DSP56311VF150 View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

Manufacturer

DSP56311VF150

24-Bit Digital Signal Processor

Freescale Semiconductor 

Specifications

2.4 AC Electrical Characteristics

The timing waveforms shown in the AC electrical characteristics section are tested with a VIL maximum of 0.3 V

and a VIH minimum of 2.4 V for all pins except EXTAL, which is tested using the input levels shown in Note 6 of

Table 2-2. AC timing specifications, which are referenced to a device input signal, are measured in production with

respect to the 50 percent point of the respective input signal’s transition. DSP56311 output levels are measured

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

Note: Although the minimum value for the frequency of EXTAL is 0 MHz, the device AC test conditions are 15

MHz and rated speed.

2.4.1 Internal Clocks

Table 2-4. Internal Clocks

Characteristics

Symbol

Min

Expression

Typ

Internal operation frequency with PLL

f

—

enabled

(Ef × MF)/

(PDF × DF)

Internal operation frequency with PLL

f

—

Ef/2

disabled

Internal clock high period

• With PLL disabled

• With PLL enabled and MF ≤4

TH

—

ETC

0.49 × ETC ×

—

PDF × DF/MF

• With PLL enabled and MF > 4

0.47 × ETC ×

—

PDF × DF/MF

Internal clock low period

• With PLL disabled

• With PLL enabled and

MF ≤4

• With PLL enabled and

MF > 4

TL

—

ETC

0.49 × ETC ×

—

PDF × DF/MF

0.47 × ETC ×

—

PDF × DF/MF

Internal clock cycle time with PLL enabled

TC

—

ETC × PDF ×

DF/MF

Internal clock cycle time with PLL disabled

TC

—

2 × ETC

Instruction cycle time

ICYC

—

TC

Notes: 1. DF = Division Factor; Ef = External frequency; ETC = External clock cycle; MF = Multiplication Factor;

PDF = Predivision Factor; TC = internal clock cycle.

2. See the PLL and Clock Generation section in the DSP56300 Family Manual for a details on the PLL.

Max

—

—

—

0.51 × ETC ×

PDF × DF/MF

0.53 × ETC ×

PDF × DF/MF

—

0.51 × ETC ×

PDF × DF/MF

0.53 × ETC ×

PDF × DF/MF

—

—

—

DSP56311 Technical Data, Rev. 8

2-4

Freescale Semiconductor

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