Complete PCB Design Using OrCAD Capture and PCB Editor

Appendix C. Rise and Fall Times for Various Logic Families

Transition time (ns)
Logic family	RT	FT	Rank (fastest)
BiCMOS	ABT	1.6	1.4	14
	BCT	0.7	0.7	12
	LVT	2.7	2.8	29
CMOS	AC	1.7	1.5	15
	ACT	1.7	1.5	25
	ACQ	2.4	2.4	16
	ACTQ	2.5	2.4	27
	AHCT	2.4	2.4	26
	C	35	25	39
	FCT	1.5	1.2	13
	HC	3.6	4.1	33
	HCT	4.6	3.9	34
	LCX	2.9	2.4	28
	LV	3.0	3.0	30
	LVQ	3.5	3.2	31
	LVX	4.8	3.7	35
	VCX	2.0	2.0	20
	VHC	4.1	3.2	32
ECL	10K	2.2	2.2	22
	10KH	1.7	1.7	17
	100K	0.6	0.6	11
	300K	0.5	0.5	10
	E	0.38	0.38	8
	EP	0.11	0.11	6
	LVEL	0.22	0.22	3
	EL	0.23	0.23	5
	SiGe-2.5V	0.02	0.02	1
	SiGe-3.3V	0.3	0.03	2
GaAs	0.3	0.1	4
LVDS	0.3	0.3	7
SSTL	0.3	0.5	9
TTL	74nn	8.0	5.0	36
	ALS	2.3	2.3	24
	AS	2.1	1.5	18
	F	2.3	1.7	21
	FR	2.1	1.5	19
	H	7.0	7.0	37
	L	35	30	40
	LS	15	10	38
	S	2.5	2.0	23
Partial data from IPC-2251 and Coombs 2001.