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74LVCH245A データシート(PDF) 7 Page - NXP Semiconductors

部品番号 74LVCH245A
部品情報  Octal bus transceiver; 3-state
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メーカー  NXP [NXP Semiconductors]
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74LVCH245A データシート(HTML) 7 Page - NXP Semiconductors

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74LVC_LVCH245A_5
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 05 — 25 August 2009
7 of 17
NXP Semiconductors
74LVC245A; 74LVCH245A
Octal bus transceiver; 3-state
[1]
tpd is the same as tPLH and tPHL.
ten is the same as tPZL and tPZH.
tdis is the same as tPLZ and tPHZ.
[2]
Typical values are measured at Tamb =25 °C.
[3]
Typical values are measured at Tamb =25 °C and VCC = 3.3 V.
[4]
Skew between any two outputs of the same package switching in the same direction. This parameter is guaranteed by design.
[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 Volts
N = number of inputs switching
Σ(C
L × VCC
2
× f
o) = sum of the outputs.
11. AC waveforms
CPD
power
dissipation
capacitance
per buffer; VI = GND to VCC;VCC = 3.3 V [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
−40 °C to +85 °C
−40 °C to +125 °C Unit
Min
Typ[2]
Max
Min
Max
See Table 8 for measurement points
VOL and VOH are typical output voltage levels that occur with the output load.
Fig 5.
Input (An, Bn) to output (Bn, An) propagation delays and output transition times
mna176
An, Bn input
Bn, An output
tPLH
tPHL
GND
VI
VM
VM
VM
VM
VOH
VOL


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