Texas Instruments SN74AC244DBLE, SN74AC244DBR, SN74AC244DW, SN74AC244DWR, SN74AC244N Datasheet

SN54AC244, SN74AC244

OCTAL BUFFERS/DRIVERS

WITH 3-STATE OUTPUTS

SCAS514C – JUNE 1995 – REVISED SEPTEMBER 1996

1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

D

EPIC

 (Enhanced-Performance Implanted

CMOS) 1-µm Process

D

Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
(DB), and Thin Shrink Small-Outline (PW)
Packages, Ceramic Chip Carriers (FK), Flat
(W), and DIP (J, N) Packages

description

These octal buffers and line drivers are designed
specifically to improve the performance and
density of 3-state memory address drivers, clock
drivers, and bus-oriented receivers and
transmitters.

The ’AC244 are organized as two 4-bit
buffers/drivers with separate output-enable (OE

)
inputs. When OE is low, the device passes
noninverted data from the A inputs to the Y
outputs. When OE

is high, the outputs are in the

high-impedance state.
The SN54AC244 is characterized for operation

over the full military temperature range of –55°C
to 125°C. The SN74AC244 is characterized for
operation from –40°C to 85°C.

FUNCTION TABLE

(each buffer)

INPUTS

OUTPUT

OE A

Y

L H H
L LL
H X Z

Copyright  1996, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

EPIC is a trademark of Texas Instruments Incorporated.

SN54AC244 ...J OR W PACKAGE

SN74AC244 . . . DB, DW, N, OR PW PACKAGE

(TOP VIEW)

3 2 1 20 19

9 10 11 12 13

4
5
6
7
8

18
17
16
15
14

1Y1
2A4
1Y2
2A3
1Y3

1A2
2Y3
1A3
2Y2
1A4

SN54AC244 . . . FK PACKAGE

(TOP VIEW)

2Y4

1A1

1OE

1Y4

2A2 2OE

2Y1

GND

2A1

V

CC

1
2
3
4
5
6
7
8
9
10

20
19
18
17
16
15
14
13
12
11

1OE

1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1

GND

V

CC

2OE
1Y1
2A4
1Y2
2A3
1Y3
2A2
1Y4
2A1

SN54AC244, SN74AC244
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS

SCAS514C – JUNE 1995 – REVISED SEPTEMBER 1996

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

logic symbol

†

2

1A1

4

1A2

6

1A3

8

1A4

EN

1

1Y1

18

1Y2

16

1Y3

14

1Y4

12

11

2A1

13

2A2

15

2A3

17

2A4

EN

19

2Y1

9

2Y2

7

2Y3

5

2Y4

3

1OE

2OE

†

This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.

logic diagram (positive Logic)

1

2

4

6

8

12

14

16

18

1A1

1A2

1A3

1A4

1Y1

1Y2

1Y3

1Y4

1OE

19

11

13

15

17

3

5

7

9

2A1

2A2

2A3

2A4

2Y1

2Y2

2Y3

2Y4

2OE

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

‡

Supply voltage range, VCC –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage range, VI (see Note 1) –0.5 V to VCC + 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output voltage range, VO (see Note 1) –0.5 V to VCC + 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input clamp current, IIK (VI < 0 or VI > VCC) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output clamp current, I

OK

(VO < 0 or VO > VCC) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous output current, IO (VO = 0 to VCC) ±50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous current through VCC or GND ±200 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maximum power dissipation at TA = 55°C (in still air) (see Note 2): DB package 0.6 W. . . . . . . . . . . . . . . . . .

DW package 1.6 W. . . . . . . . . . . . . . . . . .

N package 1.3 W. . . . . . . . . . . . . . . . . . . .

PW package 0.7 W. . . . . . . . . . . . . . . . . .

Storage temperature range, T

stg

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

‡

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.

2. The maximum package power dissipation is calculated using a junction temperature of 150°C and a board trace length of 750 mils,
except for the N package, which has a trace length of zero.

SN54AC244, SN74AC244

OCTAL BUFFERS/DRIVERS

WITH 3-STATE OUTPUTS

SCAS514C – JUNE 1995 – REVISED SEPTEMBER 1996

3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

recommended operating conditions (see Note 3)

SN54AC244 SN74AC244

MIN MAX MIN MAX

UNIT

V

CC

Supply voltage 2 6 2 6 V

VCC = 3 V 2.1 2.1

V

IH

High-level input voltage

VCC = 4.5 V

3.15 3.15

V
VCC = 5.5 V 3.85 3.85
VCC = 3 V 0.9 0.9

V

IL

Low-level input voltage

VCC = 4.5 V

1.35 1.35

V
VCC = 5.5 V 1.65 1.65

V

I

Input voltage 0 V

CC

0 V

CC

V

V

O

Output voltage 0 V

CC

0 V

CC

V
VCC = 3 V –12 –12

I

OH

High-level output current

VCC = 4.5 V

–24 –24

mA
VCC = 5.5 V –24 –24
VCC = 3 V 12 12

I

OL

Low-level output current

VCC = 4.5 V

24 24

mA
VCC = 5.5 V 24 24

∆t/∆v Input transition rise or fall rate 0 8 0 8 ns/V
T

A

Operating free-air temperature –55 125 –40 85 °C

NOTE 3: Unused inputs must be held high or low to prevent them from floating.

