74HC157_10 Datasheet, PDF(8/18 Page) NXP Semiconductors

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74HC157_10 Datasheet, PDF (8/18 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 Unit

to +125 ï°C

Min Typ Max Min Max

Min

Max

transition nY; see Figure 7

time

VCC = 4.5 V

[2]

7 15

22 ns

CPD

power

CL = 50 pF; f = 1 MHz;

[3] -

70 -

dissipation VI = GND to VCC

capacitance

[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

nI0, nI1, S

input

GND

nY output

VOH

VOL

t PHL

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)

t PLH

mna486

74HC_HCT157

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 3 â 31 December 2010

8 of 18

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