SP3221E(2014) 데이터 시트보기 (PDF) - Exar Corporation

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SP3221E
(Rev.:2014)

Intelligent +3.0V to +5.5V RS-232 Transceiver

Exar Corporation 

VCC = +5V

+

C1 –

–5V

+5V

+

C2 –

–5V

C4

+ – VDD Storage Capacitor

– + VSS Storage Capacitor

C3

Figure 8. Charge Pump - Phase 1

VCC = +5V

+

C1 –

Figure 9. Charge Pump - Phase 2

a) C2+

1

2

2

+

C2 –

–10V

C4

+ – VDD Storage Capacitor

– + VSS Storage Capacitor

C3

[

T

]

+6V

T

0V

0V

b) C2-

T

-6V

Ch1 2.00V Ch2 2.00V M 1.00ms Ch1 1.96V

Figure 10. Charge Pump Waveforms

VCC = +5V

+

C1 –

–5V

+5V

+

C2 –

–5V

C4

+ – VDD Storage Capacitor

– + VSS Storage Capacitor

C3

Figure 11. Charge Pump - Phase 3

VCC = +5V

+10V

+

C1 –

+

C2 –

C4

+ – VDD Storage Capacitor

– + VSS Storage Capacitor

C3

Figure 12. Charge Pump - Phase 4

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • www.exar.com

11

SP3221E_102_091014

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