IN

Leakage Current

I

Maximum 3-STATE

OZ

Current VO = VCC, GND

I

Maximum

CCT

ICC/Input

I

Minimum Dynamic 5.5 50 75 mA V

OLD

I

Output Current (Note 6) 5.5 −50 −75 mA V

OHD

I

Maximum Quiescent

CC

Supply Current or GND

Note 5: All outputs loaded; thres holds on input associated with output under test.
Note 6: Maximum test duration 2.0 ms, one output loaded at a time.

5.5 ±0.1 ±1.0 ±1.0 µAVI = VCC, GND

5.5 ±0.25 ±5.0 ±2.5 µA

5.5 0.6 1.6 1.5 mA VI = VCC − 2.1V

5.5 4.0 80.0 40.0 µA

TA = +25°CTA = −55°Cto+125°CTA =−40°Cto+85°C

Units Conditions

V

= 0.1V

OUT

V

V

= 0.1V

OUT

V

VI

OUT

− 0.1V

CC

= −50 µA

IOH = 12

= 24 mA (Note 5)

OH

VI

= 50 µA

OUT

IOL = 12 mA

= 24 mA

OL

VI = VIL, V

IH

= 1.65V Max

OLD

= 3.85V Min

OHD

VIN = V

CC

74AC244 • 74ACT244

3 www.fairchildsemi.com

AC Electrical Characteristics for AC

V

Symbol Parameter

CC

(V)

(Note 7) Min Typ Max Min Max Min Max

t

Propagation Delay 3.3 2.0 6.5 9.0 1.0 12.5 1.5 10.0

PLH

Data to Output 5.0 1.5 5.0 7.0 1.0 9.5 1.0 7.5
Propagation Delay 3.3 2.0 6.5 9.0 1.0 12.0 2.0 10.0

t

PHL

Data to Output 5.0 1.5 5.0 7.0 1.0 9.0 1.0 7.5

t

Output Enable Time 3.3 2.0 6.0 10.5 1.0 11.5 1.5 11.0

PZH

74AC244 • 74ACT244

t

Output Enable Time 3.3 2.5 7.5 10.0 1.0 13.0 2.0 11.0

PZL

5.0 1.5 5.0 7.0 1.0 9.0 1.5 8.0

5.0 1.5 5.5 8.0 1.0 10.5 1.5 8.5

Output Disable Time 3.3 3.0 7.0 10.0 1.0 12.5 1.5 10.5

t

PHZ

5.0 2.5 6.5 9.0 1.0 10.5 1.0 9.5

t

Output Disable Time 3.3 2.5 7.5 10.5 1.0 13.0 2.5 11.5

PLZ

5.0 2.0 6.5 9.0 1.0 11.0 2.0 9.5

Note 7: Voltage Range 3.3 is 3.3V ± 0.3V

Voltage Range 5.0 is 5.0V ± 0.5V

AC Electrical Characteristics for ACT

V

Symbol Parameter

t

Propagation Delay

PLH

Data to Output

t

Propagation Delay

PHL

Data to Output

t

Output Enable Time 5.0 1.5 6.0 8.5 1.0 9.5 1.0 9.5 ns

PZH

Output Enable Time 5.0 2.0 7.0 9.5 1.0 11.0 1.5 10.5 ns

t

PZL

t

Output Disable Time 5.0 2.0 7.0 9.5 1.0 11.0 1.5 10.5 ns

PHZ

t

Output Disable Time 5.0 2.5 7.5 10.0 1.0 11.5 2.0 10.5 ns

PLZ

Note 8: Voltage Range 5.0 is 5.0V ± 0.5V

CC

(V)

(Note 8) Min Typ Max Min Max Min Max

5.0 2.0 6.5 9.0 1.0 10.0 1.5 10.0 ns

5.0 2.0 7.0 9.0 1.0 10.0 1.5 10.0 ns

TA = +25°CT
C

= 50 pF CL = 50 pF CL = 50 pF

L

TA = +25°CT

= −55°C to +125°C TA = −40°C to +85°C

A

= −55°C to +125°C TA = −40°C to +85°C

A

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

Units

ns

ns

ns

ns

ns

ns

Units

Capacitance

Symbol Parameter Typ Units Conditions

C

IN

C

PD

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Input Capacitance 4.5 pF VCC = OPEN
Power Dissipation Capacitance 45.0 pF VCC = 5.0V

Physical Dimensions inches (millimeters) unless otherwise noted

74AC244 • 74ACT244

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

Package Number M20B

5 www.fairchildsemi.com

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

74AC244 • 74ACT244

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

www.fairchildsemi.com 6

Package Number M20D

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

74AC244 • 74ACT244

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

Package Number MSA20

7 www.fairchildsemi.com

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

74AC244 • 74ACT244

20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

www.fairchildsemi.com 8

Package Number MTC20

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

74AC244 • 74ACT244 Octal Buffer/Line Driver with 3-STATE Outputs

20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide

Fairchild does not assume any responsibility for use of any circuitry described , no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.

LIFE SUPPORT POLICY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are dev ic es or syste ms
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provide d in the l abe ling, can be rea­sonably expected to result in a significant injury to the
user.

Package Number N20A

2. A critical compo nent in any com ponen t of a life s upp ort
device or system whose failure to perform can be rea­sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.

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