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(R)
SP332
RS-232/RS-485 Multi-Mode Serial Transceiver
s s s s s +5V-Only Single Supply Operation 4 Drivers, 4 Receivers RS-232 2 Drivers, 2 Receivers RS-485 Loop Back Function for Self Test 28 Pin SOIC Packaging
DESCRIPTION... The SP332 is a monolithic device that contains both RS-232 and RS-485 line drivers and receivers. The configuration of the SP332 can be changed at any time by changing the logic state of two control input pins. The device also includes a loop back function which internally connects driver outputs to receiver inputs for a chip self test. A Sipex-patented charge pump (5,306,954) allows +5V-only operation. RS-232 Mode
9 0.1F C1+ 12 C111 C2+ 13 C224 SEL A 2 SEL B 26 TI1
Vcc
400K
+5V 5 VCC
Full Duplex RS-485
+5V 5
V+ V10 14 0.1F LOOP 23 BACK TTL/CMOS 0.1F
9 0.1F 12
C1+ C1-
VCC
SP332
0.1F 0V 0V
0.1F +5V TTL/CMOS +5V TTL/CMOS
Vcc
400K
TTL/CMOS
T1
TX1 6
RS-232
11 C2+ 13 C224 SEL A 2 SEL B
Vcc
SP332
V+ V-
10 14 0.1F 23
0.1F
LOOP BACK
TTL/CMOS
TX2 7 T1 TX1 6
TTL/CMOS TTL/CMOS
27 TI2
Vcc
400K
T2 T3
TX2 7 TX3 4
RS-232
TTL/CMOS TTL/CMOS TTL/CMOS
26 TI1 27 TI2 28 TI3 1 TI4
Vcc
RS-485/RS-232 RS-485/RS-232 RS-485/RS-232 RS-485/RS-232 RS-485/RS-232 RS-485/RS-232 RS-485/RS-232 RS-485/RS-232
28 TI3
Vcc
400K
RS-232
TX4 3 T3 TX3 4 RI2 16 R1 RI1 15 RI4 18
TTL/CMOS
1 TI4
T4
TX4 3
RS-232
TTL/CMOS
TTL/CMOS 19 RX1 20 RX2 21 RX3 R1
5K
RI1 15 RI2 16
5K
RS-232
TTL/CMOS TTL/CMOS
19 RX1 20 RX2
TTL/CMOS TTL/CMOS
R2 R3
5K
RS-232
RI3 17
RS-232
TTL/CMOS
21 RX3
R3
RI3 17
TTL/CMOS
22 RX4 8
R4
5K
RI4 18
RS-232
TTL/CMOS
22 8
RX4 GND SHUT DOWN 25 TTL/CMOS
GND
SHUT DOWN
25
TTL/CMOS
TGoddard/SP332/9617R0
SP332 RS-232/RS-485 Multi-Mode Serial Transceiver
(c) 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. VCC............................................................................................................+12V Input Voltages Logic........................................................-0.5V to (VCC+0.5V) Drivers..................................................-0.5V to (VCC+0.5V) Receivers.................................................30V@100mA Driver Outputs......................................................................................15V Storage Temperature..................................................-65C to +150C Power Dissipation..........................................................................1000mW
SPECIFICATIONS
TMIN to TMAX and VCC = 5V5% unless otherwise noted.
PARAMETER RS-485 DRIVER DC Characteristics Differential Output Voltage Differential Output Voltage Differential Output Voltage Change in Magnitude of Driver Differential Output Voltage for Complementary States Driver Common-Mode Output Voltage Input High Voltage Input Low Voltage Input Current Pull-Up Current Pull-Down Current Driver Short-Circuit Current VOUT= HIGH VOUT= LOW AC Characteristics Driver Data Rate Driver Input to Output tPLH Driver Input to Output tPHL Driver Skew Driver Rise or Fall Time RS-485 RECEIVER DC Characteristics Differential Input Threshold Input Hysteresis Output Voltage High Output Voltage Low Input Resistance Input Current (A, B); VIN= 12V Input Current (A, B); VIN= -7V Short Circuit Current
MIN.
