74HC245 Ver la hoja de datos (PDF) - Philips Electronics
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74HC245 Datasheet PDF : 7 Pages
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Philips Semiconductors
Octal bus transceiver; 3-state
Product specification
74HC/HCT245
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
An
Bn
OE
DIR
UNIT LOAD COEFFICIENT
0.40
0.40
1.50
0.90
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 to Bn;
Bn to An
12 22
28
33 ns 4.5 Fig.5
tPZH/ tPZL 3-state output enable time
16 30
38
45 ns 4.5 Fig.6
OE to An;
OE to Bn
signalname DIR
tPHZ/ tPLZ 3-state output disable time
16 30
38
45 ns 4.5 Fig.6
OE to An;
OE to Bn
signalname DIR
tTHL/ tTLH output transition time
5 12
15
18 ns 4.5 Fig.5
September 1993
6
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