®
SP334
Programmable RS-232/RS-485 Transceiver
s
+5V Only Operation
s
Software Programmable RS-232 or RS-
485 Selection
s
Three RS-232 Drivers and Five Receivers
in RS-232 Mode
s
Two RS-485 Full-Duplex Transceivers in
RS-485 Mode
s
Full Differential Driver Tri-State (Hi-Z)
Control
s
Receiver Output Tri-State Control
DESCRIPTION…
The
SP334
is a programmable RS-232 and/or RS-485 transceiver IC. The
SP334
contains three
drivers and five receivers when selected in RS-232 mode; and two drivers and two receivers when
selected in RS-485 mode.
The RS-232 transceivers can typically operate at 230kbps while adhering to the RS-232
specifications. The RS-485 transceivers can operate up to 10Mbps while adhering to the RS-485
specifications. The RS-485 drivers can be disabled (High-Z output) by the TXEN enable pin. The
RS-232 and RS-485 receiver outputs can be disabled by the RXEN enable pin.
TI3
TXEN(n/c)
TX4(n/c)
TX3
VCC
TX1
TX2
GND
C1+
V+
C2+
C1–
C2–
V–
1
2
3
4
5
6
7
8
9
10
11
12
13
14
SP334
28
27
26
25
24
23
22
21
20
19
18
17
16
15
TI2
TI1
RXEN
RS232/RS485
RI5
RX5
RX4
RX3
RX2
RX1
RI4
RI3
RI2
RI1
(in RS-232 mode)
SP334DS/10
Programmable RS-232/RS-485 Transceiver
© Copyright 2000 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation
of the device at these ratings or any other above those
indicated in the operation sections of the specifications
below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may
affect reliability.
V
CC
...........................................................................+7V
Storage Temperature..........................-65˚C to +150˚C
Power Dissipation
28-pin Plastic DIP...........................1000mW
28-pin Plastic SOIC.......................1000mW
Package Derating:
28-pin Plastic DIP
ø
JA
....................................................40
°C/W
28-pin Plastic SOIC
ø
JA
....................................................40
°C/W
SPECIFICATIONS
Typically 25°C @ Vcc = +5V unless otherwise noted.
MIN.
LOGIC INPUTS
V
IL
V
IH
LOGIC OUTPUTS
V
OL
V
OH
Output Tri-state Leakage
RS-232 DRIVER
DC Characteristics
HIGH Level Output
LOW Level Output
Open Circuit Voltage
Short Circuit Current
Power Off Impedance
AC Characteristics
Slew Rate
Transition Time
Maximum Data Rate
Propagation Delay
t
PHL
t
PLH
RS-232 RECEIVER
DC Characteristics
HIGH Threshold
LOW Threshold
Receiver Open Circuit Bias
Input Impedance
AC Characteristics
Maximum Data Rate
Propagation Delay
t
PHL
t
PLH
RS-485 DRIVER
DC Characteristics
Open Circuit Voltage
Differential Output
120
TYP.
MAX.
0.8
UNITS
Volts
Volts
Volts
Volts
µA
CONDITIONS
2.0
0.4
2.4
10
I
OUT
= -3.2mA
I
OUT
= 1.0mA
0.4V
≤
V
OUT
≤
+2.4V
+5.0
–15.0
–15
300
+15
–5.0
+15
±100
Volts
Volts
Volts
mA
Ω
V/µs
µs
kbps
R
L
=3kΩ, V
IN
=0.8V
R
L
=3kΩ, V
IN
=2.0V
V
OUT
= 0V
V
cc
= 0V, V
out
=
±2.0V
R
L
=3kΩ, C
L
= 50pF
V
CC
= +5.0V, T
A
@ +25°C
R
L
=3kΩ, C
L
=2500pF ;
between
±3V,
T
A
@ +25°C
R
L
=3kΩ, C
L
=2500pF
Measured from 1.5V of V
IN
to 50% of V
OUT
; R
L
=3kΩ
30
1.56
235
2
2
8
8
µs
µs
0.8
3
120
1.7
1.2
5
235
0.25
0.25
3.0
+2.0
7
Volts
Volts
Volts
kΩ
kbps
V
IN
= +15V to –15V
1
1
µs
µs
Measured from 50% of V
IN
to 1.5V of V
OUT
.
1.5
6.0
5.0
Volts
Volts
R
L
=54Ω, C
L
=50pF
SP334DS/10
Programmable RS-232/RS-485 Transceiver
© Copyright 2000 Sipex Corporation
2
SPECIFICATIONS
Typically 25°C @ Vcc = +5V unless otherwise noted.
MIN.
RS-485 DRIVER
Balance
Common-Mode Output
Output Current
Short Circuit Current
AC Characteristics
Maximum Data Rate
Output Transition Time
Propagation Delay
t
PHL
t
PLH
Driver Output Skew
RS-485 RECEIVER
DC Characteristics
Inputs
Common Mode Range
Receiver Sensitivity
Input Impedance
AC Characteristics
Maximum Data Rate
Propagation Delay
t
PHL
t
PLH
Differential Receiver Skew
TYP.
