6

Rev:A Date: 1/27/04

SP320 Complete +5V-Only V.35 Interface with RS-232 (V.28) Control Lines

© Copyright 2004 Sipex Corporation

Figure 2. Charge Pump Phase 1

Figure 3. Charge Pump Phase 2

+10V

+

+

++

–

–

–

–

–5V

–5V

+5V

+

+

++

–

–

–

–

Figure 4. Charge Pump Phase 3

Figure 5. Charge Pump Phase 4

–10V

+

+

++

–

–

–

–

–5V

+5V

–5V

+

+

++

–

–

–

–

Figure 6. A Competitor’s Typical V.35 Solution Using Six Components.

1µF

1µF

1µF1µF

DX

T

P

S

TXD (103)

RX

T

P

S

DX

T

U

W

SCTE (113)

RX

T

U

W

T

AA

Y

TXC (114)

DX

T

Y

T

X

V

RXC (115)

T

X

V

RX

T

T

R

TXD (104)

T

T

R

RX

RX

DX

DX

AA

T

=

50Ω

50Ω 125Ω

1µF

1µF

V

CC2

B

A

GND (102)

CABLE SHIELD

B

A

V

CC1

1µF

1µF

DX

DX

RX

RX

RX

RX

DX

DX

1µF1µF

1µF

1µF

RX

RX

DX

DX

DX

DX

RX

RX

1µF1µF

ISO 2593

34-PIN DTE/DCE

INTERFACE

CONNECTOR

ISO 2593

34-PIN DTE/DCE

INTERFACE

CONNECTOR

V.35

V.35

RS-232

RS-232

H

DTR (108)

H

C

RTS (105)

C

E

DSR (107)

E

D

CTS (106)

D

F

DCD (109)

F

NN

TM (142)

N

RDL (140)

N

L

LLB (141)

L

NN

V

CC1

5V

V

CC2

5V