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74HC259BQ Datasheet(PDF) 10 Page - NXP Semiconductors

No. de pieza 74HC259BQ
Descripción Electrónicos  8-bit addressable latch
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74HC259BQ Datasheet(HTML) 10 Page - NXP Semiconductors

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74HC_HCT259_4
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 04 — 25 February 2009
10 of 21
NXP Semiconductors
74HC259; 74HCT259
8-bit addressable latch
[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]
tt is the same as tTHL and tTLH.
[4]
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.
11. Waveforms
th
hold time
D to LE; see Figure 10
and Figure 11
VCC = 4.5 V
0
−8-
0
-
0
-
ns
An to LE; see Figure 10
and Figure 11
VCC = 4.5 V
0
−4-
0
-
0
-
ns
CPD
power
dissipation
capacitance
fi = 1 MHz;
VI = GND to VCC − 1.5 V
[4]
-19
-
-
-
-
-
pF
Table 8.
Dynamic characteristics …continued
Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 12.
Symbol Parameter
Conditions
25
°C
−40 °Cto+85 °C −40 °C to +125 °C Unit
Min
Typ[1] Max
Min
Max
Min
Max
Measurement points are given in Table 9.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig 6.
Data input to output propagation delays
001aah123
D input
Qn output
tPHL
tPLH
GND
VCC
VM
VM
VOH
VOL


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