TYP.
MAX.
UNITS
CONDITIONS
GND 2.0 1.5
VCC 5.0 5.0
Volts Volts Volts
Unloaded; R=; see figure 1 With Load; R=50 (RS-422); see figure 1 With Load; R=27 (RS-485); see figure 1 R=27 or R=50; see figure 1 R=27 or R=50; see figure 1 Applies to transmitter inputs, SEL A, SEL B, SD, LB Applies to SEL A, SEL B, SD, LB Applies to: transmitter inputs, LB SEL A, SEL B, SD, -7VVO10V -7VVO10V
0.2 3 2.0 0.8 10 1.5 3.0 35 35 10 70 70 5 3 15 180 180 10 40 250 250
Volts Volts Volts Volts A A A mA mA Mbps ns ns ns ns
RDIFF=54, CL1=CL2=100pF; see figures 3 and 6 RDIFF=54, CL1=CL2=100pF; see figures 3 and 6 From output to output; see figures 3 and 6 From 10% to 90%; RDIFF=54, CL1=CL2=100pF; see figures 3 and 6
-0.2 70 3.5
+0.2 0.4
12
15 +1.5 -0.8 85
Volts mV Volts Volts k mA mA mA
-7VVCM12V VCM=0V IO=-4mA, VID=+200mV IO=+4mA, VID=-200mV -7VVCM12V VIN= 12V, A is the non-inverting receiver input. B is the inverting receiver input VIN= -7V 0VVCMVCC
TGoddard/SP332/9617R0
SP332 RS-232/RS-485 Multi-Mode Serial Transceiver
(c) Copyright 2000 Sipex Corporation
2
SPECIFICATIONS (CONTINUED)
TMIN to TMAX and VCC = 5V5% unless otherwise noted.
PARAMETER AC Characteristics Receiver Data Rate Receiver Input to Output tPLH Receiver Input to Output tPHL Diff. Receiver Skew |tPLH-tPHL| RS-232 DRIVER DC Characteristics TTL Input Levels VIL VIH Voltage Outputs High Level Output Low Level Output Open Circuit Output Short Circuit Current Power Off Impedance AC Characteristics Transmission Rate Transition Time Propagation Delay tPHL tPLH Slew Rate RS-232 RECEIVER TTL Output Levels VOL VOH Receiver Input High Threshold Low Threshold Input Voltage Range Input Impedance Hysteresis AC Characteristics Transmission Rate Transition Time Propagation Delay tPHL tPLH POWER REQUIREMENTS No Load Supply Current Full Load Supply Current
MIN. 10
TYP.
MAX.
UNITS Mbps ns ns ns
CONDITIONS
130 130 13
250 250
RDIFF=54, CL1=CL2=100pF; Figures 3 and 8 RDIFF=54, CL1=CL2=100pF; Figures 3 and 7 RDIFF=54, CL1=CL2=100pF; Figures 3 and 7
0.8 2.0 +5.0 -15.0 300 120 1.56 2 3 10 4 6 30 +15.0 -5.0 15 100
Volts Volts Volts Volts Volts mA Ohms kbps s s s V/s
Applies to transmitter inputs, SEL A, SEL B, SD, LB Applies to transmitter inputs, SEL A, SEL B, SD, LB RL=3k to Gnd RL=3k to Gnd RL= VOUT = 0V VCC=0V; VOUT= 2V
Rise/fall time, +3V to -3V; -3V to +3V RL=3k, CL=2500pF RL=3k, CL=2500pF; From 1.5V of TIN to 50% of VOUT RL=3k, CL=2500pF; From 1.5V of TIN to 50% of VOUT RL=3k, CL=50pF; From +3V to -3V or -3V to +3V
0.4 3.5 0.8 -15 3 0.2 120 50 100 100 19 90 300 200 25 120 2.1 1.6 5 0.5 3.0 +15 7 1.0
Volts Volts Volts Volts kOhms Volts kbps ns ns ns mA mA
ISINK = 4mA ISOURCE = -4mA
VIN=15V VCC=+5V
Rise/fall time 10% to 90% From 50% of VIN to 1.5V of ROUT From 50% of VIN to 1.5V of ROUT No load; VCC=5.0V; TA=25C RS-232 drivers R L=3k to Gnd; DC Input RS-485 drivers RL=54 from A to B; DC Input TA=25C, VCC=5.0V
