DS36276M/NOPB

DS36276_11 TI1 | Alldatasheet

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DS36276 FAILSAFE Multipoint Transceiver Literature Number: SNLS085A

FAILSAFE Multipoint Transceiver General Description The DS36276 FAILSAFE Multipoint Transceiver is designed for use on bi-directional differential busses. It is compatible with existing TIA/EIA-485 transceivers, however, it offers an additional feature not supported by standard transceivers. The FAILSAFE feature guarantees the receiver output to a known state when the Interface is in the following conditions: Floating Line, Idle Line (no active drivers), and Line Fault conditions (open or short). The receiver output is in a HIGH state for the following conditions: OPEN Inputs, Terminated Inputs (50Ω ), and SHORTED Inputs. FAILSAFE is a highly desirable feature when the transceiv- ers are used with Asynchronous Controllers such as UARTs.

Features

n FAILSAFE receiver, RO = HIGH for: — OPEN inputs — Terminated inputs — SHORTED inputs n Compatible with popular interface standards: — TIA/EIA-485 (RS-485) — TIA/EIA-422-A (RS-422-A) — CCITT Recommendation V.11 n Bi-Directional Transceiver — Designed for multipoint transmission n Separate driver input, driver enable, receiver enable, and receiver output for maximum flexibility n Wide bus common mode range — (−7V to +12V) n Pin compatible with: DS75176B, DS96176, DS3695 and SN75176A and B n Available in SOIC package Connection and Logic Diagram Driver Inputs Outputs RE DE DI DO/RI DO /RI XHH H L XHL L H XLX Z Z Receiver Inputs Output RE DE RI–RI RO LL ≥0V H LL ≤−500 mV L HX X Z Receiver FAILSAFE Inputs Output RE DE RI–RI RO L L SHORTED H L L OPEN H HX X ZTRI-STATE® is a registered trademark of National Semiconductor Corporation. DS011383-1 Order Number DS36276M See NS Package Number M08A July 1998 DS36276 FAILSAFE Multipoint Transceiver © 2001 National Semiconductor Corporation DS011383 www.national.com

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 (V CC )7 V Input Voltage (DE, RE , and DI) 5.5V Driver Output Voltage/ Receiver Input Voltage −10V to +15V Receiver Output Voltage (RO) 5.5V Maximum Package Power Dissipation @ +25˚C M Package (derate 5.8 mW/˚C above +25˚C) 726 mW Storage Temperature Range −65˚C to +150˚C Lead Temperature (Soldering 4 sec.) 260˚C Max Junction Temperature 150˚C ESD Rating (HBM, 1.5 kΩ , 100 pF) ≥ 6.0 kV Recommended Operating Conditions Min Max Units Supply Voltage, VCC 4.75 5.25 V Bus Voltage −7 +12 V Operating Temperature (T DS36276 0 +70 ˚C Electrical Characteristics(Notes 2, 4) Over recommended Supply Voltage and Operating Temperature ranges, unless otherwise specified. Symbol Parameter Conditions Min Typ Max Units DRIVER CHARACTERISTICS V OD Differential Output Voltage IO = 0 mA (No Load) 1.5 4.8 6.0 V VoDO Output Voltage I O = 0 mA (Output to GND) 0 6.0 V VoDO Output Voltage 0 6.0 V VT1 Differential Output Voltage (Termination Load) R L =5 4Ω (485) ( Figure 1) 1.5 2.0 5.0 V R L = 100Ω (422) 2.0 2.3 5.0 V ΔVT1 Balance of VT1 R L =5 4Ω (Note 3) −0.2 0.07 +0.2 V R L = 100Ω −0.2 0.07 +0.2 V VOS Driver Common Mode Output Voltage R L =5 4Ω (Figure 1) 0 2.5 3.0 V R L = 100Ω 0 2.3 3.0 V ΔVOS Balance of VOS R L =5 4Ω (Note 3) −0.2 0.08 +0.2 V R L = 100Ω −0.2 0.08 +0.2 V IOSD Driver Short-Circuit Output Current VO = +12V ( Figure 3) 134 290 mA VO =V CC 140 mA VO = 0V −140 mA VO = −7V −180 −290 mA RECEIVER CHARACTERISTICS V TH Differential Input High Threshold Voltage (Note 5) VO =V OH ,IO = −0.4 mA −7V ≤ VCM ≤ +12V −0.18 0 V VTL Differential Input Low Threshold Voltage (Note 5) VO =V OL ,IO = 8.0 mA VHST Hysteresis (Note 6) V CM =0 V 5 0 m V IIN Line Input Current (VCC = 4.75V, 5.25V, 0V) Other Input = 0V D E=V IH (Note 7) VI = +12V 0.7 1.0 mA IOSR Short Circuit Current V O = 0V RO −5.0 −30 −85 mA IOZ TRI-STATE ® Leakage Current V O = 0.4 to 2.4V −20 +20 µA VOH Output High Voltage (Figure 12) VID = 0V, IOH = −0.4 mA 2.5 3.5 V VID = OPEN, IOH = −0.4 mA 2.5 3.5 V VOL Output Low Voltage (Figure 12) VID = −0.5V, IOL = +8 mA 0.25 0.6 V VID = −0.5V, IOL = +16 mA 0.35 0.7 V R IN Input Resistance 12 19 k Ω DS36276 www.national.com 2

