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VOS (max)

VIH (min)

Minimum

Risetime

Waveform

Valid Region

t = 0.3 TC (max) (A)

Ground

tc = the peripheral cycle time.

t = 0.3 TC (max) (A)

VIL (max)

Ground

VUS (max)

tc = the peripheral cycle time.

TMS320DM643

Video/Imaging Fixed-Point Digital Signal Processor

SPRS269C – FEBRUARY 2005 – REVISED JANUARY 2007

5.1.1.2 AC Transient Rise/Fall Time Specifications

Figure 5-4 and Figure 5-5 show the AC transient specifications for Rise and Fall time. For device-specific

information on these values, refer to the Recommended Operating Conditions section of this Data Sheet.

Figure 5-4. AC Transient Specification Rise Time

Figure 5-5. AC Transient Specification Fall Time

5.1.1.3

Signal Transition Rates

All timings are tested with an input edge rate of 4 Volts per nanosecond (4 V/ns).

5.1.1.4

Timing Parameters and Board Routing Analysis

The timing parameter values specified in this data sheet do not include delays by board routings. As a

good board design practice, such delays must always be taken into account. Timing values may be

adjusted by increasing/decreasing such delays. TI recommends utilizing the available I/O buffer

information specification (IBIS) models to analyze the timing characteristics correctly. To properly use IBIS

models to attain accurate timing analysis for a given system, see the Using IBIS Models for Timing

Analysis application report (literature number SPRA839). If needed, external logic hardware such as

buffers may be used to compensate any timing differences.

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DM643 Peripheral Information and Electrical Specifications

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