74LVCU04A datasheet(6/10 Pages) PHILIPS

6 page

Philips Semiconductors

Product specification

74LVCU04A

Hex inverter

1998 Jul 29

APPLICATION INFORMATION

Some applications for the 74LVU04 are:

• Linear amplifier (see Figure 4)

• In crystal oscillator designs (see Figure 5)

• Astable multivibrator (see Figure 6)

SV00404

GND

U04

Note:

ZL > 10kΩ; AOL = 20 (typical)

Au + –

)

) A

)

OMax(P

*P)

VCC – 1.5 V centered

at 1/2 VCC

≈

3 k

Ω < R1, R2 < 1 MΩ

Typical unity gain bandwidth product is 5 MHz.

Cl, see Figure10

AOL = open loop amplification

Au = voltage amplification

Figure 4. LVU04 used as a linear amplifier.

Note to Figure 4

ZL > 10 kW; AOL = 20 (typical)

+ –

)

) A

OL)

; VO Max (P – P)

≈ VCC – 1.5 V centered

at 1/2 VCC

3 k

W < R1, R2 < 1 MW

Typical unity gain bandwidth product is 50 MHz.

AOL = open loop amplification

Au = voltage amplification

SV00408

U04

out

Note:

C1 = 47 pF (typ.)

C2 = 22 pF (typ.)

R1 = 1 to 10 MW (typ.)

R2 optimum value depends on the frequency and required stability against

changes in VCC or average minimum ICC (ICC is typically

2 mA at VCC = 3 V and f = 1 MHz).

Figure 5. Crystal oscillator configuration.

Note to Figure 5

C1 = 47 pF (typ.)

C2 = 22 pF (typ.)

R1 = 1 to 10 MW (typ.)

R2 optimum value depends on the frequency and required stability

against changes in VCC or average minimum ICC.

SV00406

U04

Note:

[

2.2 RC

S [

2x R

The average ICC (mA) is approximately

3.5 + 0.05 x f (MHz) x C (pF) at VCC = 3.0 V.

Figure 6. LVCU04 used as an astable multivibrator.

Note to Figure 6

+ 1

[

2.2 RC

RS ≈ 2 x R

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