TMS320VC5470ZHKA datasheet(55/94 Pages) TI

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Electrical Specifications

December 2001 − Revised December 2002

SPRS017B

6.4

Package Thermal Resistance Characteristics

Table 6−1 provides the thermal resistance characteristics for the recommended package type used on the

TMS320VC5470 DSP.

Table 6−1. Thermal Resistance Characteristics

PARAMETER

GHK PACKAGE

UNIT

RΘJA

°C/W

RΘJC

9.5

°C/W

6.5

Timing Parameter Symbology

Timing parameter symbols used are created in accordance with JEDEC Standard 100. To shorten the

symbols, some of the pin names and other related terminology have been abbreviated as follows:

Lowercase subscripts and their meanings:

Letters and symbols and their meanings:

access time

High

cycle time (period)

Low

delay time

Valid

dis

disable time

High impedance

enable time

fall time

hold time

rise time

setup time

transition time

valid time

pulse duration (width)

Unknown, changing, or don’t care level

The following load circuit in Figure 6−1 was used on all outputs pins and I/O pins in input mode. All timing

measurements in this data manual were measured from the 5470 connection to the following load circuit.

Tester Pin

Electronics

VLoad

IOL

IOH

Output

Under

Test

Ω

Where: IOL

= 8 mA (all outputs)

IOH

= 8 mA (all outputs)

VLoad = 1.65 V

= 13-pF typical load circuit capacitance

Figure 6−1. 3.3-V Test Load Circuit

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