74AHC257 Просмотр технического описания (PDF) - NXP Semiconductors.

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74AHC257

Quad 2-input multiplexer; 3-state

NXP Semiconductors. 

Nexperia

74AHC257; 74AHCT257

Quad 2-input multiplexer; 3-state

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

74AHCT257; VCC = 4.5 V to 5.5 V

tpd

propagation nI0, nI1 to nY; see Figure 6 [2]

delay

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

fi = 1 MHz; VI = GND to VCC [5]

dissipation

capacitance

4 outputs switching via

input S

- 51 -

-

-

-

-

pF

1 output switching via

input I

- 15 -

-

-

-

-

pF

[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(CL × VCC2 × fo) = sum of the outputs.

74AHC_AHCT257_2

Product data sheet

Rev. 02 — 9 May 2008

© Nexperia B.V. 2017. All rights reserved

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