Hi,

We are using SN74LVC244A in our design as a 1.8V buffer for JTAG interface to an Altera FPGA (Arria 10 series) as JTAG Emulator - Buffer - FPGA

Through JTAG interface we are not able to detect the FPGA. Later we observed in the datasheet of buffer that the IOH level for 1.8V buffer will be nearly 4mA which is very less.

So suspecting the insufficient current for FPGA to sense the JTAG signal, we removed buffer and directly shorted the Buffer input and output pads (means isolated the buffer and bypassed the signals directly to FPGA) as JTAG Emulator -FPGA. In that case we are able to detect FPGA through JTAG.

So we are looking for a buffer of same pin outs and foot print as that of SN74LVC244A with higher drive current (IOH more than 4mA @ VCC=1.8V). Please suggest suitable part.

Regards,

Vijetha