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 relationship of the different levels is shown in figure 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 use by jesd88 other than JEDEC members, whether the standard is to be used either domestically or internationally.

An example of this is shown in figure jssd8. However, the drivers are connected directly onto the bus so there are no stubs present. Busses may be terminated by resistors to an external termination voltage. NOTE 2 A 1. 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. The Standards, Publications, and Outlines that they generate are accepted throughout the world.

In this example a Class Jeed8 type buffer might be preferred since it comes closer, in conjunction with the series resistor, to match the characteristic impedance of the transmission line. In order to meet the mV minimum requirement for VIN, a minimum of 8. 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. F or info rm ationcon tact: Note however, that all timing specifications are still set relative to the differential ac input level.


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However in order to provide a basis, the driver characteristics will be derived in terms 9n a typical 50? This can be expressed by equation-1 or equation The test circuit is assumed to be similar to the circuit shown in figure 4. An example is shown in figure 8. This is illustrated in figure 2. The jese8 specifications are divided into two classes, Class I and Class II, which are distinguished by drive requirements and application.

Figure 3 shows the typical dc environment that the output buffer is presented with. See also figure 2.

While driver characteristics are derived from a 50? One advantage of this approach is that there is no need for a VTT power supply. AC test conditions may be measured under nominal voltage conditions as long jsed8 the supplier can demonstrate by uesd8, that the device will meet its timing specifications under all supported voltage conditions.

Units V V Notes 2. However a Jewd8 II buffer would dissipate more power due to its larger current drive and thus might require special cooling. The system designer will be able to vary impedance levels, termination resistors and supply voltage and be able to calculate the effect jewd8 system voltage margins.


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. An example of this may be address drivers on a memory board. Under these conditions VOH is 1. Units V mV Notes 1 1 0.

Stub Series Terminated Logic

Viso Parameter Input clock signal offset voltage Viso variation Min. This clause is added to set the conditions under which the driver ac specifications b9 be tested.

Typically the value of VREF is expected to be 0. Jessd8 is specified as being equal to 0. The first clause defines pertinent supply voltage requirements common to all compliant ICs. The standard is particularly intended to improve operation in situations where busses must be isolated from relatively large stubs.

Memory Interfaces | Aragio

An example is shown in figure 7. The tester may therefore supply signals with a 1. Compliant devices must meet the VSwing ac specification under actual use conditions.

The specifications are quite different from traditional ejsd8, where minimum values for VOH and maximum values for VOL are set that apply to the entire supply range. 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.

In this non binding section we will show some derived applications.

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