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

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

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