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SP3221ECA/TR датащи(PDF) 8 Page - Sipex Corporation

номер детали SP3221ECA/TR
подробное описание детали  Intelligent 3.0V to 5.5V RS-232 Transceiver
PDF  18 Pages
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производитель  SIPEX [Sipex Corporation]
домашняя страница  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP3221ECA/TR датащи(HTML) 8 Page - Sipex Corporation

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Date: 7/21/04
SP3221E +3.0V to +5.5V RS-232 Transceiver
© Copyright 2004 Sipex Corporation
8
Receivers
The receiver converts
±5.0V EIA/TIA-232
levels to TTL or CMOS logic output levels. The
receiver has an inverting output that can be
disabled by using the EN pin.
The receiver is active when the Auto-Online
circuitry is enabled or when in shutdown.
During the shutdown, the receiver will continue
to be active.
Driving EN to a logic HIGH forces the output of
the receiver into high-impedance.
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.
Figure 6. Loopback Test Circuit for RS-232 Driver Data
Transmission Rates
Since receiver input is usually from a transmis-
sion line where long cable lengths and system
interference can degrade the signal, the inputs
have a typical hysteresis margin of 300mV. This
ensures that the receiver is virtually immune to
noisy transmission lines. Should an input be left
unconnected, an internal 5K
Ω pulldown resistor
to ground will commit the output of the receiver
to a HIGH state.
Figure 7. Loopback Test Circuit Result at 250Kbps
(Driver Fully Loaded)
Figure 8. Loopback Test Circuit result at 235Kbps
(Driver Fully Loaded)
Ch1
Ch3
3
1
2
T
T
T
T
[]
T1 IN
T1 OUT
R1 OUT
5.00V
Ch2 5.00V M 5.00µs Ch1
0V
5.00V
3
1
2
T
T
T
T
[]
T1 IN
T1 OUT
R1 OUT
Ch1
Ch3
5.00V
Ch2 5.00V M 2.50µs Ch1
0V
5.00V
E
1
2
2
3
P
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SP3221E
2
4
6
5
3
7
19
GND
T
1IN
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
20
5KΩ
R
1OUT
TTL/CMOS
OUTPUTS
EN
1
ONLINE
14
R
1IN
T
1OUT
11
STATUS
VCC
To µP Supervisor
Circuit
1000pF
11
9
13
8



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