MITSUBISHI MITSUBISHI 〈DIGITAL 〈DIGITAL ASSP〉 ASSP〉 M75176P, M75176P, M75177P M75177P M75178P, M75178P, M75179P M75179P RS-485 TRANSCEIVER RS-485 TRANSCEIVER DESCRIPTION Each of the M75176 to M75179 is a semiconductor IC with a built-in differential driver and a built-in differential receiver both of which meet the EIA standards RS-422A and RS-485. PIN CONFIGURATION (TOP VIEW) R← 1 RECEIVER OUTPUT FEATURES Common • 5V single power supply • With output control input (except M75179P) RECEIVER OUTPUT RE → 2 CONTROL INPUT DRIVER OUTPUT DE → 3 CONTROL INPUT APPLICATION High-speed data transmission interface for digital equipment DESCRIPTION OF FUNCTION The M75176P to M75179P are line interface ICs which meet EIA standards RS-422A and RS-485, and are suitable for long-distance, high-speed data transmission. The M75176P is designed to connect the driver circuit output and the receiver input to each other internally, and serves as a line transceiver. The M75177P/M75178P is designed to connect the receiver circuit output and the driver circuit input internally, and serves as a line repeater. The M75177P and M75178P enter the output enabled state with active “H” and active “L”, respectively. The M75179P is equipped with a built-in differential driver and a built-in differential receiver. It does not have an output control input pin but its output impedance at the power-OFF time goes high. VCC 7 ↔B 6 ↔A D→ 4 DRIVER INPUT Driver • 54Ω terminal resistor connectable between outputs. • High output impedance at power-OFF time • Built-in output current limit circuit Receiver • High input sensitivity (±200mV max.) • Hysteresis input (50mV typ.) • High input impedance (12kΩ min.) • “H” emitted when input is open (failsafe function) 8 5 I/O BUS GND M75176P 1 8 ←A T← 2 7 ←B OUTPUT CONTROL INPUT EN → 3 6 →Z 4 5 →Y VCC RECEIVER INPUT REPEATER OUTPUT GND DRIVER OUTPUT M75177P 1 8 ←A T← 2 7 ←B OUTPUT CONTROL INPUT EN → 3 6 →Z VCC REPEATER OUTPUT GND 5 →Y 4 RECEIVER INPUT DRIVER OUTPUT M75178P 1 8 ←A RECEIVER OUTPUT R ← 2 7 ←B DRIVER INPUT D → 3 6 →Z 4 5 →Y VCC RECEIVER INPUT GND DRIVER OUTPUT M75179P Outline 8P4 1 MITSUBISHI 〈DIGITAL ASSP〉 M75176P, M75177P M75178P, M75179P RS-485 TRANSCEIVER FUNCTION TABLE (a) M75176P Driver (Note 1) Receiver INPUTS D H L X OUTPUTS DE H H L A H L Z B L H Z INPUTS VID VID > 0.2V –0.2V < VID < 0.2V VID < –0.2V X OUTPUTS R H ✽ L Z RE L L L H (b) M75177P/M75178P INPUTS EN (M75177P) H H H L VID VID > 0.2V –0.2V < VID < 0.2V VID < –0.2V X (c) M75179P Driver INPUTS D H L Note 1: VID : X : ✽ : Z : 2 OUTPUTS EN (M75178P) L L L H T H ✽ L Z Y H ✽ L Z Receiver OUTPUTS Y H L (A applied voltage) – (B applied voltage) Either “L” or “H” Output state is not defined. High impedance state. Z L H INPUTS VID VID > 0.2V –0.2V < VID < 0.2V VID < –0.2V OUTPUTS R H ✽ L Z L ✽ H Z MITSUBISHI 〈DIGITAL ASSP〉 M75176P, M75177P M75178P, M75179P RS-485 TRANSCEIVER ABSOLUTE MAXIMUM RATINGS Symbol VCC VID VIE Pd Tstg Parameter Supply