74VHC245(2004) データシートの表示（PDF） - STMicroelectronics

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74VHC245
(Rev.:2004)

OCTAL BUS TRANSCEIVER (3-STATE)

STMicroelectronics 

74VHC245

Figure 2: Input Equivalent Circuit

Table 2: Pin Description

PIN N°

1

2, 3, 4, 5, 6,

7, 8, 9

18, 17, 16,

15, 14, 13,

12, 11

19

10

20

SYMBOL

DIR

A1 to A8

NAME AND FUNCTION

Directional Control

Data Inputs/Outputs

B1 to B8 Data Inputs/Outputs

G

GND

VCC

Output Enable Input

Ground (0V)

Positive Supply Voltage

Table 3: Truth Table

INPUTS

G

DIR

L

L

L

H

H

X

X : Don‘t Care

Z : High Impedance

Table 4: Absolute Maximum Ratings

FUNCTION

A BUS

OUTPUT

INPUT

Z

B BUS

INPUT

OUTPUT

Z

OUTPUT

A=B

B=A

Z

Symbol

Parameter

VCC Supply Voltage

VI

DC Input Voltage (DIR, G)

VI/O Bus I/O Voltage

VO

DC Output Voltage

IIK

DC Input Diode Current

IOK

DC Output Diode Current

IO

DC Output Current

ICC or IGND DC VCC or Ground Current

Tstg Storage Temperature

TL

Lead Temperature (10 sec)

Value

Unit

-0.5 to +7.0

V

-0.5 to +7.0

V

-0.5 to VCC + 0.5

V

-0.5 to VCC + 0.5

V

- 20

mA

± 20

mA

± 25

mA

± 75

mA

-65 to +150

°C

300

°C

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is

not implied

Table 5: Recommended Operating Conditions

Symbol

VCC

VI

VI/O

VO

Top

dt/dv

Parameter

Supply Voltage

Input Voltage (DIR, G)

Bus I/O Voltage

Output Voltage

Operating Temperature

Input Rise and Fall Time (note 1) (VCC = 3.3 ± 0.3V)

(VCC = 5.0 ± 0.5V)

1) VIN from 30% to 70% of VCC

2/12

Value

2 to 5.5

0 to 5.5

0 to VCC

0 to VCC

-55 to 125

0 to 100

0 to 20

Unit

V

V

V

V

°C

ns/V

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