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74HCT245 Scheda tecnica(PDF) 11 Page - NXP Semiconductors

Il numero della parte 74HCT245
Spiegazioni elettronici  Octal bus transceiver; 3-state
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Produttore elettronici  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74HCT245 Scheda tecnica(HTML) 11 Page - NXP Semiconductors

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9397 750 14502
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 03 — 31 January 2005
11 of 22
Philips Semiconductors
74HC245; 74HCT245
Octal bus tranceiver; 3-state
[1]
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;
∑ (CL × VCC2 × fo) = sum of outputs.
tPZH, tPZL
3-state output enable time OE to
An or OE to Bn
see Figure 6
VCC = 2.0 V
-
-
190
ns
VCC = 4.5 V
-
-
38
ns
VCC = 6.0 V
-
-
33
ns
tPHZ, tPLZ
3-state output disable time OE to
An or OE to Bn
see Figure 6
VCC = 2.0 V
-
-
190
ns
VCC = 4.5 V
-
-
38
ns
VCC = 6.0 V
-
-
33
ns
tTHL, tTLH
output transition time
see Figure 5
VCC = 2.0 V
-
-
75
ns
VCC = 4.5 V
-
-
15
ns
VCC = 6.0 V
-
-
13
ns
Tamb = −40 °C to +125 °C
tPHL, tPLH
propagation delay An to Bn or Bn
to An
see Figure 5
VCC = 2.0 V
-
-
135
ns
VCC = 4.5 V
-
-
27
ns
VCC = 6.0 V
-
-
23
ns
tPZH, tPZL
3-state output enable time OE to
An or OE to Bn
see Figure 6
VCC = 2.0 V
-
-
225
ns
VCC = 4.5 V
-
-
45
ns
VCC = 6.0 V
-
-
38
ns
tPHZ, tPLZ
3-state output disable time OE to
An or OE to Bn
see Figure 6
VCC = 2.0 V
-
-
225
ns
VCC = 4.5 V
-
-
45
ns
VCC = 6.0 V
-
-
38
ns
tTHL, tTLH
output transition time
see Figure 5
VCC = 2.0 V
-
-
90
ns
VCC = 4.5 V
-
-
18
ns
VCC = 6.0 V
-
-
15
ns
Table 9:
Dynamic characteristics type 74HC245 …continued
GND = 0 V; test circuit see Figure 7.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit


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