Electronic Components Datasheet Search |
|
79R3041-25J Datasheet(PDF) 8 Page - Integrated Device Technology |
|
79R3041-25J Datasheet(HTML) 8 Page - Integrated Device Technology |
8 / 34 page 8 IDT79R3041 INTEGRATED RISController FOR LOW COST SYSTEMS COMMERCIAL TEMPERATURE RANGE • Programmable memory Port Widths: The R3041 allows the kernel to partition the physical memory space into various sub-regions, and to individually indicate the port width of these sub-regions. Thus, the bus interface unit can perform data packing and unpacking when communicating with narrow memory sub-regions. For example, these fea- tures, can be used to allow the R3041 to interface with narrow 8-bit boot PROMs, or to implement 16-bit only memory systems. THERMAL CONSIDERATIONS The RISController family utilizes special packaging tech- niques to improve the thermal properties of high-speed pro- cessors. Thus, all versions of the RISController family are packaged in cavity down packaging. The lowest cost members of the family use a standard cavity down, injection molded PLCC package (the “J” pack- age). This package is used for all speeds of the R3041 family. Higher speed and higher performance members of the RISController family utilize more advanced packaging tech- niques to dissipate power while remaining both low-cost and pin- and socket- compatible with the PLCC package. Thus, these members of the RISController family are available in the MQUAD package (the “MJ” package), which is an all alumi- num package with the die attached to a normal copper lead- frame mounted to the aluminum casing. The MQUAD pack- age is pin and form compatible with the PLCC package. Thus, designers can choose to utilize this package without changing their PCB. The members of the RISController family are guaranteed in a case temperature range of 0 °C to +85°C. The type of package, speed (power) of the device, and airflow conditions, affect the equivalent ambient conditions which meet this specification. The equivalent allowable ambient temperature, TA, can be calculated using the thermal resistance from case to ambient (ØCA) of the given package. The following equation relates ambient and case temperature: TA = TC - P * ØCA where P is the maximum power consumption at hot tempera- ture, calculated by using the maximum Icc specification for the device. Typical values for ØCA at various airflows are shown in Table 2 for the PLCC package. NOTES ON SYSTEM DESIGN The R3041 has been designed to simplify the task of high- speed system design. Thus, set-up and hold-time require- ments have been kept to a minimum, allowing a wide variety of system interface strategies. To minimize these AC parameters, the R3041 employs feedback from its SysClk output to the internal bus interface unit. This allows the R3041 to reference input signals to the reference clock seen by the external system. The SysClk output is designed to provide relatively large AC drive to minimize skew due to slow rise or fall times. A typical part will have less than 2ns rise or fall (10% to 90% signal times) when driving the test load. Therefore, the system designer should use care when designing for direct SysClk use. Total loading (due to devices connected on the signal net and the routing of the net itself) should be minimized to ensure the SysClk output has a smooth and rapid transition. Long rise and/or fall times may cause a degradation in the speed capability of an individual device. Similarly, the R3041 employs feedback on its ALE output to ensure adequate address hold time to ALE. The system designer should be careful when designing the ALE net to minimize total loading and to minimize skew between ALE and the A/D bus, which will ensure adequate address access latch time. IDT's field and factory applications groups can provide the system designer with assistance for these and other design issues. Airflow (ft/min) ØCA 0 200 400 600 800 1000 "J" Package 29 26 21 18 16 15 TQFP 55 40 35 33 31 30 2905 tbl 02 Table 2. Thermal Resistance (ØCA) at Various Airflows |
Similar Part No. - 79R3041-25J |
|
Similar Description - 79R3041-25J |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |