HD74HC244P 查看數據表（PDF） - Renesas Electronics

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HD74HC244P

Octal Buffers/Line Drivers/Line Receivers (with noninverted 3-state outputs)

Renesas Electronics 

HD74HC244

Switching Characteristics

Item

Symbol VCC (V)

Propagation delay tPHL

2.0

time

4.5

6.0

tPLH

2.0

4.5

6.0

Output enable time tZL

2.0

4.5

6.0

tZH

2.0

4.5

6.0

Output disable

time

tLZ

2.0

4.5

6.0

tHZ

2.0

4.5

6.0

Output rise/fall

time

tTLH

2.0

tTHL

4.5

6.0

Input capacitance Cin

—

Ta = 25°C

Min Typ Max

— — 90

— 12 18

— — 15

— — 90

— 10 18

— — 15

— — 150

— 11 30

— — 26

— — 150

— 12 30

— — 26

— — 150

— 16 30

— — 26

— — 150

— 19 30

— — 26

— — 60

— 4 12

— — 10

— 5 10

(CL = 50 pF, Input tr = tf = 6 ns)

Ta = –40 to +85°C

Unit

Min

Max

Test Conditions

—

115 ns

—

23

—

20

—

115 ns

—

23

—

20

—

190 ns

—

38

—

33

—

190 ns

—

38

—

33

—

190 ns

—

38

—

33

—

190 ns

—

38

—

33

—

75

ns

—

15

—

13

—

10

pF

Test Circuit

VCC

VCC

Input

Pulse Generator

Zout = 50 Ω

1G, 2G

Output

1Y1 to 2Y4

1A1 to 2A4

1 k Ω S1

CL =

50 pF

OPEN

GND

VCC

Note : 1. CL includes probe and jig capacitance.

TEST

tPLH / t PHL

tZH/ t HZ

tZL / t LZ

S1

OPEN

GND

VCC

Rev.2.00 Jan 31, 2006 page 4 of 7

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