SP3223 Sipex, SP3223 Datasheet - Page 11

• Manufacturer Part Number: SP3223
• Description: Intelligent +3.0V to +5.5V RS-232 Transceivers
• Manufacturer: Sipex

Table 2. SHUTDOWN and EN Truth Tables
Note: In AUTO ON-LINE
GND and SHUTDOWN = V
if there is no activity present at the Receiver inputs.
Figure 12 shows a loopback test circuit used to
test the RS-232 Drivers. Figure 13 shows the test
results of the loopback circuit with all three
drivers active (SP3243) at 120Kbps with typical
RS-232 loads in parallel with 1000pF capacitors.
Figure 14 shows the test results where one driver
was active at 235Kbps and all three drivers
loaded with an RS-232 receiver in parallel with
a 1000pF capacitor. A solid RS-232 data trans-
Figure 13. Loopback Test Circuit Result at 120Kbps
(All Drivers Fully Loaded)
Rev. 6/30/03
D
D
S
S
R1 OUT
T1 OUT
E
E
H
H
V
V
T1 IN
U
U
C I
C I
T
T
0
0
0
D
D
1
1
1
: E
: E
O
O
W
W
S
S
P
N
P
N
3
3
2
2
2
4
3
3
T
H
A
X
g i
E
c
O
0
0
1
1
v i t
N
h
U
e
Z
T
CC
®
, the device will shut down
Mode where ONLINE =
T
R
H
H
H
A
A
A
X
X
g i
g i
g i
c
c
c
O
O
v i t
v i t
v i t
h
h
h
U
U
e
e
e
Z
Z
Z
T
T
SP3223 +3.0V to +5.5V RS-232 Transceivers
R
R
H
H
A
A
A
A
X
2
g i
g i
c
c
c
c
O
O
v i t
v i t
v i t
v i t
h
h
U
U
e
e
e
e
Z
Z
T
T
11
mission rate of 120Kbps provides compatibility
with many designs in personal computer periph-
erals and LAN applications.
Receivers
The receivers convert ±5.0V EIA/TIA-232
levels to TTL or CMOS logic output levels.
Receivers have an inverting output that can be
disabled by using the EN pin.
Figure 12. Loopback Test Circuit for RS-232 Driver
Data Transmission Rates
Figure 14. Loopback Test Circuit result at 235Kbps
(All Drivers Fully Loaded)
R1 OUT
T1 OUT
T1 IN
To µP Supervisor
Circuit
TTL/CMOS
TTL/CMOS
OUTPUTS
INPUTS
C2
C5
C1
V
CC
+
+
+
0.1µF
0.1µF
0.1µF
20
14
11
1
2
4
5
6
C1+
C1-
R
C2+
C2-
T
T
R
EN
SHUTDOWN
ONLINE
STATUS
1
X
1
X
IN
IN
OUT
OUT
SP3223
SP3243
+3V to +5V
V
© Copyright 2003 Sipex Corporation
GND
CC
19
18
5KΩ
5KΩ
T
T
1
X
R
R
OUT
OUT
1
X
V+
IN
IN
V-
3
7
1000pF
C3
C4
+
+
0.1µF
0.1µF
1000pF