SLLS897E March 2008 – June 2015 ISO1176
The ISO1176 is an isolated half-duplex differential line transceiver that meets the requirements of EN 50170 and TIA/EIA 485/422 applications. The device is rated to provide galvanic isolation of up to 2500 VRMS for 60 s per UL 1577. The device has active-high driver enable and active-low receiver enable functions to control the data flow. The device has maximum data transmission speed of 40 Mbps.
When the driver enable pin, DE, is logic high, the differential outputs A and B follow the logic states at data input D. A logic high at D causes A to turn high and B to turn low. In this case, the differential output voltage defined as VOD = V(A) – V(B) is positive. When D is low, the output states reverse, B turns high, A becomes low, and VOD is negative. When DE is low, both outputs turn high-impedance. In this condition, the logic state at D is irrelevant. The DE pin has an internal pulldown resistor to ground, thus when left open the driver is disabled (high-impedance) by default. The D pin has an internal pullup resistor to VCC, thus, when left open while the driver is enabled, output A turns high and B turns low.
When the receiver enable pin, RE, is logic low, the receiver is enabled. When the differential input voltage defined as VID = V(A) – V(B) is positive and higher than the positive input threshold, VIT+, the receiver output, R, turns high. When VID is negative and less than the negative and lower than the negative input threshold, VIT– , the receiver output, R, turns low. If VID is between VIT+ and VIT– the output is indeterminate. When RE is logic high or left open, the receiver output is high-impedance and the magnitude and polarity of VID are irrelevant. Internal biasing of the receiver inputs causes the output to go failsafe-high when the transceiver is disconnected from the bus (open-circuit), the bus lines are shorted (short-circuit), or the bus is not actively driven (idle bus).
|L(I01)||Minimum air gap (Clearance)||Shortest terminal-to-terminal distance through air||8.34||mm|
|L(I02)||Minimum external tracking (Creepage)(1)||Shortest terminal-to-terminal distance across the package surface||8.1||mm|
|CTI||Tracking resistance (Comparative Tracking Index)||DIN IEC 60112 / VDE 0303 Part 1||≥400||V|
|Minimum internal gap (Internal Clearance)||Distance through the insulation||0.008||mm|
|RIO||Isolation resistance||Input to output, VIO = 500 V, TA = 25°C, all pins on each side of the barrier tied together creating a 2-terminal device||>1012||Ω|
|CIO||Barrier capacitance Input to output||VI = 0.4 sin (4E6πt)||2||pF|
|CI||Input capacitance to ground||VI = 0.4 sin (4E6πt)||2||pF|
|VIOTM||Transient overvoltage||t = 60 s||4000||VPK|
|VIORM||Maximum working insulation voltage||560||VPK|
|VPR||Input to output test voltage||Method b1, VPR = VIORM × 1.875, 100% Production test with t = 1 s, Partial discharge <5 pC||1050||VPK|
|RS||Insulation resistance||VIO = 500 V at TS||>109||Ω|
|Basic isolation group||Material group||II|
|Installation classification||Rated mains voltage < 150 VRMS||I-IV|
|Rated mains voltage < 300 VRMS||I-III|
Safety limiting intends to prevent potential damage to the isolation barrier upon failure of input or output circuitry. A failure of the I/O can allow low resistance to ground or the supply and, without current-limiting, dissipate sufficient power to overheat the die and damage the isolation barrier potentially leading to secondary system failures.
|IS||Safety input, output, or supply current||DW-16||RθJA = 168°C/W, VI = 5.5 V, TJ = 170°C,
TA = 25°C
|TS||Maximum case temperature||DW-16||150||°C|
The safety-limiting constraint is the absolute maximum junction temperature specified in Absolute Maximum Ratings. The power dissipation and junction-to-air thermal impedance of the device installed in the application hardware determines the junction temperature. The assumed junction-to-air thermal resistance in Thermal Information is that of a device installed in the JESD51-3, Low Effective Thermal Conductivity Test Board for Leaded Surface Mount Packages and is conservative.
The power is the recommended maximum input voltage times the current. The junction temperature is then the ambient temperature plus the power times the junction-to-air thermal resistance..
|Certified according to DIN V VDE V 0884-10 (VDE V 0884-10):2006-12||Approved under CSA Component Acceptance Notice 5A and IEC 60950-1||Recognized under UL 1577 Component Recognition Program(1)|
4000 VPK Maximum transient overvoltage,
560 VPK Maximum working voltage
|4000 VPK Isolation rating,
560 VPK Basic working voltage per CSA 60950-1-07 and IEC 60950-1 (2nd Ed)
|Single Protection, 2500 VRMS|
|Certificate number: 40016131||Master contract number: 220991||File number: E181974|
|ENABLE OUTPUT (ISODE)||OUTPUTS|
|PU||PU||H or open||H||H||H||H||L|
|PU||PU||H or open||L||H||H||L||H|
|PU||PU||H or open||X||L||L||Z||Z|
|PU||PU||H or open||X||open||L||Z||Z|
|PU||PU||H or open||open||H||H||H||L|
VID = (VA – VB)
|PU||PU||H or open||–0.01 V ≤ VID||L||H|
|PU||PU||H or open||–0.2 V < VID < –0.01 V||L||?|
|PU||PU||H or open||VID ≤ –0.2 V||L||L|
|PU||PU||H or open||X||H||Z|
|PU||PU||H or open||X||open||Z|
|PU||PU||H or open||Open-circuit||L||H|
|PU||PU||H or open||Short-circuit||L||H|
|PU||PU||H or open||Idle (terminated) bus||L||H|
|PU||PD||H or open||X||L||H|