SN74HC148: VIL supply voltage and temperature dependence

Conor

Part Number: SN74HC148

Hi,

In the characteristic table described in "6.2 Recommended Operating Conditions" in the data sheet, the maximum value of VIL (Low-level input voltage) is specified for 2V, 4.5V, and 6V respectively.

(1) Could you tell us the maximum value of VIL when Vcc = 3V, 3.3V and 5V?

(2) Is it correct to assume that the maximum value of VIL increases linearly in proportion to Vcc when Vcc is in the range of 2 to 6V?

(3) Does the maximum value of VIL have temperature dependency? If Vcc is constant, will it be the same value within the operating temperature range (-40°C to 85°C)?

Thanks,

Conor

over 2 years ago

0 Clemens Ladisch over 2 years ago

Guru 318700 points

See [FAQ] What method is best used for estimating specification values between those given in the datasheet?

The min/max values are over temperature (unless stated otherwise).

0 Conor over 2 years ago in reply to Clemens Ladisch

Guru 12805 points

Hi Clemens,

Clemens Ladisch said:
The min/max values are over temperature (unless stated otherwise).

Am I correct in understanding that VIL is temperature dependent?Also, are the VIL Min/Max values listed in the DS for SN74HC148 within the range of -40°C to 85°C?

Thanks,

Conor

+1 Clemens Ladisch over 2 years ago in reply to Conor

Guru 318700 points

In a CMOS input, the temperature-dependent threshold voltages of the two transistors are likely to cancel out each other. Anyway, this is not specified and probably has not been measured.

The min/max guarantees are for the recommeded operating conditions.

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SN74HC148: VIL supply voltage and temperature dependence