SN74HCS05: Questions of Input capacitance / Power dissipation capacitance

Motoyasu Hattori

Genius 9515 points

Part Number: SN74HCS05
Other Parts Discussed in Thread: SN74LV05A

Hi,

My customer has two questions. Could you please support us?

Could you please let us know the typical value of Input capacitance on SN74HCS05PWR?
According to the HCS05 datasheet, we can find the Cpd typ.[10pF] under no load test condition. However, SN74LV05A datasheet said Cpd on both VCC=3.3V case and VCC=5V case under "CL=50pF, F=10MHz test condition". Can TI provide Cpd of HCS05 under LV05A test condition? Please advise us.

Thanks and best regards,
M.HATTORI.

over 2 years ago

0 Clemens Ladisch over 2 years ago

Guru 276480 points

Section 6.5 of the datasheet specifies C_I as 5 pF max.

The HCS and LV-A test conditions are essentially the same. C_L is not included in the C_pd calculation. (Otherwise, C_pd would be at least as large as C_L.)

0 Owen Westfall over 2 years ago

TI__Expert 7701 points

Hi Motoyasu,

If you have any more questions in how C_pdis calculated please see CMOS Power Consumption and Cpd Calculation

Regards,

Owen

Logic

Logic forum

SN74HCS05: Questions of Input capacitance / Power dissipation capacitance