Datasheet HD74BC240A Datasheet (HIT)

HD74BC240A

Octal Buffers/Line Drivers With 3 State Outputs

ADE-205-006A(Z)

2nd Edition

March 1993

Description

The HD74BC240A provides high drivability and operation equal to or better than high speed bipolar
standard logic IC by using Bi-CMOS process. The device features low power dissipation that is about 1/5
of high speed bipolar logic IC, when the frequency is 10 MHz. The device has eight inverter drivers with
three state outputs in a 20 pin package. This device is a non inverting buffer and has two active low
enables (1G and 2G). Each enable independently controls 4 buffers.

Features

• Input/Output are at high impedance state when power supply is off.

• Built in input pull up circuit can make input pins be open, when not used.

• TTL level input

• Wide operating temperature range

Ta = –40 to + 85°C

Function Table

Inputs
G A Output Y

HX Z
LH L
LL H

H : High level
L : Low level
X : Immaterial
Z : High impedance

HD74BC240A

Pin Arrangement

1G

V

1

20

CC

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

2Y1

GND

2
3
4
5

6
7

8

9

10

19
18
17
16
15
14
13
12
11

2G
1Y1
2A4

1Y2
2A3

1Y3
2A2
1Y4
2A1

(Top view)

Absolute Maximum Ratings

Item Symbol Rating Unit

Supply voltage V
Input diode current I
Input voltage V
Output voltage V
Off state output voltage V

CC

IK

IN

OUT

OUT(off)

Storage temperature Tstg –65 to +150 °C
Note: 1. The absolute maximum ratings are values which must not individually be exceeded, and

furthermore, no two of which may be realized at the same time.

–0.5 to +7.0 V
±30 mA
–0.5 to +7.5 V
–0.5 to +7.5 V
–0.5 to +5.5 V

2

HD74BC240A

Recommended Operating Conditions

Item Symbol Min Typ Max Unit

Supply voltage V
Input voltage V
Output voltage V

CC

IN

OUT

Operating temperature Topr –40 — 85 °C
Input rise/fall time*

1

tr, t

f

Note: 1. This item guarantees maximum limit when one input switches.

Waveform: Refer to test circuit of switching characteristics.

Logic Diagram

1G

4.5 5.0 5.5 V
0—VCCV
0—VCCV

0 — 8 ns/V

2G

1A1

2Y4

1A2

2Y3

1A3

2Y2

1A4

2Y1

1Y1

2A4

1Y2

2A3

1Y3

2A2

1Y4

2A1

3

HD74BC240A

Electrical Characteristics (Ta = –40°C to +85°C)

Item Symbol VCC(V) Min Max Unit Test Conditions

Input voltage V

Output voltage V

IH

V

IL

OH

4.5 2.4 — V IOH = –3 mA

4.5 2.0 — V IOH = –15 mA

V

OL

4.5 — 0.5 V IOL = 48 mA

4.5 — 0.55 V IOL = 64 mA
Input diode voltage V
Input current I

IK

I

4.5 — –1.2 V IIN = –18 mA

5.5 — –250 µAV

5.5 — 1.0 µAV

5.5 — 100 µAV
Short circuit output current*1I
Off state output current I

Supply current I

OS

OZH

I

OZL

CCL

I

CCH

I

CCZ

2

I

*

CCT

5.5 –100 –225 mA VIN = 0 or 5.5 V

5.5 — 50 µAV

5.5 — –50 µAV

5.5 — 27.5 mA VIN = 0 or 5.5 V

5.5 — 2.5 mA VIN = 0 or 5.5 V

5.5 — 2.5 mA VIN = 0 or 5.5 V

5.5 — 1.5 mA VIN = 3.4 or 0.5 V
Notes: 1. Not more than one output should be shorted at a time and duration of the short circuit should not

exceed one second.

2. When input by the TTL level, it shows I

2.0 — V
— 0.8 V

increase at per one input pin.

CC

= 0 V

IN

= 5.5 V

IN

= 7.0 V

IN

= 2.7 V

O

= 0.5 V

O

All outputs is “L”

All outputs is “H”

All outputs is “Z”

4

Switching Test Method (CL = 50 pF)

HD74BC240A

Ta = 25°C
V

= 5.0 V

CC

Ta = –40 to 85°C
VCC = 5.0 V ±10%

Item Symbol Min Max Min Max Unit Test Conditions

Propagation delay time t

Output enable time t

Output disable time t

Input capacitanse C
Output capacitance C

PLH

t

PHL

ZH

t

ZL

HZ

t

LZ

IN

O

3.0 6.0 3.0 7.0 ns See under figure

3.0 6.0 3.0 7.0

3.0 8.0 3.0 10.0 ns

3.0 8.0 3.0 10.0

3.0 7.0 3.0 9.0 ns

3.0 7.0 3.0 9.0

3.0(Typ) — pF VIN = VCC or GND

15.0(Typ) — pF VO = VCC or GND

Test Circuit

V

G

1A1

1A2

1A3

1A4

CC

1Y1

1Y2

1Y3

Output

Output

C =

L

450 Ω

50 pF

50 ScopeΩ

Same as above
load circuit

Same as above
load circuit

500 Ω

*3

OPEN
7 V

Pulse Generator

Z

out

= 50

Ω

V

CC

Input

See Function Table

1Y4

Notes: 1. CL includes probe and jig capacitance.

2. 2G, 2A1-2A4 to 2Y1-2Y4 are identical to above load circuit.

3. Open: t
7 V: tZL, t

PLH

, t

, tZH, t

PHL

LZ

HZ

Same as above
load circuit

5

HD74BC240A

Waveforms-1

t

f

90%

Input A

1.5 V

Output Y

Notes: 1. tr = 2.5 ns, tf = 2.5 ns

2. Input waveform: PRR =1 MHz, duty cycle 50%

Waveforms-2

t

Input G

1.5 V
10%

10% 10%

t

PLH

1.5 V

f

t

ZL

t

r

10%

90%90%

1.5 V

t

LZ

t

r

1.5 V

90%

t

PHL

1.5 V

3 V

0 V

V

OH

V

OL

3 V

0 V

3.5 V

Waveform–A

Waveform–B

Notes: 1. tr = 2.5 ns, tf = 2.5 ns

2. Input waveform: PRR = 1 MHz, duty cycle 50%

3. Waveform-A shows input conditions such that the output is “L” level when enable by the
output control.

4. Waveform-B shows input conditions such that the output is “H” level when enable by the
output control.

6

1.5 V
V

+ 0.3 V

OL

t

ZH

t

HZ

V

– 0.3 V

OH

V

OL

V

OH

1.5 V

0 V

Package Dimensions

HD74BC240A

Unit: mm

7

Cautions

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received the latest product standards or specifications before final design, purchase or use.

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contact Hitachi’s sales office before using the product in an application that demands especially high
quality and reliability or where its failure or malfunction may directly threaten human life or cause risk
of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation,
traffic, safety equipment or medical equipment for life support.

4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly
for maximum rating, operating supply voltage range, heat radiation characteristics, installation
conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used
beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable
failure rates or failure modes in semiconductor devices and employ systemic measures such as fail­safes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other
consequential damage due to operation of the Hitachi product.

5. This product is not designed to be radiation resistant.

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