11 of 30 June 12, 2014
IDT 89HPES4T4 Data Sheet
Recommended Operating Supply Voltages
Power-Up/Power-Down Sequence
This section describes the sequence in which various voltages must be applied to the part during power-up to ensure proper functionality. For the
PES4T4, the power-up sequence must be as follows:
1. V
DD
I/O — 3.3V
2. V
DD
Core, V
DD
PE, V
DD
APE — 1.0V
3. V
TT
PE — 1.5V
When powering up, each voltage level must ramp and stabilize prior to applying the next voltage in the sequence to ensure internal latch-up issues
are avoided. There are no maximum time limitations in ramping to valid power levels.
The power-down sequence must be in the reverse order of the power-up sequence.
Recommended Operating Temperature
Power Consumption
Typical power is measured under the following conditions: 25°C Ambient, 35% total link usage on all ports, typical voltages defined in Table 12.
Maximum power is measured under the following conditions: 70°C Ambient, 85% total link usage on all ports, maximum voltages defined in
Table 12.
All power measurements assume that the part is mounted on a 10 layer printed circuit board with 0 LFM airflow.
Symbol Parameter Minimum Typical Maximum Unit
V
DD
CORE Internal logic supply 0.9 1.0 1.1 V
V
DD
I/O I/O supply except for SerDes LVPECL/CML 3.135 3.3 3.465 V
V
DD
PE PCI Express Digital Power 0.9 1.0 1.1 V
V
DD
APE PCI Express Analog Power 0.9 1.0 1.1 V
V
TT
PE PCI Express Serial Data Transmit
Termination Voltage
1.425 1.5 1.575 V
V
SS
Common ground 0 0 0 V
Table 12 PES4T4 Operating Voltages
Grade Temperature
Commercial 0
C to +70C Ambient
Industrial -40C to +85C Ambient
Table 13 PES4T4 Operating Temperatures
Number of
Connected
Lanes
Core Supply
PCIe Digital
Supply
PCIe Analog
Supply
PCIe Termin-
ation Supply
I/O Supply Total
Typ
1.0V
Max
1.1V
Typ
1.0V
Max
1.1V
Typ
1.0V
Max
1.1V
Typ
1.5V
Max
1.575V
Typ
3.3V
Max
3.465V
Typ
Power
Max
Power
1/1/1/1 mA 270 363 218 279 110 130 101 125 3 3.3
Watts 0.27 0.40 0.22 0.31 0.11 0.14 0.15 0.20 0.01 0.01 0.76 1.06
Table 14 PES4T4 Power Consumption