SP3223H Datasheet, PDF (11/23 Pages) Sipex Corporation – High Speed Intelligent +3.0V to +5.5V RS-232 Transceivers

DEVICE: SP3223H
SHUTDOWN
EN
0
0
T_XOUT
High Z
R_XOUT
Active
0
1
High Z High Z
1
0
Active
Active
1
1
Active
High Z
DEVICE: SP3243H
SHUTDOWN
0
T OUT
X
High Z
R OUT
X
High Z
R OUT
2
Active
1
Active
Active
Active
Table 2. SHUTDOWN and EN Truth Tables
Note: In Auto-Online Mode where ONLINE = GND and
SHUTDOWN = V_CC, the device will shut down if there is
no activity present at the Receiver inputs.
The SP3223H and SP3243H drivers can main-
tain high data rates over 460Kbps fully loaded.
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 at 120Kbps with typical
RS-232 loads in parallel with 1000pF capacitors.
Figure 14 shows the test results where one driver
was active at 1Mbps and all three drivers loaded
with an RS-232 receiver in parallel with a 1000pF
+3V to +5V
+
C5 0.1µF
+
C1 0.1µF
2 _C1+
4 C1-
+
C2 0.1µF
5 C2+
6 C2-
19
VCC
SP3223H
SP3243H
V+ ³
V- ⁷
TTL/CMOS
INPUTS
T₁IN
T_XIN
T₁OUT
T_XOUT
+
C3 0.1µF
C4 0.1µF
+
TTL/CMOS
OUTPUTS
VCC
To µP Supervisor
Circuit
R₁OUT
R₁IN
5KΩ
R_XOUT
1 _EN
R_XIN
5KΩ
20
SHUTDOWN
14 _ONLINE
11 _STATUS
GND
18
1000pF
1000pF
Figure 12. Loopback Test Circuit for RS-232 Driver
Data Transmission Rates
capacitor. A superior RS-232 data transmission
rate of 1Mbps makes the SP3223H/3243H se-
ries an ideal match for high speed LAN and
personal computer peripheral applications.
Receivers
The receivers convert +5.0V EIA/TIA-232
levels to TTL or CMOS logic output levels. All
receivers have an inverting output that can be
disabled by using the EN pin.
Receivers are active when the Auto-Online
Figure 13. Loopback Test Circuit 1 Driver Fully Loaded
Figure 14. Loopback Test Circuit
(All Drivers Fully Loaded)
Rev. 6/30/03
SP3223H +3.0V to +5.5V RS-232 Transceivers
11
© Copyright 2003 Sipex Corporation