74HC640 查看數據表（PDF） - NXP Semiconductors.
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74HC640 Datasheet PDF : 6 Pages
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Philips Semiconductors
Octal bus transceiver; 3-state; inverting
Product specification
74HC/HCT640
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)
WAVEFORMS
min. typ. max. min. max. min. max.
tPHL/ tPLH
propagation delay
An to Bn;
Bn to An
30 90
11 18
9 15
115
135 ns 2.0 Fig.5
23
27
4.5
20
23
6.0
tPZH/ tPZL 3-state output enable time
44 150
190
225 ns 2.0 Fig.6
OE, DIR to An;
16 30
38
45
4.5
OE, DIR to Bn
13 26
33
38
6.0
tPHZ/ tPLZ 3-state output disable time
50 150
190
225 ns 2.0 Fig.6
OE, DIR to An;
18 30
38
45
4.5
OE, DIR to Bn
14 26
33
38
6.0
tTHL/ tTLH output transition time
14 60
75
90 ns 2.0 Fig.5
5 12
15
18
4.5
4 10
13
15
6.0
March 1988
4
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