HD74HC192FPEL 查看數據表（PDF） - Renesas Electronics

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HD74HC192FPEL

Synchronous Up/Down Decade Counter

Renesas Electronics 

HD74HC192, HD74HC193

Test Circuit

VCC

Input

Pulse Generator

Zout = 50 Ω

VCC

Output

Load Borrow

Up

Down

Clear Carry

A

B

C

QA to QD

D

Output

Output

CL = 50 pF

CL = 50 pF

CL = 50 pF

Note : 1. CL includes probe and jig capacitance.

Waveforms

• Waveform – 1 (HD74HC192)

tr

tf

Count

50%

Up

tw (H)

(Measure at tn+1) tPLH

90%

QA

50%

10%

50% 50%

tw (L)

tPHL (Measure at tn+2)

90%

50%

10%

50%

tTLH

tTHL

tPHL (Measure at tn+4)

tPLH (Measure at tn+2)

90%

90%

QB

50%

50%

10%

10%

tTHL

tPHL (Measure at tn+8)

tTLH

tPLH (Measure at tn+4)

QC

QD

Carry

90%

50%

10%

90%

50%

10%

tTHL

tPHL (Measure at tn+10)

tTLH

tPLH (Measure at tn+8)

90%

50%

10%

50%

10%

90%

(Measure before tPHL

1 clock of tn+10)

tTHL

tPLH (Measure at tn+10)

90%

50%

10%

90%

50%

tTLH

tTHL

tTLH

Notes : 1. Input pulse : 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

VOH

VOL

Rev.3.00, Jan 31, 2006 page 8 of 13

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