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| 74HC_HCT157_15 Datasheet, PDF (8/19 Pages) NXP Semiconductors – Quad 2-input multiplexer | |||
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NXP Semiconductors
74HC157; 74HCT157
Quad 2-input multiplexer
Table 7. Dynamic characteristics â¦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 ï°C
Tamb = ï40 ï°C
to +85 ï°C
Tamb = ï40 ï°C
to +125 ï°C
Min Typ Max Min Max Min Max
tt
transition nY; see Figure 7
time
VCC = 4.5 V
[2]
-
7 15
-
19
-
22
CPD
power
CL = 50 pF; f = 1 MHz;
[3] -
70 -
-
-
-
-
dissipation VI = GND to VCC ï 1.5 V
capacitance
Unit
ns
pF
[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 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.
11. Waveforms
9,
LQSXW
6Q,Q,
*1'
92+
RXWSXW
Q<
92/
90
W3+/
90
W 7+/
90
90
W 3/+
W 7/+
DDG
Fig 7.
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Propagation delay input (nI0, nI1, S) to output (nYn)
74HC_HCT157
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 7 â 21 January 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
8 of 19
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