SN75178BP

SN75177B, SN75178B DIFFERENTIAL BUS REPEATERS SLLS002C – D2606, JULY 1985 – REVISED FEBRUARY 1993 • • • • • • • • • • • • SN75177B . . . D OR P PACKAGE (TOP VIEW) Meets EIA Standards RS-422-A and RS-485 and CCITT Recommendations V.11 and X.27 Designed for Multipoint Transmission on Long Bus Lines in Noisy Environments 3-State Outputs Bus Voltage Range . . . – 7 V to 12 V Positive and Negative Current Limiting Driver Output Capability . . . 60 mA Max Driver Thermal Shutdown Protection Receiver Input Impedance . . . 12 kΩ Min Receiver Input Sensitivity . . . ± 200 mV Receiver Input Hysteresis . . . 50 mV Typ Operates From Single 5-V Supply Low Power Requirements VCC T EN GND 1 8 2 7 3 6 4 5 A B Z Y SN75178B . . . P PACKAGE (TOP VIEW) VCC T EN GND 1 8 2 7 3 6 4 5 A B Z Y THE SN75177B IS NOT RECOMMENDED FOR NEW DESIGN description The SN75177B and SN75178B differential bus repeaters are monolithic integrated devices each designed for one-way data communication on multipoint bus transmission lines. These devices are designed for balanced transmission bus line applications and meet EIA Standard RS-422-A and RS-485 and CCITT Recommendations V.11 and X.27. Each device is designed to improve the performance of the data communication over long bus lines. The SN75177B and SN75178B are identical except for the complementary enable inputs, which allow the devices to be used in pairs for bidirectional communication. The SN75177B and SN75178B feature positive- and negative-current limiting 3-state outputs for the receiver and driver. The receiver features high input impedance, input hysteresis for increased noise immunity, and input sensitivity of ± 200 mV over a common-mode input voltage range of – 7 V to 12 V. The driver features thermal shutdown for protection from line fault conditions. Thermal shutdown is designed to occur at a junction temperature of approximately 150°C. The driver is designed to drive current loads up to 60 mA maximum. The SN75177B and SN75178B are designed for optimum performance when used on transmission buses employing the SN75172 and SN75174 differential line drivers, SN75173 and SN75175 differential line receivers, or SN75176B bus transceiver. Function Tables SN75177B DIFFERENTIAL INPUTS ENABLE A–B EN T OUTPUTS Y Z VID ≥ 0.2 V – 0.2 V < VID < 0.2 V H H H L H ? ? ? VID ≤ 0.2 V X H L L H L Z Z Z SN75178B DIFFERENTIAL INPUTS ENABLE A–B EN T OUTPUTS Y Z VID ≥ 0.2 V – 0.2 V < VID < 0.2 V L H H L L ? ? ? VID ≤ 0.2 V X L L L H H Z Z Z H = high level, L = low level, ? = indeterminate, X = irrelevant, Z = impedance (off) Copyright  1993, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 2–1 SN75177B, SN75178B DIFFERENTIAL BUS REPEATERS SLLS002C – D2606, JULY 1985 – REVISED FEBRUARY 1993 logic symbols† logic diagrams (positive logic) SN75177B SN75177B EN A B T 3 8 EN EN 5 6 7 2 A Y B Z T A B T 3 8 8 5 7 6 2 Receiver EN EN 5 7 6 2 A Y B Z T 3 8 5 7 6 2 Receiver Driver schematics of inputs and outputs EQUIVALENT OF EACH INPUT TYPICAL OF ALL DRIVER OUTPUTS VCC VCC Req Input Output Driver