voltage Differential input voltage 75177/178/179 Enable input voltage 75176/177/178 Power dissipation (Note 2) Storage temperature Conditions Ratings –0.5 ~ +7 –25 ~ +25 –0.5 ~ +5.5 925 –65 ~ 150 When Ta=25°C Unit V V V mW °C Note 2: When Ta ≥ 25°C, do derating according to the attached thermal derating. RECOMMENDED OPERATING CONDITIONS Symbol Parameter VCC VI, VIC VID Supply voltage Bus pin voltage (each pin voltage, in-phase input voltage) Differential input voltage IOH “H” output current IOL “L” output current Topr Operating ambient temperature Driver Receiver Driver Receiver VOL < 0.45V VOL < 0.5V Min. 4.75 –7 –12 0 0 0 0 0 –20 Limits Typ. 5 Unit Max. 5.25 +12 +12 –60 –400 60 8 16 75 V V V mA mA mA °C ELECTRICAL CHARACTERISTICS (Driver) (VCC = 5V ± 5%, Ta = –20 ~ 75°C, unless otherwise noted) Symbol Parameter VIH VIL VIK |VOD1| “H” input voltage “L” input voltage Input clamp voltage Differential output voltage 1 |VOD2| Differential output voltage 2 ∆|VOD| VOL ∆|VOC| Differential output voltage variance width In-phase output voltage In-phase output voltage variance width IO Output current IOZ IIH IIL Off-state output current “H” input current “L” input current IOS Output short-circuit current ICC Supply voltage 75176 75177/178/179 75177/178 Test conditions II=–18mA IO=0mA Min. 2 RL=100Ω See Fig. 1. RL=54Ω See Fig. 1. 1.5 2 (Note 3) VOD1/2 1.5 RL=54/100Ω See Fig. 1. –1 Limits Typ.* 0.8 –1.5 6 V V V V V 2.18 2.08 VO=12V VO=–7V VCC=0V, VO=–7 ~ +12V VO=–7 ~ +12V VI=2.4V VI=0.4V VO=–7V VO=0V VO=VCC VO=12V Output enable Output disable Unit 2.42 Output disable No output load Max. 29.5 32.5 5 ±0.2 3 ±0.2 1 –0.8 ±100 ±300 20 –400 –250 –150 250 250 48 48 V V V mA mA mA mA mA mA mA *: The standard value is given on the condition of VCC = 5V and Ta = 25°C. Note 3: The standard is 1.9V (min.) when Ta ≤ 0°C. 3 MITSUBISHI 〈DIGITAL ASSP〉 M75176P, M75177P M75178P, M75179P RS-485 TRANSCEIVER SWITCHING CHARACTERISTICS (Driver) (VCC = 5V, Ta=25°C) Symbol tDD tTD tPLH tPHL tPZH tPZL tPHZ tPLZ Parameter Differential output delay time Differential output transition time Output “L - H” propagation delay time Output “H - L” propagation delay time “H” enable time “L” enable time “H” disable time “L” disable time Test conditions RL=54Ω CL=50pF See Fig. 2. RL=27Ω CL=50pF See Fig. 3. RL=110Ω CL=50pF See Figs. 4 & 5. Min. Limits Typ. 13 11 15 12 23 16 11 22 Max. 25 25 25 25 35 35 25 35 Unit ns ns ns ns ns ns ns ns ELECTRICAL CHARACTERISTICS (Receiver) (VCC = 5V ± 5%, Ta = –20 ~ 75°C, unless otherwise noted) Symbol VTH Parameter Test conditions VTL VT+ - VT– VIK VOH High threshold voltage Low threshold voltage Hysteresis width (Note 4) Enable input clamp voltage “H” output voltage VO=2.7V, IO=–0.4mA VO=0.5V, IO=16mA VOL “L” output voltage VID=–0.2V IOZ Off-state output current II Line input current IIH “H” enable input current IIL “L” enable input current ri IOS Input resistance Output short-circuit current VO=0V ICC Supply voltage No output load 75176 75177/178 Limits Typ.