HEF4093BDF データシートの表示（PDF） - Philips Electronics

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HEF4093BDF

Quadruple 2-input NAND Schmitt trigger

Philips Electronics 

Philips Semiconductors

Quadruple 2-input NAND Schmitt trigger

Product specification

HEF4093B

gates

Fig.9 Typical switching levels as a function of supply voltage VDD; Tamb = 25 °C.

APPLICATION INFORMATION

Some examples of applications for the HEF4093B are:

• Wave and pulse shapers

• Astable multivibrators

• Monostable multivibrators.

Fig.10 The HEF4093B used as a astable multivibrator.

Fig.11 Schmitt trigger driven via a high impedance

(R > 1 kΩ).

If a Schmitt trigger is driven via a high impedance (R > 1 kΩ) then it is necessary to incorporate a capacitor C of such

value that:

-C-C---p- > V-----D---D---V--–--H---V----S---S-- , otherwise oscillation can occur on the edges of a pulse.

Cp is the external parasitic capacitance between inputs and output; the value depends on the circuit board layout.

Note

The two inputs may be connected together, but this will result in a larger through-current at the moment of switching.

January 1995

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