MC74VHCT245A(2001) 查看數據表（PDF） - ON Semiconductor

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MC74VHCT245A
(Rev.:2001)

Octal Bus Transceiver

ON Semiconductor 

MC74VHCT245A

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ AC ELECTRICAL CHARACTERISTICS (Input tr = tf = 3.0ns)

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Symbol

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tPLH,

tPHL

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tPZL,

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tPZH

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tPLZ,

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tPHZ

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tOSLH,

tOSHL

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Cin

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Cout

Parameter

Maximum Propagation Delay

A to B or B to A

Output Enable Time

OE to A or B

Output Disable Time

OE to A or B

Output to Output Skew

Maximum Input Capacitance

Maximum Three–State Output

Capacitance (Output in

High–Impedance State)

Test Conditions

VCC = 5.0 ± 0.5V CL = 15pF

CL = 50pF

VCC = 5.0 ± 0.5V CL = 15pF

RL = 1kΩ

CL = 50pF

VCC = 5.0 ± 0.5V CL = 50pF

RL = 1kΩ

VCC = 5.0 ± 0.5V CL = 50pF

(Note 1.)

TA = 25°C

Min

Typ

Max

4.9

7.7

5.4

8.7

9.4

13.8

9.9

14.8

10.1

15.4

1.0

4

10

13

TA = – 40 to 85°C

Min

Max Unit

1.0

8.5

ns

1.0

9.5

1.0

15.0 ns

1.0

16.0

1.0

16.5 ns

1.0

ns

10

pF

pF

Typical @ 25°C, VCC = 5.0V

CPD Power Dissipation Capacitance (Note 2.)

16

pF

1. Parameter guaranteed by design. tOSLH = |tPLHm – tPLHn|, tOSHL = |tPHLm – tPHLn|.

2. CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load.

Average operating current can be obtained by the equation: ICC(OPR) = CPD  VCC  fin + ICC/8 (per bit). CPD is used to determine the no–load

dynamic power consumption; PD = CPD  VCC2  fin + ICC  VCC.

NOISE CHARACTERISTICS (Input tr = tf = 3.0ns, CL = 50pF, VCC = 5.0V)

Symbol

VOLP

VOLV

VIHD

VILD

Parameter

Quiet Output Maximum Dynamic VOL

Quiet Output Minimum Dynamic VOL

Minimum High Level Dynamic Input Voltage

Maximum Low Level Dynamic Input Voltage

TA = 25°C

Typ

Max

Unit

1.2

1.6

V

–1.2

–1.6

V

2.0

V

0.8

V

A or B

tPLH

B or A

1.5V

1.5V

3V

GND

tPHL

VOH

VOL

Figure 3. Switching Waveform

DIR

OE

A or B

A or B

3V

1.5V

GND

1.5V

tPZL

tPLZ

1.5V

tPZH

tPHZ

1.5V

3V

1.5V

GND

HIGH

IMPEDANCE

VOL +0.3V

VOH -0.3V

HIGH

IMPEDANCE

Figure 4. Switching Waveform

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