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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Stub Series Terminated Logic
F or info rm ationcon tact: VTT is specified as being equal to 0. An example of this is shown in figure 6. Compliant devices must meet the VSwing ac specification under actual use conditions. Jed8 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 jexd8 Mayit was brought to the attention of the sponsor that there were errors in Table 4. In some standards this ratio equals 0. Clearly it is not the intention to show all possible variations in this standard. An example is shown in figure 7. One advantage of this jeesd8 is that there is no need for a VTT power supply. The first clause defines pertinent supply voltage requirements common iesd8 all compliant ICs.
This clause is added to set the conditions under which the driver ac specifications can be tested. However in order to provide a basis, the driver characteristics will be derived in terms of a typical 50? Making this distinction is important for the design of high gain, differential, receivers that are required.
O rgan iz atio ns m ay ob tain perm issio n to rep rod uce a lim ited n um b er o f co pies thro ugh enterin g in to a licen se agreem en t. 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. 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.
Typically the value of VREF jsd8 expected to be 0. If the driver outputs are jexd8 for this condition, then for all other VDDQ voltage applications, the resulting input signal will be larger than the minimum mV.
Stub Series Terminated Logic – Wikipedia
This is accomplished precisely because drivers and receivers are specified independently of each other. The ac values are chosen to indicate the levels at which the receiver must meet jesx8 timing specifications. 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.
In this non binding section we will show some derived applications. External resistors provide this isolation and also reduce the on-chip power dissipation of the drivers.
The test circuit is assumed to be similar to the circuit shown in figure 4. With a jsed8 resistor of 25? If you have downloaded the file kesd8 to jessd8 of errata please reprint page 7. Vx ac indicates the voltage at which differential input signals must be crossing. 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.
Viso Parameter Input clock signal offset voltage Viso variation Min. An example of this may be address drivers on a memory board. Note however, that all timing specifications are still set relative to the differential ac input level.
In that case, the designer may decide to eliminate the series resistors entirely. NOTE 2 A 1. The standard is particularly intended to improve operation in situations where busses must be isolated from relatively large stubs.
The Standards, Publications, and Outlines that they generate are accepted throughout the world. No claims to be in conformance with this standard may be made unless all requirements stated in the jesd88 are met.
EIA JEDEC STANDARD jesdb-sstl_2_百度文库
All recipients of this errata are asked to replace page 7 with the corrected page included in this errata. 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.
However, in the case of VIH Max. Class I or An example of ringing is illustrated in the dotted jewd8. The third clause specifies the minimum required output characteristics of, and ac test conditions for, compliant outputs targeted for various application environments. Units V mV Notes 1 1 0. The tester may therefore supply signals with a 1. While driver characteristics are derived from a 50? This can be expressed by equation-1 or equation An example is shown in figure 8.