input: Req = 3 kΩ NOM GND Enable inputs: Req = 8 kΩ NOM EQUIVALENT OF EACH RECEIVER INPUT TYPICAL OF RECEIVER OUTPUT VCC 85 Ω NOM VCC 960 Ω NOM 16.8 kΩ 960 Ω NOM NOM 2–2 Z Driver † These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. Input Y SN75178B SN75178B EN 3 Output POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Y Z SN75177B, SN75178B DIFFERENTIAL BUS REPEATERS SLLS002C – D2606, JULY 1985 – REVISED FEBRUARY 1993 absolute maximum ratings over operating free-air temperature range (unless otherwise noted) Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Voltage range at any bus terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 10 V to 15 V Differential input voltage (see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 25 V Enable input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Continuous total dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table Operating free-air temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C NOTES: 1. All voltage values, except differential input voltage, are with respect to network ground terminal. 2. Differential input voltage is measured at the noninverting input with respect to the corresponding inverting input. DISSIPATION RATING TABLE TA ≤ 25°C POWER RATING DERATING FACTOR ABOVE TA = 25°C TA = 70°C POWER RATING D 725 mW 5.8 mW/°C 464 mW P 1000 mW 8.0 mW/°C 640 mW PACKAGE recommended operating conditions Supply voltage, VCC High-level input voltage, VIH EN or EN low-level input voltage, VIL EN or EN MAX UNIT 5 5.25 V – 7† Differential input voltage, VID Low level output current, Low-level current IOL NOM 2 Common-mode input voltage, VIC High level output current, High-level current IOH MIN 4.75 Driver Receiver Driver V 0.8 V 12 V ± 12 V – 60 mA – 400 µA 60 Receiver 8 mA Operating free-air temperature, TA 0 70 °C † The algebraic convention, where the less-positive (more-negative) limit is designated minimum, is used in this data sheet for common-mode input voltage and threshold voltage. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 2–3 SN75177B, SN75178B DIFFERENTIAL BUS REPEATERS SLLS002C – D2606, JULY 1985 – REVISED FEBRUARY 1993 DRIVER SECTION electrical characteristics over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) PARAMETER TEST CONDITIONS VIK VO Input clamp voltage Output voltage II = – 18 mA IO = 0 |VOD1| Differential output voltage IO = 0 |VOD2| Differential output voltage |VOD3| Differential output voltage ∆|VOD| Change g in magnitude g of diferential output voltage‡ VOC Common mode output voltage Common-mode ∆|VOC| Change of g in magnitude g common-mode output voltage‡ IO IOZ Output current IIH IIL High-level input current IOS Short-circuit output current ICC High-impedance-state output current Low-level input current Supply current (total package) TYP† MIN MAX UNIT – 1.5 V 0 6 V 1.5 6 V RL = 100 Ω , See Figure 1 1/2 VOD1 or 2 § RL = 54 Ω, See Figure 1 1.5 See Note 3 V 2.5 1.5 RL = 54 Ω or 100 Ω Ω, See Figure 1 5 5 V ± 0.2 02 V 3 –1 VCC = 0, VO = – 7 V to 12 V VO = – 7 V to 12 V VI = 2.4 V