Shutdown Supply Current
5
50
A
TGoddard/SP332/9617R0
SP332 RS-232/RS-485 Multi-Mode Serial Transceiver
(c) Copyright 2000 Sipex Corporation
3
A R VOD R B Figure 1. RS-485 Driver DC Test Load Circuit VOC Receiver Output
Test Point CRL 1K S1
1K VCC
S2 Figure 2. Receiver Timing Test Load Circuit
DI
A B
CL1 RDIFF CL2
A B
RO 15pF
Output Under C L Test
500
S1
VCC
S2
Figure 3. RS-485 Driver/Receiver Timing Test Circuit
Figure 4. RS-485 Driver Timing Test Load #2 Circuit
+3V DI 0V B DRIVER OUTPUT DIFFERENTIAL OUTPUT
f = 1MHz; tR 10ns; tF 10ns 1.5V 1.5V
tPLH VO 1/2VO tSKEW
tPHL
tPLH 1/2VO tSKEW
A
VO+
0V
VA - VB VO-
Figure 6. RS-485 Driver Propagation Delays
tR
tF
VOD2+ A-B VOD2- VOH R VOL tPHL
f = 1MHz; tR 10ns; tF 10ns 0V INPUT 0V
1.5V
OUTPUT
1.5V
tPHL
Figure 7. RS-485 Receiver Propagation Delays
TGoddard/SP332/9617R0
SP332 RS-232/RS-485 Multi-Mode Serial Transceiver
(c) Copyright 2000 Sipex Corporation
4
THEORY OF OPERATION... The SP332 is a single chip device that can be configured via software for either RS-232, RS485 or both interface modes at any time. The SP332 is made up of three basic circuit elements, single-ended drivers and receivers, differential drivers and receivers and charge pump. DIFFERENTIAL DRIVER/RECEIVER... RS-485, RS-422 Drivers... The differential drivers and receivers comply with the RS-485 and RS-422 standards. The driver circuits are able to drive a minimum of 1.5V when terminated with a 54 resistor across the two outputs. The typical propagation delay from the driver input to output is 60ns. The driver outputs are current limited to less than 250mA, and can tolerate short circuits to ground, or to any voltage within a +10V to -7V range with no damage. RS-485, RS-422 Receivers... The differential receivers of the SP332 comply with the RS-485, RS-422 and V.11 standards. The input to the receiver is equipped with a common mode range of +12V to -7V. The input threshold over this range is a minimum of 200mV. The differential receivers can receive data up to 10Mbps. The typical propagation delay from the receiver input to output is 90ns. SINGLE ENDED DRIVER/RECEIVER... RS-232 (V.28) Drivers... The single-ended drivers and receivers comply the with the RS-232E and V.28 standards. The drivers are inverting transmitters which accept either TTL or CMOS inputs and output the RS232 signals with an inverted sense relative to the input logic levels. Typically, the RS-232 driver output voltage swing is 9V with no load and is guaranteed to be greater than 5V under full load. The drivers rely on the V+ and V- voltages generated by the on-chip charge pump to maintain proper RS-232 output levels. With worst case load conditions of 3k and 2500pF, the four RS-232 drivers can still maintain 5V output levels. The drivers can operate up to 120kbps; the propagation delay from input to output is typically 2s.
