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 Corporation
SP306 RS-422/RS-423 Line Drivers/Receivers
SIGNAL PROCESSING EXCELLENCE
s Single chip serial transceiver supports RS-422 or RS-423 interfaces s Programmable Selection of Interface s Two Full-Duplex Channels of Either Interface s Software-Selectable Mode s Loopback for Self-Testing s Short-Circuit Protected s Surface Mount Packaging
DESCRIPTION... The SP306 is a single chip device that offers both RS-422 and RS-423-type serial interfaces. The device can be programmed to provide two full-duplex channels of either RS-422 or RS-423 via two mode control pins. The SP306 also features a loopback function that can be activated in any operating mode. The SP306 is available in a 28-pin SOIC package for operation over the commercial temperature range.
SUPPLY +5V +12V -12V
28 1 15 VCC VDD VEE 7 8 22 SELECT A SELECT B LOOPBACK 6 T1 5 9 T2 SP306 ROUTA 26 R1 10 2 3
TINA
23
TOUTA1 TOUTA2 TOUTB1 TOUTB2 RINA2 RINA1
TINB
20
ROUTB
17 14
13 R2 GND 12
RINB2 RINB1
Corporation
89
SIGNAL PROCESSING EXCELLENCE
SPECIFICATIONS
(TMIN T A T MAX and nominal supply voltages unless otherwise noted)
PARAMETER RS-423 DRIVER TTL Input Level VIL VIH High Level Output Low Level Output
MIN.
TYP.
MAX.
UNIT
CONDITIONS
0 2.0 +3.0 -3.0 720
0.8 +6.0 (VDD - 0.7V) -6.0 (VEE +0.7V) 40
6.0 Short Circuit Current 100 Output Current 500 Transition Time 400 Maximum Transmission Rate 500 RS-422 RECEIVER Common Mode Range 7 Differential Input 15 Differential Input Threshold -0.2 +0.2 Input Voltage Hysteresis 30 Input Resistance 3 TTL Output Level VOL 0.4 VOH 2.4 Maximum Receiving Rate 500 Short Circuit Output Current 120 POWER REQUIREIMENTS VDD = +12V 7 15 VCC = +5V 5 7 VEE = -12V 11 20 ENVIRONMENTAL AND MECHANICAL Operating Temperature -C 0 +70 -M -55 +125 Storage Temperature -65 +150 Package -C 28-pin SOIC -F 28-pin Ceramic Flatpack
Short Circuit Current Transition Time Maximum Transmission Rate 100 RS-423 RECEIVER Input Threshold -200 Input Impedance 4 TTL Output Level VOL VOH 2.4 Maximum Receiving Rate 100 RS-422 DRIVER TTL Input Level VIL 0 VIH 2.0 High Level Output +2.75 Low Level Output Differential Output 2.0
V V V V V V mA ns kbps mV k V V kbps
RL = 450, VIN = 0.8V; Note 6 RL = RL = 450, VIN = 2.0V; Note 6 RL = VOUT = 0V; Note 2 RL = 450, CL = 50pF; Note 3 Common-mode = 7V; Note 1 RIN = 10V VCC =+4.75V, IOUT =+1.6mA VCC =+4.75V, IOUT =-0.5mA Note 3
+200 0.4
0.8 +6 +1.0
V V V V V V mA A ns kbps V V V mV k V V kbps mA mA mA mA
IOH = -20mA IOL = 20mA RL = 100 RL = -0.25V VO 6V; Power off RL =450, CL =15pF; Note 3
Note 4 Note 4 TA=25C VCM =0V;TA=25C -7VVCM+7V VCC =+4.75V, IOUT=+1.6mA VCC =+4.75V, IOUT=-0.5mA VOUT=0V All Transmitter outputs RL= TA=25C
C C C
90
Corporation
SIGNAL PROCESSING EXCELLENCE
Note: 1. The common mode voltage is defined as the algebraic mean of the two voltages appearing at the receiver input terminals with respect to the receiver circuit ground. 2. Only one output drive pin per package will be shorted at any time. 3. From 10% to 90% of steady state. 4. This is an absolute maximum rating. Normal operating levels are VIN 5V. 5. Outputs unloaded. Inputs tied to GND; TA =+25C; VIL = 0V; LB = 0. 6. VOL/VOH will typically be 3V over -55C to +125C with 450 loads.
