ST4485EBDR

ST4485EB 3.3 V powered, 15 kV ESD protected, up to 20 Mbps RS-485/ RS-422 transceiver Datasheet - production data  Guaranteed high receiver output state for floating inputs with no signal present  Allow up to 64 transceivers on the bus  Wide operating temperature range: -40 to +105 °C Applications SO-8  Industrial systems control  Telecommunications Features Description  ESD protection – ± 15 kV human body model – ± 8 kV IEC 1000-4-2 contact discharge The ST4485EB device is a ± 15 kV ESD protected, 3.3 V low power transceiver for RS-485 and RS-422 communications. The device contains one driver and one receiver in half duplex configuration.  Operate from a single 3.3 V supply - no charge pump required  Interoperable with 5 V logic  1 µA low current shutdown mode max. The ST4485EB transmits and receives at a guaranteed data rate of at least 20 Mbps. All transmitter outputs and receiver inputs are protected to ± 15 kV using “Human Body Model”.  Guaranteed 20 Mbps data rate  -7 to 12 V common mode input voltage range  Half duplex versions available  Industry standard 75176 pinout  Current limiting and thermal shutdown for driver overload protection The driver is short-circuit current limited and is protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-impedance state. Table 1. Device summary Order code Temperature range Package Packaging ST4485EBDR -40 to 105 °C SO-8 (tape and reel) 2500 parts per reel June 2017 This is information on a product in full production. DocID025158 Rev 3 1/18 www.st.com Contents ST4485EB Contents 1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Test circuits and typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2/18 DocID025158 Rev 3 ST4485EB 1 Pin configuration Pin configuration Figure 1. Pin connections  9&&   % '(   $ ',   *1' 52  5( 5 ' &6 Table 2. Pin description Pin n° Symbol Name and function 1 RO Receiver output. If A > B by 200 mV, RO will be high; if A < B by 200 mV, RO will be low. 2 RE Receiver output enable. RO is enabled when RE is low; RO is high impedance when RE is high. If RE is high and DE is low, the device will enter a low power shutdown mode. 3 DE Driver output enable. The driver outputs are enabled by bringing DE high. They are high impedance when DE is low. If RE is high DE is low, the device will enter a low-power shutdown mode. If the driver outputs are enabled, the part functions as line driver, while they are high impedance, it functions as line receivers if RE is low. 4 DI Driver input. A low on DI forces output A low and output B high. Similarly, a high on DI forces output A high and output B low. 5 GND 6 A Non-inverting receiver input and non-inverting driver output 7 B Inverting receiver input and inverting driver output 8 VCC Ground Supply voltage: VCC = 3 V to 3.6 V DocID025158 Rev 3 3/18 18 Truth tables 2 ST4485EB Truth tables Table 3. Truth table (driver) Inputs Outputs Mode RE DE DI B A X(1) H H L H Normal (1) H L H L Normal L X(1) Z (2) Z (2) Normal L (1) Z (2) Z (2) Shutdown X L H X 1. X = don’t care. 2. Z = high impedance. Table 4. Truth table (receiver) Inputs Output Mode RE DE A-B RO L L  0.2 V H Normal L L  -0.2 V L Normal L L Inputs open H Normal Z(2) Shutdown H L (1) X 1. X = don’t care. 2. Z = high impedance. 