HD74HC93P 查看數據表（PDF） - Renesas Electronics

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HD74HC93P

4-bit Binary Counter

Renesas Electronics 

HD74HC93

Test Circuit

VCC

Input

Pulse generator

Zout = 50 Ω

VCC

Output

A

B

R0(1)

R0(2)

QA

Output

CL = 50 pF

QB

Output

CL = 50 pF

QC

Output

CL = 50 pF

QD

CL = 50 pF

Note: CL includes the probe and jig capacitance.

Waveforms

• Waveform – 1

Count

Down

QA

QB

QC

QD

tr

tf

90%

10%

50%

10%

tPHL (Measure at tn+2)

50%

tPLH (Measure at tn+1)

90%

50%

10%

tTHL

tPHL (Measure at tn+4)

90%

50%

10%

tTLH

tPLH (Measure at tn+2)

90%

50%

10%

90%

50%

10%

tTHL

tPHL (Measure at tn+8)

tTLH

tPLH (Measure at tn+4)

90%

50%

10%

90%

50%

10%

tTHL

tPHL (Measure at tn+16)

tTLH

tPLH (Measure at tn+8)

90%

50%

10%

50%

10%

90%

tTHL

tTLH

Notes: 1. Input waveform: PRR ≤ 1 MHz, Zo = 50 Ω, tr ≤ 6 ns, tf ≤ 6 ns

2. tn is reference bit time when all outputs are low.

VCC

0V

VOH

VOL

VOH

VOL

VOH

VOL

VOH

VOL

Rev.2.00, Oct 06, 2005 page 5 of 7

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