HD74HC444 查看數據表（PDF） - Renesas Electronics
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HD74HC444 Datasheet PDF : 8 Pages
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HD74HC442, HD74HC443, HD74HC444
Switching Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Item
Propagation delay
time
Output enable
time
Output disable
time
Output rise/fall
time
Input capacitance
Symbol VCC (V)
tPLH
2.0
tPHL
4.5
6.0
tZH
2.0
tZL
4.5
6.0
tHZ
2.0
tLZ
4.5
6.0
tTLH
2.0
tTHL
4.5
6.0
Cin
—
Ta = 25°C
Min Typ Max
— — 200
— — 40
— — 34
— — 150
— — 30
— — 26
— — 150
— — 30
— — 26
— — 60
— — 12
— — 10
— 5 10
Ta = –40 to +85°C
Min
Max Unit
—
250 ns
—
50
—
43
—
190 ns
—
38
—
33
—
190 ns
—
38
—
33
—
75
ns
—
15
—
13
—
10
pF
Package Dimensions
JEITA Package Code
P-SOP20-7.5x12.8-1.27
RENESAS Code
PRSP0020DC-A
Previous Code
FP-20DBV
MASS[Typ.]
0.52g
Test Conditions
*1 D
F
20
11
NOTE)
1. DIMENSIONS"*1 (Nom)"AND"*2"
@ DO NOT INCLUDE MOLD FLASH.
2. DIMENSION"*3"DOES NOT
@ INCLUDE TRIM OFFSET.
Index mark
1
Z
e
*3 b p
10
xM
y
bp
Terminal cross section
( Ni/Pd/Au plating )
L1
L
Detail F
Reference Dimension in Millimeters
Symbol Min Nom Max
D
12.80 13.2
E
7.50
A2
A1 0.10 0.20 0.30
A
2.65
bp 0.34 0.40 0.46
b1
c 0.20 0.25 0.30
θ
c1
θ 0°
8°
HE 10.00 10.40 10.65
e
1.27
x
0.12
y
0.15
Z
0.935
L 0.40 0.70 1.27
L1
1.45
Rev.2.00 Mar 30, 2006 page 7 of 7
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