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| 74HC240 Datasheet, PDF (6/7 Pages) NXP Semiconductors – Octal buffer/line driver; 3-state; inverting | |||
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Philips Semiconductors
Octal buffer/line driver; 3-state; inverting
Product speciï¬cation
74HC/HCT240
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see â74HC/HCT/HCU/HCMOS Logic Family Specificationsâ.
Output capability: bus driver
IICC category: MSI
Note to HCT types
The value of additional quiescent supply current (âICC) for a unit load of 1 is given in the family specifications.
To determine âICC per input, multiply this value by the unit load coefficient shown in the table below.
INPUT
1An
2An
1OE
2OE
UNIT LOAD COEFFICIENT
1.50
1.50
0.70
0.70
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
SYMBOL PARAMETER
tPHL/ tPLH
tPZH/ tPZL
tPHZ/ tPLZ
tTHL/ tTLH
propagation delay
1An to 1Yn;
2An to 2Yn
3-state output enable time
1OE to 1Yn;
2OE to 2Yn
3-state output disable time
1OE to 1Yn;
2OE to 2Yn
output transition time
Tamb (°C)
TEST CONDITIONS
min.
+25
typ. max.
74HCT
â40 to +85
min. max.
â40 to +125
min. max.
UNIT VCC
(V)
WAVEFORMS
11 20
25
30 ns 4.5 Fig.5
13 30
38
45 ns 4.5 Fig.6
13 25
31
38 ns 4.5 Fig.6
5 12
15
18 ns 4.5 Fig.5
December 1990
6
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