74HCT646U 查看數據表（PDF） - Philips Electronics
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74HCT646U Datasheet PDF : 12 Pages
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Philips Semiconductors
Product specification
Octal bus transceiver/register; 3-state
74HC/HCT646
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: bus driver
ICC category: MSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
SYMBOL
PARAMETER
74HC
+25
−40 to +85
−40 to +125
UNIT
VCC
(V)
min. typ. max. min. max. min. max.
WAVEFORMS
tPHL/ tPLH propagation delay
An,Bn to Bn,An
tPHL/ tPLH propagation delay
CPAB,CPBA to Bn,An
39 135
170
205 ns 2.0 Fig.6
14 27
34
41
4.5
11 23
29
35
6.0
66 220
275
330 ns 2.0 Fig.7
24 44
55
66
4.5
19 37
47
56
6.0
tPHL/ tPLH propagation delay
SAB,SBA to Bn,An
55 190
240
285 ns 2.0 Fig.8
20 38
48
57
4.5
16 32
41
48
6.0
tPZH/ tPZL
tPHZ/ tPLZ
3-state output enable
time
OE to An,Bn
3-state output disable
time OE to An,Bn
47 175
220
265 ns 2.0 Fig.9
17 35
44
53
4.5
14 30
37
45
6.0
58 175
220
265 ns 2.0 Fig.9
21 35
44
53
4.5
17 30
37
45
6.0
tPZH/ tPZL 3-state output enable
time DIR to An,Bn
50 175
220
265 ns 2.0 Fig.10
18 35
44
53
4.5
14 30
37
45
6.0
tPHZ/ tPLZ 3-state output disable
time DIR to An,Bn
tTHL/ tTLH output transition time
50 175
220
265 ns 2.0 Fig.10
18 35
44
53
4.5
14 30
37
45
6.0
14 60
75
90 ns 2.0 Fig.6 and Fig.8
5 12
15
18
4.5
4 10
13
15
6.0
tW
clock pulse width
HIGH or LOW
CPAB or CPBA
80 25
16 9
14 7
tsu
set-up time
An,Bn to CPAB,CPBA
60 −3
12 −1
10 −1
th
hold time
An,Bn to CPAB,CPBA
35 6
72
62
100
120
24
24
20
20
75
90
15
18
13
15
45
55
9
11
8
9
ns 2.0 Fig.7
4.5
6.0
2.0
ns 4.5 Fig.7
6.0
2.0
ns 4.5 Fig.7
6.0
fmax
maximum clock pulse
frequency
6.0 21
30 63
35 75
4.8
4.0
24
20
28
24
2.0
MHz 4.5 Fig.7
6.0
September 1993
6
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