Datasheet, Volume 1 89
Electrical Specifications
Notes:
1. Unless otherwise noted, all specifications in this table apply to all processor frequencies.
2. The VCCIO referred to in these specifications refers to instantaneous VCCIO.
3. For VIN between “0” V and VCCIO. Measured when the driver is tri-stated .
4. VIH and VOH may experience excursions above VCCIO. However, input signal drivers must comply with the
signal quality specifications.
Notes:
1. Refer to the PCI Express Base Specification for more details.
2. Low impedance defined duri ng signaling. Parameter is captured for 5.0 GHz by RLTX-DIFF.
3. DC impedance limits are needed to ensure Receiver detect.
4. The Rx DC Common Mode Impedance mus t be present when the Receiver terminations are first enabled to
ensure that the Receiver Detect occurs properly. Compensation of this impedance can start immediately
and the 15 Rx Common Mode Impedance (constrained by RLRX-CM to 50 ±20%) must be within the
specified range by the time Detect is entered.
5. COMP resistance must be provided on the system board with 1% resistors.
6. PEG_ICOMPO, PEG_ICOMPI, PEG_RCOMPO are the same resistor. Intel allows using 24.9 1% resistors.
Table 7-8. Control Sideband and TAP Signal Group DC Specifications
Symbol Parameter Min Max Units Notes1
VIL Input Low Voltage VCCIO * 0.3 V 2
VIH Input High Voltage VCCIO * 0.7 V 2, 4
VOL Output Low Voltage VCCIO * 0.1 V 2
VOH Output High Voltage VCCIO * 0.9 V 2, 4
RON Buffer on Resistance 23 73
ILI Input Leakage Current ±200 A3
Table 7-9. PCI Express* DC Specifications
Symbol Parameter Min Typ Max Units Notes1
ZTX-DIFF-DC DC Differential Tx Impedance (Gen 1
Only) 80 — 120 2
ZTX-DIFF-DC DC Differential Tx Impedance (Gen 2
and Gen 3) — 120 2
ZRX-DC DC Common Mode Rx Impedance 40 60 3, 4
ZRX-DIFF-DC DC Differential Rx Impedance (Gen 1
Only) 80 — 120
PEG_ICOMPO Comp Resistance 24.75 25 25.25 5, 6
PEG_ICOMPI Comp Resistance 24.75 25 25.25 5, 6
PEG_RCOMPO Comp Resistance 24.75 25 25.25 5, 6