RS-232 (V.28) Receivers... The RS-232 receivers convert RS-232 input signals to inverted TTL signals. Each of the four receivers features 500mV of hysteresis margin to minimize the affects of noisy tranmission lines. The inputs also have a 5k resistor to ground, in an open circuit situation the input of the receiver will be forced low, committing the output to a logic high state. The input resistance will maintain 3k-7k over a 15V range. The maximum operating voltage range for the receiver is 30V, under these conditions the input current to the receiver must be limited to less than 100mA. Due to the on-chip ESD protection circuitry, the receiver inputs will be clamped to 15V levels. The RS-232 receivers can operate up to 120kbps. CHARGE PUMP... The charge pump is a Sipex-patented design (5,306,954) and uses a unique approach compared to older less-efficient designs. The charge pump still requires four external capacitors, but uses a four-phase voltage shifting technique to attain symmetrical 10V power supplies. Figure 8a shows the waveform found on the positive side of capacitor C2, and Figure 8b shows the negative side of capacitor C2. There is a freerunning oscillator that controls the four phases of the voltage shifting. A description of each phase follows. Phase 1 -Vss charge storage- During this phase of the clock cycle, the positive side of capacitors C1 and C2 are initially charged to +5V. C1+ is then switched to ground and charge in C1- is transferred to C2-. Since C2+ is connected to +5V, the voltage potential across capacitor C2 is now 10V. Phase 2 -Vss transfer- Phase two of the clock connects the negative terminal of C2 to the Vss storage capacitor and the positive terminal of C2 to ground, and transfers the generated -10V to C3. Simultaneously, the positive side of capacitor C1 is switched to +5V and the negative side is connected to ground.
TGoddard/SP332/9617R0
SP332 RS-232/RS-485 Multi-Mode Serial Transceiver
(c) Copyright 2000 Sipex Corporation
5
1F VCC1 5V
1F T =
50 125 50
1F
1F VCC2 5V
1F
V.35
DX
1F P T S U SCTE (113) TXD (103) P S U W TXC (114) AA Y RXC (115) X V TXD (104) T R T T T T T
V.35
RX
DX
T
W AA
RX
+10V a) C2+ GND
1F 1F
RX
T
Y X
DX
RX
T
V T
DX
RX
T
R
DX
B VCC1 1F A
GND (102) CABLE SHIELD
B A VCC2 1F 1F
RS-232
DX DX RX RX RX
1F
1F
RS-232
RX RX DX DX DX DX RX
1F
GND b) C2-
OPTIONAL SIGNALS
H C E D F NN N
DTR (108) RTS (105) DSR (107) CTS (106) DCD (109) TM (142) RDL (140)
H C E D F NN N
-10V
RX DX
DX
L
LLB (141)
L
RX
ISO 2593 34-PIN DTE/DCE INTERFACE CONNECTOR
ISO 2593 34-PIN DTE/DCE INTERFACE CONNECTOR
Figure 8. Charge Pump Waveforms
VCC = +5V
VCC = +5V
+10V C1
+ -
C4
+ - +
+5V
C4
+ - +
C2
+ - -
VDD Storage Capacitor VSS Storage Capacitor
C1
+ -
C2
+ - -
VDD Storage Capacitor VSS Storage Capacitor
C3
-5V
-5V
C3
Figure 9. Charge Pump Phase 1
Figure 10. Charge Pump Phase 2
VCC = +5V
VCC = +5V
C4
+ - +
+5V VDD Storage Capacitor C1 VSS Storage Capacitor
+ -
C4
+ - +
C1
+ -
C2
+ - -
C2
+ - -
VDD Storage Capacitor VSS Storage Capacitor
-10V
C3
-5V
-5V
C3
Figure 11. Charge Pump Phase 3
Figure 12. Charge Pump Phase 4
TGoddard/SP332/9617R0
SP332 RS-232/RS-485 Multi-Mode Serial Transceiver
(c) Copyright 2000 Sipex Corporation
6
Phase 3 -Vdd charge storage- The third phase of the clock is identical to the first phase- the transferred charge in C1 produces -5V in the negative terminal of C1, which is applied to the negative side of capacitor C2. Since C2+ is at +5V, the voltage potential across C2 is 10V. Phase 4 -Vdd transfer- The fourth phase of the clock connects the negative terminal of C2 to ground and transfers the generated 10V across C2 to C4, the Vdd storage capacitor. Simultaneously with this, the positive side of capacitor C1 is switched to +5V and the negative side is connected to ground, and the cycle begins again.
