74HCT244PW 查看數據表（PDF） - Philips Electronics
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74HCT244PW Datasheet PDF : 7 Pages
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Philips Semiconductors
Octal buffer/line driver; 3-state
Product specification
74HC/HCT244
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: bus driver
ICC category: MSI
Note to HCT types
The value of additional quiescent supply current (∆ICC) for a unit load of 1 is given in the family specifications.
To determine ∆ICC per input, multiply this value by the unit load coefficient shown in the table below.
INPUT
1An
2An
1OE
2OE
UNIT LOAD COEFFICIENT
0.70
0.70
0.70
0.70
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
1An to 1Yn;
2An to 2Yn
13 22
28
33 ns 4.5 Fig.5
tPZH/ tPZL 3-state output enable time
15 30
38
45 ns 4.5 Fig.6
1OE to 1Yn;
2OE to 2Yn
tPHZ/ tPLZ 3-state output disable time
15 25
31
38 ns 4.5 Fig.6
1OE to 1Yn;
2OE to 2Yn
tTHL/ tTLH output transition time
5 12
15
18 ns 4.5 Fig.5
December 1990
6
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