4/18 DocID025158 Rev 3 ST4485EB 3 Maximum ratings Maximum ratings Table 5. Absolute maximum ratings(1) Symbol VCC Parameter Supply voltage Value Unit 7 V VI Control input voltage (RE, DE) -0.3 to 7 V VDI Driver input voltage (DI) -0.3 to 7 V VDO Driver output voltage (A, B) ± 14 V VRI Receiver input voltage (A, B) ± 14 V VRO Receiver output voltage (RO) -0.3 to (VCC + 0.3) V 1. Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Table 6. ESD performance: transmitter outputs, receiver inputs Symbol Parameter Test conditions Min. Typ. Max. Unit ESD ESD protection voltage Human body model 15 kV ESD ESD protection voltage IEC-1000-4-2 contact discharge 8 kV DocID025158 Rev 3 5/18 18 Electrical characteristics 4 ST4485EB Electrical characteristics Table 7. Electrical characteristics (VCC = 3 V to 3.6 V, TA = -40 to 105 °C, unless otherwise specified. Typical values are referred to TA = 25 °C) Symbol ISUPPLY ISHDN Parameter VCC power supply current Shutdown supply current Test conditions No load, DI = 0 V or VCC Min. Typ. Max. Unit DE = VCC, RE = 0 V or VCC 1.3 2.2 mA DE = 0 V, RE = 0 V 1.2 1.9 mA 0.002 1 µA DE = 0 V, RE = VCC, DI = 0 V or VCC Table 8. Logic input electrical characteristics (VCC = 3 V to 3.6 V, TA = -40 to 105 °C, unless otherwise specified. Typical values are referred to TA = 25 °C) Symbol Parameter Test conditions VIL Input logic threshold low DE, DI, RE VIH Input logic threshold high DE, DI, RE IIN1 Logic input current DE, DI, RE IIN2 Input current (A, B) DE = 0 V, VCC = 0 or 3.6 V Min. Typ. Max. Unit 1.3 0.8 2 V V 2.0 µA VIN = 12 V 1 mA VIN = -7 V -0.8 mA Table 9. Transmitter electrical characteristics (VCC = 3 V to 3.6 V, TA = -40 to 105 °C, unless otherwise specified. Typical values are referred to TA = 25 °C) Symbol VOD VOD Differential drive output Test conditions Min. RL= 100  (RS-422) (Figure 1) 2 V RL= 54  (RS-485) (Figure 1) 1.5 V RL= 60  (RS-485) (Figure 2) 1.5 V Change in magnitude of driver differential output voltage for complementary output RL= 54  or 100 (Figure 1) states (1) Typ. Max. Unit 0.2 V Driver common mode output voltage RL= 54  or 100 (Figure 1) 3 V VOC Change in magnitude of driver common mode output voltage(1) RL= 54  or 100 (Figure 1) 0.2 V IOSD Driver short-circuit output current 250 mA VOC 1. Parameter VOD and VOC are the changes in VOD and VOC, respectively, when the DI input changes state. 6/18 DocID025158 Rev 3 ST4485EB Electrical characteristics Table 10. Receiver electrical characteristics (VCC = 3 V to 3.6 V, TA = -40 to 105 °C, unless otherwise specified. Typical values are referred to TA = 25 °C) Symbol Parameter Test conditions Min. Typ. Max. Unit 0.2 V Receiver differential threshold voltage VCM = -7 V to 12 V, DE = 0 VTH Receiver input hysteresis VCM = 0 V VOH Receiver output high voltage IOUT = -4 mA, VID = 200 mV (Figure 8 and Figure 9) VOL Receiver output low voltage IOUT = 4 mA, VID = -200 mV, (Figure 3) 0.4 V IOZR 3-state (high impedance) output current at receiver VCC = 3.6 V, VO = 0 V to VCC 1 µA RRIN Receiver input resistance VCM = -7 V to 12 V 24 IOSR Receiver short-circuit current VRO = 0 V to VCC 7 VTH -0.2 70 mV 2 V k 60 mA Table 11. Driver switching characteristics (VCC = 3 V to 3.6 V, TA = -40 to 105 °C, unless otherwise specified. Typical values are referred to TA = 25 °C)(1) Symbol Parameter Test conditions Min. Typ. Max. Unit DR Maximum data rate tDD Differential output delay RL= 60 , CL = 15 pF, (Figure 4 and Figure 5) 18 30 ns tTD Differential output transition time RL= 60 , CL = 15 pF, (Figure 4 and Figure 5) 12 20 ns tPLH tPHL Propagation delay RL= 27 , CL = 15 pF, (Figure 8 and Figure 9) 18 30 ns tPDS |tPLH - tPHL| Propagation delay skew(2) RL= 27 , CL = 15 pF, (Figure 8 and Figure 9) 2 5 ns tPZL Output enable time RL= 110 , (Figure 10 and Figure 11) 19 35 ns tPZH Output enable time RL= 110 , (Figure 6 and Figure 7) 30 50 ns tPHZ Output disable time RL= 110 , (Figure 6 and Figure 7) 19 35 ns tPLZ Output disable time RL= 110  (Figure 10 and Figure 11) 30 50 ns 20 Mbps tSKEW Differential output delay skew 1 3 ns tZH(SHDN) Driver enable from shutdown to output high 30 50 ns tZL(SHDN) Driver enable from shutdown to output low 19 35 ns 1. The transceivers are put into shutdown by bring RE high and DE low. If the input are in state for less than 80 ns, the part are guaranteed not to enter shutdown. If the inputs are in this state for at least 300 ns, the parts are guaranteed to have entered shutdown. 2. Measured on |tPLH(A) - tPHL(A)| and |tPLH(B) - tPHL(B)|. DocID025158 Rev 3 7/18 18 Electrical characteristics ST4485EB Table 12. Receiver switching characteristics (VCC = 3 V to 3.6 V, TA = -40 to 105 °C, unless otherwise specified. Typical values are referred to TA = 25 °C)(1) Symbol tPLH tPHL Parameter Test conditions Min. Typ. Max. Unit Propagation delay VID = 0 V to 3 V, CL1 = 15 pF (Figure 12 and Figure 13) 30 50 ns |tPLH - tPHL| Propagation delay skew VID = 0 V to 3 V, CL1 = 15 pF (Figure 12 and Figure 13) 1 3 ns tPZL Output enable time CRL = 15 pF, (Figure 14 and Figure 18) 10 20 ns tPZH Output enable time CRL = 15 pF, (Figure 14 and Figure 18) 10 20 ns tPHZ Output disable time CRL = 15 pF, (Figure 14 and Figure 18) 10 20 ns tPLZ Output disable time CRL = 15 pF, (Figure 14 and Figure 18) 10 20 ns tZH(SHDN) Receiver enable from shutdown to output high CRL = 15 pF, (Figure 14 and Figure 18) 10 20 ns tZL(SHDN) Receiver enable from shutdown to output low CRL = 15 pF, (Figure 14 and Figure 18) 20 40 µs tRPDS 1. The transceivers are put into shutdown by bring RE high and DE low. If the input are in state for less than 80 ns, the part are guaranteed not to enter shutdown. If the inputs are in this state for at least 300 ns, the parts are guaranteed to have entered shutdown. 8/18 DocID025158 Rev 3 ST4485EB 5 Test circuits and typical characteristics Test circuits and typical characteristics Figure 2. Driver and VOC test load 5/ '  92' 5/ 9&&  92& &6 Figure 3. Driver VOD with varying common mode voltage test load 9&0 WR9 ' 92' 5/ 9&& &69 Figure 4. Receiver VOH and VOL test circuit 9,' 9 5 92/ ,2/  92+ ,2+  &6 DocID025158 Rev 3 9/18 18 Test circuits and typical characteristics ST4485EB Figure 5. Drive differential output delay transition time test circuit ,QSXW ' 287 &/ 9&& &/ S) &69 Figure 6. Drive differential output delay transition time waveform 9 ,1 9 9 9 W'2 W'2  287 9      W7' 9 W7' &6 Figure 7. Drive enable and disable times test circuit 6 9RU9 287 ' &/ S) &69 10/18 DocID025158 Rev 3 ST4485EB Test circuits and typical characteristics Figure 8. Drive enable and disable times waveforms 9 9 ,1 9 9 W3=+ W3+= 9 92+ 920 287 9 &69 Figure 9. Drive propagation time test circuit 920 6 ' 287 &/ S) 9&& &69 Figure 10. Drive propagation time waveform 9 ,1 9 9 9 W3/+ W3+/ 92+