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MC74VHCT245A

Octal Bus Transceiver

ON Semiconductor 

MC74VHCT245A

A

DATA

PORT

A1 2

A2 3

A3 4

A4 5

A5 6

A6 7

A7 8

A8 9

18 B1

17 B2

16 B3

15 B4

14 B5

13 B6

12 B7

11 B8

B

DATA

PORT

DIR 1

OE 19

Figure 1. Logic Diagram

FUNCTION TABLE

Control Inputs

OE DIR

Operation

L

L Data Tx from Bus B to Bus A

L

H Data Tx from Bus A to Bus B

H

X Buses Isolated (High−Z State)

DIR 1

A1 2

A2 3

A3 4

A4 5

A5 6

A6 7

A7 8

A8 9

GND 10

20 VCC

19 OE

18 B1

17 B2

16 B3

15 B4

14 B5

13 B6

12 B7

11 B8

Figure 2. Pin Assignment

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

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ VI/O DCOutputVoltage

Outputs in 3−State – 0.5 to + 7.0

V

High or Low State – 0.5 to VCC + 0.5

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ IIK Input Diode Current

− 20

mA

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ IOK Output Diode Current (VOUT < GND; VOUT > VCC)

± 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

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Tstg Storage Temperature

– 65 to + 150

_C

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Maximum ratings are those values beyond which device damage can occur. Maximum ratings

applied to the device are individual stress limit values (not normal operating conditions) and are

not valid simultaneously. If these limits are exceeded, device functional operation is not implied,

damage may occur and reliability may be affected.

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

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

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.

RECOMMENDED OPERATING CONDITIONS

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Symbol

Parameter

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ VCC DC Supply Voltage

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Vin DC Input Voltage

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ VI/O DCOutputVoltage

Outputs in 3−State

High or Low State

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ TA Operating Temperature

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tr,tf InputRiseandFallTime

VCC =5.0V ±0.5V

Min

Max Unit

4.5

5.5

V

0

5.5

V

0

0

− 40

5.5

V

VCC

+ 85 _C

0

20 ns/V

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