* Max. 0.2 –0.2 50 II=–18mA VID=0.2V, IOH=–0.4mA –1.5 2.7 IOL=8mA IOL=16mA 3.6 0.23 0.30 VO=0.4 ~ 2.4V VO=0.4V VO=2.4V Other input 0V 75176/177/178 75176 75177/178 Min. VO=12V VO=–7V VIH=2.7V VIL=0.4V 12 –15 0.45 0.5 ±20 –400 20 1 –0.8 20 –100 –400 –85 48 48 Output enable Output disable Unit V V mV V V V mA mA mA mA kΩ mA mA *: The standard value is given on the condition of VCC = 5V and Ta = 25°C. Note 4: The hysteresis width is the difference between positive threshold voltage VT+ and negative threshold voltage VT–. SWITCHING CHARACTERISTICS (Receiver) (VCC = 5V, Ta=25°C) Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ 4 Parameter Output “L - H” propagation delay time Output “H - L” propagation delay time “H” enable time “L” enable time “H” disable time “L” disable time Test conditions CL=15pF See Fig. 6. CL=15pF See Fig. 7. CL=15pF See Fig. 7. Min. Limits Typ. 22 19 9 11 17 22 Max. 35 35 20 20 35 35 Unit ns ns ns ns ns ns MITSUBISHI 〈DIGITAL ASSP〉 M75176P, M75177P M75178P, M75179P RS-485 TRANSCEIVER TEST CIRCUITS Fig. 1 RL / 2 VOD2 RL / 2 VOC Driver differential output voltage 2, in-phase output voltage Fig. 2 3V 1.5V Input P.G. (Note 5) Output RL Input 1.5V 0V CL (Note 6) tDD tDD 50Ω Output 3V (M75178P is 0V) 90% 50% 50% 10% Test circuit tTD tTD I/O waveform Driver differential output delay time and transition time Fig. 3 3V 2.3V P.G. (Note 5) 1.5V Input 1.5V 0V RL Input tPLH Output 50Ω VOH 2.3V CL (Note 6) 3V (M75178P is 0V) tPHL 2.3V VOL VOH Output tPHL 2.3V Test circuit tPLH 2.3V VOL I/O waveform Driver delay time Fig. 4 Output 0V or 3V P.G. (Note 5) RL CL (Note 6) Input 3V (M75178P) Input (M75176/177P) 1.5V 1.5V 0V tPHZ tPZH 0.5V VOH 50Ω 2.3V Output Test circuit 0V I/O waveform Driver enable/disable time Fig. 5 5V RL Output 3V or 0V P.G. (Note 5) 50Ω 1.5V Output 1.5V 0V tPLZ tPZL CL (Note 6) Input 3V (M75178P) Input (M75176/177P) 2.3V 0.5V 5V VOL Test circuit I/O waveform Driver enable/disable time Note 5: The pulse generator is PRR ≤ 1MHz, duty ratio = 50%, tr ≤ 6ns, tf ≤ 6ns, ZOUT = 50Ω. 6: CL includes jigs and probe capacitance. 5 MITSUBISHI 〈DIGITAL ASSP〉 M75176P, M75177P M75178P, M75179P RS-485 TRANSCEIVER Fig. 6 3V Input P.G. (Note 7) 1.5V Input 1.5V 0V Output 50Ω 1.5V tPHL tPLH CL (Note 8) VOH 0V M75177P is 3V 1.3V 1.3V Output VOL Test circuit I/O waveform Receiver propagation delay time Fig. 7 1.5V Output S1 2kΩ S2 5V –1.5V P.G. (Note 7) CL (Note 8) Input 5kΩ 50Ω S3 Test circuit (M75177P) (M75177P) 3V Input 3V Input 1.5V 1.5V (M75176/178P) 1.5V 1.5V (M75176/178P) 0V 0V tPZH tPZL VOH 4.5V 1.5V Output 1.5V Output 0V S1 1.5V side S2 open (M75177P) S1 1.5V side (M75176/178P) VOH 1.3V Output 1.3V S2 closed S3 closed Receiver enable/disable time Note 7: The pulse generator is PRR ≤ 1MHz, duty ratio = 50%, tr ≤ 6ns, tf ≤ 6ns, ZOUT = 50Ω. 8: CL includes jigs and probe capacitance. 