SP334 SP334. Programmable RS-232/RS-485 Transceiver. Description. Typical Applications Circuit
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1 Programmable / Transceiver Description The SP334 is a programmable and/or transceiver IC. The SP334 contains three drivers and five receivers when selected in mode; and two drivers and two receivers when selected in mode. The transceivers can typically operate at 30kbps while adhering to the specifications. The transceivers can operate up to 10Mbps while adhering to the specifications. The drivers can be disabled (High-Z output) by the TXEN enable pin. The and receiver outputs can be disabled by the RXEN pin. FEATURES 5V Single Supply Operation Software Programmable or Selection Three Drivers and Five Receivers in Mode Two Full-Duplex Transceivers in Mode Full Differential Driver Tri-State (Hi-Z) Control Receiver Output Tri-State Control Ordering Information - Back Page Typical Applications Circuit 5V C1 C1- C C- 5 VCC SP334 V V TXEN TI1 TI3 RX1 T1 T3 R1 1 1 TX TX1 TX4 TX3 RI1 RI RX3 RXEN R3 1 1 RI4 RI3 RS3/ RS V 1/13
2 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 V to (V CC 0.5V) Drivers V to (V CC 0.5V) 100mA Driver Outputs...±15V Maximum Data Rate... 8Mbps (1) Storage Temperature C to 150 C Power Dissipation Package Derating 8-pin WSOIC mW 8-pin WSOIC Ѳ JA C/W NOTE: 1. Exceeding the maximum data rate of 8Mbps at T A = 85 C may permanently damage the device. Electrical Characteristics Limits are specified at T A = 5 C and V CC = 5. unless otherwise noted. PARAMETER MIN. TYP. MAX. UNITS CONDITIONS Logic Inputs V IL 0.8 V V IH.0 V Logic Outputs V OL 0.4 V I OUT = -3.mA V OH.4 V I OUT = 1.0mA Output Tri-state Leakage 10 µa 0.4V V OUT.4V Driver DC Characteristics HIGH Level Output V R L = 3kΩ, V IN = 0.8V LOW Level Output V R L = 3kΩ, V IN =. Open Circuit Voltage V Short Circuit Current ±100 ma V OUT = Power Off Impedance 300 Ω V CC =, V OUT = ±. AC Characteristics Slew Rate 30 V/µs R L = 3kΩ, C L = 50pF; V CC = 5., T 5 C Transistion Time 1.56 µs R L = 3kΩ, C L = 500pF; between ±3V, T 5 C Maximum Data Rate kbps R L = 3kΩ, C L = 500pF Propagation Delay t PHL 8 µs Measured from 1.5V of V IN to 50% of V OUT ; Propagation Delay t PLH 8 µs R L = 3kΩ Receiver DC Characteristics HIGH Threshold V LOW Threshold V Receiver Open Circuit Bias.0 V Input Impedance kω V IN = 15V to -15V /13
3 Electrical Characteristics (Continued) Limits are specified at T A = 5 C and V CC = 5. unless otherwise noted. PARAMETER MIN. TYP. MAX. UNITS CONDITIONS Receiver (Continued) AC Characteristics Maximum Data Rate kbps Propagation Delay t PHL µs Propagation Delay t PLH µs Driver DC Characteristics Open Circuit Voltage 6.0 V Differential Output V R L = 54Ω, C L = 50pF Balance ±0. V V T - V T Common-Mode Output 3.0 V Output Current 8.0 ma R L = 54Ω Measured from 50% of V IN to 1.5V of V OUT Short Circuit Current ±50 ma Terminated in -7V to 1 AC Characteristics Maximum Data Rate 10 Mbps R L = 54Ω Maximum Data Rate 8 Mbps R L = 54Ω, T A = 85 C (1) Output Transition Time 30 ns Rise/Fall time, 10% - 90% Propagation Delay t PHL ns See Figures 3 & 5, R DIFF = 54Ω, Propagation Delay t PLH ns C L1 = C L = 100pF Driver Output Skew 5 0 ns Per Figure 5, t SKEW = t DPHL - t DPLH Enable Timing Enable Time (see Figures 4 and 6) Enable to LOW ns C L = 15pF, S 1 Closed Enable to HIGH ns C L = 15pF, S Closed Disable Time (see Figures 4 and 6) Disable from LOW ns C L = 15pF, S 1 Closed Disable from HIGH ns C L = 15pF, S Closed Receiver DC Characteristics Common Mode Range V Receiver Sensitivity ±0. V -7V V CM 1V Input Impedance 1 15 kω -7V V CM 1V AC Characteristics Maximum Data Rate 10 Mbps Maximum Data Rate 8 Mbps T A = 85 C (1) Propagation Delay t PHL ns See Figures 3 & 7, R DIFF = 54Ω, Propagation Delay t PLH ns C L1 = C L = 100pF Differential Receiver Skew 10 0 ns t SKEW = t PHL - t PLH, R DIFF = 54Ω, C L1 = C L = 100pF, see Figure 8 3/13
