IDT 89HPES16NT16G2 Datasheet
10 of 33 December 17, 2013
Signal Type Name/Description
REFRES[6:4,1,0] — External Reference Resistor. Reference for the corresponding SerDes
bias currents and PLL calibration circuitry. A 3K Ohm +/- 1% resistor should
be connected from this pin to ground and isolated from any source of noise
injection. Each bit of this signal corresponds to a SerDes quad, e.g.,
REFRES[4] is the reference resistor for SerDes quad 4.
REFRESPLL — PLL External Reference Resistor. Provides a reference for the PLL bias
currents and PLL calibration circuitry. A 3K Ohm +/- 1% resistor should be
connected from this pin to ground and isolated from any source of noise
injection.
V
DD
CORE — Core V
DD.
Power supply for core logic (1.0V).
V
DD
I/O — I/O V
DD.
LVTTL I/O buffer power supply (3.3V).
V
DD
PEA — PCI Express Analog Power. Serdes analog power supply (1.0V).
V
DD
PEHA — PCI Express Analog High Power. Serdes analog power supply (2.5V).
V
DD
PETA — PCI Express Transmitter Analog Voltage. Serdes transmitter analog
power supply (1.0V).
V
SS
— Ground.
Table 9 Power, Ground, and SerDes Resistor Pins
