IDT79R4650-200DP View Datasheet(PDF) - Integrated Device Technology

Part Name

Description

Manufacturer

IDT79R4650-200DP

Low-Cost 64-bit RISController w/DSP Capability

Integrated Device Technology 

IDT79RC4650™

calculated using the thermal resistance from case to ambient (∅CA) of

the given package. The following equation relates ambient and case

temperatures:

TA = TC - P * ∅CA

where P is the maximum power consumption at hot temperature,

calculated by using the maximum ICC specification for the device.

Typical values for ∅CA at various airflows are shown in Table 6.

∅CA

Airflow (ft/min) 0 200 400 600 800 1000

208 QFP (DP)

21 13 10 9

8

7

Table 6 Thermal Resistance (∅CA) at Various Airflows

Note that the RC4650 implements advanced power management to

substantially reduce the average power dissipation of the device. This

operation is described in the IDT79RC4640 and IDT79RC4650 RISC

Processor Hardware User’s Manual.

Data Sheet Revision History

Changes to version dated September 1995:

AC Electrical Characteristics:

– In System Interface Parameters tables (RC4650 and

RV4650), Data Setup and Data Hold minimums changed.

Changes to version dated March 1997:

Features:

– Added 150 MHz operation frequency.

– Upgraded spec to “final.”

Changes to version dated March 1998:

– Added 200 MHz operation frequency.

Changes to version dated April 1998

Features:

– Changed dhrystone/sec reference

Power Consumption (RV4650):

– Upgraded System Condition Icc active parameters

Clock Parameters:

– Changed MasterClock period to 200MHz

Changes to version dated February 1999

Packaging:

– MQUAD packaging changed to PQUAD (DP)

Changes to version dated June 1999

– Added 267 MHz speed to the RV4650, removed 100MHz from

the RV4650

Changes to version dated July 1999

– Corrected several incorrect references to figures and tables.

Changes to version dated March 2000

– Replaced existing figure in Mode Configuration Interface

Reset Sequence section with 3 reset figures.

– Revised values in System Interface Parameters table.

Changes to version dated April 2001

– In the Data Output and Data Output Hold categories of the

System Interface Parameters tables, changed values in the

Min column for all speeds from 1.0 and 2.0 to 0.

MasterClock

SysAD

SysCmd

ValidOut

ValidIn

RdRdy

WrRdy

Release

Addr Data0 Data1

Write CData CData

Data2 Data3

CData CEOD

Figure 5 RC4650 Block Write Request (64-bit system interface)

10 of 25

April 10, 2001

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