SP334
Programmable RS-232/RS-485 Transceiver
• +5V Single Supply Operation
• Software Programmable RS-232 or RS-485
Selection
• Three RS-232 Drivers and Five Receivers
in RS-232 Mode
• Two RS-485 Full-Duplex Transceivers in
RS-485 Mode
• Full Differential Driver Tri-State (Hi-Z) Control
• Receiver Output Tri-State Control
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
28
27
26
25
24
23
22
21
20
19
18
17
16
15
SP334
TI2
TI1
RXEN
RS232/RS485
RI5
RX5
RX4
RX3
RX2
RX1
RI4
RI3
RI2
RI1
(in RS-232 Mode)
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 0Mbps
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 pin.
TYPICAL APPLICATIONS CIRCUIT
+5V
5
C1+
C1-
C2+
C2-
TXEN
Vcc
400KΩ
9
0.1µF
0.1µF
12
11
13
2
VCC
SP334
V+
V-
10
14
0.1µF
0.1µF
TTL/CMOS
TTL/CMOS
TX2 7
T1
TX1 6
TX4 3
T3
TX3 4
RI1 15
R1
15KΩ
15KΩ
27 TI1
RS-485
RS-485
RS-485
RS-485
RS-485
RS-485
RS-485
RS-485
Vcc
TTL/CMOS
1
TI3
400KΩ
TTL/CMOS
19 RX1
RI2 16
RI4 18
TTL/CMOS
TTL/CMOS
21 RX3
26
8
RXEN
GND
R3
15KΩ
RI3 17
15KΩ
RS232/ RS485
25
+5V
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
SP334_00_090909
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
Input Voltages
Logic............................-0.5V to (Vcc+0.5V)
Drivers.........................-0.5V to (Vcc+0.5V)
Receivers......................+/-30V @ ≤100mA
Driver Outputs..................................................+/-5V
Maximum Data Rate...........................8Mbps (note )
Storage Temperature.......................-65˚C to +150˚C
Power Dissipation
28-pin WSOIC...................................000mW
Package Derating:
28-pin WSOIC
ø
JA
................................................40 °C/W
Note : Exceeding the maximum data rate of 8Mbps at T
A
= 85°C may permanently damage the device
SPECIFICATIONS
PARAMETER
Logic Inputs
V
IL
V
IH
LOGIC OUTPUTS
V
OL
V
OH
Limits are specified at T
A
= 25°C and V
CC
= +5.0V unless otherwise noted.
MIN.
TYP.
MAX.
0.8
UNITS
Volts
Volts
CONDITIONS
2.0
0.4
2.4
0
Volts
Volts
µA
I
OUT
= -3.2mA
I
OUT
= .0mA
0.4V ≤ V
OUT
≤ +2.4V
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
Transistion Time
Maximum Data Rate
Propagation Delay t
PHL
Propagation Delay t
PLH
RS-232 RECEIVER
DC Characteristics
HIGH Threshold
LOW Threshold
Receiver Open Circuit Bias
Input Impedance
3
0.8
20
300
+5.0
-5.0
-5
+5.0
-5.0
+5
+/-00
Volts
Volts
Volts
mA
Ω
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 .5V of V
IN
to 50%
of V
OUT
; R
L
= 3kΩ
30
.56
235
2
2
8
8
V/µs
µs
kbps
µs
µs
.7
.2
3.0
+2.0
Volts
Volts
Volts
kΩ
V
IN
= +5V to -5V
SP334_00_090909
5
7
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
2
SPECIFICATIONS
PARAMETER
Limits are specifed at T
A
= 25°C and V
CC
= +5.0V unless otherwise
MIN.
TYP.
MAX.
