GM490E

GM488E/GM489E/GM490E/GM491E Low-Power,RS-485/RS-422 1. Feature 3. General Description ● The GM488E, GM489E, GM490E and GM491E are low-power transceivers for RS-485 and RS- 422 communication in harsh environments. Each driver output and receiver input is protected against ±15kV electrostatic discharge (ESD) shocks without latch-up. Each part contains one driver and one receiver. The GM488E and GM489E feature reduced slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, thus allowing error-free data transmission up to 1Mbps. The driver slew rates of the GM490E and GM491E are not limited, allowing them to transmit up to 2.5Mbps. These transceivers draw between 120µA and 500µA of supply current when unloaded or fully loaded with disabled drivers. All parts operate from a single 5V supply. Drivers are short circuit current limited and are protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a logic-high output if the input is open circuit. ● ● ● ● ● ● ● 1/8 Unit-load option available (up to 256 nodes on the bus) Bus-pin ESD protection exceeds 15kV Data transmission up to 1Mbps (2.5Mbps for GM490E and GM491E) Glitch-free power-up and power-down protection for hot-plugging applications Bus idle, open, and short circuit fail safe Designed for RS-422 and RS485 networks Driver current limiting and thermal shutdown 5V Devices available 2. APPLICATIONS ● Low-Power RS-485 Transceivers Low-Power RS-422 Transceivers ● Level Translators ● Transceivers for EMI-Sensitive Applications ● Industrial-Control Local Area Networks ● Figure 1 Simplified Schematic www.gmmicro.com Copyright © GATEMODE Corp. -1- Tel: (+86) 13135660803 Email:sales@gmmicro.com GM488E/GM489E/GM490E/GM491E Low-Power,RS-485/RS-422 4. Specifications 4.1 ABSOLUTE GMIMUM RATINGS Parameter VCC Description MIN Supply Voltage MAX UNIT 6.5 V RE , DE Control Input Voltage 0.5 VCC+0.5V V DI Driver Input Voltage 0.5 VCC+0.5V V A, B Driver Output Voltage -8 +13V V A, B Receiver Input Voltage -8 +13V V RO Receiver Output Voltage 0.5 VCC+0.5V Storage Temperature Range -65 160 °C 4.2 DC ELECTRICAL CHARACTERISTICS (VCC = 5V ±5%, TA = TMIN to TGM, unless otherwise noted.) (Notes 1, 2) PARAMETER Differential Driver Output (no load) Differential Driver Output (with load) SYMBOL MIN CONDITIONS TYP VOD1 VOD2 R = 50Ω (RS-422) MAX UNIT 5 V 2 1.5 R = 27Ω (RS-485), Figure 4 5 V Change in Magnitude of Driver Differential Output Voltage for Complementary △VOD R = 27Ω or 50Ω, Figure 4 0.2 V VOC R = 27Ω or 50Ω, Figure 4 3 V △VOD R = 27Ω or 50Ω, Figure 4 0.2 V Output States Driver Common-Mode Output Voltage Change in Magnitude of Driver Common-Mode Output Voltage for Complementary Output States Input High Voltage VIH DE, DI, RE Input Low Voltage VIL DE, DI, RE 0.8 V Input Current IIN1 DE, DI, RE , VCC floating ±2 µA Input Current (A, B) IIN2 Receiver Differential Threshold Voltage △VTH 2.0 DE = 0V; VIN = 12V 1.0 VCC = 0V or 5.25V VIN = -7V -0.8 -0.2 -7V≤VCM ≤12V Receiver Input Hysteresis VTH VCM = 0V Receiver Output High Voltage VOH IO = -4mA, VID = 200mV Receiver Output Low Voltage VOL IO = 4mA, VID = -200mV www.gmmicro.com Copyright © GATEMODE Corp. V 0.2 V mV 70 -2- mA V 3.5 0.4 V Tel: (+86) 13135660803 Email:sales@gmmicro.com GM488E/GM489E/GM490E/GM491E Low-Power,RS-485/RS-422 DC ELECTRICAL CHARACTERISTICS(continued) (VCC = 5V ±5%, TA = TMIN to TGM, unless otherwise noted.) (Notes 1, 2) PARAMETER Three-State (high impedance) Output Current at Receiver Receiver Input Resistance SYMBOL CONDITIONS IOZR 0.4V ≤ VO ≤ 2.4V RIN -7V≤VCM ≤12V MIN 3) ICC = High Driver Short-Circuit Current,VO = Low Receiver Short-Circuit Current UNIT ±1 µA kΩ 120 DE, DI, RE = 0V or VCC 250 µA GM490E/GM491E, 500 DE, DI, RE = 0V or VCC Driver Short-Circuit Current,VO MAX 96 GM488E/GM489E, No-Load Supply Current(Note TYP 600 IOSD1 -7V≤VCM ≤12V (Note 4) 35 250 mA IOSD2 -7V≤VCM ≤12V (Note 4) 35 250 mA IOSR 0V ≤ VO ≤ VCC 7 100 mA UNIT 4.3 SWITCHING CHARACTERISTICS—GM490E/GM491E (VCC = 5V ±5%, TA = TMIN to TGM, unless otherwise noted.) (Notes 1, 2) PARAMETER Driver Input to Output Driver Output Skew to Output SYMBOL tPLH tPHL tSKEW CONDITIONS Figure 6 and 8, RDIFF = 54Ω, CL1 = CL2 = 100pF tR, tF TYP MAX 10 30 60 10 30 60 5 10 Figure 6 and 8, RDIFF = 54Ω, CL1 = CL2 = 100pF Figure 6 and 8, Driver Rise or Fall Time MIN GM490E, GM491E 5 15 25 CL1 =CL2 = 100pF GM490E, GM491E 3 15 40 RDIFF= 54Ω, ns ns Driver Enable to Output High tZH Figure 7 and 9, CL = 100pF, S2 closed 40 70 ns Driver Enable to Output Low tZL Figure 7 and 9, CL = 100pF, S1 closed 40 70 ns Driver Disable Time from Low tLZ Figure 7 and 9, CL = 15pF, S1 closed 40 70 ns tHZ Figure 7 and 9, CL = 15pF, S2 closed 40 70 ns 20 90 150 20 90 200 Driver Disable Time from High Figure 6 and 10, GM490E, GM491E Receiver Input to Output tPLH, tPHL RDIFF = 54Ω, CL1=CL2=100pF | tPLH - tPHL | Differential Receiver Skew Receiver Enable to Output Low www.gmmicro.com Copyright © GATEMODE Corp. tSKD tZL GM490E, GM491E Figure 6 and 10, RDIFF = 54Ω, CL1 = CL2 = 100pF Figure 5 and 11, CRL = 15pF, S1 closed -3- 13 20 ns 50 ns Tel: (+86) 13135660803 Email:sales@gmmicro.com GM488E/GM489E/GM490E/GM491E Low-Power,RS-485/RS-422 SWITCHING CHARACTERISTICS—GM490E/GM491E(continued) (VCC = 5V ±5%, TA = TMIN to TGM, unless otherwise noted.) (Notes 1, 2) PARAMETER Receiver Enable to Output High Receiver Disable Time from Low Receiver Disable Time from High Maximum Data Rate SYMBOL CONDITIONS MIN TYP MAX UNIT tZH Figure 5 and 11, CRL = 15pF, S2 closed 20 50 ns tLZ Figure 5 and 11, CRL = 15pF, S1 closed 20 50 ns tHZ Figure 5 and 11, CRL = 15pF, S2 closed 20 50 ns fGM Mbps 2.5 4.4 SWITCHING CHARACTERISTICS—GM488E/GM489E (VCC = 5V ±5%, TA = TMIN to TGM, unless otherwise noted.) (Notes 1, 2) PARAMETER Driver Input to Output SYMBOL tPLH tPHL CONDITIONS Figure 6 and 8, RDIFF = 54Ω, CL1 = CL2 = 100pF MIN TYP MAX 250 800 2000 250 800 2000 100 800 ns UNIT ns Driver Output Skew to Output tSKEW Figure 6 and 8, RDIFF = 54Ω, CL1 = CL2 = 100pF Driver Rise or Fall Time tR, tF Figure 6 and 8, RDIFF = 54Ω, CL1 = CL2 = 100pF 250 2000 ns Driver Enable to Output High tZH Figure 7 and 9, CL = 100pF, S2 closed 250 2000 ns Driver Enable to Output Low tZL Figure 7 and 9, CL = 100pF, S1 closed 250 2000 ns Driver Disable Time from Low tLZ Figure 7 and 9, CL = 15pF, S1 closed 300 3000 ns Driver Disable Time from High tHZ Figure 7 and 9, CL = 