PINOUT
VDD RINA2 RINA1 N.C. TOUTA2 TOUTA1 SELECTA SELECTB TOUTB1 1 2 3 4 5 6 7 8 9 28 VCC 27 N.C. 26 ROUTA 25 N.C. 24 N.C. 23 TINA 22 LOOPBACK 21 N.C. 20 TINB 19 N.C. 18 N.C. 17 ROUTB 16 N.C. 15 VEE
SP306
TOUTB2 10 N.C. 11 RINB1 12 RINB2 13 GND 14
PIN ASSIGNMENTS Pin 1 -- VDD -- +12V Power Supply. Pin 2 -- RINA2 -- RS422 input. Pin 3 -- RINA1 -- RS422/RS423 input. Pin 4 -- N.C. -- No Connection. Pin 5 -- TOUTA2 --RS422 output. Pin 6 -- TOUTA1 -- RS422/RS423 output. Pin 7 -- SEL A -- Select A; used with Select B (pin 8) to select operating mode; please refer to SP306 Control Logic Configuration section for truth table. Pin 8 -- SEL B -- Select B; used with Select A (pin 7) to select operating mode; please refer to SP306 Control Logic Configuration section for truth table. Pin 9-- TOUTB1-- RS422/RS423 output. Pin 10 -- TOUTB2 -- RS422 output. Pin 11 -- N.C. -- No Connection. Pin 12-- RINB1-- RS422/RS423 input.
Pin 13 -- RINB2-- RS422 input Pin 14 -- GND -- Signal ground. Connected to logic and chasis ground. Pin 15 -- VEE -- -12V Power Supply. Pin 16 -- N.C. -- No Connection. Pin 17 -- ROUTB -- TTL output. Pin 18 -- N.C. -- No Connection. Pin 19 -- N.C. -- No Connection. Pin 20 -- TINB -- TTL input. Pin 21 -- N.C. -- No Connection. Pin 22 -- LOOPBACK -- Active low; logic "1" selects operating mode controlled by SELECT A and SELECT B; logic "0" selects loopback configuration for whatever operating mode is selected by states of SELECT A and SELECT B. Pin 23 -- TINA -- TTL input. Pin 24 -- N.C. -- No Connection. Pin 25 -- N.C. -- No Connection. Pin 26 -- ROUTA -- TTL output. Pin 27 -- N.C. -- No Connection. Pin 28 -- VCC -- +5V Power Supply. FEATURES... The SP306 is a single chip device that offers both RS-422 and RS-423 serial interfaces. The device can be programmed via two control mode pins (7 and 8). In either operating mode, the SP306 provides two full-duplex channels. A loopback function is also provided for chip self- test, which connects driver outputs to receiver inputs with no external circuitry. The RS-422 drivers convert TTL logic levels into RS-422 differential output signals. The RS-422 line driver outputs feature high source
Corporation
91
SIGNAL PROCESSING EXCELLENCE
and sink current capability. The RS423 line drivers convert TTL logic levels into inverted RS-423 output signals. All line drivers are internally protected against short circuits on their outputs. The RS-422 receivers convert the RS-422 differential input signals into non-inverted TTL logic levels. Receiver input thresholds are 200mV. The RS-422 receivers can receive input data up to 1Mbps. The RS-423 receivers convert the RS-423 input signals into inverted TTL output logic levels. The RS-423 receivers have an input threshold of 200mV, and can receive data up to 100kbps. A loopback test mode is provided that puts the driver outputs into a high impedance tri-state level, and routes the driver outputs to their associated receiver inputs. In this configuration,
the signal path is non-inverting from the TTL driver inputs to the receiver TTL outputs. This operating mode allows the controlling system to perform diagnostic self-test of the RS-422/ RS-423 transceiver circuitry at speeds up to 3kbps. APPLICATION INFORMATION Control Logic Configuration Software control of the SP306 is via two select pins (7 and 8) and a loopback control pin (22). SELECT A and SELECT B allow the user to program the SP306 for four different interface modes. Loopback mode can be selected in any of these interface modes. The figures that follow outline the various operating modes that are supported by the SP306.
