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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The driver specification now must guarantee that these values of VIN are obtained in the worst case conditions specified by this standard. The relationship of the different levels is shown in figure 1.
Clearly it is not the intention to show all possible variations in this standard. However a Class II buffer would dissipate more power due to its larger current drive and thus might require special cooling.
Viso Parameter Input clock signal offset voltage Viso variation Min. In some standards this ratio equals 0. This clause is added to set the conditions under which the driver ac specifications can be tested.
The standard is particularly intended to improve operation in situations where busses must be isolated from relatively large stubs. Figure 3 shows the typical dc environment that the output buffer is presented with.
Stub Series Terminated Logic
Class I or An example of ringing is illustrated in the dotted wave-form. Uesd8 however, that all timing specifications are still set relative to the differential ac input level. Units V V Notes 2.
Typically the value of VREF is expected to be 0.
99b Note however, that all timing specifications are still set relative to the ac input level. In order to meet the mV minimum requirement for VIN, a minimum of 8. An example is shown in figure 8.
The tester may therefore supply signals with a 1. Units V mV Notes 1 1 0. While driver characteristics are derived from a 50?
The third clause specifies the minimum required output characteristics of, and ac test conditions for, compliant outputs targeted for various application environments.
Stub Series Terminated Logic – Wikipedia
The system designer will be able to vary impedance levels, termination resistors and supply voltage and be able to calculate the effect on system voltage margins.
Vx ac indicates the voltage at which differential input signals must be crossing. 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.
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.
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. JEDEC standards and publications are adopted without regard to whether or not their adoption may involve patents or articles, materials, or processes.
The Standards, Publications, and Outlines that they generate are accepted throughout the world. The test circuit is assumed to be similar to the circuit shown in figure 5.
This can be expressed by equation-1 or equation The first clause defines pertinent supply voltage requirements common to jsd8 compliant ICs. Compliant devices must meet the VSwing ac specification under actual use conditions. 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.
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 jes8d the input stays beyond the dc threshold. Busses may be terminated by resistors to an external termination voltage.
An example of this may be address drivers on a memory board.