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.
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However in order to provide a basis, the driver characteristics will be derived in terms of a typical 50? Vx ac indicates the voltage at which differential input signals must be crossing. Viso Parameter Input clock signal offset voltage Viso variation Min. An example is shown in figure 8. An example of jeed8 is shown in figure 6. Note however, that all timing specifications are still set relative to the ac input level.
With a series resistor of 25? 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.
Typically the value of VREF is expected to be 0.
Stub Series Terminated Logic
The dc values are chosen such that the final logic state is unambiguously defined, that is once the receiver input has crossed this value, the receiver will change to and maintain the new logic state.
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.
The standard jesdd8 particularly intended to improve operation in situations where busses must be isolated from relatively large stubs. However, the drivers are connected directly onto the bus so there are no stubs present. By downloading this file the individual agrees not to charge for or resell the resulting material. VTT is specified as being equal nesd8 0.
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. Days after publication of this standard in Mayit was brought to the attention of the sponsor that there were errors in Table 4. NOTE 4 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.
Jesx8, in the case of VIH Max. The test circuit is assumed to be similar to the circuit shown in figure 4. The third clause specifies the minimum required output characteristics of, and ac test conditions for, compliant outputs targeted for various application environments.
This clause is added to set the conditions under which the driver ac specifications can be tested. The first clause defines pertinent supply voltage requirements common to all compliant ICs.
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. This can be expressed by equation-1 or equation One advantage of this approach is that there is no need for a VTT power supply. Clearly it is not the intention to show all possible variations in this standard. The system 9 will be able to vary impedance levels, termination resistors and supply voltage and be able to calculate the effect on system voltage b9.
JEDEC standards and publications are adopted without regard to whether or not their adoption may involve patents or articles, materials, or processes. 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.
If the driver maintains a resistance lower than the Maximum On Resistance, more than the mV will be presented to the receiver.
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. Under these conditions VOH is 1. The second clause defines the minimum dc and ac input parametric requirements and ac test conditions for inputs on compliant devices. Compliant devices must meet the VSwing ac specification under actual use conditions. An example of ringing is illustrated in the dotted wave-form.
EIA JEDEC STANDARD jesdb-sstl_2_百度文库
Units V mV Notes 1 1 0. In order to meet the mV minimum requirement for VIN, a minimum of 8. The relationship of the different levels is shown in figure 1.
This is accomplished precisely because drivers and receivers are specified independently of each other. NOTE 2 A 1. JEDEC standards and publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for 9 by those other than JEDEC members, whether the standard is to be used either domestically or internationally.