15pF, S2 closed 300 3000 ns 250 2000 250 2000 Receiver Input to Output I tPLH - tPHL I Differential Receiver Skew Receiver Enable to Output Low Receiver Enable to Output High Receiver Disable Time from Low Receiver Disable Time from High Maximum Data Rate tPLH tPHL Figure 6 and 10, RDIFF = 54Ω,CL1 =CL2 = 100pF 100 ns tSKD Figure 6and 10, RDIFF = 54Ω,CL1 =CL2 = 100pF tZL Figure 5 and 11, CRL = 15pF, S1 closed 20 50 ns tZH Figure 5 and 11, CRL = 15pF, S2 closed 20 50 ns tLZ Figure 5 and 11, CRL = 15pF, S1 closed 20 50 ns tHZ Figure 5 and 11, CRL = 15pF, S2 closed 20 50 ns fGM tPLH, tPHL < 50% of data period 250 ns kbps 4.5 NOTES FOR ELECTRICAL/SWITCHING CHARACTERISTICS Note 1: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device ground unless otherwise specified. Note 2: All typical specifications are given for VCC = 5V and TA = +25°C. Note 3: Supply current specification is valid for loaded transmitters when DE = 0V. Note 4: Applies to peak current. See Typical Operating Characteristics. www.gmmicro.com Copyright © GATEMODE Corp. -4- Tel: (+86) 13135660803 Email:sales@gmmicro.com GM488E/GM489E/GM490E/GM491E Low-Power,RS-485/RS-422 4.6 Pin Description PIN GM488E/ GM490E GM489E/ GM491E NAME SOP8 MSOP8 SOP14 2 4 2 RO — — 3 RE FUNCTION Receiver Output: If A > B by 200mV, RO will be high; If A < B by 200mV, RO will be low. Receiver Output Enable. RO is enabled when RE is low; RO is high impedance when RE is high. Driver Output Enable. The driver outputs, Y and Z, are enabled by bringing DE high. They are high impedance when — — 4 DE DE is low. If the driver outputs are enabled, the parts function as line drivers. While they are high impedance, they function as line receivers if RE is low. Driver Input. A low on DI forces output Y low and output Z 3 5 5 DI high. Similarly, a high on DI forces output Y high and output Z low. 4 6 6, 7 GND 5 7 9 Y Non-inverting Driver Output 6 8 10 Z Inverting Driver Output — — — A 8 2 12 A Non-inverting Receiver Input — — — B Inverting Receiver Input and Inverting Driver Output 7 1 11 B Inverting Receiver Input 1 3 14 VCC Positive Supply: 4.75V ≤ VCC ≤ 5.25V — — 1, 8, 13 N.C. No Connect—not internally connected www.gmmicro.com Copyright © GATEMODE Corp. Ground Non-inverting Receiver Input and Non-inverting Driver Output -5- Tel: (+86) 13135660803 Email:sales@gmmicro.com GM488E/GM489E/GM490E/GM491E Low-Power,RS-485/RS-422 Figure 2. GM488E/GM490E Pin Configuration and Typical Operating Circuit Figure 3. GM489E/GM491E Pin Configuration and Typical Operating Circuit www.gmmicro.com Copyright © GATEMODE Corp. -6- Tel: (+86) 13135660803 Email:sales@gmmicro.com GM488E/GM489E/GM490E/GM491E Low-Power,RS-485/RS-422 5. Applications Information The GM488E/GM489E/GM490E and GM491E are low-power transceivers for RS-485 and RS- 422 communications. The GM490E and GM491E can transmit and receive at data rates up to 2.5Mbps, while the GM488E and GM489E are specified for data rates up to 1Mbps. The GM488E–GM491E are full-duplex transceivers. In addition, Driver Enable (DE) and Receiver Enable (RE) pins are included on the GM489E and GM491E. When disabled, the driver and receiver outputs are high impedance. 