Datasheet

SCBA015A
7–50
Fast GTLP Backplanes With the GTLPH1655
Summary
The SN74GTLPH1655 from TI provides engineers who develop fast and complex bus systems
with a high-performance bus driver that is particularly suitable for the design of modern
low-voltage systems.
Very high signal-propagation speeds are possible, as a result of the increased drive capability of
100 mA, compared with standard GTL circuits (40 mA), and the selectable edge rate. Bus lines
with low line impedances of about 22 Ω can be used with the SN74GTLPH1655.
Bus lines with low line impedances of about 22 Ω can be matched using GTLP drivers that have
a four-digit identifier, such as the SN74GTLPH1655. The four digits indicate the high drive
capability of I
OL
= 100 mA, while all other GTLP devices have a drive capability of 50 mA.
The four-digit GTLP devices allow optimum termination of low-impedance bus lines, thereby
preventing interference and signal distortion that may otherwise occur as a result of line
reflections. Reduced signal-voltage amplitude improves signal integrity.
The power-up 3-state and precharge functions provided by the SN74GTLPH1655 and, also, the
bus-hold cells at the input of the LVTTL side, allow the design of modern high-speed systems
requiring minimum development effort.