4 Electrical Characteristics, Continued Limits are specified at T A = 5 C and V CC = 5. unless otherwise noted. PARAMETER MIN. TYP. MAX. UNITS CONDITIONS Receiver (Continued) Enable Timing Enable Time (see Figures and 8) Enable to LOW ns C L = 15pF, S 1 Closed Enable to HIGH ns C L = 15pF, S Closed Disable Time (see Figures and 8) Disable from LOW ns C L = 15pF, S 1 Closed Disable from HIGH ns C L = 15pF, S Closed Power Requirements Supply Voltage V CC V Supply Current I CC No Load (T X Disabled) 1 0 ma TXEN = No Load ( Mode) 0 50 ma RS3/RS485 = No Load ( Mode) ma RS3/RS485 = 5V Environmental Operating Temperature Commercial (_C_) 0 70 ºC Industrial (_E_) ºC Storage Temperature ºC NOTE: 1. Exceeding the maximum data rate of 8Mbps at T A = 85 C may permanently damage the device. 4/13
5 Receiver Input Graph RECEIVER 1.0mA -7V -3V 6V 1V -0.6mA 1 Unit Load Maximum Input Current Versus Voltage Test Circuits R Receiver Test Point Output S 1 1kΩ V CC D V OD C RL 1kΩ R V OC S Figure 1. Driver DC Test Load Circuit Figure. Receiver Timing Test Load Circuit DI A B R L C L1 C L A B RO 15pF Output Under Test C L 500Ω S 1 V CC S Figure 3. Driver / Receiver Timing Test Circuit Figure 4. Driver Timing Test Load # Circuit 5/13
6 Switching Waveforms DRIVER INPUT DRIVER OUTPUT DIFFERENTIAL OUTPUT V A V B 3V B A V O V O V O 1/V O f 1MHz; t R 10ns; t F 10ns 1.5V 1.5V t PLH t PHL t DPLH t DPHL t R t F 1/V O t SKEW = t DPLH - t DPHL Figure 5. Driver Propagation Delays 3V TXEN 5V A, B.3V V OL f = 1MHz; t R < 10ns; t F < 10ns 1.5V 1.5V t ZL t LZ Output normally LOW 0.5V A, B V OH.3V t ZH Output normally HIGH 0.5V t HZ Figure 6. Driver Enable and Disable Times f = 1MHz; t R 10ns; t V F 10ns OD A B V INPUT OD V OH RECEIVER OUT 1.5V OUTPUT 1.5V V OL t PHL t PLH Figure 7. Receiver Propagation Delays 6/13
7 Switching Waveforms (Continued) 3V RXEN 5V RECEIVER OUT 1.5V V IL 1.5V f = 1MHz; t 1.5V R 10ns; t F 10ns t ZL t LZ Output normally LOW 0.5V V IH RECEIVER OUT 1.5V t ZH Output normally HIGH 0.5V t HZ t SKEW = t PHL - t PLH Figure 8. Receiver Enable and Disable Times TTL Input TTL INPUT Driver Output A Driver Output B DRIVER OUTPUT Differential Output VA - VB Figure 9. Typical Driver Output Figure 10. Typical Driver Output 7/13
8 8/13 Typical Operating Circuits Figure 1. Typical Operating Circuits Pinout Figure 11. SP334 Pinout TI3 TXEN(n/c) TX4(n/c) TX3 VCC TX1 TX C1 V C C1 C V TI TI1 RXEN RS3/RS485 RI5 RX5 RX4 RX3 RX RX1 RI4 RI3 RI RI SP334 (in Mode) 5V VCC V V- RXEN T1 T T3 TX1 TX TX3 TI1 TI TI3 RI1 RI RI3 RI4 RX1 RX RX3 RX C1 C1- C C RS3/RS R1 R R3 R4 SP334 C1 C1- C C- 5V VCC T1 T3 R1 V V- 5V RS3/ RS RI RI1 TX3 TX4 TX1 TX TI1 TI3 RX1 1 R RI4 RI3 RX3 RXEN 1 SP TXEN 3 4 N/C N/C R5 RI5 4 RX5 3
9 Theory of Operation The SP334 is made up of four separate circuit blocks: the charge pump, drivers, receivers, and decoder. Each of these circuit blocks is described in more detail below. Charge-Pump The charge pump is an Exarpatented design (U.S. 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 1 power supplies. Figure 17(a) shows the waveform found on the positive side of capacitor C, and Figure 17(b) shows the negative side of capacitor C. There is a freerunning oscillator that controls the four phases of the voltage shifting. A description of each phase follows. Phase 1: V SS Charge Storage During this phase of the clock cycle, the positive side of capacitors C 1 and C are initially charged to 5V. C 1 is then switched to ground and charge on C 1 is transferred to C. Since C is connected to 5V, the voltage potential across capacitor C is now 1. Phase : V SS Transfer Phase two of the clock connects the negative terminal of C to the V SS storage capacitor and the positive terminal of C to ground, and transfers the generated -1 to C 3. Simultaneously, the positive side of capacitor C 1 is switched to 5V and the negative side is connected to ground. Phase 3: V DD Charge Storage The third phase of the clock is identical to the first phase; the charge transferred in C 1 produces -5V in the negative terminal of C 1, which is applied