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SP3243EB 数据表(PDF) 11 Page - Sipex Corporation

部件名 SP3243EB
功能描述  Intelligent 3.0V to 5.5V RS-232 Transceivers
PDF  25 Pages
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制造商  SIPEX [Sipex Corporation]
网页  http://www.sipex.com
标志 SIPEX - Sipex Corporation

SP3243EB 数据表(HTML) 11 Page - Sipex Corporation

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Date: 6/2/04
SP3223EB/3243EB +3.0V to +5.5V RS-232 Transceivers
© Copyright 2004 Sipex Corporation
The SP3223EB and SP3243EB drivers can main-
tain high data rates up to 250kbps fully loaded.
Figure 17. shows a loopback test circuit used to
test the SP3243EB RS-232 Drivers. Figure 18
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 19 shows the test results where one driver
Table 2. SHUTDOWN and EN Truth Tables
Note: In AUTO ON-LINE® Mode where ONLINE =
GND and SHUTDOWN = V
CC, the device will shut down
if there is no activity present at the Receiver inputs.
Figure 17. Loopback Test Circuit for RS-232 Driver
Data Transmission Rates
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 250kbps 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.
Figure 18. Loopback Test Circuit All Drivers at 120kbps
Figure 19. Loopback Test Circuit One Driver at 250kbps
SP3223EB
SP3243EB
GND
T
1IN
T
XIN
C1+
C1-
C2+
C2-
V+
V-
VCC
0.1µF
0.1µF
0.1µF
+
C2
C5
C1
+
+
C3
C4
+
+
0.1µF
0.1µF
TTL/CMOS
INPUTS
+3V to +5V
18
SHUTDOWN
5kΩ
R
1OUT
5kΩ
R
XIN
R
XOUT
TTL/CMOS
OUTPUTS
EN
ONLINE
R
1IN
T
XOUT
T
1OUT
STATUS
VCC
To µP Supervisor
Circuit
1000pF
1000pF
DEVICE: SP3223EB
SHUTDOWN
EN
TXOUT
RXOUT
00
High Z
Active
01
High Z
High Z
10
Active
Active
11
Active
High Z
DEVICE: SP3243EB
SHUTDOWN
TXOUT
RXOUT
R2OUT
0
High Z
High Z
Active
1
Active
Active
Active



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