Temperature-Compensated Off-Chip Driver
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-29
In all FET chip designs, the off-chip driver (OCD) performance is limited by the package inductance. Thus, OCD switching speed must be controlled at the fastest design point (-55oC) in order to prevent V=Ldi/dt noise sufficient to cause logic errors. Unfortunately, the slowest design point occurs at 125oC. To prevent logic errors at -55oC, the total number of OCDs allowed to switch at one time is limited by the high di/dt. A design which reduces di/dt will normally also increase the propagation delay.