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.
|Published (Last):||19 February 2007|
|PDF File Size:||18.35 Mb|
|ePub File Size:||3.21 Mb|
|Price:||Free* [*Free Regsitration Required]|
With a series resistor of 25? Making this distinction is important for the jeds8 of high gain, differential, receivers that are required. The tester may therefore supply signals with a 1.
Memory Interfaces | Aragio
This clause is added to set the conditions under which the driver ac specifications can be tested. If the driver maintains a resistance lower than the Maximum On Resistance, more than the mV will be presented to the receiver. 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.
Note however, that all timing specifications are still set relative to the ac input level. In this non binding section we will show some derived applications.
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 jssd8 pies thro ugh enterin g in to hesd8 licen se agreem en t. The Standards, Publications, and Outlines that they generate are accepted throughout the world.
An example of this may be address drivers on a memory board. Units V mV Notes 1 1 0. Units V V Notes 2. However, the drivers are connected directly onto the bus so there are no stubs jsd8. In this example a Class II type buffer might be preferred since it comes closer, in conjunction with the series resistor, to match the characteristic impedance of the transmission line.
JEDEC is the leading 99b of standards for the solid-state industry, they have published over documents to date. The test circuit is assumed to be similar to the circuit shown in figure 4.
JEDEC standards and publications are designed to serve the public 9v 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 those other than JEDEC members, whether the standard is to be used either domestically or internationally.
JEDEC standards and publications are adopted without regard to whether or not their adoption may involve patents or articles, materials, or processes. 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 can be expressed by equation-1 or equation An example is shown in figure 8.
However in order to provide a basis, the driver characteristics will be derived in terms of a typical 50? In some standards this ratio equals 0. In that case, the designer may decide to eliminate the series resistors entirely. jesd
Stub Series Terminated Logic
Viso Parameter Input clock signal offset voltage Viso variation Min. The test circuit is assumed to be similar to the circuit shown in figure 5. The standard is particularly intended to improve operation in situations where busses must be isolated from relatively large stubs.
No claims to be in conformance with this standard may be made unless all requirements stated in the standard are met. 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.
External resistors provide jwsd8 isolation and also reduce the on-chip power dissipation of the drivers. Busses may be terminated by resistors to an external termination voltage. Clearly it is not the intention to show all possible variations in this standard. The second 99b defines the minimum dc and ac input parametric requirements and ac test conditions for inputs on compliant devices.
Under these conditions VOH is 1. Days after publication of this standard in Mayit was brought to the attention of the sponsor that there were errors in Table 4. 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. Typically the value of VREF is expected to be 0.
VTT is specified as being equal to 0. One advantage of this approach is that there is no need for a VTT power supply. The first clause defines pertinent supply voltage requirements common to all compliant ICs.
The third clause specifies the minimum required output characteristics of, and ac test conditions for, compliant outputs targeted for various application environments. Compliant devices must meet the VSwing ac specification under actual use conditions.
However, in the case of VIH Max. While driver characteristics are derived jexd8 a 50?
NOTE 2 A 1. However a Class II buffer would dissipate more power due to its larger current drive and thus might require special cooling. The relationship of the different levels is shown in figure 1.