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74HCT240 Arkusz danych(PDF) 8 Page - NXP Semiconductors

Numer części 74HCT240
Szczegółowy opis  Octal buffer/line driver; 3-state; inverting
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Strona internetowa  http://www.nxp.com
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74HCT240 Arkusz danych(HTML) 8 Page - NXP Semiconductors

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74HC_HCT240_3
© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 03 — 2 August 2007
8 of 18
NXP Semiconductors
74HC240; 74HCT240
Octal buffer/line driver; 3-state; inverting
[1]
tpd is the same as tPHL and tPLH.
[2]
ten is the same as tPZH and tPZL.
[3]
tdis is the same as tPHZ and tPLZ.
[4]
tt is the same as tTHL and tTLH.
[5]
CPD is used to determine the dynamic power dissipation (PD in µW):
PD =CPD × VCC2 × fi × N+ ∑ (CL × VCC2 × fo) where:
fi = input frequency in MHz;
fo = output frequency in MHz;
CL = output load capacitance in pF;
VCC = supply voltage in V;
N = number of inputs switching;
∑ (C
L × VCC
2
× f
o) = sum of outputs.
11. Waveforms
74HCT240
tpd
propagation delay
nAn to nYn;
see Figure 6
[1]
VCC = 4.5 V
-
11
20
25
30
ns
VCC = 5.0 V; CL =15pF
-
9
-
-
-
ns
ten
enable time
nOE to nYn; VCC = 4.5 V; see
Figure 7
[2]
-13
3038
45
ns
tdis
disable time
nOE to nYn; VCC = 4.5 V; see
Figure 7
[3]
-13
2531
38
ns
tt
transition time
VCC = 4.5 V; see Figure 6
[4]
-
5
12
15
18
ns
CPD
power dissipation
capacitance
per transceiver;
VI = GND to VCC − 1.5 V
[5]
-30-
-
-
pF
Table 7.
Dynamic characteristics …continued
GND = 0 V; for load circuit see Figure 8.
Symbol Parameter
Conditions
25
°C
−40 °C to +125 °C Unit
Min
Typ
Max
Max
(85
°C)
Max
(125
°C)
Measurement points are given in Table 8.
VOL and VOH are typical voltage output drop that occur with the output load.
Fig 6.
Input (nAn) to output (nYn) propagation delays and output transition times
mgu781
nAn input
nYn output
tPHL
tPLH
GND
VI
VM
VM
VM
VM
VOH
VOL


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