SSTL_3, V, defined in EIA/JESD ; SSTL_2, V, defined in EIA/ JESDB used in DDR among other things. SSTL_18, V, defined in. STUB SERIES TERMINATED. LOGIC FOR VOLTS (SSTL_2). EIA/JESD SEPTEMBER ELECTRONIC INDUSTRIES ALLIANCE. JEDEC Solid State . SSTL (JESD, JESDB, JESD). • HSTL (JESD). LVTTL and LVCMOS were developed as a direct result of technology scaling. With each reduction in.
|Published (Last):||13 October 2016|
|PDF File Size:||19.87 Mb|
|ePub File Size:||6.96 Mb|
|Price:||Free* [*Free Regsitration Required]|
The information included in JEDEC standards and publications represents a sound approach to product specification and application, principally from the solid state device manufacturer viewpoint. An example is shown in figure 8. This can be expressed by equation-1 or equation Typically the value of VREF is expected to be 0. External resistors provide this isolation and also reduce the on-chip jedd8 dissipation of the drivers.
The second clause defines the minimum dc and ac input mesd8 requirements and ac test conditions for inputs on compliant devices. The system designer can be sure that the device will switch state a certain amount of time after the input has crossed ac threshold and not switch back as long as the input stays beyond the dc threshold.
This is accomplished precisely because drivers and receivers are specified independently of each other. If you have downloaded the file prior to date of errata please reprint page 7. Clearly it is not the intention to show all possible variations in this standard. AC test conditions may be measured under nominal voltage conditions as long as the supplier can demonstrate by analysis, that the device will meet its timing specifications under all supported voltage conditions.
Note however, that all timing specifications are still set relative to the differential ac input level.
EIA JEDEC STANDARD jesdb-sstl_2_百度文库
If the driver maintains a resistance lower than the Maximum On Resistance, more than the mV will be presented to the receiver. NOTE 2 A 1. Figure 3 shows the typical dc environment that the output buffer is presented with. In order to meet the mV minimum requirement for VIN, a minimum of 8. One advantage of this approach is that there is no need for a VTT power supply. This clause is added to set the conditions under which the driver ac specifications can be tested.
The specifications are quite different from traditional specifications, where minimum values for VOH and maximum values for VOL are set that apply to the entire supply range. The first clause defines pertinent supply voltage requirements common to all compliant ICs.
An example of this may be address drivers on a memory board. By downloading this file the individual agrees not to charge for or resell the resulting material. The standard is particularly intended to improve operation in situations where busses must be isolated from relatively large stubs. The test circuit is assumed to be similar to the circuit shown in figure 4.
Almost representatives, appointed by some JEDEC member companies work together in 50 JEDEC committees to meet the needs of every segment of the industry, manufacturers and consumers alike. All recipients of this errata are asked to replace page 7 with the corrected page included in this errata.
Stub Series Terminated Logic
No claims to be in conformance with this standard may be made unless all requirements stated in the standard are met. The relationship of the different levels is shown in figure 1.
Days after publication of this standard in Jedd8it was brought to the attention of the sponsor that there were errors in Table 4.
With a series resistor of 25?
An example of this is shown in jed8 6. While driver characteristics are derived from a 50? If the driver outputs are sized for this condition, then for all other VDDQ voltage applications, the resulting input signal will be larger than the minimum mV.
JEDEC standards and publications are adopted without regard to whether or not their adoption may involve patents or articles, materials, or processes. Viso Parameter Input clock signal offset voltage Viso variation Min. In that case, the designer may decide to eliminate the series resistors entirely.