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SP3243B 데이터시트(PDF) 11 Page - Sipex Corporation

부품명 SP3243B
상세설명  Intelligent 3.0V to 5.5V RS-232 Transceivers
PDF  24 Pages
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제조업체  SIPEX [Sipex Corporation]
홈페이지  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP3243B 데이터시트(HTML) 11 Page - Sipex Corporation

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11
Rev. 6/30/03
SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers
© Copyright 2003 Sipex Corporation
The SP3223B and SP3243B drivers can main-
tain high data rates up to 250kbps fully loaded.
Figure 17. shows a loopback test circuit used to
test the SP3243B 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
SP3223B
SP3243B
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: SP3223B
SHUTDOWN
EN
TXOUT
RXOUT
00
High Z
Active
01
High Z
High Z
10
Active
Active
11
Active
High Z
DEVICE: SP3243B
SHUTDOWN
TXOUT
RXOUT
R2OUT
0
High Z
High Z
Active
1
Active
Active
Active



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