Since both V+ and V- are separately generated from Vcc in a no load condition, V+ and V- will be symmetrical. Older charge pump approaches that generate V- from V+ will show a decrease in the magnitude of V- compared to V+ due to the inherent inefficiencies in the design. The clock rate for the charge pump typically operates at 15kHz. The external capacitors must be 0.1F with a 16V breakdown rating.
SP332 TYPICAL OPERATING CIRCUIT
RS-232 Mode
+5V 5 VCC
RS-485 Mode
+5V 5 9
9 0.1F
C1+
0.1F 0V 0V
12 C111 C2+ 13 C224 SEL A 2 SEL B 26 TI1
SP332
V+ V-
10 14
0.1F
C1+ C1-
VCC
0.1F
12
0.1F
0.1F LOOP 23 BACK T1 TX1 6
+5V
TTL/CMOS
Vcc
+5V
11 C2+ 13 C224 SEL A 2 SEL B
Vcc
400K
SP332
V+ V-
10 14 0.1F 23
0.1F
LOOP BACK
TTL/CMOS
400K
TX2 7 T1 TX1 6
TTL/CMOS
Vcc
400K
RS-232
TTL/CMOS TTL/CMOS
26 TI1 27 TI2
Vcc
RS-485 RS-485 RS-485 RS-485 RS-485 RS-485 RS-485 RS-485
TTL/CMOS TTL/CMOS
27 TI2
Vcc
400K
T2 T3
TX2 7 TX3 4
RS-232
TTL/CMOS
400K
TX4 3 T3 TX3 4 RI2 16 R1
15K
28 TI3 1 TI4
28 TI3
Vcc
400K
RS-232
TTL/CMOS TTL/CMOS
19 RX1 20 RX2
TTL/CMOS
1 TI4
T4
TX4 3
RS-232
RI1 15
15K
TTL/CMOS
RI4 18
TTL/CMOS
19 RX1 20 RX2 21 RX3
R1
5K
RI1 15 RI2 16
5K
RS-232
TTL/CMOS
21 RX3
R3
15K
RI3 17
15K
TTL/CMOS TTL/CMOS
R2 R3
5K
RS-232
TTL/CMOS
22 8
RX4 GND
RI3 17
SHUT DOWN
25
TTL/CMOS
RS-232
TTL/CMOS
22 RX4 8
R4
5K
RI4 18
RS-232
GND
SHUT DOWN
25
TTL/CMOS
TGoddard/SP332/9617R0
SP332 RS-232/RS-485 Multi-Mode Serial Transceiver
(c) Copyright 2000 Sipex Corporation
7
SP332 CONTROL LOGIC CONFIGURATION
SEL A SEL B LOOPBACK SHUTDOWN 0 0 1 0 0 1 1 0 1 0 1 0 1 1 1 0
26 TI1
T1
TX1 6 TX2 7 TX3 4
26 TI1
T1
TX1 6
26 TI1
TX2 7
TX1 6 T1 TX2 7
26 TI1
TX1 6 T1 TX2 7
27 TI2 28 TI3
T2 T3
27 TI2
T2
28 TI3
28 TI3 TX3 4 T3 TX4 3
T3
TX3 4 28 TI3 TX3 4 T3 TX4 3
1 TI4
T4
TX4 3
1 TI4
T4
TX4 3
19 RX1 20 RX2
R1
RI1 15
19 RX1
R1
RI1 15
19 RX1
RI2 16
RI1 15 R1 RI2 16
19 RX1
RI1 15 R1 RI2 16
R2 21 RX3 R3
RI2 16
20 RX2
R2
RI3 17
21 RX3 RI3 17 R3 RI4 18
21 RX3
R3
RI3 17 21 RX3 RI3 17 R3 RI4 18
22 RX4
R4
RI4 18
22 RX4
R4
RI4 18
SEL A SEL B LOOPBACK SHUTDOWN
0 0 0 0
0 1 0 0
1 0 0 0
1 1 0 0
26 TI1
T1
TX1 6 TX2 7 TX3 4
26 TI1 27 TI2
T1
TX1 6
26 TI1
TX2 7
TX1 6 T1 TX2 7
26 TI1
TX1 6 T1 TX2 7
27 TI2 28 TI3
T2 T3
T2
28 TI3
