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74AHC257

Quad 2-input multiplexer; 3-state

NXP Semiconductors. 

Nexperia

74AHC257; 74AHCT257

Quad 2-input multiplexer; 3-state

10. Dynamic characteristics

Table 7. Dynamic characteristics

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

74AHC257

tpd

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

delay

VCC = 3.0 V to 3.6 V

CL = 15 pF

- 4.2 9.3 1.0 11.0

1.0

12.0 ns

CL = 50 pF

- 6.0 12.8 1.0 14.5

1.0

16.0 ns

VCC = 4.5 V to 5.5 V

CL = 15 pF

- 2.9 5.9 1.0

7.0

1.0

7.5 ns

CL = 50 pF

- 4.2 7.9 1.0

9.0

1.0

11.5 ns

S to nY; see Figure 6

[2]

VCC = 3.0 V to 3.6 V

CL = 15 pF

- 5.2 11.0 1.0 13.0

1.0

14.0 ns

CL = 50 pF

- 7.4 14.5 1.0 16.5

1.0

18.5 ns

VCC = 4.5 V to 5.5 V

CL = 15 pF

- 3.5 6.8 1.0

8.0

1.0

8.5 ns

CL = 50 pF

- 5.0 8.8 1.0 10.0

1.0

12.5 ns

ten

enable time OE to nY; see Figure 7

[3]

VCC = 3.0 V to 3.6 V

CL = 15 pF

- 4.5 10.5 1.0 12.5

1.0

13.5 ns

CL = 50 pF

- 6.4 14.0 1.0 16.0

1.0

17.5 ns

VCC = 4.5 V to 5.5 V

CL = 15 pF

- 3.2 6.8 1.0

8.0

1.0

8.5 ns

CL = 50 pF

- 4.5 8.8 1.0 10.0

1.0

12.5 ns

tdis

disable time OE to nY; see Figure 7

[4]

VCC = 3.0 V to 3.6 V

CL = 15 pF

- 5.1 9.5 1.0 11.0

1.0

11.5 ns

CL = 50 pF

- 7.2 12.0 1.0 13.5

1.0

14.5 ns

VCC = 4.5 V to 5.5 V

CL = 15 pF

- 3.4 6.5 1.0

7.0

1.0

8.5 ns

CL = 50 pF

- 4.9 7.9 1.0

9.0

1.0

9.5 ns

CPD

power

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

dissipation

capacitance

4 outputs switching via

input S

- 45 -

-

-

-

-

pF

1 output switching via

input I

- 15 -

-

-

-

-

pF

74AHC_AHCT257_2

Product data sheet

Rev. 02 — 9 May 2008

© Nexperia B.V. 2017. All rights reserved

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