DS3695A/DS3695AT/DS3696A General Description The DS3695A and DS3696A are high speed differential TRI-STATE bus/line transceivers designed to meet the re- quirements of EIA standard RS485 with extended common mode range (+ 12V to 7V), for multipoint data transmis- sion. In addition they are compatible with requirements of RS-422. The driver and receiver outputs feature TRI-STATE capabili- ty. The driver outputs remain in TRI-STATE over the entire common mode range of +12V to 7V. Bus faults that cause excessive power dissipation within the device trigger a thermal shutdown circuit, which forces the driver outputs into the high impedance state. The DS3696A provides an output pin (TS) which reports the thermal shutdown of the device. TS is an open collector pin with an internal 10 kN. pull-up resistor. This allows the TS outputs of several devic- es to be wire OR-ed. Both AC and DC specifications are guaranteed over the 0C to 70C temperature and 4.75V to 5.25V supply voltage range. AV vationai Semiconductor DS3695A/DS3695AT/DS3696A Multipoint RS485/RS422 Transceivers Features @ Meets EIA standard RS485 for multipoint bus transmis- sion and is compatible with RS-422 @ 10 ns driver propagation delays (typical) mw Single +5V supply m --7V to +12V bus common mode range permits +7V ground difference between devices on the bus m@ Thermal shutdown protection @ High impedance to bus with driver in TRISTATE or with power off, over the entire common mode range al- lows the unused devices on the bus to be powered down m Combined impedance of a driver output and receiver in- put is less than one RS485 unit load, allowing up to 32 transceivers on the bus @ 70 mV typical receiver hysteresis m Available in SOIC packaging Connection and Logic Diagram Molded Package, Small Outline (M) oS3e5A ro See a Lei BUS o 5_ ona) o4 oar) TUF /5272-1 Top View ps3e38a Top View Note: TS was LF (Line Fault) on previous datasheets, TS goes low upon thermal shutdown. Order Number DS3695AM, DS3695ATM or DS3696AM See NS Package Number M08A TL/F/5272-2 http: //wew.national.com 4-12Absolute Maximum Ratings (note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Recommended Operating Conditions Supply Voltage, Vcc Supply Voltage, Vcc 7V Control tnput Voltages 7V Driver Input Voltage 7v Driver Output Voltages +15V/10V Receiver Input Voltages + 15V/10V Receiver Output Voltage 5.5V Continuous Power Dissipation @ 25C M Package 630 mW (Note 4) Storage Temp. Range Lead Temp. (Soldering 4 seconds) 65C to + 150C 260C Bus Voltage Operating Free Air Temp. (Ta) Commercial (DS3695AM) Industrial (DS3695ATM) Commercial (OS3696AM) Min 4.75 Max Units 5.25 v +12 Vv +70 C +85 C +40 C Electrical Characteristics orc < tT, < 70C. 4.75V < Voc < 5.25V unless otherwise specified (Notes 2 & 3) Symbol Parameter Conditions Min | Typ | Max | Units Vopi Differential Driver Output Io =0 5 v Voltage (Unioaded) Vop2 Differential Driver Output R = 500; (RS-422) (Note 5) 2 Voltage (with Load) R = 279: (RS-485) 15 Vv AVop Change in Magnitude of Driver Differential Output Voltage For 0.2 Vv Complementary Output States Voc Driver Common Mode Output Voltage R= 272 3.0 Vv AlVoc| | Change in Magnitude of Driver Common Mode Output Voltage 0.2 Vv For Complementary Output States Vie Input High Voltage 2 Vv ViL Input Low Voltage DI, DE, 0.8 Vv Vor Input Clamp Voltage RE, RE/DE lin = 18mA -15|] V hie Input Low Current Vit = 0.4V 200|) pA ty Input High Current ViH = 2.4V 20 pA lIN Input Current DO/RI, BO/RI | Voc = OV or 5.25V | Viy = 12V +1.0] mA RI, Ri DE or RE/DE = OV Vin = 7V ~o8 | mA VTH Differential Input Threshold 7V < Vom S +12V -02 +02 Vv Voltage for Receiver AVTH Receiver Input Hysteresis Vom = OV 70 mV Vou Receiver Output High Voltage lou = 400 pA 2.4 Vv Vor Output Low Voltage | RO lot = 16 mA (Note 5) 0.5 TS lo. = &MA 0.45 loza OFF-State (High Impedance) Voc = Max $20 A Output Current at Receiver 0.4V < Vo < 2.4V B Rin Receiver Input Resistance 7V < Vom S +12V 12 ko lec Supply Current No Load Driver Outputs Enabled 42 60 mA (Note 5) Driver Outputs Disabled 27 40 mA http://www.national.com V969ESC/LVS69ESd/VS69ESaDS3695A/DS3695AT/DS3696A Electrical Characteristics OC < Ta < 70C, 4.75V < Voc < 5.25V unless otherwise specified (Notes 2 & 3) (Continued) Symbol Parameter