74HCT646N 查看數據表（PDF） - Philips Electronics
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74HCT646N Datasheet PDF : 12 Pages
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Philips Semiconductors
Octal bus transceiver/register; 3-state
Product specification
74HC/HCT646
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
SYMBOL
PARAMETER
74HCT
+25
−40 to +85
−40 to +125
UNIT
VCC
(V)
WAVEFORMS
min. typ. max. min. max. min. max.
tPHL/ tPLH propagation delay
An,Bn to Bn,An
16 30
38
45 ns 4.5 Fig.6
tPHL/ tPLH propagation delay
CPAB,CPBA to Bn,An
23 44
55
66 ns 4.5 Fig.7
tPHL/ tPLH propagation delay
SAB,SBA to Bn,An
26 46
58
69 ns 4.5 Fig.8
tPZH/ tPZL 3-state output enable time
21 40
50
60 ns 4.5 Fig.9
OE to An,Bn
tPHZ/ tPLZ 3-state output disable time
20 35
44
53 ns 4.5 Fig.9
OE to An,Bn
tPZH/ tPZL 3-state output enable time
21 40
50
60 ns 4.5 Fig.10
DIR to An,Bn
tPHZ/ tPLZ 3-state output disable time
21 35
44
53 ns 4.5 Fig.10
DIR to An,Bn
tTHL/ tTLH output transition time
5 12
15
18 ns 4.5 Fig.6 and Fig.8
tW
clock pulse width
HIGH or LOW
16 8
20
24
CPAB or CPBA
tsu
set-up time
12 3
An,Bn to CPAB,CPBA
15
18
th
hold time
51
5
5
An,Bn to CPAB,CPBA
fmax
maximum clock pulse
30 77
24
20
frequency
ns 4.5 Fig.7
ns 4.5 Fig.7
ns 4.5 Fig.7
MHz 4.5 Fig.7
September 1993
8
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