VI = 0.4 V VO = – 7 V VO = VCC VO = 12 V V 02 ± 0.2 V ± 100 µA ± 100 µA 20 µA – 400 µA – 250 250 mA 250 No load Outputs enabled 57 70 Outputs disabled 26 35 mA † All typical values are at VCC = 5 V and TA = 25°C. ‡ ∆|VOD| and ∆|VOC| are the changes in magnitude of VOD and VOC, respectively, that occur when the input is changed from a high level to a low level. § The minimum VOD2 with a 100-Ω load is either 1/2 VOD1 or 2, whichever is greater. NOTE 3: See Figure 3.5 of EIA Standard RS-485. switching characteristics, VCC = 5 V, TA = 25°C PARAMETER TEST CONDITIONS tdD ttD Differential-output delay time tPZH tPZL Output enable time to high level RL = 110 Ω, Output enable time to low level RL = 110 Ω, tPHZ tPLZ Output disable time from high level RL = 110 Ω, Output disable time from low level RL = 110 Ω, 2–4 Differential-output transition time RL = 54 Ω Ω, POST OFFICE BOX 655303 TYP MAX 15 20 ns 20 30 ns See Figure 4 85 120 ns See Figure 5 40 60 ns See Figure 4 150 250 ns See Figure 5 20 30 ns See Figure 3 • DALLAS, TEXAS 75265 MIN UNIT SN75177B, SN75178B DIFFERENTIAL BUS REPEATERS SLLS002C – D2606, JULY 1985 – REVISED FEBRUARY 1993 SYMBOL EQUIVALENTS DATA SHEET PARAMETER RS-422-A RS-485 VO |VOD1| Voa, Vob Vo Voa, Vob Vo |VOD2| Vt (RL = 100 Ω) Vt (RL = 54 Ω) Vt (Test Termination) Measurement 2) ∆|VOD| | |Vt| – |Vt|| | |Vt| – |Vt|| VOC ∆|VOC| IOS |VOS| |VOS – VOS| |VOS| |VOS – VOS| IO |Ixa|,|Ixb| |VOD3| |Isa|,|Isb| Iia,Iib RECEIVER SECTION electrical characteristics over recommended ranges of common-mode input voltage, supply voltage, and operating free-air temperature (unless otherwise noted) PARAMETER VT+ VT– Positive-going input threshold voltage Vhys VIK Input hysteresis (VT+ – VT–) TEST CONDITIONS VO = 2.7 V, VO = 0.5 V, Negative-going input threshold voltage IO = – 0.4 mA IO = 8 mA TYP† MAX 0.2 – 0.2‡ Input clamp voltage at EN II = – 18 mA VID = 200 mV, See Figure 2 IOH = – 400 µA, IOL = 8 mA, High-level output voltage VOL Low-level output voltage VID = – 200 mV, See Figure 2 IOZ High impedance state output current High-impedance-state VO = 0.4 0 4 V to 2 2.4 4V II Line input current Other input at 0 V, See Note 4 IIH IIL High-level enable-input current ri Input resistance IOS Short-circuit output current 2.7 0.45 20 – 400 VI = 12 V VI = – 7 V 1 – 0.8 20 – 200 V µA mA µA µA kΩ – 15 No load V V 12 Supply Su ly current (total package) ackage) V mV – 1.5 VIH = 2.7 V VIL = 0.4 V Low-level enable-input current UNIT V 50 VOH ICC MIN – 85 Outputs enabled 57 70 Outputs disabled 26 35 mA mA † All typical values are at VCC = 5 V, TA = 25°C. ‡ The algebraic convention, where the less-positive (more-negative) limit is designated minimum, is used in this data sheet for common-mode input voltage and threshold voltage levels only. NOTE 4: Refer to EIA Standard RS-422 for exact conditions. switching characteristics, VCC = 5 V, TA = 25°C PARAMETER TEST CONDITIONS tPLH tPHL Propagation delay time, low-to-high level output tPZH tPZL Output enable time to high level tPHZ tPLZ Output disable time from high level Propagation