6. ±15kV ESD Protection ESD-protection structures are incorporated on all pins to protect against electrostatic discharges (ESD) encountered during handling and assembly. The driver outputs and receiver inputs have extra protection against static electricity. The ESD structures withstand high ESD in all states: normal operation, shutdown, and powered down. After an ESD event, GM488E–GM491E keep working without latch up. ESD protection can be tested in various ways; the transmitter outputs and receiver inputs of this product family are characterized for protection to ±15kV using the Human Body Model. Other ESD test methodologies include IEC10004-2 contact discharge and IEC1000-4-2 air-gap discharge. 7. Transceivers on the Bus The 96kΩ, 1/8-unit-load receiver input impedance of the GM488E–GM491E allow up to 256 transceivers on a bus, compared to the 1-unit load (12kΩ input impedance) of standard RS-485 drivers (32 transceivers Maximum). 8. Test Circuits Figure 4. Driver DC Test Load Figure 5. Receiver Timing Test Load Figure 6. Driver/Receiver Timing Test Circuit Figure 7. Driver Timing Test Load www.gmmicro.com Copyright © GATEMODE Corp. -7- Tel: (+86) 13135660803 Email: sales@gmmicro.com GM488E/GM489E/GM490E/GM491E Low-Power,RS-485/RS-422 9. Reduced EMI and Reflections The GM488E and GM489E are slew-rate limited, minimizing EMI and reducing reflections caused by improperly terminated cables. 10. Switching Waveform Figure 8. Driver Propagation Delays Figure 9. Driver Enable and Disable Times (except GM488E and GM490E) Figure 10. Receiver Propagation Delays Figure 11. Receiver Enable and Disable Times (except GM488E and GM490E) www.gmmicro.com Copyright © GATEMODE Corp. -8- Tel: (+86) 13135660803 Email: sales@gmmicro.com GM488E/GM489E/GM490E/GM491E Low-Power,RS-485/RS-422 11. Function Tables (GM483/GM485/GM487) Table 1. Transmitting INPUTS OUTPUTS Table 2. Receiving INPUTS OUTPUT RE DE DI Z Y RE DE A-B RO X 1 1 0 1 0 0 > +0.2V 1 X 1 0 1 0 0 0 < -0.2V 0 0 0 X High-Z High-Z 0 0 Inputs open 1 1 0 X High-Z* High-Z* 1 0 X High-Z* X = Don’t care High-Z = High impedance *Shutdown mode for GM481/GM483/GM487 X = Don’t care High-Z = High impedance *Shutdown mode for GM481/GM483/GM487 12. Driver Output Protection Excessive output current and power dissipation causedby faults or by bus contention are prevented by two mechanisms. A current limit on the output stage provides immediate protection against short circuits over the whole common-mode voltage range. In addition, a thermal shutdown circuit forces the driver outputs into a high-impedance state if the die temperature rises excessively. 13. Propagation Delay Many digital encoding schemes depend on the difference between the driver and receiver propagation delay times. Typical propagation delays are shown in Figure 13–17 using Figure 12 test circuit. The difference in receiver delay times, | tPLH - tPHL |, is typically under 13ns for GM490E and GM491E, is typically less than 100ns for the GM488E and GM489E. The driver skew times are typically 5ns (10ns Max) for the GM490E and GM491E, and are typically 100ns (800ns Max) for the GM488E and GM489E. Figure 12. Receiver Propagation Delay Test Circuit