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74HCT157D Arkusz danych(PDF) 8 Page - NXP Semiconductors

Numer części 74HCT157D
Szczegółowy opis  Quad 2-input multiplexer
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Logo NXP - NXP Semiconductors

74HCT157D Arkusz danych(HTML) 8 Page - NXP Semiconductors

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74HC_HCT157
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 3 — 31 December 2010
8 of 18
NXP Semiconductors
74HC157; 74HCT157
Quad 2-input multiplexer
[1]
tpd is the same as tPLH and tPHL.
[2]
tt is the same as tTHL and tTLH.
[3]
CPD is used to determine the dynamic power dissipation (PD in W).
PD =CPD  VCC2  fi  N+ (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;
(C
L  VCC
2
 f
o) = sum of outputs.
11. Waveforms
tt
transition
time
nY; see Figure 7
[2]
VCC = 4.5 V
-
7
15
-
19
-
22
ns
CPD
power
dissipation
capacitance
CL =50pF;f= 1 MHz;
VI =GND to VCC
[3]
-70
-
-
-
-
-
pF
Table 7.
Dynamic characteristics …continued
Voltages are referenced to GND (ground = 0 V); CL = 50 pF unless otherwise specified; for test circuit see Figure 9.
Symbol Parameter
Conditions
Tamb = 25 C
Tamb = 40 C
to +85
C
Tamb = 40 C
to +125
C
Unit
Min
Typ
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 7.
Propagation delay input (nI0, nI1, S) to output (nYn)
mna486
tPHL
tPLH
VM
VM
nI0, nI1, S
input
nY output
GND
VI
VOH
VOL


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