74HC258D datasheet(6/14 Pages) NXP

6 / 14 page

74HC258_4

Product data sheet

Rev. 04 — 14 April 2008

6 of 14

NXP Semiconductors

74HC258

Quad 2-input multiplexer; 3-state; inverting

10. Dynamic characteristics

[1]

tpd is the same as tPHL and tPLH.

[2]

ten is the same as tPZH and tPZL.

[3]

tdis is the same as tPHZ and tPLZ.

[4]

tt is the same as tTHL and tTLH.

[5]

CPD is used to determine the dynamic power dissipation (PD in µW).

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;

∑(CL × VCC2 × fo) = sum of outputs.

Table 7.

Dynamic characteristics

GND = 0 V; for test circuit see Figure 8.

Symbol

Parameter

Conditions

°C

−40 °C to +125 °C Unit

Min

Typ

Max

(85

°C)

Max

(125

°C)

tpd

propagation delay

nl0, nI1to nY; see Figure 6

[1]

VCC = 2.0 V

120

145

VCC = 4.5 V

VCC = 6.0 V

VCC = 5.0 V; CL = 15 pF

S to nY; see Figure 6

VCC = 2.0 V

140

175

210

VCC = 4.5 V

VCC = 6.0 V

VCC = 5.0 V; CL = 15 pF

ten

enable time

OE to nY; see Figure 7

[2]

VCC = 2.0 V

140

175

210

VCC = 4.5 V

VCC = 6.0 V

tdis

disable time

OE to nY; see Figure 7

[3]

VCC = 2.0 V

150

190

225

VCC = 4.5 V

VCC = 6.0 V

transition time

see Figure 6

[4]

VCC = 2.0 V

VCC = 4.5 V

VCC = 6.0 V

CPD

power dissipation

capacitance

per multiplexer;

VI = GND to VCC

[5]

-55-

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