HEF40240B Просмотр технического описания (PDF) - Philips Electronics

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HEF40240B

Octal inverting buffers with 3-state outputs

Philips Electronics 

Philips Semiconductors

Octal inverting buffers with 3-state outputs

Product specification

HEF40240B

buffers

(1) P-channel MOS transistor conducting.

(2) P-channel MOS transistor and bipolar

n-p-n transistor conducting.

Fig.4 Typical output source current characteristic.

Fig.5 Schematic diagram of output stage.

AC CHARACTERISTICS

VSS = 0 V; Tamb = 25 °C; input transition times ≤ 20 ns

ALL BUFFERS SWITCHING

VDD

V

Dynamic power

5

dissipation per

10

package (P)

15

TYPICAL FORMULA FOR P (µW)

4 250 fi + ∑ (foCL) × VDD2

17 000 fi + ∑ (foCL) × VDD2

46 000 fi + ∑ (foCL) × VDD2

where

fi = input freq. (MHz)

fo = output freq. (MHz)

CL = load capacitance (pF)

∑ (foCL) = sum of outputs

VDD = supply voltage (V)

January 1995

4

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