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MC74VHC240

Octal Bus Buffer/Line Driver Inverting with 3−State Outputs

ON Semiconductor 

A1 2

A2 4

A3 6

DATA

INPUTS

A4 8

B1 11

B2 13

B3 15

B4 17

18 YA1

16 YA2

14 YA3

12 YA4

9 YB1

INVERTING

OUTPUTS

7 YB2

5 YB3

3 YB4

OUTPUT OEA 1

ENABLES OEB 19

Figure 1. LOGIC DIAGRAM

MAXIMUM RATINGS*

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Symbol

Parameter

Value

Unit

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ VCC DC Supply Voltage

– 0.5 to + 7.0

V

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Vin DC Input Voltage

– 0.5 to + 7.0

V

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Vout DC Output Voltage

– 0.5 to VCC + 0.5 V

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ IIK Input Diode Current

− 20

mA

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ IOK Output Diode Current

± 20

mA

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Iout DC Output Current, per Pin

± 25

mA

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ ICC DC Supply Current, VCC and GND Pins

± 75

mA

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ PD Power Dissipation in Still Air,

SOIC Packages†

500

mW

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ TSSOP Package†

450

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Tstg StorageTemperature

– 65 to + 150

_C

* Absolute maximum continuous ratings are those values beyond which damage to the device

may occur. Exposure to these conditions or conditions beyond those indicated may

adversely affect device reliability. Functional operation under absolute−maximum−rated

conditions is not implied.

†Derating — SOIC Packages: – 7 mW/_C from 65_ to 125_C

TSSOP Package: − 6.1 mW/_C from 65_ to 125_C

RECOMMENDED OPERATING CONDITIONS

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Symbol

Parameter

Min

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ VCC DC Supply Voltage

2.0

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Vin

DC Input Voltage

0

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Vout DC Output Voltage

0

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ TA

Operating Temperature, All Package Types

− 40

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tr, tf

Input Rise and Fall Time

VCC = 3.3V ±0.3V 0

VCC =5.0V ±0.5V 0

Max Unit

5.5 V

5.5 V

VCC

V

+ 85 _C

100 ns/V

20

This device contains protection

circuitry to guard against damage

due to high static voltages or electric

fields. However, precautions must

be taken to avoid applications of any

voltage higher than maximum rated

voltages to this high−impedance cir-

cuit. For proper operation, Vin and

Vout should be constrained to the

range GND v (Vin or Vout) v VCC.

Unused inputs must always be

tied to an appropriate logic voltage

level (e.g., either GND or VCC).

Unused outputs must be left open.

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