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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Viso Parameter Input clock signal offset voltage Viso variation Min.
Memory Interfaces | Aragio
An example is shown in figure 7. In that case, the designer may decide to eliminate the series resistors entirely. The test circuit is assumed to be similar to the circuit shown in figure 5. With a series resistor of 25? Note however, that all timing specifications are still set relative to the ac input level. Units V mV Notes 1 1 0.
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. While driver characteristics are derived from a 50? By downloading this file the individual agrees not to charge for or resell the resulting material.
Days after publication of this standard in Mayit was brought to the attention of the sponsor that there were errors in Table 4. The second clause defines the minimum dc and ac input parametric requirements and ac test conditions for inputs on compliant devices. This is accomplished precisely because drivers and receivers are specified independently of each other.
In order to meet the mV minimum requirement for VIN, a minimum of 8. 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. F or info rm ationcon tact: An example is shown in figure 8. Making this distinction is important for the design of high gain, differential, receivers that are required.
This can be expressed by equation-1 or equation VTT is specified as being equal to 0. Vx ac indicates the voltage at which differential input signals must be crossing. The standard defines a reference voltage VREF which is used at the receivers as well as a voltage VTT to which termination resistors are connected. However, the drivers are connected directly onto the bus so there are no stubs present. 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.
This is illustrated in figure 2. Busses may be terminated by resistors to an external termination voltage.
EIA JEDEC STANDARD jesdb-sstl_2_百度文库
The relationship of the different levels is shown in figure 1. Clearly it is not the intention to show hesd8 possible variations in this standard. NOTE 2 A 1. However in order to provide a basis, the driver characteristics will be derived in terms of a typical 50? Under these conditions VOH is 1.
Stub Series Terminated Logic
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.
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.
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 jsd8 conditions under which the driver ac specifications can be tested. No claims to be in conformance with this standard may jeesd8 made unless all requirements stated in the standard are met.
Figure 3 shows the nesd8 dc environment that the output buffer is presented with.
However a Class II buffer would dissipate more power due iesd8 its larger current drive and thus might require special cooling. However, in the case of VIH Max.