Rainbow Electronics ATF1504ASL - Manual (Page 18)

18
ATF1504AS(L)
0950N–PLD–07/02
PCI Compliance
The ATF1504AS also supports the growing need in the industry to support the new
Peripheral Component Interconnect (PCI) interface standard in PCI-based designs and
specifications. The PCI interface calls for high current drivers, which are much larger
than the traditional TTL drivers. In general, PLDs and FPGAs parallel outputs to support
the high current load required by the PCI interface. The ATF1504AS allows this without
contributing to system noise while delivering low output-to-output skew. Having a pro-
grammable high drive option is also possible without increasing output delay or pin
capacitance. The PCI electrical characteristics appear on the next page.
PCI Voltage-to-current Curves for +5V Signaling in Pull-up Mode
PCI Voltage-to-current Curves for +5V Signaling in Pull-down Mode
2.4
VCC
1.4
-2 -44 -178
Current (mA)
AC drive
point
DC
drive point
Voltage
Pull Up
Test Point
2.2
VCC
0.55
3,6 95 380
Current (mA)
AC drive
point
DC
drive point
Voltage
Pull Down
Test Point