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| 74HC_HCT257_15 Datasheet, PDF (8/18 Pages) NXP Semiconductors – Quad 2-input multiplexer; 3-state | |||
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NXP Semiconductors
74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
Table 7. Dynamic characteristics â¦continued
Voltages are referenced to GND (ground = 0 V); For test circuit see Figure 8.
Symbol Parameter
Conditions
25 ï°C
tt
transition time
CPD
power dissipation
capacitance
74HCT257
tpd
propagation delay
ten
enable time
tdis
disable time
tt
transition time
CPD
power dissipation
capacitance
see Figure 6
VCC = 2.0 V
VCC = 4.5 V
VCC = 6.0 V
per multiplexer;
VI = GND to VCC
nl0 to nY or nl1 to nY;
see Figure 6
VCC = 4.5 V
VCC = 5.0 V; CL = 15 pF
S to nY; see Figure 6
VCC = 4.5 V
VCC = 5.0 V; CL = 15 pF
OE to nY; VCC = 4.5 V;
see Figure 7
OE to nY; VCC = 4.5 V;
see Figure 7
VCC = 4.5 V; see Figure 6
per multiplexer;
VI = GND to VCC ï 1.5 V
[1] tpd is the same as tPHL, tPLH.
[2] ten is the same as tPZH, tPZL.
[3] tdis is the same as tPHZ, tPLZ.
[4] tt is the same as tTHL, tTLH.
[5] CPD is used to determine the dynamic power dissipation (PD in ïW).
PD = CPD ï´ VCC2 ï´ fi ï´ N + ï¥(CL ï´ VCC2 ï´ 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;
ï¥(CL ï´ VCC2 ï´ fo) = sum of outputs.
Typ
[4]
14
5
4
[5] 45
Max
60
12
10
-
[1]
16
30
13
-
20
35
17
-
[2] 15
30
[3] 16
30
[4]
5
12
[5] 45
-
ï40 ï°C to
+85 ï°C
Max
ï40 ï°C to Unit
+125 ï°C
Max
75
90 ns
15
18 ns
13
15 ns
pF
38
45 ns
-
ns
44
53 ns
ns
38
45 ns
38
45 ns
15
18 ns
pF
74HC_HCT257
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 6 â 26 January 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
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