SN54AC244, SN74AC244
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS

SCAS514C – JUNE 1995 – REVISED SEPTEMBER 1996

4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)

TA = 25°C SN54AC244 SN74AC244

PARAMETER

TEST CONDITIONS

V

CC

MIN TYP MAX MIN MAX MIN MAX

UNIT

3 V 2.9 2.9 2.9

IOH = –50 µA

4.5 V 4.4 4.4 4.4

5.5 V 5.4 5.4 5.4

IOH = –12 mA 3 V 2.56 2.4 2.46

V

OH

4.5 V 3.86 3.7 3.76

V

IOL = –24 mA

5.5 V 4.86 4.7 4.76

IOH = –50 mA

†

5.5 V 3.85

IOH = –75 mA

†

5.5 V 3.85
3 V 0.1 0.1 0.1

IOL = 50 µA

4.5 V 0.1 0.1 0.1

5.5 V 0.1 0.1 0.1

IOL = 12 mA 3 V 0.36 0.5 0.44

V

OL

4.5 V 0.36 0.5 0.44

V

I

OL

=

24 mA

5.5 V 0.36 0.5 0.44

IOL = 50 mA

†

5.5 V 1.65

IOL = 75 mA

†

5.5 V 1.65

Data inputs VI = VCC or GND

±0.1 ±1 ±1

I

I

Control inputs VI = VCC or GND

5.5 V

±0.1 ±1 ±1

µ

A

I

OZ

VO = VCC or GND,
V

I(OE)

= VIL or V

IH

5.5 V ±0.25 ±5 ±2.5 µA

I

CC

VI = VCC or GND, IO = 0 5.5 V 4 80 40 µA

C

i

VI = VCC or GND 5 V 2.5 pF

†

Not more than one output should be tested at a time, and the duration of the test should not exceed 10 ms.

switching characteristics over recommended operating free-air temperature range,
V

CC

= 3.3 V ± 0.3 V (unless otherwise noted) (see Figure 1)

FROM TO

TA = 25°C SN54AC244 SN74AC244

PARAMETER

(INPUT) (OUTPUT)

MIN TYP MAX MIN MAX MIN MAX

UNIT

t

PLH

2 6.5 9 1 12.5 1.5 10

t

PHL

A

Y

2 6.5 9 1 12 2 10

ns

t

PZH

2 6 10.5 1 11.5 1.5 11

t

PZL

OE

Y

2.5 7.5 10 1 13 2 11

ns

t

PHZ

3 7 10 1 12.5 1.5 10.5

t

PLZ

OE

Y

2.5 7.5 10.5 1 13 2.5 11.5

ns

SN54AC244, SN74AC244

OCTAL BUFFERS/DRIVERS

WITH 3-STATE OUTPUTS

SCAS514C – JUNE 1995 – REVISED SEPTEMBER 1996

5

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

switching characteristics over recommended operating free-air temperature range,
V

CC

= 5 V ± 0.5 V (unless otherwise noted) (see Figure 1)

FROM TO

TA = 25°C SN54AC244 SN74AC244

PARAMETER

(INPUT) (OUTPUT)

MIN TYP MAX MIN MAX MIN MAX

UNIT

t

PLH

1.5 5 7 1 9.5 1 7.5

t

PHL

A

Y

1.5 5 7 1 9 1 7.5

ns

t

PZH

1.5 5 7 1 9 1.5 8

t

PZL

OE

Y

1.5 5.5 8 1 10.5 1.5 8.5

ns

t

PHZ

2.5 6.5 9 1 10.5 1 9.5

t

PLZ

OE

Y

2 6.5 9 1 11 2 9.5

ns

operating characteristics, VCC = 5 V, TA = 25°C

PARAMETER TEST CONDITIONS TYP UNIT

C

pd

Power dissipation capacitance per buffer/driver CL = 50 pF, f = 1 MHz 45 pF

PARAMETER MEASUREMENT INFORMATION

From Output

Under Test

CL = 50 pF

(see Note A)

LOAD CIRCUIT

S1

2 × V

CC

500 Ω

500 Ω

t

PLH

t

PHL

Output

Control

(low-level

enabling)

Output

Waveform 1

S1 at 2 × V

CC

(see Note B)

Output

Waveform 2

S1 at Open

(see Note B)

V

OL

V

OH

t

PZL

t

PZH

t

PLZ

t

PHZ

50% V

CC

50% V

CC

50% V

CC

50% V

CC

[

V

CC

V

CC

0 V

50% V

CC

50% V

CC

V

OH

V

OL

0 V

50% V

CC

VOL + 0.3 V

50% V

CC

VOH – 0.3 V

[

0 V

V

CC

Open

Input

Output

VOLTAGE WAVEFORMS VOLTAGE WAVEFORMS

t

PLH/tPHL

t

PLZ/tPZL

t

PHZ/tPZH

Open

2 × V

CC

Open

TEST S1

NOTES: A. CL includes probe and jig capacitance.

B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.

Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr ≤2.5 ns, tf ≤ 2.5 ns.
D. The outputs are measured one at a time with one input transition per measurement.

Figure 1. Load Circuit and Voltage Waveforms

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