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| DS36950 Quad Differential Bus Transceiver July 1998 DS36950 Quad Differential Bus Transceiver General Description The DS36950 is a low power, space-saving quad EIA-485 differential bus transceiver especially suited for high speed, parallel, multipoint, computer I/O bus applications. A compact 20-pin surface mount PLCC package provides high transceiver integration and a very small PC board footprint. Timing uncertainty across an interface using multiple devices, a typical problem in a parallel interface, is specified -- minimum and maximum propagation delay times are guaranteed. Six devices can implement a complete IPI master or slave interface. Three transceivers in a package are pinned out for connection to a parallel databus. The fourth transceiver, with the flexibility provided by its individual enables, can serve as a control bus transceiver. Features n n n n n Pinout for IPI interface Compact 20-pin PLCC package Meets EIA-485 standard for multipoint bus transmission Greater than 60 mA source/sink Thermal Shutdown Protection Pinout and Logic Diagram 01060201 Order Number DS36950 See NS Package Number V20A 01060202 TRI-STATE (R) is a registered trademark of National Semiconductor Corporation. (c) 2004 National Semiconductor Corporation DS010602 www.national.com DS36950 Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Control Input Voltage Driver Input Voltage Driver Output Voltage/Receiver Input Voltage Receiver Output Voltage Continuous Power Dissipation @ 25C V Package -10V to +15V 5.5V 7V VCC + 0.5V VCC + 0.5V Derate V Package 13.9 mW/C above 25C Storage Temp. Range Lead Temp. (Soldering 4 Sec.) -65C to +150C 260C Recommended Operating Conditions Supply Voltage, VCC Bus Voltage Operating Free Air Temp. (TA) 4.75V to 5.25V -7V to +12V 0C to +70C 1.73W Electrical Characteristics (Note 2) Over Supply Voltage and Operating Temperature ranges, unless otherwise specified Symbol VODL VOD IVODI Parameter Differential Driver Output Voltage (Full Load) Differential Driver Output Voltage (Termination Load) Change in Magnitude of Driver Differential Output Voltage for Complementary Output States VOC IVOCI VOH VOL VIH VIL VCL IIH IIL IOSC Driver Common Mode Output Voltage (Note 5) Change in Magnitude of Common Mode Output Voltage Output Voltage HIGH Output Voltage LOW Input Voltage HIGH Input Voltage LOW Input Clamp Voltage Input High Current Input Low Current Driver Short-Circuit Output Current (Note 9) RECEIVER CHARACTERISTICS IOSR IOZ VOH VOL VTH VTL VHST VIH VIL Short Circuit Output Current TRI-STATE (R) Output Current Output Voltage High Output Voltage Low Differential Input High Threshold Voltage Differential Input Low Threshold Voltage (Note 6) Hysteresis (Note 7) Enable Input Voltage High Enable Input Voltage Low DRIVER AND RECEIVER CHARACTERISTICS 2.0 0.8 V V VO = 0V (Note 9) VO = 0.4V to 2.4V VID = 0.20V, IOH = -0.4 mA VID = -0.20V, IOL = 4 mA VO = VOH, IO = -0.4 mA (EIA-422/485) VO = VOL, IO = 4.0 mA (EIA-422/485) VCM = 0V 35 60 mV -0.20 -0.03 V 2.4 3.0 0.35 0.03 0.5 0.20 -15 -28 -75 20 mA A V V V I = -18 mA VI = 2.4V (Note 3) VI = 0.4V (Note 3) VO = -7V VO = 0V VO = +12V (EIA-485) (EIA-422) (EIA-485) -130 -90 130 IL = 60 mA VCM = 0V RL = 100 (EIA-422) RL = 54 (EIA-485) RL = 54 or 100 (Note 4) (Figure 1) (EIA-485) RL = 54 (Figure 1) (EIA-485) (Note 4) (Figure 1) (EIA-485) IOH = -55 mA IOL = 55 mA 2.0 0.8 -1.5 20 -20 -250 -150 250 2.7 3.2 1.4 1.7 V V V V V A A mA mA mA 0.2 V 3.0 V 0.2 V 2.0 1.5 3.5 3.2 V V Conditions Min 1.5 Typ 1.9 Max Units V DRIVER CHARACTERISTICS www.national.com 2 DS36950 Electrical Characteristics (Note 2) Symbol VCL IIN IIH IIL ICC ICCZ Parameter Enable Input Clamp Voltage Line Input Current (Note 8) Enable Input Current High Enable Input Current Low Supply Current (Note 10) Supply Current (Note 10) DRIVER AND RECEIVER CHARACTERISTICS (Continued) Over Supply Voltage and Operating Temperature ranges, unless otherwise specified Conditions I = -18 mA Other Input = 0V VOH = 2.4V VOL = 0.4V VI = +12V VI = -7V RE4 or DE REC RE4 or DE REC No Load, Outputs Enabled No Load, Outputs Disabled 75 50 0.5 -0.45 Min Typ Max -1.5 1 -0.8 20 60 -20 -60 90 70 Units V mA mA A A A A mA mA Switching Characteristics Over Supply Voltage and Operating Temperature ranges, unless otherwise specified Symbol tPZH tPZL tPHZ tPLZ t R , tF tPLHD tPHLD tSKD tPLHD tPHLD tSKD tZH tZL tHZ tLZ RL = 110 (Figure 4) RL = 110 (Figure 5) RL = 110 (Figure 4) RL = 110 (Figure 5) Rise & Fall Time Differential Propagation Delays (Note 15) |tPLHD - tPHLD| Differential Skew Differential Propagation Delays CL = 15 pF, VCM = 1.5V (Figure 6) |tPLHD - tPHLD| Differential Receiver Skew Output Enable Time to High Level Output Enable Time to Low Level Output Disable Time from High Level Output Disable Time from Low Level CL = 15 pF (Figure 7) RL = 54 CL = 50 pF CD = 15 pF (Figures 3, 8) 9 9 9 9 Conditions Min Typ 35 25 15 35 13 15 15 3 14 14 1 15 20 10 17 Max 40 40 25 40 16 19 19 6 19 19 3 22 30 17 25 Units ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns DRIVER SINGLE-ENDED CHARACTERISTICS DRIVER DIFFERENTIAL CHARACTERISTICS RECEIVER CHARACTERISTICS Note 1: "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices should be operated at these limits. The tables of "Electrical Characteristics" specify conditions for device operation. Note 2: Current into device pins is define as positive. Current out of device pins is defined as negative. All voltages are referenced to ground unless otherwise specified. Note 3: IIH and IIL includes driver input current and receiver TRI-STATE leakage current. Note 4: IVODI and IVOCI are changes in magnitude of VOD and VOC, respectively, that occur when the input changes state. Note 5: In EIA Standards EIA-422 and EIA-485, VOC, which is the average of the two output voltages with respect to ground, is called output offset voltage, VOS. Note 6: Threshold parameter limits specified as an algebraic value rather than by magnitude. Note 7: Hysteresis defined as VHST = VTH - VTL. Note 8: IIN includes the receiver input current and driver TRI-STATE leakage current. Note 9: Short one output at a time. Note 10: Total package supply current. Note 11: All typicals are given for VCC = 5.0V and TA = 25C. 3 www.national.com DS36950 Parameter Measurement Information 01060203 FIGURE 1. Driver VOD and VOC 01060204 FIGURE 2. Receiver VOH and VOL 01060205 01060206 FIGURE 3. Driver Differential Propagation Delay and Transition Timing www.national.com 4 DS36950 Parameter Measurement Information (Continued) 01060209 S1 to OA for DI = 3V S1 to OB for DI = 0V 01060210 FIGURE 4. Driver Enable and Disable Timing (tPZH, tPHZ) 01060211 S1 to OA for DI = 0V S1 to OB for DI = 3V 01060212 FIGURE 5. Driver Enable and Disable Timing (tPZL, tPLZ) 5 www.national.com DS36950 Parameter Measurement Information (Continued) 01060213 01060214 FIGURE 6. Receiver Differential Propagation Delay Timing www.national.com 6 DS36950 Parameter Measurement Information (Continued) 01060215 01060216 S1 1.5V S2 OPEN S3 CLOSED 01060217 S1 -1.5V S2 CLOSED S3 OPEN 01060218 S1 1.5V S2 CLOSED S3 CLOSED 01060219 S1 -1.5V S2 CLOSED S3 CLOSED FIGURE 7. Receiver Enable and Disable Timing 7 www.national.com DS36950 Parameter Measurement Information (Continued) 01060220 TCP = Crossing Point Tra, Trb, Tfa, and Tfb are propagation delay measurements to the 20% and 80% levels. FIGURE 8. Propagation Delay Timing for Calculation of Driver Differential Propagation Delays Note 12: The input pulse is supplied by a generator having the following characteristics: f = 1.0 MHz, 50% Duty Cycle, tf and tr < 6.0 ns, ZO = 50 Note 13: CL includes probe and stray capacitance. Note 14: Diodes are 1N916 or equivalent. Note 15: Differential propagation delays are calculated from single-ended propagation delays measured from driver input to the 20% and 80% levels on the driver outputs (See Figure 8). Typical Performance Characteristics Driver Differential Propagation Delay vs Temperature Driver Differential Propagation Delay vs VCC 01060223 01060224 www.national.com 8 DS36950 Typical Performance Characteristics Driver Transition Time vs Temperature (Continued) Driver Transition Time vs VCC 01060225 01060227 Driver VOH vs IOH vs Temperature Driver VOH vs IOH vs VCC 01060226 01060228 Driver VOL vs IOL vs Temperature Driver VOL vs IOL vs VCC 01060229 01060230 9 www.national.com DS36950 Typical Performance Characteristics Driver VOD vs IO vs Temperature (Continued) Driver VOD vs IO vs VCC 01060231 01060232 Receiver Differential Propagation Delay vs Temperature Receiver Differential Propagation Delay vs VCC 01060233 01060234 Receiver VOH vs IOH vs Temperature Receiver VOH vs IOH vs VCC 01060235 01060236 www.national.com 10 DS36950 Typical Performance Characteristics Receiver VOL vs IOL vs Temperature (Continued) Receiver VOL vs IOL vs VCC 01060237 01060238 Supply Current vs Temperature Power Supply Current vs Power Supply Voltage 01060239 01060240 Driver ICC vs Switching Frequency 01060241 11 www.national.com DS36950 Quad Differential Bus Transceiver Physical Dimensions inches (millimeters) unless otherwise noted Order Number DS36950 NS Package Number V20A National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For the most current product information visit us at www.national.com. LIFE SUPPORT POLICY NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ``Banned Substances'' as defined in CSP-9-111S2. National Semiconductor Americas Customer Support Center Email: new.feedback@nsc.com Tel: 1-800-272-9959 www.national.com National Semiconductor Europe Customer Support Center Fax: +49 (0) 180-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Francais Tel: +33 (0) 1 41 91 8790 National Semiconductor Asia Pacific Customer Support Center Email: ap.support@nsc.com National Semiconductor Japan Customer Support Center Fax: 81-3-5639-7507 Email: jpn.feedback@nsc.com Tel: 81-3-5639-7560 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. |
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