DS36954 Quad Differential Bus Transceiver General Description The DS36954 is a low power, quad EIA-485 differential bus transceiver especially suited for high speed, parallel, multipoint, I/O bus applications. A compact 20-pin surface mount PLCC or SOIC package provides high transceiver integration and a very small PC board footprint. Propagation delay skew between devices is specified to aid in parallel interface designs — limits on maximum and minimum delay times are guaranteed. for data bus connections. The fourth transceiver, with the flexibility provided by its individual enables, can serve as a control bus transceiver. Features Pinout for SCSI interface Compact 20-pin PLCC or SOIC package Meets EIA-485 standard for multipoint bus transmission Greater than 60 mA source/sink currents Thermal shutdown protection Glitch-free driver outputs on power up and down Five devices can implement a complete SCSI initiator or target interface. Three transceivers in a package are pinned out n n n n n n Connection Diagrams Logic Diagrams DS011014-1 Order Number DS36954V See NS Package Number V20A DS011014-2 DS011014-19 Order Number DS36954M See NS Package Number M20B TRI-STATE ® is a registered trademark of National Semiconductor Corporation. © 1999 National Semiconductor Corporation DS011014 www.national.com DS36954 Quad Differential Bus Transceiver July 1998 Absolute Maximum Ratings (Note 1) Derate M Package Storage Temperature Range Lead Temperature (Soldering 4 Sec.) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage 7V Control Input Voltage VCC + 0.5V Driver Input Voltage VCC + 0.5V Driver Output Voltage/ Receiver Input Voltage −10V to +15V Receiver Output Voltage 5.5V Continuous Power Dissipation @ +25˚C V Package 1.73W M Package 1.73W Derate V Package 13.9 mW/˚C above +25˚C 13.7 mW/˚C above +25˚C −65˚C to +150˚C 260˚C Recommended Operating Conditions Supply Voltage, VCC Bus Voltage Operating Free Air Temperature (TA) Min 4.75 −7 Max 5.25 +12 Units V V 0 +70 ˚C Electrical Characteristics (Note 2) Over Supply Voltage and Operating Temperature ranges, unless otherwise specified Symbol Parameter Conditions Min Typ Max Units DRIVER CHARACTERISTICS VODL VOD ∆IVODI VOC Differential Driver Output IL = 60 mA 1.5 1.9 V Voltage (Full Load) 2.0 2.25 V Voltage (Termination Load) VCM = 0V RL = 100Ω (EIA-422) RL = 54Ω (EIA-485) 1.5 2.0 V Change in Magnitude of Driver RL = 54 or 100Ω Differential Driver Output Differential Output Voltage for (Note 4) (Figure 1 ) 0.2 V Complementary Output States (EIA-422/485) RL = 54Ω (Figure 1 ) (EIA-485) 3.0 V Change in Magnitude of (Note 4) (Figure 1 ) 0.2 V Common Mode Output Voltage Driver Common Mode Output Voltage (Note 5) ∆IVOCI VOH Output Voltage High (EIA-422/485) IOH = −55 mA VOL Output Voltage Low IOL = 55 mA VIH Input Voltage High VIL Input Voltage Low VCL Input Clamp Voltage IIH Input High Current IIL Input Low Current IOSC Driver Short-Circuit 2.7 3.2 1.4 V 1.7 2.0 V V ICL = −18 mA VIN = 2.4V (Note 3) VIN = 0.4V (Note 3) 0.8 V −1.5 V 20 µA −20 µA mA −130 −250 Output Current VO = −7V (EIA-485) VO = 0V (EIA-422) −90 −150 mA (Note 9) VO = +12V (EIA-485) 130 250 mA −28 −75 mA 20 µA RECEIVER CHARACTERISTICS IOSR Short Circuit Output Current IOZ TRI-STATE ® Output Current VOH Output Voltage High VOL Output Voltage Low VO = 0V (Note 9) VO = 0.4V to 2.4V VID = 0.2V, IOH = 0.4 mA VID = −0.2V, IOL = 4 mA VTH Differential Input High VO = VOH, IO = −0.4 mA Threshold Voltage (EIA-422/485) VO = VOL, IO = 4.0 mA VTL Differential Input Low Threshold Voltage (Note 6) VHST Hysteresis (Note 7) (EIA-422/485) VCM = 0V −15 2.4 −0.20 35 3.0 V 0.35 0.5 V 0.03 0.2 V −0.03 V 60 mV DRIVER AND RECEIVER CHARACTERISTICS VIH Enable Input Voltage High VIL Enable Input Voltage Low www.national.com 2.0 V 0.8 2 V Electrical Characteristics (Note 2) (Continued) Over Supply Voltage and Operating Temperature ranges, unless otherwise specified Symbol Parameter Conditions Min Typ Max Units DRIVER AND RECEIVER CHARACTERISTICS VCL Enable Input Clamp Voltage IIN Line Input Current IING DE/RE = 0.8V DE4 = 0.8V Line Input Current Other Input = 0V DE/RE and DE4 = 2V VCC = 3.0V Enable Input TA = +25˚C VIN = 2.4V Current High DE/RE VIN = 2.4V IIL Enable Input DE4 or RE4 VIN = 0.8V Current Low DE/RE DE4 or RE4 Supply Current (Note 10) ICCR Supply Current (Note 