74F269_5

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Product data sheet

Rev. 05 — 25 March 2010

12 of 19

NXP Semiconductors

74F269

8-bit bidirectional binary counter

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

Measurement points are given in Table 8.

Fig 11. Count enable inputs (CEP and CET) and clock input (CP) set-up and hold times

001aal302

GND

GND

CP

Qn

COUNT

NO CHANGE

CET, CEP

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

Measurement points are given in Table 8.

Fig 12. Up/down count control input (U/D) and clock input (CP) set-up and hold times

001aal303

U/D

CP

GND

GND

Qn

COUNT DOWN

COUNT UP