74AHC257 查看數據表（PDF） - Philips Electronics

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74AHC257

Quad 2-input multiplexer; 3-state

Philips Electronics 

Philips Semiconductors

Quad 2-input multiplexer; 3-state

Product specification

74AHC257;

74AHCT257

AC CHARACTERISTICS

Type 74AHC257

GND = 0 V; tr = tf ≤ 3.0 ns.

SYMBOL

PARAMETER

TEST CONDITIONS

WAVEFORMS CL

MIN.

25

TYP.

Tamb (°C)

−40 to +85

−40 to +125 UNIT

MAX. MIN. MAX. MIN. MAX.

VCC = 3.0 to 3.6 V; note 1

tPHL/tPLH

propagation delay

nI0 to nY; nI1 to nY

propagation delay

S to nY

see Figs 6

and 8

tPZH/tPZL 3-state output enable see Figs 7

time OE to nY

and 8

tPHZ/tPLZ 3-state output disable

time OE to nY

tPHL/tPLH

propagation delay

nI0 to nY; nI1 to nY

propagation delay

S to nY

see Figs 6

and 8

tPZH/tPZL 3-state output enable see Figs 7

time OE to nY

and 8

tPHZ/tPLZ 3-state output disable

time OE to nY

15 pF −

−

−

−

50 pF −

−

−

−

4.2 9.3 1.0 11.0 1.0 12.0 ns

5.2 11.0 1.0 13.0 1.0 14.0 ns

4.5 10.5 1.0 12.5 1.0 13.5 ns

5.1 9.5 1.0 11.0 1.0 11.5 ns

6.0 12.8 1.0 14.5 1.0 16.0 ns

7.4 14.5 1.0 16.5 1.0 18.5 ns

6.4 14.0 1.0 16.0 1.0 17.5 ns

7.2 12.0 1.0 13.5 1.0 14.5 ns

VCC = 4.5 to 5.5 V; note 2

tPHL/tPLH

propagation delay

nI0 to nY; nI1 to nY

propagation delay

S to nY

see Figs 6

and 8

tPZH/tPZL 3-state output enable see Figs 7

time OE to nY

and 8

tPHZ/tPLZ 3-state output disable

time OE to nY

tPHL/tPLH

propagation delay

nI0 to nY; nI1 to nY

propagation delay

S to nY

see Figs 6

and 8

tPZH/tPZL 3-state output enable see Figs 7

time OE to nY

and 8

tPHZ/tPLZ 3-state output disable

time OE to nY

15 pF −

−

−

−

50 pF −

−

−

−

2.9 5.9 1.0 7.0 1.0 7.5 ns

3.5 6.8 1.0 8.0 1.0 8.5 ns

3.2 6.8 1.0 8.0 1.0 8.5 ns

3.4 6.5 1.0 7.0 1.0 8.5 ns

4.2 7.9 1.0 9.0 1.0 11.5 ns

5.0 8.8 1.0 10.0 1.0 12.5 ns

4.5 8.8 1.0 10.0 1.0 12.5 ns

4.9 7.9 1.0 9.0 1.0 9.5 ns

Notes

1. Typical values at VCC = 3.3 V.

2. Typical values at VCC = 5.0 V.

2000 Apr 03

9

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