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74AHCT257D Datenblatt(PDF) 9 Page - NXP Semiconductors

Teilenummer 74AHCT257D
Bauteilbeschribung  Quad 2-input multiplexer 3-state
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74AHCT257D Datenblatt(HTML) 9 Page - NXP Semiconductors

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74AHC_AHCT257_2
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 9 May 2008
9 of 16
NXP Semiconductors
74AHC257; 74AHCT257
Quad 2-input multiplexer; 3-state
[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]
ten is the same as tPZL and tPZH.
[4]
tdis is the same as tPLZ and tPHZ.
[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 V;
N = number of inputs switching;
Σ(C
L × VCC
2
× f
o) = sum of the outputs.
74AHCT257; VCC = 4.5 V to 5.5 V
tpd
propagation
delay
nI0, nI1 to nY; see Figure 6
[2]
CL = 15 pF
-
3.7
6.5
1.0
8.0
1.0
9.0
ns
CL = 50 pF
-
4.9
8.5
1.0
10.0
1.0
11.0
ns
S to nY; see Figure 6
[2]
CL = 15 pF
-
5.1
9.0
1.0
10.5
1.0
11.5
ns
CL = 50 pF
-
6.4
10.5
1.0
12.5
1.0
13.5
ns
ten
enable time
OE to nY; see Figure 7
[3]
CL = 15 pF
-
3.9
8.0
1.0
9.0
1.0
10.0
ns
CL = 50 pF
-
5.1
10.0
1.0
11.0
1.0
12.0
ns
tdis
disable time
OE to nY; see Figure 7
[4]
CL = 15 pF
-
4.5
7.5
1.0
8.0
1.0
8.5
ns
CL = 50 pF
-
6.5
9.5
1.0
10.5
1.0
11.5
ns
CPD
power
dissipation
capacitance
fi = 1 MHz; VI = GND to VCC
[5]
4 outputs switching via
input S
-51
-
-
-
-
-
pF
1 output switching via
input I
-15
-
-
-
-
-
pF
Table 7.
Dynamic characteristics …continued
Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 8.
Symbol Parameter
Conditions
25
°C
−40 °C to +85 °C −40 °C to +125 °C Unit
Min
Typ[1] Max
Min
Max
Min
Max


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