Datasheet SN74BCT2240DBLE, SN74BCT2240DBR, SN74BCT2240DW, SN74BCT2240DWR, SN74BCT2240N Datasheet (Texas Instruments)

SN54BCT2240, SN74BCT2240

OCTAL BUFFERS AND LINE/MOS DRIVERS

WITH 3-STATE OUTPUTS

SCBS030D – 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

• Output Ports Have Equivalent 33-Ω Series

Resistors, So No External Resistors Are
Required

• 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
SN74BCT2241 and ′BCT2244, these devices
provide the choice of selected combinations of
inverting and noninverting outputs, symmetrical
active-low output-enable (OE

) inputs, and
complementary OE and OE inputs. These devices
feature high fan-out and improved fan-in.

The ′BCT2240 is organized as two 4-bit 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 outputs, which are designed to source or sink

up to 12 mA, include 33-Ω series resistors to
reduce overshoot and undershoot.

The SN54BCT2240 is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74BCT2240 is characterized for
operation from 0°C to 70°C.

FUNCTION TABLE

(each buffer)

INPUTS

OUTPUT

OE

A

Y

L H L
L LH
H X Z

1
2
3
4
5
6
7
8
9
10

20
19
18
17
16
15
14
13
12
11

1OE

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

GND

V

CC

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

SN54BCT2240 ...J OR W PACKAGE

SN74BCT2240 . . . DB, DW, OR N PACKAGE

(TOP VIEW)

3212019

910111213

4
5
6
7
8

18
17
16
15
14

1Y1
2A4
1Y2
2A3
1Y3

1A2
2Y3
1A3
2Y2
1A4

SN54BCT2240 . . . FK PACKAGE

(TOP VIEW)

2Y4

1A1

1OE

1Y4

2A2 2OE

2Y1

GND

2A1

V

CC

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.

SN54BCT2240, SN74BCT2240
OCTAL BUFFERS AND LINE/MOS DRIVERS
WITH 3-STATE OUTPUTS

SCBS030D – SEPTEMBER 1988 – REVISED APRIL 1994

2–2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

logic symbol

†

logic diagram (positive logic)

1OE

2

1A1

4

1A2

6

1A3

8

1A4

EN

1

1Y1

18

1Y2

16

1Y3

14

1Y4

12

2OE

11

2A1

13

2A2

15

2A3

17

2A4

EN

19

2Y1

9

2Y2

7

2Y3

5

2Y4

3

1

2

4

6

8

19

11

13

15

17

3

5

7

9

12

14

16

18

1A1

1A2

1A3

1A4

1Y1

2A1

2A2

2A3

2A4

2Y1

1Y2

1Y3

1Y4

2Y2

2Y3

2Y4

1OE

2OE

schematic of Y outputs

Output

V

CC

GND

1

1

†

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

SN54BCT2240, SN74BCT2240

OCTAL BUFFERS AND LINE/MOS DRIVERS

WITH 3-STATE OUTPUTS

SCBS030D – SEPTEMBER 1988 – REVISED APRIL 1994

2–3

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, 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

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

Input clamp current, IIK –30 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Current into any output in the low state 24 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range: SN54BCT2240 – 55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74BCT2240 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

SN54BCT2240 SN74BCT2240

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 –12 mA

I

OL

Low-level output current 12 12 mA

T

A

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

SN54BCT2240, SN74BCT2240
OCTAL BUFFERS AND LINE/MOS DRIVERS
WITH 3-STATE OUTPUTS

SCBS030D – SEPTEMBER 1988 – REVISED APRIL 1994

2–4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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

SN54BCT2240 SN74BCT2240

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 = –1 mA 2.4 3.3 2.4 3.3

V

OH

V

CC

= 4.5

V

IOH = –12 mA 2 3.2 2 3.2

V

IOL = 1 mA 0.15 0.5 0.15 0.5

V

OL

V

CC

=

4.5 V

IOL = 12 mA 0.35 0.8 0.35 0.8

V

I

I

VCC = 5.5 V, VI = 7 V 0.1 0.1 mA

I

IH

VCC = 5.5 V, VI = 2.7 V 20 20 µA

I

IL

VCC = 5.5 V, VI = 0.5 V –1 –1 mA

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 19 32 19 32 mA

I

CCL

VCC = 5.5 V, Outputs open 46 76 46 76 mA

I

CCZ

VCC = 5.5 V, Outputs open 6 8 6 8 mA

†

All typical values are at VCC = 5 V, TA = 25°C.

†

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

switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, C

L

= 50 pF (unless otherwise noted) (see Note 2)

PARAMETER

FROM

TO

VCC = 5 V,

TA = 25°C

SN54BCT2240 SN74BCT2240

UNIT

(INPUT)

(OUTPUT)

MIN TYP MAX MIN MAX MIN MAX

t

PLH

0.5 3.4 4.8 0.5 6.3 0.5 5.7

t

PHL

A

Y

0.5 2.8 4 0.5 4.6 0.5 4.4

ns

t

PZH

2.6 6.2 8.2 2.6 10.1 2.6 9.3

t

PZL

OE

Y

4.3 8.8 10.9 4.3 12.9 4.3 12.4

ns

t

PHZ

2 5.3 7.1 2 9.2 2 8.7

t

PLZ

OE

Y

2.2 6.7 8.5 2.2 12.2 2.2 10.6

ns

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

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Copyright  1998, Texas Instruments Incorporated