Datasheet SN54BCT126AJ, SN74BCT126AD, SN74BCT126ADR, SN74BCT126AN, SNJ54BCT126AFK Datasheet (Texas Instruments)

SN54BCT126A, SN74BCT126A

QUADRUPLE BUS BUFFER GATES

WITH 3-STATE OUTPUTS

SCBS252A – SEPTEMBER 1988 – REVISED APRIL 1994

Copyright  1994, Texas Instruments Incorporated

2–1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

• State-of-the-Art BiCMOS Design

Significantly Reduces I

CCZ

• 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 (D) Packages, Ceramic Chip
Carriers (FK) and Flatpacks (W), and
Standard Plastic and Ceramic 300-mil
DIPs (J, N)

description

The ′BCT126A bus buffer features independent
line drivers with 3-state outputs. Each output is
disabled when the associated output-enable (OE)
input is low.

The SN54BCT126A is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74BCT126A is characterized for
operation from 0°C to 70°C.

FUNCTION TABLE
(each buffer)

INPUTS

OUTPUT

OE A

Y

H H H
H LL
L X Z

SN54BCT126A ...J OR W PACKAGE
SN74BCT126A ...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

3212019

910111213

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

SN54BCT126A . . . 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.

SN54BCT126A, SN74BCT126A
QUADRUPLE BUS BUFFER GATES
WITH 3-STATE OUTPUTS

SCBS252A – SEPTEMBER 1988 – REVISED APRIL 1994

2–2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

logic symbol

†

logic diagram (positive logic)

EN

1

1OE

2

1A

1Y

3

4

2OE

5

2A

10

3OE

9

3A

13

4OE

12

4A

2Y

6

3Y

8

4Y

11

1

4

56

2A 2Y

2OE

1

23

1A

1Y

1OE

10

98

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.

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, VI (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: SN54BCT126A 96 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74BCT126A 128 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range: SN54BCT126A – 55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74BCT126A 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

SN54BCT126A SN74BCT126A

MIN NOM MAX MIN NOM MAX

UNIT

V

CC

Supply voltage 4.5 5 5.5 4.5 5 5.5 V

V

IH

High-level input voltage 2 2 V

V

IL

Low-level input voltage 0.8 0.8 V

I

IK

Input clamp current –18 –18 mA

I

OH

High-level output current –12 –15 mA

I

OL

Low-level output current 48 64 mA

T

A

Operating free-air temperature –55 125 0 70 °C

SN54BCT126A, SN74BCT126A

QUADRUPLE BUS BUFFER GATES

WITH 3-STATE OUTPUTS

SCBS252A – SEPTEMBER 1988 – REVISED APRIL 1994

2–3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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

SN54BCT126A SN74BCT126A

PARAMETER

TEST CONDITIONS

MIN TYP†MAX MIN TYP†MAX

UNIT

V

IK

VCC = 4.5 V, II = –18 mA –1.2 –1.2 V

IOH = –3 mA 2.4 3.3 2.4 3.3

V

OH

VCC = 4.5 V

IOH = –12 mA 2 3.2

V
IOH = –15 mA 2 3.1
IOL = 48 mA 0.38 0.55

V

OL

V

CC

= 4.5

V

IOL = 64 mA 0.42 0.55

V

I

I

VCC = 0, VI = 7 V 0.1 0.1 mA

I

IH

VCC = 5.5 V, VI = 2.7 V 35 25 µA

I

IL

VCC = 5.5 V, VI = 0.5 V –20 –20 µA

I

OZH

VCC = 5.5 V, VO = 2.7 V 50 50 µA

I

OZL

VCC = 5.5 V, VO = 0.5 V –50 –50 µA

I

OS

‡

VCC = 5.5 V, VO = 0 –100 –225 –100 –225 mA

I

CCH

VCC = 5.5 V, Outputs open 21 33 21 33 mA

I

CCL

VCC = 5.5 V, Outputs open 35 51 35 51 mA

I

CCZ

VCC = 5.5 V, Outputs open 5 10 5 10 mA

C

i

VCC = 5 V, VI = 2.5 V or 0.5 V 4 4 pF

C

o

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 Ω,
R2 = 500 Ω,
TA = 25°C

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

§

UNIT

′BCT126A SN54BCT126A SN74BCT126A

MIN TYP MAX MIN MAX MIN MAX

t

PLH

1.5 3.6 4.9 1.5 5.6 1.5 6.3

t

PHL

A

Y

2.7 5.3 6.9 2.7 7.7 2.7 7.4

ns

t

PZH

2.6 4.8 6.4 2.6 7.2 2.6 7.9

t

PZL

OE

Y

3.7 6.4 8.3 3.7 10.5 3.7 10

ns

t

PHZ

3.2 6.6 8.2 3.2 9.6 3.2 10

t

PLZ

OE

Y

3.4 6.5 8 3.4 12.3 3.4 10.7

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.

SN54BCT126A, SN74BCT126A
QUADRUPLE BUS BUFFER GATES
WITH 3-STATE OUTPUTS

SCBS252A – SEPTEMBER 1988 – REVISED APRIL 1994

2–4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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