SP320 Datasheet, PDF (6/12 Pages) Sipex Corporation – Complete +5V-Only V.35 Interface with RS-232 V.28 Control Lines

V_CC = +5V
+
C_{1 –}
+10V
+
C_{2 –}
C₄
+ – _{VDD Storage Capacitor}
– + _{VSS Storage Capacitor}
C₃
Figure 2. Charge Pump Phase 1
V_CC = +5V
+
C_{1 –}
–5V
+5V
+
C_{2 –}
–5V
C₄
+ – _{VDD Storage Capacitor}
– + _{VSS Storage Capacitor}
C₃
Figure 3. Charge Pump Phase 2
V_CC = +5V
+
C_{1 –}
+
C_{2 –}
–10V
C₄
+ – _{VDD Storage Capacitor}
– + _{VSS Storage Capacitor}
C₃
V_CC = +5V
+
C_{1 –}
–5V
+5V
+
C_{2 –}
–5V
C₄
+ – _{VVDDDDStSotroargaegCeaCpacpiatocritor}
–+
C₃
V_SS Storage Capacitor
Figure 4. Charge Pump Phase 3
Figure 5. Charge Pump Phase 4
V_CC1
5V
1µF 1µF
1µF ^V.35
DX
DX
RX
RX
RX
1µF
T
T
T
T
T
50Ω _125Ω
T=
50Ω
P
TXD (103) _P
S
S
T
U SCTE (113) U
W
W
T
AA ^{TXC (114)} AA
Y
Y
T
X
RXC (115) X
V
V
T
T
TXD (104) T
R
R
T
1µF 1µF
V_CC2
5V
1µF
1µF
V.35
RX
RX
DX
DX
DX
V_CC1
1µF 1µF
B
GND (102) _B
A ^{CABLE SHIELD} A
V_CC2
1µF 1µF
1µF
1µF
RS-232
DX
DX
RX
RX
RX
RX
DX
DX
H
DTR (108) _H
C
RTS (105) _C
E
DSR (107) _E
D ^{CTS (106)}
D
F
DCD (109)
F
NN
TM (142)
NN
N
RDL (140) _N
L
LLB (141)
L
1µF
1µF
RS-232
RX
RX
DX
DX
DX
DX
RX
RX
ISO 2593
34-PIN DTE/DCE
INTERFACE
CONNECTOR
ISO 2593
34-PIN DTE/DCE
INTERFACE
CONNECTOR
Figure 6. A Competitor’s Typical V.35 Solution Using Six Components.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • www.exar.com

SP320_100_092208