What is the rise and fall time requirement for the JTAG data (TDO) going to the USB Blaster? - What is the rise and fall time requirement for the JTAG data (TDO) going to the USB Blaster? Description The rise and fall times for the input of the 74LVC244APW driver that is used in the USB Blaster™ are min 0 ns/V to a max of 10 ns/V with a voltage range of 2.7V to 3.6V on the VCC pin. If you are using lower voltage on the VCC pin in the range of 1.2V to 2.7V then the spec will be a min of 0 ns/V to a max of 20 ns/V. For more information please refer to the Philips buffer/driver (74LVC244APW) devices datasheet. Related Articles Does Altera provide rise and fall time specifications for the JTAG input signals TCK, TMS, and TDI? Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['novalue'] novalue novalue ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']