74LS645 datasheet(3/5 Pages) FAIRCHILD

Part #	74LS645

Description	Octal Bus Transceiver

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

Direct Link	http://www.fairchildsemi.com

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Switching Characteristics

at VCC = 5V and TA = 25°C

From (Input)

RL = 667Ω

Symbol

Parameter

To (Output)

CL = 45 pF

CL = 5 pF

Units

MinMax

tPLH

Propagation Delay Time

A to B

15

ns

LOW-to-HIGH Level Output

tPHL

Propagation Delay Time

A to B

15

ns

HIGH-to-LOW Level Output

tPLH

Propagation Delay Time

B to A

15

ns

LOW-to-HIGH Level Output

tPHL

Propagation Delay Time

B to A

15

ns

HIGH-to-LOW Level Output

tPZL

Output Enable Time

G to A

40

ns

to LOW Level

tPZH

Output Enable Time

G to A

40

ns

to HIGH Level

tPZL

Output Enable Time

G to B

40

ns

to LOW Level

tPZH

Output Enable Time

G to B

40

ns

to HIGH Level

tPLZ

Output Disable Time

G to A

25

ns

to LOW Level

tPHZ

Output Disable Time

G to A

25

ns

to HIGH Level

tPLZ

Output Disable Time

G to B

25

ns

to LOW Level

tPHZ

Output Disable Time

G to B

25

ns

to HIGH Level

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