ATX Version 3.0 Multi Rail Desktop Platform Power Supply

Design Guide

ID 336521
Date 01/02/2022
Public

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Sideband Signals DC Specifications (Required)

The four sideband signals defined for the 12VHPWR connector DC Specifications are shown in Table 3-7. This is the requirement defined by the PCIe* CEM 5.0 Specification for the Add-in Cards.

Table 3-7: PCI Express* 12VHPWR Connector – Sideband Signal DC Specifications

Symbol

Parameter

Conditions

Min

Max

VHMAX

Max High Voltage any Pin

3.3 V +0.5 V

VIL

Input Low Voltage

-0.2 V

+0.8 V

VIH

Input High Voltage

+2.0 V

3.3 V +0.2 V

VOL

Output Low Voltage

7.0 mA

-0.2 V

+0.5 V

VOH

Output High Voltage (refer note)

4.0 mA

+2.4 V

3.3 V + 0.2 V

RPULL-UP

Pull-up / Pull-down Resistance tolerance

-10%

+10%

Note:For Open-Collector/Open Drain Signal CARD_​PWR_​STABLE output a pull-up is required. There is no VOH specification for this signal.