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74VHC_VHCT245 датащи(PDF) 8 Page - NXP Semiconductors

номер детали 74VHC_VHCT245
подробное описание детали  Octal bus transceiver; 3-state
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производитель  PHILIPS [NXP Semiconductors]
домашняя страница  http://www.nxp.com
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74VHC_VHCT245 датащи(HTML) 8 Page - NXP Semiconductors

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74VHC_VHCT245_1
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 01 — 25 August 2009
8 of 16
NXP Semiconductors
74VHC245; 74VHCT245
Octal bus transceiver; 3-state
[1]
Typical values are measured at nominal supply voltage (VCC = 3.3 V and VCC = 5.0 V).
[2]
tpd is the same as tPLH and tPHL.
[3]
ten is the same as tPZL and tPZH.
[4]
tdis is the same as tPLZ and tPHZ.
[5]
CPD is used to determine the dynamic power dissipation (PD in µW).
PD =CPD × VCC2 × fi × N+ Σ(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;
Σ(C
L × VCC
2
× f
o) = sum of the outputs.
10.1 Waveforms
tdis
disable time
OE to An; OE to Bn;
signal name DIR;
see Figure 6
[4]
CL = 15 pF
-
5.0
14.4
1.0
15.5
1.0
18.0
ns
CL = 50 pF
-
6.0
15.4
1.0
16.5
1.0
19.5
ns
CPD
power
dissipation
capacitance
fi = 1 MHz;
VI = GND to VCC
[5]
-15
-
-
-
-
-
pF
Table 7.
Dynamic characteristics …continued
Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 7.
Symbol Parameter
Conditions
25
°C
−40 °C to +85 °C −40 °C to +125 °C Unit
Min
Typ[1] Max
Min
Max
Min
Max
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig 5.
Input to output propagation delays
mna176
An, Bn input
Bn, An output
tPLH
tPHL
GND
VI
VM
VM
VM
VM
VOH
VOL


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