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74HCT7540 データシート(PDF) 5 Page - NXP Semiconductors

部品番号 74HCT7540
部品情報  Octal Schmitt trigger buffer/line driver; 3-state; inverting
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メーカー  PHILIPS [NXP Semiconductors]
ホームページ  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74HCT7540 データシート(HTML) 5 Page - NXP Semiconductors

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December 1990
5
Philips Semiconductors
Product specification
Octal Schmitt trigger buffer/line driver;
3-state; inverting
74HC/HCT7540
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see
“74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Transfer characteristics are given below (not applicable for OEn inputs).
Output capability: bus driver
ICC category: MSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; tr =tf = 6 ns; CL = 50 pF
TRANSFER CHARACTERISTICS FOR 74HC
Voltages are referred to GND (ground = 0 V)
SYMBOL PARAMETER
Tamb (°C)
UNIT
TEST CONDITIONS
74HC
VCC
(V)
WAVEFORMS
+25
−40 to +85
−40 to +125
min. typ.
max. min. max.
min.
max.
tPHL/ tPLH
propagation delay
An to Yn
39
14
11
120
24
20
150
30
26
180
36
31
ns
2.0
4.5
6.0
Fig.8
tPZH/ tPZL
3-state output enable
time
OEn to Yn
41
15
12
150
30
26
190
38
33
225
45
38
ns
2.0
4.5
6.0
Fig.9
tPHZ/ tPLZ
3-state output disable
time
OEn to Yn
52
19
15
150
30
26
190
38
33
225
45
38
ns
2.0
4.5
6.0
Fig.9
tTHL/ tTLH
output transition time
14
5
4
60
12
10
75
15
13
90
18
15
ns
2.0
4.5
6.0
Fig.8
SYMBOL PARAMETER
Tamb (°C)
UNIT
TEST CONDITIONS
74HC
VCC
(V)
WAVEFORMS
+25
−40 to +85
−40 to +125
min.
typ.
max.
min.
max.
min.
max.
VT+
positive-going threshold
1.50
3.15
4.20
1.50
3.15
4.20
1.50
3.15
4.20
V
2.0
4.5
6.0
Figs 6 and 7
VT−
negative-going threshold
0.30
1.35
1.80
0.30
1.35
1.80
0.30
1.35
1.80
V
2.0
4.5
6.0
Figs 6 and 7
VH
hysteresis (VT+ − VT−)
0.10
0.25
0.30
0.20
0.40
0.50
0.10
0.25
0.30
0.10
0.25
0.30
V
2.0
4.5
6.0
Figs 6 and 7


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