28 TI3 TX3 4 T3 TX4 3
T3
TX3 4
28 TI3 TX3 4 T3 TX4 3
1 TI4
T4
TX4 3
1 TI4
T4
TX4 3
19 RX1 20 RX2
R1
RI1 15 RI2 16 RI3 17
19 RX1 20 RX2
R1
RI1 15
RI1 15 19 RX1 R1 RI2 16
19 RX1
RI1 15 R1 RI2 16
R2 R3
R2
RI2 16
21 RX3
21 RX3
21 RX3 RI3 17 R3 RI4 18
R3
RI3 17
21 RX3 RI3 17 R3 RI4 18
22 RX4
R4
RI4 18
22 RX4
R4
RI4 18
Receiver Inputs are inactive in Loopback Mode (LOOPBACK = 0) Driver Outputs are Tri-Stated in Loopback Mode (LOOPBACK = 0) Unused Outputs are Tri-Stated
TGoddard/SP332/9617R0
SP332 RS-232/RS-485 Multi-Mode Serial Transceiver
(c) Copyright 2000 Sipex Corporation
8
TI4 SEL B TX4 TX3 VCC TX1 TX2 GND C1+ V+ C2+ C1C2V-
1 2 3 4 5 6 7 8 9 10 11 12 13 14
SP332
28 27 26 25 24 23 22 21 20 19 18 17 16 15
TI3 TI2 TI1 SD SEL A LB RX4 RX3 RX2 RX1 RI4 RI3 RI2 RI1
PACKAGE: PLASTIC SMALL OUTLINE (SOIC)
DIMENSIONS (Inches) Minimum/Maximum (mm) A 28-PIN
0.093/0.104 0.090/0.100 (2.352/2.649) (2.29/2.54) 0.004/0.012 0.004/0.010 (0.102/0.300) (0.102/0.254) 0.013/0.020 0.015/0.020 (0.330/0.508) (0.38/0.508) 0.697/0.713 0.720/0.730 (17.70/18.09) (18.24/18.54) 0.291/0.299 0.395/0.405 (7.402/7.600) (10.03/10.29) 0.050 BSC 0.050 BSC (1.270 BSC) (1.270 BSC) 0.394/0.419 0.531/0.545 (10.00/10.64) (13.49/13.84) 0.016/0.050 0.021/0.041 (0.406/1.270) (0.53/1.04) 0/8 0/8 (0/8) (0/8)
EH
A1 B D E e H L O
D A O e
TGoddard/SP332/9617R0
B
A1
L
SP332 RS-232/RS-485 Multi-Mode Serial Transceiver (c) Copyright 2000 Sipex Corporation
9
ORDERING INFORMATION
Model Temperature Range Package Types SP332CT .............................................................................. 0C to +70C ......................................................................................... 28-Pin SOIC SP332ET ............................................................................. -40C to +85C ........................................................................................ 28-Pin SOIC
Corporation
SIGNAL PROCESSING EXCELLENCE
Sipex Corporation Headquarters and Sales Office 22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others.
TGoddard/SP332/9617R0
SP332 RS-232/RS-485 Multi-Mode Serial Transceiver
(c) Copyright 2000 Sipex Corporation
10

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