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74HC_HCT4851_2
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 2 September 2008
11 of 20
NXP Semiconductors
74HC4851; 74HCT4851
8-channel analog MUX/DEMUX with injection-current effect control
[1]
tpd is the same as tPLH and tPHL.
[2]
ten is the same as tPZH and tPZL.
[3]
tdis is the same as tPLZ and tPHZ.
[4]
CPD is used to determine the dynamic power dissipation (PD in µW):
PD =CPD × VCC2 × fi + ∑{(CL +Csw) × VCC2 × fo} where:
fi = input frequency in MHz;
fo = output frequency in MHz;
∑{(C
L +Csw) × VCC
2
× f
o} = sum of outputs;
CL = output load capacitance in pF;
Csw = switch capacitance in pF;
VCC = supply voltage in V.
12. Waveforms
74HCT4851
tpd
propagation delay
Z, Yn to Yn, Z;
see Figure 10
[1]
VCC = 4.5 V
1.6
3.7
11.5
1.1
12.5
1.1
13.5
ns
Sn to Z, Yn;
see Figure 11
[1]
VCC = 4.5 V
3.2
8.0
13
2.3
15
2.3
17
ns
ten
enable time
E to Z, Yn;
see Figure 12
[2]
VCC = 4.5 V
4.2
8.6
25
3.0
30
3.0
35
ns
tdis
disable time
EtoZ,Yn;
see Figure 12
[3]
VCC = 4.5 V
28.5
64.7
80
28.2
90
28
100
ns
CPD
power dissipation
capacitance
per channel;
see Figure 13
[4]
VCC = 5.0 V
-
30
-
-
-
-
-
pF
Table 9.
Dynamic characteristics …continued
At recommended operating conditions; voltages are referenced to GND (ground 0 V); for load circuit see Figure 14.
Symbol
Parameter
Conditions
25
°C
−40 °C to +85 °C −40 °C to +125 °C Unit
Min
Typ
Max
Min
Max
Min
Max
Fig 10. Input (Z, Yn) to output (Yn, Z) propagation delays
001aah574
VCC
Z or Yn
input
Yn or Z
output
tPLH
0.5VCC
0.5VCC
tPHL
GND
VCC
GND


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