Datasheet

74HC_HCT7540 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 4 — 31 December 2012 7 of 16
NXP Semiconductors
74HC7540; 74HCT7540
Octal Schmitt trigger buffer/line driver; 3-state; inverting
11. Waveforms
Measurement points are given in Table 8.
V
OL
and V
OH
are typical voltage output levels that occur with the output load.
Fig 5. Input to output propagation delays
DDD


<Q
RXWSXW
$Q
LQSXW
9
,
*1'
9
2+
9
2/
W
7+/
W
7/+
W
3/+
9
0
9
0
9
0
9
0
W
3+/
Measurement points are given in Table 8.
V
OL
and V
OH
are typical voltage output levels that occur with the output load.
Fig 6. 3-state enable and disable times
DDD
*1'
9
&&
9
2/
RXWSXWV
HQDEOHG
9
,
*1'
9
0
W
3/=
9
;
9
<
9
2+
<QRXWSXW
/2:
WR2))
2))WR/2:
<QRXWSXW
+,*+WR2))
2))WR+,*+
2
(QLQSXW
W
3+=
RXWSXWV
HQDEOHG
RXWSXWV
GLVDEOHG
9
0
W
3=+
9
0
W
3=/
Table 8. Measurement points
Type Input Output
V
M
V
M
V
X
V
Y
74HC7540 0.5V
CC
0.5V
CC
0.1V
CC
0.9V
CC
74HCT75401.3V1.3V0.1V
CC
0.9V
CC