Electrical Characteristics(Notes 2, 4) (Continued) Over recommended Supply Voltage and Operating Temperature ranges, unless otherwise specified. Symbol Parameter Conditions Min Typ Max Units DEVICE CHARACTERISTICS V IH High Level Input Voltage DE, RE, or DI 2.0 V CC V VIL Low Level Input Voltage GND 0.8 V IIH High Level Input Current V IH = 2.4V 20 µA IIL Low Level Input Current V IL = 0.4V −100 µA VCL Input Clamp Voltage I CL = −18 mA −0.75 −1.5 V ICC Output Low Voltage Supply Current (No Load) DE = 3V, RE = 0V, DI = 0V 42 60 mA ICCR DE = 0V, RE = 0V, DI = 0V 28 45 mA ICCD DE = 3V, RE = 3V, DI = 0V 43 60 mA ICCX DE = 0V, RE = 3V, DI = 0V 31 50 mA Switching Characteristics(Note 4) Over recommended Supply Voltage and Operating Temperature ranges, unless otherwise specified. Symbol Parameter Conditions Min Typ Max Units DRIVER CHARACTERISTICS tPLHD Diff. Prop. Delay Low to High R L =5 4Ω C L =5 0p F C D =5 0p F (Figures 4, 5) 72 1 6 0 n s tPHLD Diff. Prop. Delay High to Low 7 19 60 ns tSKD Diff. Skew (|tPLHD –tPHLD |) 2 10 ns tr Diff. Rise Time 12 50 ns tf Diff. Fall Time 12 50 ns tPLH Prop. Delay Low to High R L =2 7Ω ,C L =1 5p F (Figures 6, 7) 22 45 ns tPHL Prop. Delay High to Low 22 45 ns tPZH Enable Time Z to High R L = 110Ω C L =5 0p F (Figure 8– Figure 11) 32 55 ns tPZL Enable Time Z to Low 32 65 ns tPHZ Disable Time High to Z 22 55 ns tPLZ Disable Time Low to Z 16 55 ns RECEIVER CHARACTERISTICS t PLH Prop. Delay Low to High V ID = −1.5V to +1.5V C L =1 5p F (Figures 13, 14) 15 40 70 ns tPHL Prop. Delay High to Low 15 42 70 ns tSK Skew (|tPLH –tPHL |) 2 15 ns tPZH Enable Time Z to High C L =1 5p F (Figures 15, 16) 15 50 ns tPZL Enable Time Z to Low 17 50 ns tPHZ Disable Time High to Z 24 50 ns tPLZ Disable Time Low to Z 19 50 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: Δ |VT1| andΔ |VOS | are changes in magnitude of VT1 and VOS , respectively, that occur when the input changes state. Note 4:All typicals are given for VCC = 5.0V and TA = +25˚C. Note 5:Threshold parameter limits specified as an algebraic value rather than by magnitude. Note 6:Hysteresis defined as VHST =V TH −V TL. Note 7:IIN includes the receiver input current and driver TRI-STATE leakage current. DS36276 www.national.com3

Typical Performance Characteristics Differential Output Voltage vs Output Current DS011383-21 Differential Output Voltage vs Output Current DS011383-22 Driver VOH vs IOH vs VCC DS011383-23 Driver VOH vs IOH vs Temperature DS011383-24 Driver VOL vs IOL vs VCC DS011383-25 Driver VOL vs IOL vs Temperature DS011383-26 DS36276 www.national.com 8

Typical Performance Characteristics(Continued) Receiver VOH vs IOH vs VCC DS011383-27 Receiver VOH vs IOH vs Temperature DS011383-28 Receiver VOL vs IOL vs VCC DS011383-29 Receiver VOL vs IOL vs Temperature DS011383-30 Supply Currrent vs Supply Voltage DS011383-31 Supply Current vs Temperature DS011383-32 DS36276 www.national.com9

Typical Performance Characteristics(Continued) Voltage Output vs Voltage Input (Hysteresis) DS011383-33 DS36276 www.national.com 10

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