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74LVC244ADB Fiches technique(PDF) 8 Page - NXP Semiconductors

No de pièce 74LVC244ADB
Description  Octal buffer/line driver; 3-state
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Fabricant  NXP [NXP Semiconductors]
Site Internet  http://www.nxp.com
Logo NXP - NXP Semiconductors

74LVC244ADB Fiches technique(HTML) 8 Page - NXP Semiconductors

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74LVC_LVCH244A_6
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 06 — 13 August 2009
8 of 18
NXP Semiconductors
74LVC244A; 74LVCH244A
Octal buffer/line driver; 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]
-10-
-
-
pF
Table 7.
Dynamic characteristics …continued
Voltages are referenced to GND (ground = 0 V). For test circuit see Figure 8.
Symbol Parameter
Conditions
−40 °C to +85 °C
−40 °C to +125 °C Unit
Min
Typ[2]
Max
Min
Max
Measurement points are given in Table 8.
Logic levels: VOL and VOH are typical output voltage levels that occur with the output load.
Fig 6.
The input (nAn) to output (nYn) propagation delays
mna171
nAn input
nYn output
tPLH
tPHL
GND
VI
VM
VM
VM
VM
VOH
VOL


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