SN54HCT244, SN74HCT244

OCTAL BUFFERS AND LINE DRIVERS

WITH 3-STATE OUTPUTS

SCLS175D – MARCH 1984 – REVISED AUGUST 2003

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Operating Voltage Range of 4.5 V to 5.5 V

High-Current Outputs Drive Up To 15

LSTTL Loads

Low Power Consumption, 80-µA Max I

Typical t

= 13 ns

±6-mA Output Drive at 5 V

Low Input Current of 1 µA Max

Inputs Are TTL-Voltage Compatible

3-State Outputs Drive Bus Lines or Buffer

Memory Address Registers

description/ordering information

These octal buffers and line drivers are designed

specifically to improve both the performance and

density of 3-state memory address drivers, clock

drivers, and bus-oriented receivers and

transmitters. The ’HCT244 devices 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.

ORDERING INFORMATION

PACKAGE

†

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

–40 C to 85 C

PDIP – N Tube of 20 SN74HCT244N SN74HCT244N

–40 C to 85 C

SOIC – DW

Tube of 25 SN74HCT244DW

HCT244

–40 C to 85 C

SOIC – DW

Reel of 2000 SN74HCT244DWR

HCT244

–40°C to 85°C

SOP – NS Reel of 2000 SN74HCT244NSR HCT244

–40°C to 85°C

SSOP – DB Reel of 2000 SN74HCT244DBR HT244

TSSOP – PW

Tube of 70 SN74HCT244PW

HT244

TSSOP – PW

Reel of 2000 SN74HCT244PWR

HT244

Reel of 250 SN74HCT244PWT

–55 C to 125 C

CDIP – J Tube of 20 SNJ54HCT244J SNJ54HCT244J

–55

C to 125

CFP – W Tube of 85 SNJ54HCT244W SNJ54HCT244W

LCCC – FK Tube of 55 SNJ54HCT244FK SNJ54HCT244FK

†

Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are

available at www.ti.com/sc/package.

1OE

1A1

2Y4

1A2

2Y3

1A3

2Y2

1A4

2Y1

GND

2OE

1Y1

2A4

1Y2

2A3

1Y3

2A2

1Y4

2A1

SN54HCT244 ...J OR W PACKAGE

SN74HCT244 . . . DB, DW, N, NS, OR PW PACKAGE

(TOP VIEW)

3212019

910111213

1Y1

2A4

1Y2

2A3

1Y3

1A2

2Y3

1A3

2Y2

1A4

SN54HCT244 . . . FK PACKAGE

(TOP VIEW)

2Y4

1A1

1OE

1Y4

2A2

2OE

2Y1

2A1

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.

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.

On products compliant to MIL-PRF-38535, all parameters are tested

unless otherwise noted. On all other products, production

processing does not necessarily include testing of all parameters.

SN54HCT244, SN74HCT244

OCTAL BUFFERS AND LINE DRIVERS

WITH 3-STATE OUTPUTS

SCLS175D – MARCH 1984 – REVISED AUGUST 2003

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

FUNCTION TABLE

(each buffer/driver)

INPUTS

OUTPUT

OE A

OUTPUT

L H H

L LL

H X Z

logic diagram (positive logic)

1A1

1A2

1A3

1A4

1Y1

2A1

2A2

2A3

2A4

2Y1

1Y2

1Y3

1Y4

2Y2

2Y3

2Y4

2OE

1OE

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

†

Supply voltage range, V

–0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input clamp current, I

< 0 or V

> V

) (see Note 1) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output clamp current, I

< 0 or V

> V

) (see Note 1) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous output current, I

= 0 to V

) ±35 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous current through V

or GND ±70 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Package thermal impedance, θ

(see Note 2): DB package 70°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DW package 58°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

N package 69°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NS package 60°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PW package 83°C/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 package thermal impedance is calculated in accordance with JESD 51-7.

SN54HCT244, SN74HCT244

OCTAL BUFFERS AND LINE DRIVERS

WITH 3-STATE OUTPUTS

SCLS175D – MARCH 1984 – REVISED AUGUST 2003

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

recommended operating conditions (see Note 3)

SN54HCT244 SN74HCT244

UNIT

MIN NOM MAX MIN NOM MAX

UNIT

Supply voltage 4.5 5 5.5 4.5 5 5.5 V

High-level input voltage V

= 4.5 V to 5.5 V 2 2 V

Low-level input voltage V

= 4.5 V to 5.5 V 0.8 0.8 V

Input voltage 0 V

0 V

Output voltage 0 V

0 V

∆t/∆v Input transition rise/fall time 500 500 ns

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

NOTE 3: All unused inputs of the device must be held at V

or GND to ensure proper device operation. Refer to the TI application report,

Implications of Slow or Floating CMOS Inputs, literature number SCBA004.

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

otherwise noted)

PARAMETER

TEST CONDITIONS

= 25°C SN54HCT244 SN74HCT244

UNIT

PARAMETER

TEST CONDITIONS

MIN TYP MAX MIN MAX MIN MAX

UNIT

= V

or V

= –20 µA

4.5 V

4.4 4.499 4.4 4.4

= V

or V

= –6 mA

4.5 V

3.98 4.3 3.7 3.84

= V

or V

= 20 µA

4.5 V

0.001 0.1 0.1 0.1

= V

or V

= 6 mA

4.5 V

0.17 0.26 0.4 0.33

= V

or 0 5.5 V ±0.1 ±100 ±1000 ±1000 nA

= V

or 0, V

= V

or V

5.5 V ±0.01 ±0.5 ±10 ±5 µA

= V

or 0, I

= 0 5.5 V 8 160 80 µA

∆I

†

One input at 0.5 V or 2.4 V,

Other inputs at 0 or V

5.5 V 1.4 2.4 3 2.9 mA

4.5 V

to 5.5 V

3 10 10 10 pF

†

This is the increase in supply current for each input that is at one of the specified TTL voltage levels, rather than 0 V or V

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

= 50 pF

(unless otherwise noted) (see Figure 1)

PARAMETER

FROM

= 25°C SN54HCT244 SN74HCT244

UNIT

PARAMETER

FROM

(INPUT)

(OUTPUT)

MIN TYP MAX MIN MAX MIN MAX

UNIT

4.5 V 15 28 42 35

5.5 V 13 25 38 32

4.5 V 21 35 53 44

5.5 V 19 32 48 40

dis

4.5 V 19 35 53 44

dis

5.5 V 18 32 48 40

4.5 V 8 12 18 15

5.5 V 7 11 16 14

Part #	SN54HCT244J
Description	Buffer/Line Driver 8-CH Non-Inverting 3-ST CMOS 20-Pin CDI
Category	IC
Availability	Out of Stock
Qty	0

SN54HCT244J

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