TEXAS INSTRUMENTS SN54BCT25244, SN74BCT25244 Technical data

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SN54BCT25244, SN74BCT25244

25-Ω OCTAL BUFFERS/DRIVERS

WITH 3-STATE OUTPUTS

SCBS064A – JUNE 1990 – REVISED NOVEMBER 1993

• State-of-the-Art BiCMOS Design

Significantly Reduces I

CCZ

• ESD Protection Exceeds 2000 V Per

MIL-STD-883C, Method 3015; Exceeds
200 V Using Machine Model (C = 200 pF,
R = 0)

• Designed to Facilitate Incident-Wave

Switching for Line Impedances of 25 Ω
or Greater

• Distributed V

and GND Pins Minimize

CC

Noise Generated by the Simultaneous
Switching of Outputs

• Package Options Include Plastic

Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK) and Flatpacks (W), and
Standard Plastic and Ceramic 300-mil DIPs
(JT, NT)

description

These 25-Ω 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.

These buffers are capable of sinking 188-mA IOL,
which facilitates switching 25-Ω transmission
lines on the incident wave. The distributed V
and GND pins minimize switching noise for more
reliable system operation.

When the output-enable (1OE
are low, the device transmits data from the
A inputs to the Y outputs. When 1OE
high, the outputs are in the high-impedance state.

and 2OE) inputs

and 2OE are

CC

SN54BCT25244 . . . JT OR W PACKAGE

SN74BCT25244 . . . DW OR NT PACKAGE

SN54BCT25244 . . . FK PACKAGE

1A3

V

CC

1A2

NC

1A1

1OE

1Y1

NC – No internal connection

(TOP VIEW)

1

24

1Y1

GND

GND

GND

GND

2
3

1Y2

4

1Y3

5
6

1Y4

7

2Y1

8
9

2Y2

10

2Y3

11
12

2Y4

(TOP VIEW)

1A4

2A1

2A2

3212827

426

5
6
7
8
9
10
11

12 13

14 15 16 17

1Y2

1Y3

GND

1OE

23

1A1

22

1A2

21

V

CC

20

1A3

19

1A4

18

2A1

17

2A2

16

V

CC

15

2A3

14

2A4

13

2OE

CC

NCV2A3

18

NC

1Y4

GND

2A4

25
24
23
22
21
20
19

2Y1

2OE
2Y4
GND
NC
2Y3
2Y2
GND

The SN54BCT25244 is characterized for
operation over the full military temperature range
of –55°C to 125°C. The SN74BCT25244 is
characterized for operation from 0°C to 70°C.

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

FUNCTION TABLE

(each buffer/driver)

INPUTS

OE A

L H H
L LL

H X Z

OUTPUT

Y

Copyright  1993, Texas Instruments Incorporated

2–1

SN54BCT25244, SN74BCT25244
25-Ω OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS

SCBS064A – JUNE 1990 – REVISED NOVEMBER 1993

24

23
22
20
19

13

18
17
15
14

†

EN

1

EN

1

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.

10
12

logic diagram (positive logic)

1OE

1

1Y1

3

1Y2

4

1Y3

6

1Y4

7

2Y1

9

2Y2
2Y3
2Y4

2OE

24

23 1

1A1

22 3

1A2

20 4

1A3

19 6

1A4

13

18 7

2A1

17 9

2A2 2Y2

1Y1

1Y2

1Y3

1Y4

2Y1

Pin numbers shown are for the DW, JT, NT, and W packages.

15 10

2A3

14 12

2A4

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, V
Input clamp current, I

(V

< 0) –30 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

IK

I

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

O

O

Current into any output in the low state, IO: SN54BCT25244 250 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74BCT25244 376 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range: SN54BCT25244 –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74BCT25244 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 negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.

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

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

–0.5 V to V

‡

CC

2–2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265