SP3223EH Datasheet, PDF (11/24 Pages) Sipex Corporation – High Speed Intelligent +3.0V to +5.5V RS-232 Transceivers

DEVICE: SP3223EH
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: SP3243EH
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 SP3223EH and SP3243EH drivers can
maintain 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
+3V to +5V
+
C5 0.1µF
+
C1 0.1µF
+
C2 0.1µF
2 _C1+
4 C1-
5 C2+
6 C2-
19
VCC
SP3223EH
SP3243EH
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
with an RS-232 receiver in parallel with a 1000pF
capacitor. A superior RS-232 data transmission
rate of 1Mbps makes the SP3223EH/3243EH
series 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.
Figure 13. Loopback Test Circuit 1 Driver Fully Loaded
Figure 14. Loopback Test Circuit
(All Drivers Fully Loaded)
SP3223EHDS/11
SP3223EH +3.0V to +5.5V RS-232 Transceivers
© Copyright 2000 Sipex Corporation
11