Conditions Min | Typ | Max | Units loso Driver Short-Circuit Vo = 7N (Note 5) 250 | mA. Output Current Vo = + 12V (Note 5) +250 | mA los Receiver Short-Circuit Vo = OV _ _ Output Current 15 85 mA specified. Note 3: All typicals are given for Voc = SV and Ta = 28C. Note 4: Derate linearly at 6.5 mW/C to 337 mW at 70C. Note 5: All limits for which Note 5 is applied must be derated by 10% for DS3695AT. Other parameters remain the same for this extended temperature range device ( 40C < Ta s +85C). Switching Characteristics OC < Ta < 70C, 4.75V < Voc < 5.25V unless otherwise specified (Note 3) Receiver Switching Characteristics (Figures 1, 2and 3) Note 1: Absoiute maximum ratings are those beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device should be operated at these limits. The tables of Electrical Characteristics provide conditions for actual device operation. Note 2: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device ground unless otherwise Cir = Cle = 100 pF Symbol Conditions Min Typ Max Units teLH CL = 15pF 15 28 42 ns teHL Coad S2 15 28 a2 ns ItpLH-tPHt! 3 ns tpLz C_ = 15 pF, $2 Open 5 29 35 ns tpHz C. = 15 pF, S1 Open 5 12 16 ns tpze C_ = 15 pF, S2 Open 7 15 28 ns tezH C. = 15 pF, $1 Open 7 15 20 ns Driver Switching Characteristics Symboi Conditions Min Typ Max Units SINGLE ENDED CHARACTERISTICS (Figures 4, 5 and 6) teLH Ripipe ~ 602 9 15 22 ns teHL C1 = CL2 = 100 pF 9 15 22 ns tsxewlteLy-teHL 0 2 8 ns tpLz Cy = 15 pF, S2 Open 7 15 30 ns tpHz Cy = 15 pF, S1 Open 7 16 30 ns tez. C, = 100 pF, S2 Open 30 35 50 ns tezH C_ = 100 pF, St Open 30 35 50 ns DIFFERENTIAL SWITCHING CHARACTERISTICS (Figure 7} te tt Apier ~ 600 6 10 18 ns http://www.national.com 4-14AC Test Circuits and Switching Waveforms TEST Vi POINT 81 nw OS RECEIVER hy OUTPUT 4 AL OOKES Zh a16 OF (INCLUDES PROBE : om CAPACITANCE) ey TL/F/$272-6 FIGURE 1. Receiver Propagation Delay Test Circuit 25v = INPUT RR ov ov 25v | SPL PL Von {= IMHz: < 10ns Sv rt S 16ns 15 OyTPUT Ro Vou TL/F/5272-7 Note: Differential input voltage may be realized by grounding Fil and pulsing Al between + 2.5V and 2.5V FIGURE 2. Receiver Input-to-Output Propagation Delay Timing 3 WE TC A sy f= 1MHe2: ty s 10ng 15 A 2 tps 10ns E > oe ov TC m~| UL hz SY % QuTPUT Uv WORMALLY LOW Os 7 Yo ~ iH t La Von Os fo WORMALLY WH wv x wuz FIGURE 3. Receiver Enabie/Disable Propagation Delay Timing TL/F/5272-8 4-15 http://www.nationa!.com V96SESC/LVS69ESC/vS69ESaDS3695A/DS3695AT/DS3696A AC Test Circuits and Switching Waveforms (Continued) an bs " Veo rt sion e C4 = 100pr Ren TEST 2 a 3 Flore - o = 60n J i= HS GNCLUDES PROBE T AND Jia CAPACITANCE) = Note: Uniess otherwise specified TL/F/5272-9 the switches are closed. TL/F/5272-1) FIGURE 4. Driver Propagation Delay Test Circuits t= 1MHz:t <10ns ot 1.5V 4 <10ns 1.54 ov tPLH PHL 4 i D0 #1/2Vy 1/2q Yo ; 50% 50% po = } | /e skew SKEW TL/F/272~11 Note: tp_y and tp}, are measured to the respective 50% points. tgxew is the difference between propagation delays of the complementary outputs. FIGURE 5. Driver input-to-Output Propagation Delay Timing (Single-Ended) w i / f= TMHr: ts Ins OE of E Fo tes 10as iby 15 ov . / ~} im Sv 7 4 rT allen . | Ae VoL ; a5v av . sv bo, 06 2. MALLY HGR a Mon >| INZ je ~! tH FIGURE 6. Driver Enable/Disable Propagation Delay Timing 3V DI F=1MHz & S10 ns ov / tot \ a + | . TLAF/5272-" 2 +Vg | " 90% 90% Vpirr = po" "DO ov av 10% 10% Yo t 4 TL/F/5272-13 FIGURE 7. Driver Differential Transition Timing inttp://weww.national.com 4-16Function Tables DS3695A/DS3696A Transmitting Inputs Line DI Condition Outputs DO TS* (DS3696A Only) xxx x |w o- = xxoO~ No Fault No Fault x Fault NN=70 3 NNO rrlirr DS3695A/DS3696A Receiving Inputs Output RI-Fl RO TS* (DS3696A Only) 0 0 0 1 2+0.2V <-0.2V Inputs Open** X Noe 04 H H H H X Don't care condition Z High impedance state Fault Improper line conditions causing excessive power dissipation in the driver, such as shorts or bus contention situations * TS is an open collector output with an on-chip 10 kf pull-up resistor. ** This is a fail safe condition Typical Application DSI695A/0S3636A DS3695A/DS3896A d pSses7saees - Ry Ry oh , Ry ~<f | <b 083697/083698 DS3685A/0S3686A TL/F/5272-18 Note: Repeater control logic not shown. See AN-702. 4-17 http://www.national.com