10) V 1.0 mA −0.45 −0.8 mA VI = +12V 1.0 mA VI = −7V −0.8 mA VCC = 3.0V VCC = 4.75V VCC = 5.25V VCC = 3.0V 1 VCC = 5.25V VCC = 3.0V VCC = 4.75V 40 1 µA µA 1 40 µA 1 20 µA 1 20 µA −6 −40 −12 VCC = 5.25V VCC = 3.0V VCC = 5.25V VIN = 0.8V ICCD −1.5 0.5 VI = +12V VI = −7V (Note 8) (Note 8) IIH ICL = −18 mA Other Input = 0V µA µA −14 −40 µA −3 −20 µA −7 −20 µA 75 90 mA 50 70 mA No Load, DE/RE and DE4 = 2.0V No Load, DE/RE and RE4 = 0.8V Switching Characteristics Over Supply Voltage and Operating Temperature ranges, unless otherwise specified. Symbol Parameter Conditions Min Typ Max Units DRIVER SINGLE-ENDED CHARACTERISTICS RL = 110Ω tPZH Output Enable Time to High Level (Figure 5 ) 35 40 ns tPZL Output Enable Time to Low Level (Figure 6 ) 25 40 ns tPHZ Output Disable Time to High Level (Figure 5 ) 15 25 ns tPLZ Output Disable Time to Low Level (Figure 6 ) 35 40 ns DRIVER DIFFERENTIAL CHARACTERISTICS tr, tf Rise and Fall Time tPLHD Differential Propagation tPHLD Delays (Note 15) RL = 54Ω CL = 50 pF CD = 15 pF tSKD |tPLHD − tPHLD| Diff. Skew (Figures 3, 4, 9 ) 13 16 ns 9 15 19 ns 9 12 19 ns 3 6 ns RECEIVER CHARACTERISTICS tPLHD Differential Propagation Delays tPHLD CL = 15 pF VCM = 2.0V 9 14 19 ns 9 13 19 ns ns tSKD |tPLHD − tPHLD| Diff. Receiver Skew 3 Output Enable Time to High Level (Figure 7 ) CL = 15 pF 1 tPZH 15 22 ns tPZL Output Enable Time to Low Level (Figure 8 ) 20 30 ns tPHZ Output Disable Time from High Level 20 30 ns tPLZ Output Disable Time from Low Level 17 25 ns 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 defined 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 include driver input current and receiver TRI-STATE leakage current on DR(1–3). Note 4: ∆ IVODI and ∆ IVOCI are changes in magnitude of VOD and VOC, respectively, that occur when the input changes state. 3 www.national.com Switching Characteristics (Continued) 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 = V TH − 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 = +25˚C. Parameter Measurement Information DS011014-5 DS011014-3 FIGURE 3. Driver Differential Propagation Delay Load Circuit FIGURE 1. Driver VOD and VOC (Note 13) DS011014-4 FIGURE 2. Receiver VOH and VOL DS011014-6 FIGURE 4. Driver Differential Propagation Delays and Transition Times DS011014-8 DS011014-7 S1 to OA for DI = 3V S1 to OB for DI = 0V FIGURE 5. Driver Enable and Disable Timing (tPZH, tPHZ) www.national.com 4 Parameter Measurement Information (Continued) DS011014-10 DS011014-9 S1 to OA for DI = 0V S1 to OB for DI = 3V FIGURE 6. Driver Enable and Disable Timing (tPZL, tPLZ) DS011014-12 DS011014-11 FIGURE 7. Receiver Differential Propagation Delay Timing 5 www.national.com Parameter Measurement Information (Continued) DS011014-13 DS011014-14 S1 1.5V S2 Open S3 Closed DS011014-15 S1 −1.5V S2 Closed C3 Open DS011014-16 S1 1.5V S2 Closed C3 Closed DS011014-17 S1 −1.5V S2 Closed C3 Closed FIGURE 8. Receiver Enable and Disable Timing DS011014-18 Tra, Trb, Tfa and Tfb are propagation delay measurements to the 20% and 80% levels. TCP = Crossing Point FIGURE 9. Propagation Delay Timing for Calculations 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, trand tf < 6.0 ns, ZO = 50Ω. 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 (Figure 9) . www.national.com 6 Parameter Measurement Information (Continued) Note 16: On transceivers 1–3 the driver is loaded with receiver input conditions when DE/RE is high. Do not exceed the package power dissipation limit when testing. 7 www.national.com 8 Physical Dimensions inches (millimeters) unless otherwise noted Order Number DS36954M NS Package Number M20B Order Number DS36954V NS Package Number V20A 9 www.national.com DS36954 Quad Differential Bus Transceiver 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 OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component is any component of a life support 1. Life support devices or systems are devices or sysdevice or system whose failure to perform can be reatems which, (a) are intended for surgical implant into sonably expected to cause the failure of the life support the body, or (b) support or sustain life, and whose faildevice or system, or to affect its safety or effectiveness. ure 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. 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