UNITS
CONDITIONS
RS-232 RECEIVER (continued)
AC Characteristics
Maximum Data Rate
Propagation Delay t
PHL
Propagation Delay t
PLH
RS-485 DRIVER
DC Characteristics
Open circuit Voltage
Differential Output
Balance
Common-Mode Output
Output Current
Short Circuit Current
AC Characteristics
Maximum Data Rate
Maximum Data Rate
Output Transition Time
Propagation Delay t
PHL
Propagation Delay t
PLH
Driver Output Skew
RS-485 RECEIVER
DC Characteristics
Common Mode Range
Receiver Sensitivity
Input Impedance
AC Characteristics
Maximum Data Rate
Maximum Data Rate
Propagation Delay t
PHL
Propagation Delay t
PLH
Differential Receiver Skew
ENABLE TIMING
RS-485 DRIVER
Enable Time
Enable to LOW
Enable to HIGH
(see Figures 4 and 6)
00
00
50
50
ns
ns
C
L
= 5pF, S
Closed
C
L
= 5pF, S
2
Closed
30
30
0
0
8
200
200
20
Mbps
Mbps
ns
ns
ns
T
A
= +85°C, Note
See Figures 3 & 7, R
DIFF
= 54Ω,
C
L
= C
L2
= 00pF
t
SKEW
= |t
PHL
- t
PLH
|, R
DIFF
= 54Ω,
C
L
= C
L2
= 00pF, see Figure 8
2
5
-7.0
+2
+/-0.2
Volts
Volts
kΩ
-7V ≤ V
CM
≤ +12V
-7V ≤ V
CM
≤ +12V
30
80
80
5
20
20
20
0
8
Mbps
Mbps
ns
ns
ns
ns
R
L
= 54Ω
R
L
= 54Ω, T
A
= +85°C, Note
Rise/Fall time, 0%-90%
See Figures 3 & 5, R
DIFF
= 54Ω,
C
L
= C
L2
= 00pF
Per Figure 5, t
SKEW
= |t
DPHL
- t
DPLH
|
28.0
+/-250
.5
6.0
5.0
+/-0.2
3.0
Volts
Volts
Volts
Volts
mA
mA
R
L
= 54Ω
Terminated in -7V to +0V
R
L
= 54Ω, C
L
= 50pF
|V
T
| - |V
T
|
20
235
0.25
0.25
kbps
µs
µs
Measured from 50% of V
IN
to .5V
of V
OUT
Note : Exceeding the maximum data rate of 8Mbps at T
A
= 85°C may damage the device.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
SP334_00_090909
3
SPECIFICATIONS
PARAMETER
Limits are specifed at T
A
= 25°C and V
CC
= +5.0V unless otherwise
MIN.
TYP.
MAX.
UNITS
CONDITIONS
RS-485 Driver Continued
Disable Time (see Figures 4 and 6)
Disable from LOW
Disable from HIGH
RS-485 RECEIVER
Enable Time
Enable to LOW
Enable to HIGH
Disable Time (see Figures 2 and 8)
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
0
-40
-65
70
+85
+50
ºC
ºC
ºC
2
20
5
20
50
50
mA
mA
mA
TXEN = 0V
RS232/RS485 = 0V
RS232/RS485 = +5V
+4.75
+5.25
Volts
00
00
20
20
ns
ns
C
L
= 5pF, S
Closed
C
L
= 5pF, S
2
Closed
(see Figures 2 and 8)
00
00
50
50
ns
ns
C
L
= 5pF, S
Closed
C
L
= 5pF, S
2
Closed
00
00
20
20
ns
ns
C
L
= 5pF, S
Closed
C
L
= 5pF, S
2
Closed
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
SP334_00_090909
4
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 . Driver DC Test Load Circuit
Receiver
Output
V
OC
Test Point
S
1
C
RL
1kΩ
S
2
1kΩ
V
CC
Figure 2. Receiver Timing Test Load Circuit
DI
A
B
C
L1
R
L
C
L2
A
B
RO
15pF
Output
Under
Test
500Ω
C
L
S
1
V
CC
S
2
Figure 3. Driver/Receiver Timing Test Circuit
Figure 4. Driver Timing Test Load #2 Circuit
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
SP334_00_090909
5
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