JEDEC JESD67 ERTA-1999 I O Drivers and Receivers with Configurable Communication Voltage Impedance and Receiver Threshold.pdf

1、Electronic Industries AllianceJune 10, 1999ERRATA SHEETTOJEDEC Standard No. 67, “I/O Drivers and Receivers with Configurable CommunicationVoltage, Impedance, and Receiver Threshold“ was published February 1999 and containedreversed inequalities in subclauses 1.2 and 2.2.This errata contains the corr

2、ection for JESD67, subclause 1.2 and 2.2 on pages 2 and 4. At thebottom of each page the inequality (:S) signs are backwards, it should be()sign. Please makethe correction to read: VODVDDQ0.6 x VOD in both locations in place ofVOD:S VDDQ:S 0.6 x VOD.Attached are the corrected pages. Our apologies fo

3、r any inconvenience this may have caused.Sincerely,JlA.LLe c,lIlyLsoV Julie CarlsonJEDEC Publications2500 Wilson Boulevard Arlington, Virginia 22201-3834 (703) 907-7500. FAX (703) 907-7501JEDEC Standard No. 67Page 21.1 Nominal supply voltages and I/O parametrics (contd)Table 1-2 - Nominal Interface

4、ParametricsClass A (High Performance) Class B (Wide Margin)Vih(DCLmin = Vref + 0.07*VDD Vih(DCLmin=Vref+0.14 * VDDVih(DCLmax = VDDQ + 0.10*VDD Vih(DCLmax=VDDQ-+010*VDDVil(DCLmax = Vref- 0.07 *VDD Vil(DCLmax=Vref - 0.14*VDDVil(DCLmin=VSS Vil(DCLmin=VSSVih(ACLmin = Vref + 0.14 * VDD Vih(ACLmin=Vref+ 0

5、.25 *VDDVih(ACLmax = VDDQ + 0.15 * VDOVih(ACLmax=VDDQ+ 0.15 * VDDVil(ACLmax = Vref - 0.14 * VDO Vil(ACLmax=Vref- 0.25 * VDDVil(ACLmin = VSS - 0.15 *VDO Vil(ACLmin = VSS - 0.15 * VDDAlthough it is commonplace to standardize Output driver current and output driver voltages(yoh, Vol), this standard wil

6、l refer to output driver impedances. Through reference to driverimpedance the driver characteristics will become easier to defme and the resultant driverbehavior under various loading conditions will be easier to predict. For the expected values fordriver impedance and the parametrics associated wit

7、h the drivers (see section 4).1.2 InteroperabilityIt is expected that a group of devices of different supply voltages VDD will communicate with acommon communication voltage VDDQ which is equal to or less than VDD_low the lowestsupply voltage of the group. Although it is desirable that chips of supp

8、ly voltage VDD operateover the largest possible range of VDDQ, to meet this standard it is sufficient that chips of VDOspecified in table 1-3 support communication at the associated values of VDDQ, with the Vil,Vih specifications oftable 1-2.Table 1-3 - Relationship between VDD, VDDQ, and VrefVDD VD

9、DQ Vref3.3 V 3.3 V, 2.5 V 1.5 V, 1.25 V2.5 V 2.5 V, 1.8 V 1.25 V, 0.9 V1.8 V 1.8 V, 1.5 V, 1.2 V 0.9 V, 0.75 V, 0.6 VThe relationship is roughly VOOvnoQ0.6 x VOOJEDEC Standard No. 67Page 42.1 Nominal supply voltages and 110 parametrics (contd)Table 2-2 - Nominal Interface ParametricsClass A (High Pe

10、rformance) Class B (Wide Margin)Vih(DCLmin = Vref + 0.07 * VDD Vih(DCLmin=Vref+0.14 *VDDVih(DCLmax=VDDQ + 0.10 * VDO Vih(DCLmax=VDDQ+O.IO*VDDVil(DCLmax=Vref-0.07 * VDD Vil(DCLmax=Vref - 0.14*VDDVil(DCLmin=VSS Vil(OCLmin=VSSVih(ACLmin=Vref + 0.14 * VDD Vih(ACLmin=Vref+0.25 *VDDVih(ACLmax=VODQ + 0.15

11、* VDD Vih(ACLmax=VDDQ+0.15 * VDDVil(ACLmax = Vref - 0.14 * VDD Vil(ACLmax = Vref - 0.25 * VDDVi1(ACLmin = VSS - 0.15 *VDD Vil(ACLmin = VSS - 0.15 * VDDAlthough it is commonplace to standardize output driver currents and output driver voltages(Voh, Vol), this standard will refer to output driver impe

12、dances. Through reference to driverimpedance the driver characteristics will become easier to define and the resultant driverbehavior under various loading conditions will be easier to predict. For the expected values fordriver impedance and the parametrics associated with the drivers (see section 4

13、).2.2 InteroperabilityIt is expected that a group of devices of different supply voltages VDD will communicate with acommon communication voltage VDDQ which is equal to or less than VDD_low, the lowestsupply voltage of the group. Although it is desirable that chips of supply voltage von operateover

14、the largest possible range of VDDQ, to meet this standard it is sufficient that chips of VDDspecified in table 2-3 support communication at the associated values of VDDQ, with the Vil,Vih specifications oftable 2-2.Table 2-3 - Relationship between VDD, VDDQ, and VrefVDD VDDQ Vref1.5V1.2 V1.0 V1.5 V, 1.2 V, 1.0 V1.2 V, 1.0 V, 0.8 V1.0 V, 0.8 V0.75 V, 0.6 V, 0.5 V0.6 V, 0.5 V, 0.4 V0.5 V, 0.4 VThe relationship is rougWy VDDVDDQ0.6 x von