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. 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 Six devices can implement a complete IPI master or slave interface. Three transceivers in a package are pinned out for Pinout and Logic Diagram 01060201 Order Number DS36950 See NS Package Number V20A 01060202 TRI-STATE ® is a registered trademark of National Semiconductor Corporation. © 2004 National Semiconductor Corporation DS010602 www.national.com DS36950 Quad Differential Bus Transceiver July 1998 DS36950 Absolute Maximum Ratings (Note 1) Derate V Package 13.9 mW/˚C above 25˚C Storage Temp. Range 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 260˚C Recommended Operating Conditions Supply Voltage, VCC Driver Output Voltage/Receiver Input Voltage −65˚C to +150˚C Lead Temp. (Soldering 4 Sec.) −10V to +15V Receiver Output Voltage 5.5V Continuous Power Dissipation @ 25˚C V Package 4.75V to 5.25V Bus Voltage −7V to +12V Operating Free Air Temp. (TA) 0˚C to +70˚C 1.73W Electrical Characteristics (Note 2) Over Supply Voltage and Operating Temperature ranges, unless otherwise specified Symbol Parameter Conditions Min Typ Max Units 1.5 1.9 V DRIVER CHARACTERISTICS VODL VOD ∆IVODI VOC ∆IVOCI Differential Driver Output IL = 60 mA Voltage (Full Load) VCM = 0V Differential Driver Output RL = 100Ω (EIA-422) 2.0 3.5 V Voltage (Termination Load) RL = 54Ω (EIA-485) 1.5 3.2 V Change in Magnitude of Driver RL = 54Ω or 100Ω Differential Output Voltage for (Note 4) (Figure 1) Complementary Output States (EIA-485) Driver Common Mode Output RL = 54Ω Voltage (Note 5) (Figure 1) (EIA-485) Change in Magnitude of Common (Note 4) (Figure 1) Mode Output Voltage (EIA-485) VOH Output Voltage HIGH IOH = −55 mA VOL Output Voltage LOW IOL = 55 mA VIH Input Voltage HIGH 2.7 0.2 V 3.0 V 0.2 V 3.2 1.4 V 1.7 2.0 V V VIL Input Voltage LOW VCL Input Clamp Voltage I = −18 mA IIH Input High Current VI = 2.4V (Note 3) IIL Input Low Current VI = 0.4V (Note 3) −20 µA IOSC Driver Short-Circuit VO = −7V (EIA-485) −130 −250 mA Output Current VO = 0V (EIA-422) −90 −150 mA (Note 9) VO = +12V (EIA-485) 130 250 mA −28 −75 mA 20 µA 0.8 V −1.5 V 20 µA RECEIVER CHARACTERISTICS IOSR Short Circuit Output Current VO = 0V (Note 9) IOZ TRI-STATE ® Output Current VO = 0.4V to 2.4V −15 VOH Output Voltage High VID = 0.20V, IOH = −0.4 mA VOL Output Voltage Low VID = −0.20V, IOL = 4 mA 0.35 0.5 V VTH Differential Input High VO = VOH, IO = −0.4 mA 0.03 0.20 V Threshold Voltage (EIA-422/485) VTL VHST Differential Input Low VO = VOL, IO = 4.0 mA Threshold Voltage (Note 6) (EIA-422/485) Hysteresis (Note 7) VCM = 0V 2.4 3.0 V −0.20 −0.03 V 35 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 (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 I = −18 mA IIN Line Input Current Other Input = 0V (Note 8) IIH Enable Input Current High IIL VOH = 2.4V Enable Input Current Low VOL = 0.4V −1.5 V VI = +12V 0.5 1 mA VI = −7V −0.45 −0.8 mA RE4 or DE 20 µA REC 60 µA RE4 or DE −20 µA REC −60 µA ICC Supply Current (Note 10) No Load, Outputs Enabled 75 90 mA ICCZ Supply Current (Note 10) No Load, Outputs Disabled 50 70 mA Switching Characteristics Over Supply Voltage and Operating Temperature ranges, unless otherwise specified Symbol Conditions Min Typ Max Units DRIVER SINGLE-ENDED CHARACTERISTICS tPZH RL = 110Ω (Figure 4) 35 40 ns tPZL RL = 110Ω (Figure 5) 25 40 ns tPHZ RL = 110Ω (Figure 4) 15 25 ns tPLZ RL = 110Ω (Figure 5) 35 40 ns DRIVER DIFFERENTIAL CHARACTERISTICS t R , tF Rise & Fall Time RL = 54Ω 13 16 ns tPLHD Differential Propagation CL = 50 pF 9 15 19 ns tPHLD Delays (Note 15) CD = 15 pF 9 15 19 ns tSKD |tPLHD − tPHLD| Differential Skew (Figures 3, 8) 3 6 ns RECEIVER CHARACTERISTICS tPLHD Differential Propagation Delays 9 14 19 ns tPHLD CL = 15 pF, VCM = 1.5V (Figure 6) 9 14 19 ns tSKD |tPLHD − tPHLD| Differential Receiver Skew 1 3 ns tZH Output Enable Time to High Level 15 22 ns tZL Output Enable Time to Low Level CL = 15 pF 20 30 ns tHZ Output Disable Time from High Level (Figure 7) tLZ Output Disable Time from Low Level 10 17 ns 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 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 = 25˚C. 3 www.national.com DS36950 Electrical Characteristics (Note 2) 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 = 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 (See Figure 8). Typical Performance Characteristics Driver Differential Propagation Delay vs Temperature Driver Differential Propagation Delay vs VCC 01060223 www.national.com 01060224 8 DS36950 Typical Performance Characteristics (Continued) Driver Transition Time vs Temperature Driver Transition Time vs VCC 01060225 01060227 Driver VOH vs IOH vs VCC Driver VOH vs IOH vs Temperature 01060226 01060228 Driver VOL vs IOL vs VCC Driver VOL vs IOL vs Temperature 01060229 01060230 9 www.national.com DS36950 Typical Performance Characteristics (Continued) Driver VOD vs IO vs Temperature 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 VCC Receiver VOH vs IOH vs Temperature 01060235 www.national.com 01060236 10 DS36950 Typical Performance Characteristics (Continued) Receiver VOL vs IOL vs Temperature 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. 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