Datasheet SN54BCT125AJ, SN74BCT125AD, SN74BCT125ADR, SN74BCT125AN, SNJ54BCT125AFK Datasheet (Texas Instruments)

SN54BCT125A, SN74BCT125A

QUADRUPLE BUS BUFFER GATES

WITH 3-STATE OUTPUTS

SCBS032E – SEPTEMBER 1988 – REVISED APRIL 1994

• 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

OE A

L H H
L LL

H X Z

OUTPUT

Y

SN54BCT125A ...J OR W PACKAGE
SN74BCT125A ...D OR N PACKAGE

SN54BCT125A . . . FK PACKAGE

1Y

NC

2OE

NC

2A

NC – No internal connection

(TOP VIEW)

1

1OE

2

1A

3

1Y

4

2OE

5

2A

6

2Y

7

GND

(TOP VIEW)

1A

3212019

4
5
6
7
8

910111213

2Y

1OE

GND

14
13
12
11
10

NC

NC

9
8

CC

V

3Y

V

CC

4OE
4A
4Y
3OE
3A
3Y

4OE

18
17
16
15
14

3A

4A
NC
4Y
NC
3OE

1
2
4
5

10
9

13
12

†

1

EN

logic symbol

1OE

1A

2OE

2A

3OE

3A

4OE

4A

†

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.

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.

logic diagram (positive logic)

3

1Y

6

2Y

8

3Y

11

4Y

1OE

2OE

3OE

4OE

1

23

1A 1Y

4

56

2A 2Y

10

98

3A 3Y

13

12 11

4A 4Y

Copyright  1994, Texas Instruments Incorporated

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

2–3

SN54BCT125A, SN74BCT125A

UNIT

QUADRUPLE BUS BUFFER GATES
WITH 3-STATE OUTPUTS

SCBS032E – SEPTEMBER 1988 – REVISED APRIL 1994

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: 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.

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

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

recommended operating conditions

SN54BCT125A SN74BCT125A

MIN NOM MAX MIN NOM MAX

V
V
V
I
I
I
T

CC
IH

IL
IK
OH
OL

A

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

†

CC

2–4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

SN54BCT125A, SN74BCT125A

PARAMETER

TEST CONDITIONS

UNIT

V

V

V

V

A

Y

ns

OE

Y

ns

OE

Y

ns

QUADRUPLE BUS BUFFER GATES

WITH 3-STATE OUTPUTS

SCBS032E – SEPTEMBER 1988 – REVISED APRIL 1994

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

SN54BCT125A SN74BCT125A

MIN TYP†MAX MIN TYP†MAX

V

IK

V

OH

OL

I

I

I

IH

I

IL

I

OZH

I

OZL

‡

I

OS

I

CCH

I

CCL

I

CCZ

C

i

C

†

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.

o

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 = 0, VI = 7 V 0.1 0.1 mA
VCC = 5.5 V, VI = 2.7 V 35 25 µA
VCC = 5.5 V, VI = 0.5 V –20 –20 µA
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 19 31 19 31 mA
VCC = 5.5 V, Outputs open 46 49 46 49 mA
VCC = 5.5 V, Outputs open 6 14 6 14 mA
VCC = 5 V, VI = 2.5 V or 0.5 V 4 4 pF
VCC = 5 V, VO = 2.5 V or 0.5 V 9 9 pF

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

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

′BCT125A SN54BCT125A SN74BCT125A

MIN TYP MAX MIN MAX MIN MAX

1.6 3.5 5.2 1.6 6 1.6 5.7

2.7 5 6.9 2.7 8 2.7 7.7

3.4 6.7 9 3.4 11.1 3.4 10.3
5 8.2 10.4 5 12.8 5 11.7
3 5.8 7.4 3 9.4 3 8.9

2.8 5.5 7.3 2.8 9.9 2.8 8.6

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

§

UNIT

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

2–5

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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