MAX.
±0.2
3.0
UNITS
Volts
Volts
mA
mA
Mbps
ns
CONDITIONS
|V
T
| - |V
T
|
R
L
=54Ω
Terminated in –7V to +10V
R
L
=54Ω
Rise/fall time, 10%–90%
See Figures 3A & 5
R
DIFF
=54Ω, C
L1
=C
L2
=100pF
R
DIFF
=54Ω, C
L1
=C
L2
=100pF
per figure 5, t
SKEW
= |t
DPLH
- t
DPHL
|
28.0
±250
10
30
80
80
5
120
120
20
ns
ns
ns
–7.0
12
10
130
130
10
15
+12.0
±0.2
Volts
Volts
kΩ
Mbps
–7V
≤
V
CM
≤
+12V
–7V
≤
V
CM
≤
+12V
200
200
20
ns
ns
ns
See Figures 3A & 7
R
DIFF
=54Ω, C
L1
=C
L2
=100pF
R
DIFF
=54Ω, C
L1
=C
L2
=100pF
t
SKEW
= | t
PLH
– t
PHL
|; R
DIFF
=54Ω,
C
L1
=C
L2
=100pF, see Figure 8
ENABLE TIMING
RS-485 Driver
Enable Time
Enable to Low
Enable to High
Disable Time
Disable From Low
Disable From High
RS-485 Receiver
Enable Time
Enable to Low
Enable to High
Disable Time
Disable From Low
Disable From High
POWER REQUIREMENTS
Supply Voltage V
CC
Supply Current I
CC
No Load (T
x
Disabled)
No Load (RS-232 Mode)
No Load (RS-485 Mode)
ENVIRONMENTAL
Operating Temperature
Commercial (..C..)
Industrial (..E..)
Storage Temperature
100
100
100
100
100
100
100
100
150
150
120
120
150
150
120
120
ns
ns
ns
ns
ns
ns
ns
ns
See Figures 4 & 6
C
L
=15pF, S
1
Closed
C
L
=15pF, S
2
Closed
See Figures 4 & 6
C
L
=15pF, S
1
Closed
C
L
=15pF, S
2
Closed
See Figures 2 & 8
C
L
=15pF, S
1
Closed
C
L
=15pF, S
2
Closed
See Figures 2 & 8
C
L
=15pF, S
1
Closed
C
L
=15pF, S
2
Closed
+4.75
12
20
15
+5.25
20
50
50
Volts
mA
mA
mA
TXEN = 0V
RS232/RS485 = 0V
RS232/RS485 = +5V
0
–40
–65
+70
+85
+150
°C
°C
°C
SP334DS/10
Programmable RS-232/RS-485 Transceiver
© Copyright 2000 Sipex Corporation
3
RECEIVER INPUT GRAPH
RS-485 RECEIVER
+1.0mA
–7V
–3V
+6V
+12V
–0.6mA
1 Unit Load
Maximum Input Current
versus Voltage
TEST CIRCUITS
A
R
V
OD
R
B
Figure 1. Driver DC Test Load Circuit
Figure 2. Receiver Timing Test Load Circuit
Receiver
Output
C
RL
Test Point
S
1
1KΩ
S
2
1KΩ
V
CC
V
OC
C
L1
DI
A
B
C
L2
R
L
A
RO
B
15pF
Output
Under
Test
500Ω
C
L
S
1
V
CC
S
2
Figure 3a. Driver/Receiver Timing Test Circuit
Figure 4. Driver Timing Test Load #2 Circuit
SP334DS/10
Programmable RS-232/RS-485 Transceiver
© Copyright 2000 Sipex Corporation
4
SWITCHING WAVEFORMS
f
≥
1MHz; t
R
≤
10ns; t
F
≤
10ns
1.5V
0V
B
DRIVER
OUTPUT
A
t
DPLH
t
DPHL
V
O
1/2V
O
t
PLH
t
PHL
1/2V
O
1.5V
+3V
DRIVER INPUT
DIFFERENTIAL V
O
+
OUTPUT 0V
V
A
– V
B
V
O
–
t
SKEW
= |t
DPLH
- t
DPHL
|
Figure 5. Driver Propagation Delays
t
R
t
F
+3V
T
x
EN
A, B
V
OL
V
OH
A, B
0V
0V
5V
f = 1MHz; t
R
≤
10ns; t
F
≤
10ns
1.5V
t
ZL
2.3V
Output normally LOW
1.5V
t
LZ
0.5V
0.5V
t
HZ
2.3V
t
ZH
Output normally HIGH
Figure 6. Driver Enable and Disable Times
V
0D2
+
A–B
V
0D2
–
f = 1MHz; t
R
≤
10ns; t
F
≤
10ns
0V
INPUT
0V
V
OH
RECEIVER OUT
V
OL
1.5V
t
PHL
OUTPUT
t
PLH
1.5V
Figure 7. Receiver Propagation Delays
SP334DS/10
Programmable RS-232/RS-485 Transceiver
© Copyright 2000 Sipex Corporation
5
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