HD74LS93 데이터 시트보기 (PDF) - Renesas Electronics

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HD74LS93

4-bit Binary Counter

Renesas Electronics 

HD74LS93

Testing Table

From input

Inputs

Outputs

Item

to output

A

B

R0

QA

QB

QC

QD

fmax

A→Q

IN

to QA

GND

Out

B→Q

4.5 V

IN

GND

—

Out

Out

Out

Out

Out

Out

A → QA

IN

to QA

GND

Out

—

—

—

A → QD

IN

to QA

GND

—

—

—

Out

tPLH

B → QB

4.5 V

IN

GND

—

Out

—

—

tPHL

B → QC

4.5 V

IN

GND

—

—

Out

—

B → QD

4.5 V

IN

GND

—

—

—

Out

R0** → Q

IN*

to QA

IN

Out

Out

Out

Out

* For initialized.

** Measured with each input and unused inputs at 4.5 V.

Waveform

1. fmax, tPLH, tPHL (Clock → Q)

tTLH

tTHL

3V

Clock

90% 90%

10%

1.3 V 10%

1.3 V

0V

tPHL(Measure at tn+2) tPLH (Measure at tn+1)

QA

VOH

1.3 V

1.3 V

VOL

tPHL (Measure at tn+4) tPLH (Measure at tn+2)

VOH

QB

1.3 V

1.3 V

VOL

tPHL (Measure at tn+8) tPLH (Measure at tn+4)

VOH

QC

1.3 V

1.3 V

VOL

tPHL (Measure at tn+16) tPLH (Measure at tn+8)

Notes:

VOH

QD

1.3 V

1.3 V

VOL

1. Input pulse; tTLH ≤ 15 ns, tTHL ≤ 5 ns, PRR = 1 MHz, duty cycle = 50% and for fmax.,

tTLH = tTHL ≤ 2.5 ns

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

Rev.2.00, Feb.18.2005, page 6 of 8

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