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 SN54BCT125A, SN74BCT125A

 QUADRUPLE BUS BUFFER GATES

 WITH 3-STATE OUTPUTS

 SCBS032E – SEPTEMBER 1988 – REVISED APRIL 1994

Copyright 

©

 1994, Texas Instruments Incorporated

2–3

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

State-of-the-Art BiCMOS Design

Significantly Reduces I

CCZ

3-State Outputs Drive Bus Lines or Buffer

Memory Address Registers

Package Options Include Plastic

Small-Outline (D) Packages, Ceramic Chip

Carriers (FK) and Flatpacks (W), and

Standard Plastic and Ceramic 300-mil

DIPs (J, N)

  

description

The 

BCT125A bus buffer features independent

line drivers with 3-state outputs. Each output is

disabled when the associated output-enable (OE)

input is high.

The SN54BCT125A is characterized for operation

over the full military temperature range of – 55

°

C

to 125

°

C. The SN74BCT125A is characterized for

operation from 0

°

C to 70

°

C.

FUNCTION TABLE

    (each buffer)

INPUTS

OUTPUT

OE

A

Y

L

H

H

L

L

L

H

X

Z

logic symbol

logic diagram (positive logic)

EN

1

1OE

2

1A

1Y

3

4

5

2A

10

9

3A

13

12

4A

2Y

6

3Y

8

4Y

11

2OE

3OE

4OE

1

4

5

6

2A

2Y

2OE

1

2

3

1A

1Y

1OE

10

9

8

3A

3Y

3OE

13

12

11

4A

4Y

4OE

† This symbol is in accordance with ANSI/IEEE Std 91-1984

and IEC Publication 617-12.

Pin numbers shown are for the J, N, and W packages.

SN54BCT125A . . . J  OR  W  PACKAGE

SN74BCT125A . . . D  OR  N  PACKAGE

(TOP VIEW)

1

2

3

4

5

6

7

14

13

12

11

10

9

8

1OE

1A

1Y

2OE

2A

2Y

GND

V

CC

4OE

4A

4Y

3OE

3A

3Y

3

2

1 20 19

9 10 11 12 13

4

5

6

7

8

18

17

16

15

14

4A

NC

4Y

NC

3OE

1Y

NC

2OE

NC

2A

1A

1OE

NC

3Y

3A

V

4OE

2Y

GND

NC

SN54BCT125A . . . FK PACKAGE

(TOP VIEW)

CC

NC – No internal connection

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.

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SN54BCT125A, SN74BCT125A

QUADRUPLE BUS BUFFER GATES

WITH 3-STATE OUTPUTS

SCBS032E – SEPTEMBER 1988 – REVISED APRIL 1994

2–4

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

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

Supply voltage range, V

CC

– 0.5 V to 7 V

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

Input voltage range, V

I

 (see Note 1)

– 0.5 V to 7 V

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

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

O

– 0.5 V to 5.5 V

. . . . . . . . . . . . . . . 

Voltage range applied to any output in the high state, V

O

 

– 0.5 V to V

CC

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

Current into any output in the low state: SN54BCT125A

96 mA

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

SN74BCT125A

128 mA

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

Operating free-air temperature range:

SN54BCT125A

– 55

°

C to 125

°

C

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

SN74BCT125A

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.

recommended operating conditions

SN54BCT125A

SN74BCT125A

UNIT

MIN

NOM

MAX

MIN

NOM

MAX

UNIT

VCC

Supply voltage

4.5

5

5.5

4.5

5

5.5

V

VIH

High-level input voltage

2

2

V

VIL

Low-level input voltage

0.8

0.8

V

IIK

Input clamp current

–18

–18

mA

IOH

High-level output current

– 12

– 15

mA

IOL

Low-level output current

48

64

mA

TA

Operating free-air temperature

– 55

125

0

70

°

C

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 SN54BCT125A, SN74BCT125A

 QUADRUPLE BUS BUFFER GATES

 WITH 3-STATE OUTPUTS

 SCBS032E – SEPTEMBER 1988 – REVISED APRIL 1994

2–5

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

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

otherwise noted)

PARAMETER

TEST CONDITIONS

SN54BCT125A

SN74BCT125A

UNIT

PARAMETER

TEST CONDITIONS

MIN

TYP†

MAX

MIN

TYP†

MAX

UNIT

VIK

VCC = 4.5 V,

II = –18 mA

–1.2

–1.2

V

IOH = – 3 mA

2.4

3.3

2.4

3.3

VOH

VCC = 4.5 V

IOH = – 12 mA

2

3.2

V

IOH = – 15 mA

2

3.1

VOL

VCC = 4 5 V

IOL = 48 mA

0.38

0.55

V

 VOL

VCC = 4.5 V

IOL = 64 mA

0.42

0.55

V

II

VCC = 0,

VI = 7 V

0.1

0.1

mA

IIH

VCC = 5.5 V,

VI = 2.7 V

35

25

µ

A

IIL

VCC = 5.5 V,

VI = 0.5 V

– 20

– 20

µ

A

IOZH

VCC = 5.5 V,

VO = 2.7 V

50

50

µ

A

IOZL

VCC = 5.5 V,

VO = 0.5 V

– 50

– 50

µ

A

IOS‡

VCC = 5.5 V,

VO = 0

– 100

– 225

– 100

– 225

mA

ICCH

VCC = 5.5 V,

Outputs open

19

31

19

31

mA

ICCL

VCC = 5.5 V,

Outputs open

46

49

46

49

mA

ICCZ

VCC = 5.5 V,

Outputs open

6

14

6

14

mA

Ci

VCC = 5 V,

VI = 2.5 V or 0.5 V

4

4

pF

Co

VCC = 5 V,

VO = 2.5 V or 0.5 V

9

9

pF

† 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.

switching characteristics (see Note 2)

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

VCC = 5 V,

CL = 50 pF,

R1 = 500 

,

R2 = 500 

,

TA = 25

°

C

VCC = 4.5 V to 5.5 V,

CL = 50 pF,

R1 = 500 

,

R2 = 500 

,

TA = MIN to MAX§

UNIT

BCT125A

SN54BCT125A

SN74BCT125A

MIN

TYP

MAX

MIN

MAX

MIN

MAX

tPLH

A

Y

1.6

3.5

5.2

1.6

6

1.6

5.7

ns

tPHL

A

Y

2.7

5

6.9

2.7

8

2.7

7.7

ns

tPZH

OE

Y

3.4

6.7

9

3.4

11.1

3.4

10.3

ns

tPZL

OE

Y

5

8.2

10.4

5

12.8

5

11.7

ns

tPHZ

OE

Y

3

5.8

7.4

3

9.4

3

8.9

ns

tPLZ

OE

Y

2.8

5.5

7.3

2.8

9.9

2.8

8.6

ns

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

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

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SN54BCT125A, SN74BCT125A

QUADRUPLE BUS BUFFER GATES

WITH 3-STATE OUTPUTS

SCBS032E – SEPTEMBER 1988 – REVISED APRIL 1994

2–6

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

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Copyright 

©

 1998, Texas Instruments Incorporated