74HC_HCT253_3

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Product data sheet

Rev. 03 — 22 April 2010

9 of 17

NXP Semiconductors

74HC253; 74HCT253

Dual 4-input multiplexer; 3-state

12. Waveforms

Measurement points are given in Table 8.

Fig 6.

Propagation delays input (Sn, 1In, 2In) to output (nY) and output (nY) transition times

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Sn, 1In, 2ln input

GND

nY output

10 %

90 %

Measurement points are given in Table 8.

Fig 7.

3-state output enable and disable times

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outputs

disabled

outputs

enabled

outputs

enabled

output

LOW-to-OFF

OFF-to-LOW

output

HIGH-to-OFF

OFF-to-HIGH

nOE input

GND

GND

90 %

90 %

10 %

10 %

Table 8.

Measurement points

Type

Input

Output

74HC253

74HCT253

1.3 V

1.3 V