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9
SP3238EDS/04
SP3238E +3.0V to +5.5V RS-232 Transceivers
Copyright 1999 Sipex Corporation
The
SP3238E
drivers can maintain high data
rates up to 250kbps fully loaded.
Figure 7
shows
a loopback test circuit used to test the RS-232
Drivers.
Figure 8
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 9
shows the test results
where one driver was active at 250kbps and all
three drivers loaded with an RS-232 receiver in
parallel with a 1000pF capacitor. A solid RS-232
data transmission rate of 120kbps provides
compatibility with many designs in personal
computer peripherals and LAN 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
circuitry is enabled or when in shutdown.
During the shutdown, the receivers will continue
to be active. If there is no activity present at the
receivers for a period longer than 100
μ
s or when
SHUTDOWN is enabled, the device goes into a
standby mode where the circuit draws 1
μ
A.
The truth table logic of the
driver and receiver
outputs can be found in
Table 2
.
Figure 7. Loopback Test Circuit for RS-232 Driver Data
Transmission Rates
The
SP3238E
includes an additional non-
inverting receiver with an output R
OUT. R
OUT
is an extra output that remains active and monitors
activity while the other receiver outputs are
forced into high impedance. This allows Ring
Indicator (RI) from a peripheral to be monitored
without forward biasing the TTL/CMOS inputs
of the other devices connected to the receiver
outputs.
Figure 8. Loopback Test Circuit Result at 120kbps
(All Drivers Fully Loaded)
Figure 9. Loopback Test Circuit result at 235kbps
(All Drivers Fully Loaded)
TBD
TBD
SP3238E
TxIN
TxOUT
C1+
C1-
C2+
C2-
V+
V-
V
CC
0.1
μ
F
0.1
μ
F
0.1
μ
F
+
C2
C5
C1
+
+
C3
C4
+
+
0.1
μ
F
0.1
μ
F
ILOGIC
V
CC
5k
RxIN
RxOUT
OULOGIC
SHUTDOWN
GND
V
CC
ONLINE
1000pF
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SP3238ECA/TR | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP3238ECA-L | 功能描述:RS-232接口集成電路 RS232 250 kbps 5Tx temp 0C to 70C RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| SP3238ECA-L/TR | 功能描述:RS-232接口集成電路 Intel. +3V to +5.5V RS-232 RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| SP3238ECY | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP3238ECY/TR | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
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