to the negative side of capacitor C. Since C is at 5V, the voltage potential across C is 1. Phase 4: V DD Transfer The fourth phase of the clock connects the negative terminal of C to ground and transfers the generated 1 across C to C 4, the V DD storage capacitor. Again, simultaneously with this, the positive side of capacitor C 1 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 V CC in a noload 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 with a 16V breakdown rating. External Power Supplies For applications that do not require 5V only, external supplies can be applied at the V and V pins. The value of the external supply voltages must be no greater than ±1. The current drain for the ±1 supplies is used for. For the driver the current requirement will be 3.5mA per driver. The external power supplies should provide a power supply sequence of :1, then 5V, followed by -1. V CC = 5V 5V C 1 C 5V 5V C 4 C 3 Figure 13. Charge Pump Phase 1 V CC = 5V C 1 C 1 Figure 14. Charge Pump Phase V CC = 5V 5V C 1 C 5V 5V C 4 C 3 Figure 15. Charge Pump Phase 3 V CC = 5V C 1 C 1 C 4 C 3 C 4 C 3 V DD Storage Capacitor V SS Storage Capacitor V DD Storage Capacitor V SS Storage Capacitor V DD Storage Capacitor V SS Storage Capacitor V DD Storage Capacitor V SS Storage Capacitor Figure 16. Charge Pump Phase 4 9/13
10 1 a) C b) C- -1 Figure 17. Charge Pump Waveforms Drivers The SP334 has three independent single-ended drivers and two differential drivers. Control for the mode selection is done by the RS3/RS485 select pin. The drivers are pre-arranged such that for each mode of operation the relative position and functionality of the drivers are set up to accommodate the selected interface mode. As the mode of the drivers is changed, the electrical characteristics will change to support the requirements of clock, data, and control line signal levels. Unused driver inputs can be left floating; however, to ensure a desired state with no input signal, pullup resistors to 5V or pull down resistors to ground are suggested. Since the driver inputs are both TTL or CMOS compatible, any value resistor less than 100kΩ will suffice. When in mode, the single-ended drivers produce compliant E and ITU V.8 signals. Each of the three drivers output single-ended bipolar signals in excess of ±5V with a full load of 3kΩ and 500pF applied as specified. These drivers can also operate at least 10kbps. When programmed to mode, the differential drivers produce complaint signals. Each driver outputs a unipolar signal on each output pin with a magnitude of at least 1.5V while loaded with a worst case of 54Ω between the driver s two output pins. The signal levels and drive capability of the drivers allow the drivers to also comply with RS-4 levels. The transmission rate for the differential drivers is 10Mbps. Receivers The SP334 has five single-ended receivers when programmed for mode and two differential receivers when programmed for mode. Control for the mode selection is done the same select pin as in the drivers. As the operating mode of the receivers is changed, the electrical characteristics will change to support the requirements of the appropriate serial standard. Unused receiver inputs can be left floating without causing oscillation. To ensure a desired state of the receiver output, a pullup resistor of 100kΩ to 5V should be connected to the inverting input for a logic low, or the noninverting input for a logic high. For single-ended receivers, a pulldown resistor to ground of 5kΩ is internally connected, which will ensure a logic high output. The receiver has a singleended input with a threshold of 0.8V to.4v. The receiver has an operating voltage range of ±15V and can receive signals up to 10kbps. receivers are used in mode for all signal types include data, clock, and control lines of the serial port. The differential receiver has an input impedance of 15kΩ and a differential threshold of ±00mV. Since the characteristics of an RS-4 receiver are actually subsets of, the receivers for RS-4 requirements are identical to the receivers. All of the differential receivers can receive data up to 10Mbps. 10/13
