DSP56721 datasheet(12/54 Pages) FREESCALE

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SymphonyTM DSP56720 / DSP56721 Multi-Core Audio Processors, Rev.1

Freescale Semiconductor

2.1.5

AC Electrical Characteristics

The timing waveforms shown in the AC electrical characteristics section are tested with a VIL maximum of 0.8 V and a VIH

minimum of 2.0 V for all pins. AC timing specifications, which are referenced to a device input signal, are measured in

production with respect to the 50% point of the respective input signal’s transition. DSP56720/DSP56721 output levels are

measured with the production test machine VOL and VOH reference levels set at 0.4 V and 2.4 V, respectively.

2.1.6

Internal Clocks

Internal clock characteristics are listed in Table 7.

Internal supply current1 (core only) at internal clock of

200 MHz

• In Normal mode

ICCI

–

190

780

• In Wait mode

ICCW

–

680

• In Stop mode2

ICCS

–

640

Input capacitance

CIN

––

Notes:

The Current Consumption section provides a formula to compute the estimated current requirements in Normal mode. In order

to obtain these results, all inputs must be terminated (i.e., not allowed to float). Measurements are based on synthetic intensive

DSP benchmarks. The power consumption numbers in this specification are 90% of the measured results of this benchmark. This

reflects typical DSP applications. Typical internal supply current is measured with VCORE_VDD = 1.0V, VDD_IO = 3.3V at TJ = 25°C.

Maximum internal supply current is measured with VCORE_VDD = 1.10V, VIO_VDD) = 3.6V at TJ = 125°C.

In order to obtain these results, all inputs, which are not disconnected at Stop mode, must be terminated (i.e., not allowed to float).

Table 7. Internal Clocks

No.

Characteristics

Symbol

Min

Typ

Max

Unit

Condition

Comparison Frequency

Fref

–

MHz

Fref = Fin/NR

Input Clock Frequency

Fin

Max = 200 MHz

PLL VCO Frequency

Fvco

200

–

400

MHz

Fvco = (Fin * NF)/NR

Output Clock Frequency[1]

• with PLL enabled

• with PLL disabled

Fout

–

200

MHz

Fout= Fvco/NO

Fout = Fin

Duty Cycle

–

Fvco=

200 MHz – 400 MHz

Notes:

Fin = External frequency, NF = Multiplication Factor, NR = Predivision Factor, NO = Output Divider

Table 6. DC Electrical Characteristics (Continued)

Characteristics

Symbol

Min

Typ

Max

Unit

DSP56721 Datasheet(PDF) 12 Page - Freescale Semiconductor, Inc

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