SP485 LEIDITECH | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 10
Technical content
Features
- The I/O pins are protected against electrostatic discharge: ±15kV HBM All other pins are protected against 3 levels of electrostatic discharge (ESD): ±8kV HBM
- up to 256 devices on the bus
- +5V operating voltage (+3.3V supply, transmission rate maximum recommended 500Kbps).
- With slope limiting function, the maximum data rate is 2Mbps
- Weak current shutdown mode operating current: 1nA
- Current limiting and thermal shutdown for driver overload protection
- Package ： SOP8, DIP8 Application
- Smart Instrumentation
- Industrial process control
- Building automation networks
- Motor control
- EMI sensitive transceiver applications
Ordering information
Type Package Packaging MPQ SP485 SOP8 Reels 2500PCS RS-485 RS422 Transceiver SP485
Pins Symbol Function attribute 1 RO Receiver output: IF A-B ≥-0.05V, RO is high; IF A-B ≤-0.2V, RO is low; IF A and B are dangling or short, RO is also high. O RE Receiver output enable: WHEN RE is low, RO is enabled; When RE is high, RO is at high impedance. I 3 DE Driver output enable: Enable DE higher, the output of the driver, Y and Z, are enabled; they are at high impedance w hen DE ar e low. I 4 DI Driver input: DI is low, A is low, B is high; DI is high, A is high, B is low; I
5 GND Earth
6 A The input of the receiver and the output of the driver. I/O 7 B The input of the receiver and the output of the driver. I/O
8 VDD Power supply
The SP485 high speed half-duplex transceiver consists of a driver and receiver with a 1/8 unit load input impedance and up to 256 transceivers on the bus. RECEIPT Input Output RE DE A - B RO L X ≥-0.05V H L X ≤-0.2V L L X Open/shorted H H H X Z H L X Z TRANSMISSION Input Output RE DE DI B A X H H L H X H L H L L L X Z Z H L X Z Absolute Maximum Ratings Unless otherwise specified, Tamb = 25 °C Parameter Symbol Value Unit Supply voltage VDD -0.3~7 V Limit input/output voltage VIN/VOUT GND- 0.3~VDD+0.3 V A/B limit input/output voltage VIN A/B/VOUT A/B -13~13 V Operating ambient temperature Tamb -40~85 ℃ Storage temperature Tstg -65~150 ℃ SP485
DC electrical characteristics (VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2) PARAMETER SYMBOL CONDITIONS MIN TYP MA X UNITS Differential Driver Output (no load) VOD1 5 V R = 50Ω (RS-422) (1) 2 Differential Driver Output (with load) VOD2 V Change in Magnitude of Driver Differential Output Voltage for Complementary Output States OD R = 27Ω or 50Ω (1) 0.2 V Driver Common-Mode Output Voltage V OC R = 27Ω or 50Ω (1) 3 V Change in Magnitude of Driver Common-Mode Output Voltage for Complementary Output States ∆VOC R = 27Ω or 50Ω (1) 0.2 V Input High Voltage VIH1 DE, DI, RE 2.0 V Input Low Voltage VIL1 DE, DI, RE 0.8 V Input Current IIN1 DE, DI, RE ±2 µA VIN = 12V 125 Input Current (A, B) IIN2 DE = 0V; VCC = 0V or 5.25V, V IN = -7V -75 Receiver Differential Threshold Voltage VTH -7V ≤ VCM ≤12V --0.2 -0.05 V Receiver Input Hysteresis ∆VTH 25 mV Receiver Output High Voltage VOH O I= -4mA, V ID = -50mV 3.5 V Receiver Output Low Voltage VOL O I= 4mA, V ID = -200mV 0.4 V Three-State (high impedance) Output Current at Receiver I OZR 0.4V ≤ VO ≤ 2.4V ±1 µA Receiver Input Resistance RIN -7V ≤ VCM ≤ 12V kΩ PARAMETER SYMBOL CONDITIONS MIN TYP MA X UNITS 0.01 0.01 µA IOD1 -7V≤V OUT ≤VDD - 250 mA 0V≤V OUT ≤12V 250 mA ≤VOUT ≤VDD ±25 mA Driver Output Short-Circuit Current Receiver Short-Circuit Current I OSR 0V ≤ VO ≤ VCC ±7 ±95 mA DE = VDD 430 900 DE=GND 375 600 No-Load Supply Current ICC µA µA No Load RE=DI=GND or VDD SP485