SUPPLY +5V +12V -12V
SUPPLY +5V +12V -12V
28 1 15 VCC VDD VEE SELECT A = 0 SELECT B = 0 LOOPBACK = 1 7 8 22 SELECT A SELECT B LOOPBACK SELECT A = 0 SELECT B = 0 LOOPBACK = 0 7 8 22
28 1 15 VCC VDD VEE SELECT A SELECT B LOOPBACK
TOUTA1 RINA1
TINA ROUTA
TOUTA*1 RINA1
TINA ROUTA
TOUTB1 RINB1
TINB ROUTB
TOUTB*1 RINB1
TINB ROUTB
14
GND
14 SP306
GND
SP306
RS-423 DRIVER * Tri-state output
RS-423 RECEIVER
RS-422 RECEIVER
RS-422 DRIVER * Tri-state output
Figure 1. Control Input Configuration -- SELECT A = 0, SELECT B = 0
92
Corporation
SIGNAL PROCESSING EXCELLENCE
SUPPLY +5V +12V -12V
SUPPLY +5V +12V -12V
28 1 15 VCC VDD VEE SELECT A = 0 SELECT B = 1 LOOPBACK = 1 7 8 22 SELECT A SELECT B
LOOPBACK SELECT A = 0 SELECT B = 1 LOOPBACK = 0
28 1 15 VCC VDD VEE 7 8 22 SELECT A SELECT B
LOOPBACK
TOUTA1 RINA1
TINA ROUTA
TOUTA*1 RINA1
TINA ROUTA
RINB2 RINB1 TOUTB1 TOUTB2
ROUTB
RINB2 RINB1 TOUTB*1 TOUTB*2
ROUTB
TINB
TINB
14
GND
14 SP306
GND
SP306
RS-423 DRIVER * Tri-state output
RS-423 RECEIVER
RS-422 RECEIVER
RS-422 DRIVER * Tri-state output
Figure 2. Control Input Configuration -- SELECT A = 0, SELECT B = 1
SUPPLY +5V +12V -12V
SUPPLY +5V +12V -12V
28 1 15 VCC VDD VEE SELECT A = 1 SELECT B = 0 LOOPBACK = 1
RINA2 RINA1 TOUTA1 TOUTA2
28 1 15 VCC VDD VEE SELECT A = 1 SELECT B = 0 LOOPBACK = 0
RINA2 RINA1 TOUTA*1 TOUTA*2
7 8 22
SELECT A SELECT B
LOOPBACK
7 8 22
SELECT A SELECT B
LOOPBACK
ROUTA
ROUTA
TINA
TINA
TOUTB 1 RINB1
TINB ROUTB
TOUTB *1 RINB1
TINB ROUTB
14
GND
14 SP306
GND
SP306
RS-423 DRIVER * Tri-state output
RS-423 RECEIVER
RS-422 RECEIVER
RS-422 DRIVER * Tri-state output
Figure 3. Control Input Configuration -- SELECT A = 1, SELECT B = 0
Corporation
93
SIGNAL PROCESSING EXCELLENCE
SUPPLY +5V +12V -12V
SUPPLY +5V +12V -12V
28 1 15 VCC VDD VEE SELECT A = 1 SELECT B = 1 LOOPBACK = 1
RINA2 RINA1 TOUTA1 TOUTA2 RINB2 RINB1 TOUTB1 TOUTB2
28 1 15 VCC VDD VEE SELECT A = 1 SELECT B = 1 LOOPBACK = 0
RINA2 RINA1 TOUTA*1 TOUTA*2 RINB2 RINB1 TOUTB*1 TOUTB*2
7 8 22
SELECT A SELECT B
LOOPBACK
7 8 22
SELECT A SELECT B
LOOPBACK
ROUTA
ROUTA
TINA
TINA
ROUTB
ROUTB
TINB
TINB
14
GND
14 SP306
GND
SP306
RS-423 DRIVER * Tri-state output
RS-423 RECEIVER
RS-422 RECEIVER
RS-422 DRIVER * Tri-state output
Figure 4. Control Input Configuration -- SELECT A = 1, SELECT B = 1
ORDERING INFORMATION
Model Temperature Range Package Two full-duplex channels RS-422/RS-423 SP306CT ................................................ 0C to +70C ............................................................... 28-pin SOIC SP306MF .......................................... -55C to +125C ........................................... 28-pin Ceramic Flatpack
94
Corporation
SIGNAL PROCESSING EXCELLENCE


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