CY74FCT16244T: LED indication interface.

seema joshi12

Part Number: CY74FCT16244T
Other Parts Discussed in Thread: 74ACT16244

Sir,

In one of the LED indication interface we are testing CY74FCT16244T for driving LED on the pannel @I=8mA.

Existing design latch can not driver the required current@5V that is why we have modified it with adding buffer CY74FCT16244T.

But It is observed that buffer CY74FCT16244T is not able to switch output above 4V output @5V input with no load at output.

Let us know any other option to replace CY74FCT16244T ,which can provide output 5V@8mA with <5V input .

Regards

Seema Joshi

over 6 years ago

0 Clemens Ladisch over 6 years ago

Guru 317090 points

The CY74FCT16244T has TTL-compatible outputs, so the high output voltage will never reach 5 V. It would be a better idea to switch the LEDs to ground.

There a devices with TTL-compatible inputs and CMOS outputs, e.g., 74ACT16244.

0 seema joshi12 over 6 years ago in reply to Clemens Ladisch

Prodigy 40 points

Thanks!
i have other functionality on LED which demands for making LED common cathod.
Shall check the 74ACT16244 option ,additional pull up is required.

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CY74FCT16244T: LED indication interface.