Other Parts Discussed in Thread: SN74LVC4245A, TXB0108, SN74CB3T3245, SN74LVC16T245, SN74LV4T125
Hello,
I have to level shift a local bus from a legacy PLX technologies (Broadcom) to an Altera FPGA, and am looking for the best TI Family of level shifters.
I'm considering the SN74CB3T3245 (Fet bus switch) , SN74LVC4245A, SN74LVC8T245 (has been recommended on this forum for similar applications) or possibly the TXB0108.
Auto-sense vs, direction controlled is a secondary consideration, so long as there are no problems otherwise.
33MHz bidirectional, 32 bit address and data lines, and 8 bits of Byte enables / parity.
on the one side is a Broadcom PCI9080, 5V TTL only, standard 5VTTl voltage thresholds for Vout and Vin. capacitance 10pF, but the PCI9080 datasheet requires 3k-10k Ohm pullups on all of these local bus lines(address and data lines). 8mA current output
On the other side is an Alter FPGA, which is 3.3V TTL (3.3V CMOS also available among others) with a maximum Vio of 3.6v. Capacitance is 8pF. 4mA current output at 3.3VTTL.
Thanks for your help,
Dan