SL74HC257 datasheet(4/5 Pages) SLS

4 / 5 page

SL74HC257

System Logic

Semiconductor

SLS

AC ELECTRICAL CHARACTERISTICS(C

L=50pF,Input t r=tf=6.0 ns)

VCC

Guaranteed Limit

Symbol

Parameter

°C to

-55

°C

≤85°C

≤125°C

Unit

tPLH, tPHL

Maximum Propagation Delay, Nibble A or B to

Output Y (Figures 1and 4)

2.0

4.5

6.0

100

125

150

tPLH, tPHL

Maximum Propagation Delay , Select to

Output Y (Figures 2 and 4)

2.0

4.5

6.0

100

125

150

tPLZ, tPHZ

Maximum Propagation Delay , Output Enable to

Output Y (Figures 3 and 5)

2.0

4.5

6.0

150

190

225

tPZL, tPZH

Maximum Propagation Delay , Output Enable to

Output Y (Figures 3 and 5)

2.0

4.5

6.0

150

190

225

tTLH, tTHL

Maximum Output Transition Time, Any Output

(Figures 1 and 4)

2.0

4.5

6.0

CIN

Maximum Input Capacitance

COUT

Maximum Three-State Output Capacitance

(Output in High-Impedance State)

Power Dissipation Capacitance (Per Package)

Typical @25

°C,V

CC=5.0 V

CPD

Used to determine the no-load dynamic power

consumption:

PD=CPDVCC

2f+I

CCVCC

Figure 1. Switching Waveforms

Figure 2. Switching Waveforms

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