Appendix A: Layout Technology Files

Usage	*Technology files (.TCH)**	Design complexity level/class	Units	Trace width	Route spacing	System settings Grid settings (mills)	Default via size	Layers provided	Default board outline
Place	Routing	Via	Route	Plane	Drill	Route	Plane
Typical	_default	A	Mils	12	12	100	25	25	50	75	28	12	2	None
default	A	Mils	12	12	100	25	25	50	75	28	12	2	None
1bet_any	A	Mils	12	12	100	25	25	50	75	28	12	2	None
2bet_smt	B	Mils	8	8	100	8 1/3	8 1/3	40	70	20	12	2	None
2bet_thr	B	Mils	10	8	100	20	20	40	70	20	12	2	None
3bet_any	C	Mils	6	6	100	12 1/2	12 1/2	36	70	20	12	2	None
metric	B	Metric	0.254	0.254	1.27	0.254	0.254	0.762	1.524	0.381	12	2	None
Chip package	ceramic	B	Metric	0.25/0.28	0.254	1.27