6 0V tPLZ 0.5V S1 1.5V side 1.5V 1.5V (M75176/178P) 0V tPHZ Output S3 open 3V Input 1.5V 1.5V S2 closed (M75177P) 3V Input VOL S3 closed 0.5V S1 1.5V side VOL S2 closed S3 closed MITSUBISHI 〈DIGITAL ASSP〉 M75176P, M75177P M75178P, M75179P RS-485 TRANSCEIVER THERMAL DERATING SUPPLY CURRENT - SUPPLY VOLTAGE CHARACTERISTIC THERMAL DERATING CHARACTERISTIC 1000 SUPPLY CURRENT ICC (mA) 750 500 250 0 –20 40 Output disable EN = 0V 30 Output enable EN = 4.5V 20 M75177P A=0V B=4.5V Ta=25°C 10 0 0 20 40 60 0 80 2 DRIVER “H” OUTPUT VOLTAGE “L” OUTPUT VOLTAGE - OUTPUT CURRENT CHARACTERISTIC VOH 3 2 VOL 1 1 0 20 40 60 80 0 100 INPUT VOLTAGE WAVEFORM (V) 4 4 Load line RL=100Ω 3 Load line RL=54Ω VOC 2 VOD 1 1 0 20 40 60 80 SWITCHING CHARACTERISTIC SWITCHING CHARACTERISTIC 2 D input voltage waveform 0 2 VCC=5V Ta=25°C –2 0 –4 0 20 40 60 80 DIFFERENTIAL OUTPUT DELAY TIME tDD, DIFFERENTIAL OUTPUT TRANSITION TIME tTD (ns) 3 2 OUTPUT CURRENT IO (mA) Y-Z Differential output voltage waveform 5 4 OUTPUT CURRENT SOURCE IO (mA) 4 6 10 VCC=5V Ta=25°C 5 0 I/O VOLTAGE WAVEFORM (V) 0 “L” OUTPUT VOLTAGE VLO (V) 4 DIFFERENTIAL OUTPUT VOLTAGE WAVEFORM (V) “H” OUTPUT VOLTAGE VOH (V) 5 4 2 8 DIFFERENTIAL OUTPUT VOLTAGE IN-PHASE OUTPUT VOLTAGE - OUTPUT CURRENT CHARACTERISTIC DIFFERENTIAL OUTPUT VOLTAGE VOD (V) VCC=5V Ta=25°C 3 6 SUPPLY VOLTAGE VCC (V) AMBIENT TEMPERATURE Ta (°C) 5 4 IN-PHASE OUTPUT VOLTAGE VOC (V) POWER DISSIPATION Pd (mW) 50 8P4 Unit 0 100 VCC=5V Ta=25°C 6 Y output voltage waveform 4 2 D input voltage waveform Z output voltage waveform 0 0 20 40 60 80 OUTPUT “L-H” PROPAGATION DELAY TIME tPLH, OUTPUT “H-L” PROPAGATION DELAY TIME tPHL (ns) 7 MITSUBISHI 〈DIGITAL ASSP〉 M75176P, M75177P M75178P, M75179P RS-485 TRANSCEIVER RECEIVER I/O TRANSMISSION CHARACTERISTIC (A→R) INPUT CURRENT - INPUT VOLTAGE CHARACTERISTIC (A) 2.4 INPUT CURRENT II (mA) VIC=0V OUTPUT VOLTAGE VO (V) B=0V Ta=25°C VCC=5V IO=0mA Ta=25°C 5 4 3 VIC=–7V 2 VIC=12V 1 1.6 0.8 0 VCC=5V VCC=0V –0.8 –1.6 0 –160 –80 0 80 160 –20 INPUT VOLTAGE VID (mV) VID=0.2V Ta=25°C VCC=4.75V 2 1 0 –40 –60 –80 0.4 VCC=4.75V 5V 5.75V 0.3 0.2 0.1 –100 0 4 8 12 16 “H” OUTPUT CURRENT IOH (mA) “L” OUTPUT CURRENT IOL (mA) SWITCHING CHARACTERISTIC SWITCHING CHARACTERISTIC VCC=5V B=1.5V Ta=25°C 6 I/O VOLTAGE WAVEFORM (V) I/O VOLTAGE WAVEFORM (V) –20 R output voltage waveform A input voltage waveform 2 0 0 20 40 60 80 OUTPUT “L-H” PROPAGATION DELAY TIME tPLH (ns) 8 VID=–0.2V Ta=25°C 0 0 4 20 “L” OUTPUT VOLTAGE - “L” OUTPUT CURRENT CHARACTERISTIC “L” OUTPUT VOLTAGE VOL (V) “H” OUTPUT VOLTAGE VOH (V) VCC=5V 3 10 0.5 VCC=5.25V 4 0 INPUT VOLTAGE VI (V) “H” OUTPUT VOLTAGE - “H” OUTPUT CURRENT CHARACTERISTIC 5 –10 20 VCC=5V B=1.5V Ta=25°C 6 R output voltage waveform 4 2 A input voltage waveform 0 0 20 40 60 80 OUTPUT “H-L” PROPAGATION DELAY TIME tPHL (ns) MITSUBISHI 〈DIGITAL ASSP〉 M75176P, M75177P M75178P, M75179P RS-485 TRANSCEIVER APPLICATION EXAMPLE M75177P M75176P M75176P Data input Data output RT RT RT Data output RT Data input M75178P Data output Data input RT=Terminal resistor M75176P 9