delay time, high-to-low level output Output enable time to high level Output disable time from low level POST OFFICE BOX 655303 VID = – 1.5 V to 1.5 V,, CL = 15 pF, See Figure 6 CL = 15 pF, pF See Figure 7 CL = 15 pF, pF See Figure 8 • DALLAS, TEXAS 75265 MIN TYP MAX 19 35 30 40 10 20 12 20 25 35 17 25 UNIT ns ns ns 2–5 SN75177B, SN75178B DIFFERENTIAL BUS REPEATERS SLLS002C – D2606, JULY 1985 – REVISED FEBRUARY 1993 PARAMETER MEASUREMENT INFORMATION RL VOD2 2 VID RL 2 VOH VOC +IOL VOL Figure 1. Driver VOD and VOC – IOH Figure 2. Receiver VOH and VOL 3V Input Generator (see Note A) RL = 54 Ω 50 Ω 1.5 V CL = 50 pF (see Note B) 1.5 V 0V tdD tdD Output Output 90% 50% ≈ 2.5 V 50% 10% ≈ – 2.5 V ttD VOLTAGE WAVEFORMS ttD TEST CIRCUIT Figure 3. Driver Differential-Output Test Circuit and Voltage Waveforms Output S1 0 V or 3 V Generator (see Note A) ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ (SN75178B) Input 3V 1.5 V 1.5 V (SN75177B) 50 Ω CL = 50 pF (see Note B) SN75178B Enable is Active Low 0V 0.5 V tPZH RL = 110 Ω VOH Output 2.3 V tPHZ Voff ≈ 0 V VOLTAGE WAVEFORMS TEST CIRCUIT Figure 4. Driver Enable and Disable Times 5V S1 RL = 110 Ω Output 3 V or 0 V Generator (see Note A) 50 Ω SN75178B Enable is Active Low ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ (SN75178B) Input 3V 1.5 V 1.5 V 0V (SN75177B) tPZL tPLZ CL = 50 pF (see Note B) Output 2.3 V 5V 0.5 V VOL VOLTAGE WAVEFORMS TEST CIRCUIT Figure 5. Driver Enable and Disable Times NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR ≤ 1 MHz, 50% duty cycle, tr ≤ 6 ns, tf ≤ 6 ns, ZO = 50 Ω. B. CL includes probe and jig capacitance. 2–6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 SN75177B, SN75178B DIFFERENTIAL BUS REPEATERS SLLS002C – D2606, JULY 1985 – REVISED FEBRUARY 1993 PARAMETER MEASUREMENT INFORMATION 3V Input Generator (see Note A) 1.5 V Output 50 Ω 1.5 V 0V 1.5 V CL = 15 pF (see Note B) tPHL tPLH VOH Output 1.3 V 1.3 V VOL TEST CIRCUIT VOLTAGE WAVEFORMS Figure 6. Receiver Propagation Delay Times S1 1.5 V Output S2 2 kΩ –1.5 V 5V CL = 15 pF (see Note B) Generator (see Note A) 5 kΩ (see Note C) 50 Ω S3 TEST CIRCUIT ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ (SN75177B) Input 3V S1 to 1.5 V S2 Open S3 Closed 0V 1.5 V (SN75178B) tPZH ÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁ (SN75177B) Input (SN75178B) 3V S1 to –1.5 V S2 Closed S3 Open 0V 1.5 V tPZL VOH 1.5 V Output ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ 0V (SN75177B) Input (SN75178B) 1.5 V 3V S1 to 1.5 V S2 Closed S3 Closed 0V tPHZ Output 0.5 V ≈ 4.5 V Output ÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁ 1.5 V VOL (SN75177B) Input (SN75178B) 3V S1 to –1.5 V S2 Closed S3 Closed 0V 1.5 V tPLZ ≈ 1.3 V VOH Output 0.5 V ≈ 1.3 V VOL VOLTAGE WAVEFORMS Figure 7. Receiver Output Enable and Disable Times NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR ≤ 1 MHz, 50% duty cycle, tr ≤ 6 ns, tf ≤ 6 ns, ZO = 50 Ω. B. CL includes probe and jig capacitance. C. All diodes are 1N916 or equivalent. