Rise and fall times for various logic families
| Logic family | Transition time (ns) | Rank (fastest) | ||
|---|---|---|---|---|
| RT | FT | |||
| 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 | |
Source: Partial data from IPC-2251, Design Guide for the Packaging of High Speed Electronic Circuit (2003. www.ipc.org) and Coombs (2001, Coombs’ printed circuits handbook (5th ed.). New York: McGraw-Hill).
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