11 Enable Pins The SP334 drivers can be enabled by use of the TXEN pin. A logic HIGH will enable the driver outputs and a logic LOW will tri-state the outputs. The drivers can only be tri-stated in mode. The drivers are always active in mode. The Receiver outputs can also be tri-stated by the use of the RXEN pin. A logic LOW will enable the receiver outputs and a logic HIGH will tri-state the outputs. The receiver tri-state capability is offered for both and modes. The input impedance of the receivers during tri-state is at least 1kΩ. Applications The SP334 allows the user flexibility in having a or serial port without using two different discrete active IC s. Figure 18 shows a connection to a standard DB-9 connector. In mode, the SP334 is a full duplex transceiver, however, a half duplex configuration can be made by connecting the driver outputs to receiver inputs. 5V 9 C1 1 C1-11 C 13 C- 5 VCC SP334 V V RS3/RS485 TxD 7 TI1 T1 TX1 6 RTS DTR 8 TI 1 TI3 T T3 TX TX DCD DSR RxD 6 RxD CTS DSR DCD RI 19 RX1 0 RX 1 RX3 RX4 3 RX5 R1 R R3 R4 R5 RI1 15 RI 16 RI3 17 RI4 18 RI5 4 RTS TxD CTS DTR RI SG RXEN 6 Figure 18. SP334 Configuration to a DB-9 Serial Port 11/13
12 Mechanical Dimensions WSOIC8 Top View Side View Front View Drawing No: POD Revision: B 1/13
13 Ordering Information (1) Part Number Operating Temperature Range Lead-Free Package Packaging Method SP334CT-L SP334CT-L/TR SP334ET-L SP334ET-L/TR 0 C to 70 C -40 C to 85 C Yes () 8-pin WSOIC Tube Reel Tube Reel NOTE: 1. Refer to for most up-to-date Ordering Information.. Visit for additional information on Environmental Rating. Revision History Revision Date Description 000 SP334/10 Legacy Sipex Datasheet 09/09/ /19/ Convert to Exar Format. Add typical application circuit to page 1 and Revision History table. Remove EOL part numbers and update ordering information per PDN Change revision to Add Maximum Data Rate to Absolute Maximum Ratings. Add Driver and Receiver data rate column for 8Mbps maximum at Tmax and add Note 1. Update to MaxLinear logo. Update format and ordering information table. Enable Timing moved on page 3. Corporate Headquarters: 5966 La Place Court Suite 100 Carlsbad, CA 9008 Tel.:1 (760) Fax: 1 (760) High Performance Analog: 1060 Rincon Circle San Jose, CA Tel.: 1 (669) Fax: 1 (669) serialtechsupport@exar.com The content of this document is furnished for informational use only, is subject to change without notice, and should not be construed as a commitment by MaxLinear, Inc.. MaxLinear, Inc. assumes no responsibility or liability for any errors or inaccuracies that may appear in the informational content contained in this guide. Complying with all applicable copyright laws is the responsibility of the user. Without limiting the rights under copyright, no part of this document may be reproduced into, stored in, or introduced into a retrieval system, or transmitted in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise), or for any purpose, without the express written permission of MaxLinear, Inc. Maxlinear, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless MaxLinear, Inc. receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of MaxLinear, Inc. is adequately protected under the circumstances. MaxLinear, Inc. may have patents, patent applications, trademarks, copyrights, or other intellectual property rights covering subject matter in this document. Except as expressly provided in any written license agreement from MaxLinear, Inc., the furnishing of this document does not give you any license to these patents, trademarks, copyrights, or other intellectual property. Company and product names may be registered trademarks or trademarks of the respective owners with which they are associated MaxLinear, Inc. All rights reserved SP334_DS_ /13
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