TMS320DM643 datasheet(64/160 Pages) TI

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DM643 Peripheral Information and Electrical Specifications

5.1

Parameter Information

5.1.1

Parameter Information Device-Specific Information

Transmission Line

4.0 pF

1.85 pF

Z0 = 50

Ω

(see note)

Tester Pin Electronics

Data Sheet Timing Reference Point

Output

Under

Test

NOTE: The data sheet provides timing at the device pin. For output timing analysis, the tester pin electronics and its transmission line effects must

be taken into account. A transmission line with a delay of 2 ns or longer can be used to produce the desired transmission line effect. The

transmission line is intended as a load only. It is not necessary to add or subtract the transmission line delay (2 ns or longer) from the data

sheet timings.

Ω

3.5 nH

Device Pin

(see note)

Input requirements in this data sheet are tested with an input slew rate of < 4 Volts per nanosecond (4 V/ns) at the device pin.

Vref = 1.5 V

Vref = VIL MAX (or VOL MAX)

Vref = VIH MIN (or VOH MIN)

TMS320DM643

Video/Imaging Fixed-Point Digital Signal Processor

SPRS269A – FEBRUARY 2005 – REVISED APRIL 2005

Figure 5-1. Test Load Circuit for AC Timing Measurements

The load capacitance value stated is only for characterization and measurement of AC timing signals. This

load capacitance value does not indicate the maximum load the device is capable of driving.

5.1.1.1

Signal Transition Levels

All input and output timing parameters are referenced to 1.5 V for both "0" and "1" logic levels.

Figure 5-2. Input and Output Voltage Reference Levels for AC Timing Measurements

All rise and fall transition timing parameters are referenced to VIL MAX and VIH MIN for input clocks,

VOLMAX and VOH MIN for output clocks.

Figure 5-3. Rise and Fall Transition Time Voltage Reference Levels

5.1.1.2

Signal Transition Rates

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

DM643 Peripheral Information and Electrical Specifications

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