www.gmmicro.com Copyright © GATEMODE Corp. -9- Tel: (+86) 13135660803 Email: sales@gmmicro.com GM488E/GM489E/GM490E/GM491E Low-Power,RS-485/RS-422 Figure 13. GM490E/GM491E Receiver tPHL Figure 14.GM490E/GM491E Receiver tPLH Figure 15.GM488E–GM489E Receiver tPHL Figure 16.GM488E–GM489E Receiver tPLH www.gmmicro.com Copyright © GATEMODE Corp. - 10 - Tel: (+86) 13135660803 Email: sales@gmmicro.com GM488E/GM489E/GM490E/GM491E Low-Power,RS-485/RS-422 14. Typical Applications The GM488E–GM491E transceivers are designed for bidirectional data communications on multi point bus transmission lines. Figure 18 and 19 show typical network applications circuits. These parts can also be used as line repeaters, with cable lengths longer than 4000 feet, as shown in Figure 20. To minimize reflections, the line should be terminated at both ends in its characteristic impedance, and stub lengths off the main line should be kept as short as possible. The slew-rate-limited GM483 and GM488E–GM489E are more tolerant of imperfect termination. Bypass the VCC pin with 0.1µF Figure 17.GM490E/GM491E System Differential Voltage at 110kHz Driving 4000ft of Cable Figure 18.GM488E–GM489E System Differential Voltage at 110kHz Driving 4000ft of Cable Figure 19. GM488E–GM491E Full-Duplex RS-485 Network Figure 20. Line Repeater for GM488E–GM491E www.gmmicro.com Copyright © GATEMODE Corp. - 11 - Tel: (+86) 13135660803 Email: sales@gmmicro.com GM488E/GM489E/GM490E/GM491E Low-Power,RS-485/RS-422 SOP-8L SYMBOLS MILLIMETER MIN NOM MAX A 1.5 - 1.7 A1 0.1 - 0.25 A2 1.3 1.4 1.5 b 0.33 0.4 0.47 C 0.2 - 0.25 D 4.7 4.9 5.1 E 5.9 6 6.1 E1 3.8 3.9 4 e 1.27(BSC) L 0.55 0.6 0.75 L1 1.05(BSC) θ 0° 4° 8° www.gmmicro.com Copyright © GATEMODE Corp. - 12 - Tel: (+86) 13135660803 Email: sales@gmmicro.com GM488E/GM489E/GM490E/GM491E Low-Power,RS-485/RS-422 SOP-14 SYMBOLS MILLIMETER MIN NOM MAX A - - 1.75 A1 0.05 - 0.225 A2 1.30 1.40 1.50 A3 0.60 0.65 0.70 b 0.39 - 0.47 b1 0.38 0.41 0.44 c 0.20 - 0.24 c1 0.19 0.20 0.21 D 8.55 8.65 8.75 E 5.80 6.00 6.20 E1 3.80 3.90 4.00 e 1.24BSC h 0.25 - 0.50 L 0.50 - 0.80 L1 θ www.gmmicro.com Copyright © GATEMODE Corp. 1.05REF 0° - - 13 - 8° Tel: (+86) 13135660803 Email: sales@gmmicro.com GM488E/GM489E/GM490E/GM491E Low-Power,RS-485/RS-422 Order Information Order number Package Marking information Operation Temperature MSL Grade Ship, Quantity Green Range GM488ESA SOP8 GM488E -40 to 85°C 3 T&R, 2500 Rohs GM488EMA MSOP8 GM488E -40 to 85°C 3 T&R, 2500 Rohs GM490ESA SOP8 GM490E -40 to 85°C 3 T&R, 2500 Rohs GM490EMA MSOP8 GM490E -40 to 85°C 3 T&R, 2500 Rohs GM489ESA SOP14 GM489E -40 to 85°C 3 T&R, 2500 Rohs GM491ESA SOP14 GM491E -40 to 85°C 3 T&R, 2500 Rohs www.gmmicro.com Copyright © GATEMODE Corp. - 14 - Tel: (+86) 13135660803 Email: sales@gmmicro.com GM488E/GM489E/GM490E/GM491E Low-Power,RS-485/RS-422 Version modification record version Modify the description page time Modify personnel On June 21,2024 Fan 1.Original:GM490_1.0 →GM490_1.1 2.Input Current testing environment.Increase the VCC 1.1 Floating 3.Receiver Short-Circuit Current MAX=95mA → MAX= 100mA www.gmmicro.com Copyright © GATEMODE Corp. - 15 - 2 3 Tel: (+86) 13135660803 Email: sales@gmmicro.com