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© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet

Rev. 03 — 12 November 2004

12 of 19

Philips Semiconductors

74HC237

3-to-8 line decoder, demultiplexer with address latches

12. Waveforms

Fig 6.

Waveforms showing the address input (An) and enable inputs (E2, LE) to output

(Yn) propagation delays and the output transition times

Fig 7.

Waveforms showing the enable input (E1) to output (Yn) propagation delays and

the output transition times

The shaded areas indicate when the input is permitted to change for predictable output

performance.

Fig 8.

Waveforms showing the data set-up, hold times for An input to LE input and the

latch enable pulse width

001aab873

An, E2, LE

input

Yn output

001aab874

E1 input

Yn output

LE input

001aab875

An input

transparant

transparant

latched

latched