Transmission characteristics Unless otherwise specified, V DD = 5V 5% and Tamb = 25 °C Features slope limiting Drive input to Output tDPLH RDIFF=54Ω， CL1=CL2=100pF(2) 250 720 1000 ns Drive input to Output tDPHL RDIFF=54Ω， CL1=CL2=100pF(2) 250 720 1000 ns |tDPLH-tDPHL| tDSKEW RDIFF=54Ω， CL1=CL2=100pF(2) -3 ±100 ns Drive up and down Time tDR,tDF RDIFF=54Ω， CL1=CL2=100pF(2) 200 530 750 ns Maximum data transfer rate fMAX 2000 kbps Drive enable delay tDZH CL=100pF,S2 CLOSED(3) 2500 ns Drive enable delay tDZL CL=100pF,S1 CLOSED(3) 2500 ns Drive shutdown delay tDLZ CL=15pF,S1 CLOSED(3) 100 ns Drive shutdown delay tDHZ CL=15pF,S2 CLOSED(3) 100 ns Receiver input and output Delay tRPLH | VID|≥2.0V Rise and fall time ≤ 15ns(4). 127 200 ns Receiver input and output Delay tRPHL 127 200 ns |tRPLH-tRPHL| tRSKD | VID|≥2.0V Rise and fall time ≤ 15ns(4). 3 ±30 ns Receiver enable delay tRZL CL=100pF,S1 CLOSED(5) 20 50 ns Receiver enable delay tRZH CL=100pF,S2 CLOSED(5) 20 50 ns Receiver shutdown delay tRLZ CL=100pF,S1 CLOSED(5) 20 50 ns Receiver shutdown delay tRHZ CL=100pF,S2 CLOSED(5) 20 50 ns Shutdown mode enable time tSHDN 50 200 600 ns Drive wake delay tDZH(SHDN) CL=15pF,S2 CLOSED(3) 4500 ns Drive wake delay tDZL(SHDN) CL=15pF,S1 CLOSED(3) 4500 ns Receiver wake-up delay tRZH(SHDN) CL=100pF,S2 CLOSED(5) 3500 ns Receiver wake-up delay tRZL(SHDN) CL=100pF,S1 CLOSED(5) 3500 ns PARAMETER SYMBOL CONDITIONS MIN TYP MA X UNITS SP485
Continued from the previous page.... Infinite slope function Drive input to input Out of the delay tDPLH RDIFF=54 Ω,CL1=CL2=100pF(2) 34 60 ns Drive input to input Out of the delay tDPHL 34 60 |tDPLH-tDPHL| tDSKEW -2.5 ns Drive up and down Time tDR, tDF 14 25 ns Maximum data transfer rate fMAX 2 Mbps Drive enable delay tDZH CL=100pF,S2 CLOSED(3) 150 ns Drive enable delay tDZL CL=100pF,S1 CLOSED(3) 150 ns Drive shutdown delay tDLZ CL=15pF,S1 CLOSED(3) 100 ns Drive shutdown delay tDHZ CL=15pF,S2 CLOSED(3) 100 ns Receiver input and output Delay tRPLH | VID|≥2.0V Rise and fall time ≤ 15ns(4). 106 150 ns Receiver input and output Delay tRPHL 106 150 ns |tRPLH-tRPHL| tRSKD | VID|≥2.0V Rise and fall time ≤ 15ns(4). 0 ±10 ns Receiver enable delay tRZL CL=100pF,S1 CLOSED(5) 20 50 ns Receiver enable delay tRZH CL=100pF,S2 CLOSED(5) 20 50 ns Receiver shutdown delay tRLZ CL=100pF,S1 CLOSED(5) 20 50 ns Receiver shutdown delay tRHZ CL=100pF,S2 CLOSED(5) 20 50 ns Shutdown mode enable time tSHDN 50 200 600 ns Drive wake delay tDZH(SHDN) CL=15pF,S2 CLOSED(3) 250 ns Drive wake delay tDZL(SHDN) CL=15pF,S1 CLOSED(3) 250 ns Receiver wake-up delay tRZH(SHDN) CL=100pF,S2 CLOSED(5) 3500 ns Receiver wake-up delay tRZL(SHDN) CL=100pF,S1 CLOSED(5) 3500 ns concentrate: (1) The test circuit is shown in Figure 1 (2) The test line is shown in Figure 2 (3) The test circuit is shown in Figure 3 (4) The test circuit is shown in Figure 4 (5) The test line is shown in Figure 5 PARAMETER SYMBOL CONDITIONS MIN TYP MA X UNITS RDIFF=54 Ω,CL1=CL2=100pF(2) RDIFF=54 Ω,CL1=CL2=100pF(2) RDIFF=54 Ω,CL1=CL2=100pF(2) SP485 ±10
（mm） Max Marking Min Max A 4.95 5.15 C3 0.10 0.20 A1 0.37 0.47 C4 0.20TYP A2 1.27TYP D 1.05TYP A3 0.41TYP D1 0.50TYP B 5.80 6.20 R1 0.07TYP B1 3.80 4.00 R2 0.07TYP B2 5.0TYP 1 17TYP C 1.30 1.50 2 13TYP C1 0.55 0.65 3 4TYP C2 0.55 0.65 4 12TYP SP485
A 9.30 9.50 C2 0.50 A1 1.524 C3 3.3 A2 0.39 0.53 C4 1.57TYP A3 2.54 D 8.20 8.80 A4 0.66TYP D1 0.20 0.35 A5 0.99TYP D2 7.62 7.87 B 6.3 6.5 1 8TYP C 7.20 2 8TYP C1 3.30 3.50 3 5TYP Marking Min Max Marking Min Max SP485 Shanghai Leiditech Electronic Co.,Ltd Email: sale1@leiditech.com Tel : +86- 021 50828806 Fax : +86- 021 50477059