HD74LS247FP 查看數據表（PDF） - Renesas Electronics

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HD74LS247FP

BCD-to-Seven-Segment Decoder / Driver (with three-state outputs)

Renesas Electronics 

HD74LS247

Testing Method

Test Circuit

4.5V

P.G.

Zout = 50Ω

Input

VCC

a

A

b

B

c

C

D

d

LT

e

RBI

f

BI/RBO g

RL

Output

CL

Note: CL includes probe and jig capacitance.

Testing Table

Item

ton

toff

RBI

4.5V

4.5V

4.5V

IN

D

GND

GND

GND

GND

Inputs

C

GND

GND

4.5V

GND

B

GND

4.5V

4.5V

GND

A

IN

IN

IN

GND

a

OUT

—

—

OUT

b

—

—

OUT

OUT

c

—

OUT

—

OUT

Outputs

d

OUT

—

OUT

OUT

e

OUT

OUT

OUT

OUT

f

OUT

—

OUT

OUT

g

—

—

OUT

—

Waveform

tTLH

tTHL

90%

90%

3V

Input

1.3 V

1.3 V

10%

10%

0V

toff

ton

In phase output

1.3 V

ton

1.3 V

toff

VOH

VOL

Out of phase output

1.3 V

VOH

1.3 V

VOL

Note: Input pulse; tTLH ≤ 15 ns, tTHL ≤ 6 ns, PRR = 1 MHz, duty cycle = 50%

Rev.3.00, Jul.15.2005, page 5 of 7

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