AEIC-2631-S16 Quad D ierff ential Line Driver* Data Sheet Description Features These line drivers are similar to the popular 26LS31 device, Supply Voltage Range 4.75 V to 30 V but without the enable function. They provide the addi- Operation to 800 KHz tional supply voltage range necessary for use in many CMOS and TTL Compatible Inputs industrial control applications. AEIC-2631-S16 not only supports RS-422A, but use of supplies up to 30 V. Output Support RS422A voltage swings up to VCC -2 V are typical. The outputs are High Impedance Buff ered Inputs with hysteresis protected against shorts to ground by a two-fold scheme Outputs short circuit protected of current limiting and thermal shutdown. 70 mA peak SINK current Thermal shutdown is accomplished by monitoring Outputs Protected by Thermal Shut-Down junction temperature and comparing this to a band gap reference on chip. Input hysteresis of about 0.5 V provides Pin Assignment good noise margin, even in noisy industrial control envi- ronments. Input to output propagation delays of less than 200 ns are typical for rising and falling edges of the input A 1 16 VCC IN waveform, measured to the zero crossing of the diff eren- tial outputs. A+ 2 15 D IN This part is available in 16L SOIC (Pb-free) package. A- 3 14 D+ Applications NC 4 13 D- Encoders B- 5 12 NC Industrial controls B+ 6 11 C- B 7 10 C+ IN GND 8 C 9 IN * Pin compatible with 26LS31 in applications which do not require an enable function.Table 1. Absolute Maximum Ratings Parameters Symbol Min. Max. Units Ref. Operating Temperature Range T -55 125 C A Supply Voltage Range V 4.75 30 V CCD Table 2. Electrical Characteristics Unless otherwise specifi ed, typical values given at Vcc = 2 V, T = 25 C and EN- < 0.8 V A Parameters Symbol Min. Typ. Max. Units Test Conditions Overtemp Operate Point (junction) T - 155 - C Note 1 JOP Overtemp Release Point (junction) T - 105 - C Note 1 JRP Supply Current I 7.0 11.0 17.0 mA V = 5 V (I ) CC1 CC CC1 I 9.0 13.0 20.0 V = 30 V (I ) CC2 CC CC2 Input Positive-Going Threshold V 1.1 1.5 1.9 V T+ Input Negative-Going Threshold V 0.7 1.0 1.4 V T- Low Level Input Current I -4.0 -0.13 - V = 0 V, V = 30 V A IL IN CC High Level Input Current I - 0 4.0 A V = 30 V, V = 30 V IH IN CC Low Level Output1 V - 375 500 mV I = 20 mA, V = 5 V OL1 OL CC Low Level Output2 V - 375 500 mV I = 20 mA, V = 30 V OL2 OL CC High Level Output1 V 2.5 2.8 - V I = -20 mA, V = 5 V OH1 OH CC High Level Output2 V 27.8 28.0 - V I = -20 mA, V = 30 V OH2 OH CC Notes : 1. This is not a test parameter, but for information only. 2. It may be necessary to clamp the outputs with Schottky diodes when driving extremely long cables with high capacitance between outputs. These diodes should have a forward voltage of less than 0.4 V, and be connected with cathode to the output and anode to ground. Table 3. AC Switching Characteristics Values given at V = 24 V, T = 25 C, C = 100 pF on all outputs. CC A L Parameters Symbol Min. Typ. Max. Units Test Conditions Propagation delay, rising input 50% point T - 150 285 ns See above. PLH to zero crossing of diff erential outputs Propagation delay, falling input 50% point T - 170 310 ns See above. PHL to zero crossing of diff erential outputs Output Rise Time T - 95 310 ns See above. R Output Fall Time T - 40 165 ns See above. F 2