SP3243EA 查看數據表（PDF） - Signal Processing Technologies
零件编号
产品描述 (功能)
生产厂家
SP3243EA Datasheet PDF : 23 Pages
| |||
DEVICE: SP3223
SHUTDOWN
EN
0
0
TXOUT
High Z
RXOUT
Active
0
1
High Z High Z
1
0
Active
Active
1
1
Active
High Z
DEVICE: SP3243
SHUTDOWN
0
TXOUT
High Z
RXOUT
High Z
R2OUT
Active
1
Active
Active
Active
Table 2. SHUTDOWN and EN Truth Tables
Note: In AUTO ON-LINE® Mode where ONLINE =
GND and SHUTDOWN = VCC, the device will shut down
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-
+3V to +5V
+
C5 0.1µF
+
C1 0.1µF
2 C1+
4 C1-
+
C2 0.1µF
5 C2+
6 C2-
TTL/CMOS
INPUTS
T1IN
TXIN
19
VCC
V+ 3
SP3223
SP3243
V- 7
T1OUT
TXOUT
+
C3 0.1µF
C4 0.1µF
+
TTL/CMOS
OUTPUTS
VCC
To µP Supervisor
Circuit
R1OUT
R1IN
5KΩ
RXOUT
1 EN
RXIN
5KΩ
20 SHUTDOWN
14 ONLINE
11 STATUS
GND
18
1000pF
1000pF
Figure 12. Loopback Test Circuit for RS-232 Driver
Data Transmission Rates
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.
T1 IN
T1 OUT
R1 OUT
T1 IN
T1 OUT
R1 OUT
Figure 13. Loopback Test Circuit Result at 120Kbps
(All Drivers Fully Loaded)
Figure 14. Loopback Test Circuit result at 235Kbps
(All Drivers Fully Loaded)
Rev. 6/30/03
SP3223 +3.0V to +5.5V RS-232 Transceivers
© Copyright 2003 Sipex Corporation
11
Share Link: 