TEXAS INSTRUMENTS SN54BCT244 Technical data

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SN54BCT244, SN74BCT244
OCTAL BUFFERS/DRIVERS

WITH 3-STATE OUTPUTS

SCBS006E – OCTOBER 1987 – REVISED APRIL 1994

• State-of-the-Art BiCMOS Design

Significantly Reduces I

CCZ

• P-N-P Inputs Reduce DC Loading

• ESD Protection Exceeds 2000 V

Per MIL-STD-883C, Method 3015

• 3-State Outputs Drive Bus Lines or Buffer

Memory Address Registers

• Package Options Include Plastic

Small-Outline (DW) and Shrink
Small-Outline (DB) Packages, Ceramic Chip
Carriers (FK) and Flatpacks (W), and
Standard Plastic and Ceramic 300-mil DIPs
(J, N)

description

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. Taken together with the ′BCT240
and ′BCT241, these devices provide the choice of
selected combinations of inverting and
noninverting outputs, symmetrical OE
output-enable) inputs, and complementary OE
and OE inputs.

(active-low

SN54BCT244 ...J OR W PACKAGE

SN74BCT244 . . . DB OR DW OR N PACKAGE

SN54BCT244 . . . FK PACKAGE

1A2
2Y3
1A3
2Y2
1A4

(TOP VIEW)

1OE

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

GND

3 2 1 20 19

4
5
6
7
8

9 10 11 12 13

1

20

2

19

3

18

4

17

5

16

6

15

7

14

8

13

9

12

10

11

(TOP VIEW)

2Y4

1A1

1OE

V

CC

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

CC

V

1Y1

18

2A4

17

1Y2

16

2A3

15

1Y3

14

The ′BCT244 is organized as two 4-bit buffers/line
drivers with separate output-enable (OE) inputs.
When OE is low, the device passes data from the
A inputs to the Y outputs. When OE

is high, the

outputs are in the high-impedance state.
The SN54BCT244 is characterized for operation

over the full military temperature range of –55°C
to 125°C. The SN74BCT244 is characterized for
operation from 0°C to 70°C.

FUNCTION TABLE

(each buffer)

INPUTS

OE A

L H H
L LL

H X Z

OUTPUT

Y

2Y1

GND

2A1

1Y4

2A2 2OE

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.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Copyright  1994, Texas Instruments Incorporated

2–1

SN54BCT244, SN74BCT244
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS

SCBS006E – OCTOBER 1987 – REVISED APRIL 1994

1

2
4
6
8

19

11
13
15
17

†

EN

EN

logic symbol

1OE

1A1
1A2
1A3
1A4

2OE

2A1
2A2
2A3
2A4

†

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

18
16
14
12

logic diagram (positive logic)

1OE

1Y1
1Y2
1Y3
1Y4

9

2Y1

7

2Y2

5

2Y3

3

2Y4

1A1

1A2

1A3

1A4

2OE

2A1

2A2

1

2

4

6

8

19

11

13

18

16

14

12

1Y1

1Y2

1Y3

1Y4

9

2Y1

7

2Y2

2A3

2A4

15

17 3

5

2Y3

2Y4

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

Supply voltage range, V

CC

Input voltage range, VI (see Note 1) – 0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Voltage range applied to any output in the disabled or power-off state, V
Voltage range applied to any output in the high state, VO – 0.5 V to V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

O

Current into any output in the low state: SN54BCT244 96 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74BCT244 128 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range: SN54BCT244 – 55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74BCT244 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range – 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.

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

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

– 0.5 V to 5.5 V. . . . . . . . . . . . . . .

‡

CC

2–2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

SN54BCT244, SN74BCT244

UNIT

PARAMETER

TEST CONDITIONS

UNIT

V

V

V

V

OCTAL BUFFERS/DRIVERS

WITH 3-STATE OUTPUTS

SCBS006E – OCTOBER 1987 – REVISED APRIL 1994

recommended operating conditions

SN54BCT244 SN74BCT244

MIN NOM MAX MIN NOM MAX

V

CC

V

IH

V

IL

I

IK

I

OH

I

OL

T

A

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

†

All typical values are at VCC = 5 V.

‡

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

Supply voltage 4.5 5 5.5 4.5 5 5.5 V
High-level input voltage 2 2 V
Low-level input voltage 0.8 0.8 V
Input clamp current –18 –18 mA
High-level output current –12 –15 mA
Low-level output current 48 64 mA
Operating free-air temperature –55 125 0 70 °C

SN54BCT244 SN74BCT244

MIN TYP†MAX MIN TYP†MAX

V

IK

V

OH

I

I

I

IH

I

IL

I

OZH

I

OZL

I

OS

I

CCH

I

CCL

I

CCZ

OL

‡

VCC = 4.5 V, II = –18 mA –1.2 –1.2 V

IOH = –3 mA 2.4 3.3 2.4 3.3

VCC = 4.5 V

= 4.5

CC

VCC = 5.5 V, VI = 7 V 0.1 0.1 mA
VCC = 5.5 V, VI = 2.7 V 20 20 µA
VCC = 5.5 V, VI = 0.5 V –1 –1 mA
VCC = 5.5 V, VO = 2.7 V 50 50 µA
VCC = 5.5 V, VO = 0.5 V –50 –50 µA
VCC = 5.5 V, VO = 0 –100 –225 –100 –225 mA
VCC = 5.5 V, Outputs open 23 40 23 40 mA
VCC = 5.5 V, Outputs open 53 80 53 80 mA
VCC = 5.5 V, Outputs open 4 10 4 10 mA

IOH = –12 mA 2 3.2
IOH = –15 mA 2 3.1
IOL = 48 mA 0.38 0.55
IOL = 64 mA 0.42 0.55

V

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

2–3

SN54BCT244, SN74BCT244

A

Y

ns

OE

Y

ns

OE

Y

ns

OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS

SCBS006E – OCTOBER 1987 – REVISED APRIL 1994

switching characteristics (see Note 2)

VCC = 5 V,
CL = 50 pF,

PARAMETER

t

PLH

t

PHL

t

PZH

t

PZL

t

PHZ

t
†
NOTE 2: Load circuits and voltage waveforms are shown in Section 1.

PLZ

For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.

FROM

(INPUT)

TO

(OUTPUT)

R1 = 500 Ω,
R2 = 500 Ω,
TA = 25°C

′BCT244 SN54BCT244 SN74BCT244

MIN TYP MAX MIN MAX MIN MAX

1.2 2.5 4.4 0.9 5.3 0.9 5

1.7 3.2 5 1.4 6 1.4 5.5
2 5.7 7.8 2 9 2 8.7
2 5.9 8.1 2 9.4 2 8.9
2 5.4 6.7 2 8 2 7.7
2 6.1 7.6 2 9.8 2 8.9

VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
TA = MIN to MAX

†

UNIT

2–4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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