1. Validation of EIAJ IMIC Models Raj Raghuram Applied Simulation Technology IBIS Summit Dec. 7, 1998

2. Summary What is IMIC and Introduction Advantages of IMIC Validation Procedure Validation for MC74LCX245 Validation for TI 16233.cbt Conclusions

3. Validation Procedure Find driver with SPICE model Convert the.model statement to and equivalent Table.model statement Run the circuit with original model for different loads Run the circuit with Table.model for different loads and compare with above

4. Example 1: Motorola 74LCX245 Low Voltage CMOS Octal Transceiver 3 V supply used Tristate non-inverting output Pins are Oebar, T/R, A0-A7, and B0-B7 Package model is just an inductance 24 mA driving capability Pulse with 1ns tr, 1ns delay, and 9ns width

5. MC74LCX245 with 500  pF load to ground Volts ns out V(590)

6. MC74LCX245 with 50  load to ground Volts ns out V(590)

7. MC74LCX245 with 50  load to VCC Volts ns out V(590)

8. MC74LCX245 with 500  load at the end of a 50  ns Tline Volts ns out V(590)

9. 16233.cbt with a 5 pf- 1 k  load at the end of 65  ns Tline IMIC model from ASPICE IMIC model from HSPICE Original BSIM1 model Volts ns

10. How is the IMIC model made? We use SPICE to do it. 3D DC sweep printing capacitors and I at each step. Ensure RD,RS, RSH =0 in doing the run For Generic SPICE have to do a number of runs - a AC analysis at each step or operating point to get capacitances

11. Conclusions IMIC model viable SPICE-like alternative with proprietary information protection Validation has been done for different loads with two different devices. Waveforms from the IMIC model and original SPICE model overlay quite well.