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 2–7 SN75177B, SN75178B DIFFERENTIAL BUS REPEATERS SLLS002C – D2606, JULY 1985 – REVISED FEBRUARY 1993 TYPICAL CHARACTERISTICS DRIVER HIGH-LEVEL OUTPUT VOLTAGE vs HIGH-LEVEL OUTPUT CURRENT DRIVER LOW-LEVEL OUTPUT VOLTAGE vs LOW-LEVEL OUTPUT CURRENT 5 5 VCC = 5 V TA = 25°C 4 3.5 3 2.5 2 ÁÁ ÁÁ ÁÁ 1.5 1 VCC = 5 V TA = 25°C 4.5 VOH – High-Level Output Voltage – V VOH – High-Level Output Voltage – V 4.5 4 3.5 3 2.5 2 ÁÁÁ ÁÁÁ ÁÁÁ 1.5 1 0.5 0.5 0 – 20 0 – 40 – 60 – 80 – 100 – 120 0 0 20 40 80 100 120 IOH – Low-Level Output Current – mA IOH – High-Level Output Current – mA Figure 8 Figure 9 DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs DRIVER OUTPUT CURRENT RECEIVER OUTPUT VOLTAGE vs DIFFERENTIAL INPUT VOLTAGE 5 4 VCC = 5 V VCC = 5 V TA = 25°C 3.5 IO = 0 TA = 25°C 4 VO V O – Output Voltage – V VOD – Differential Output Voltage – V 60 3 2.5 2 1.5 ÁÁ ÁÁ VIC = – 12 V VIC = 0V VIC = 12 V 3 VT– VT+ VT– VT– VT+ VT+ 2 1 1 0.5 0 0 10 20 30 40 50 60 70 80 90 100 0 –125 –100 –75 –50 –25 IO – Output Current – mA Figure 10 2–8 0 25 Figure 11 POST OFFICE BOX 655303 50 75 100 125 VID – Differential Input Voltage – mV • DALLAS, TEXAS 75265 SN75177B, SN75178B DIFFERENTIAL BUS REPEATERS SLLS002C – D2606, JULY 1985 – REVISED FEBRUARY 1993 TYPICAL CHARACTERISTICS RECEIVER HIGH-LEVEL OUTPUT VOLTAGE vs HIGH-LEVEL OUTPUT CURRENT RECEIVER HIGH-LEVEL OUTPUT VOLTAGE vs FREE-AIR TEMPERATURE 5 VID = 0.2 V TA = 25°C VOH – High-Level Output Voltage – V VOH – High-Level Output Voltage – V 5 4 3 VCC = 5.25 V 2 ÁÁ ÁÁ ÁÁ VCC = 5 V VCC = 4.75 V 1 VCC = 5 V VID = 200 mV IOH = – 440 µA 4 3 2 ÁÁ ÁÁ ÁÁ 1 0 0 0 – 10 – 20 – 30 – 40 – 50 0 10 20 Figure 12 0.6 0.5 VOL – Low-Level Output Voltage – V VOL – Low-Level Output Voltage – V VCC = 5 V TA = 25°C 0.4 0.3 0.2 0.1 0 15 60 70 80 RECEIVER LOW-LEVEL OUTPUT VOLTAGE vs FREE-AIR TEMPERATURE 0.6 10 50 Figure 13 RECEIVER LOW-LEVEL OUTPUT VOLTAGE vs LOW-LEVEL OUTPUT CURRENT 5 40 TA – Free-Air Temperature – °C IOH – High-Level Output Current – mA 0 30 20 25 30 0.5 VCC = 5 V VID = – 200 mV IOL = 8 mA 0.4 0.3 0.2 0.1 0 – 40 – 20 0 20 40 60 80 100 120 TA – Free-Air Temperature – °C IOL – Low-Level Output Current – mA Figure 14 Figure 15 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 2–9 SN75177B, SN75178B DIFFERENTIAL BUS REPEATERS SLLS002C – D2606, JULY 1985 – REVISED FEBRUARY 1993 APPLICATION INFORMATION 1/2 SN75179B Direction RT RT Control SN75177B 1/2 SN75179B SN75176B SN75176B RT RT RT RT SN75178B SN75176B NOTE: The line should be terminated at both ends in its characteristic impedance. Stub lengths off the main line should be kept as short as possible. Figure 16. Typical Application Circuit 2–10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PACKAGE OPTION ADDENDUM www.ti.com 10-Dec-2020 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan (2) Lead finish/ Ball material MSL Peak Temp Op Temp (°C) Device Marking (3) (4/5) (6) SN75178BP ACTIVE PDIP P 8 50 RoHS & Green NIPDAU N / A for Pkg Type 0 to 70 SN75178BP (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of