Datasheet

Driver Cards
7–336
2.11.2 Edge-Rate Control
The device used as the backplane driver, SN74GTLPH1655, has a feature by
which the backplane slew rate is adjustable via an external edge-rate-control
(ERC) pin held at 3.3 V (slow) or GND (fast). The ERC is set by the JB3 jumper
located below the bit-selection jumper and has two positions: not connected
is slow, and shorted is fast (see Figure 2–20). The following ERC options are
available:
- JB3 open Slow edge rate
- JB3 shorted Fast edge rate
Figure 2–20. ERC Bit-Selection Jumper Set for Slow (Left) or Fast (Right) Rate
JB3 Jumper