DSP56309/D View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

DSP56309/D

24-Bit Digital Signal Processor

Motorola => Freescale 

Freescale Semiconductor, Inc.

AC Electrical Characteristics

2.6 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 the previous table. 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. DSP56309 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.

2.6.1 Internal Clocks

Table 2-4. Internal Clocks, CLKOUT

Characteristics

Symbol

Min

Expression1, 2

Typ

Max

Internal operation frequency and

f

—

(Ef × MF)/

—

CLKOUT with PLL enabled

(PDF × DF)

Internal operation frequency and

f

—

Ef/2

—

CLKOUT with PLL disabled

Internal clock and CLKOUT high

period

TH

• With PLL disabled

—

ETC

—

• With PLL enabled and MF ≤ 4

0.49 × ETC ×

—

0.51 × ETC ×

PDF × DF/MF

PDF × DF/MF

• With PLL enabled and MF > 4

0.47 × ETC ×

—

0.53 × ETC ×

PDF × DF/MF

PDF × DF/MF

Internal clock and CLKOUT low

period

TL

• With PLL disabled

—

ETC

—

• With PLL enabled and MF ≤ 4

0.49 × ETC ×

—

0.51 × ETC ×

PDF × DF/MF

PDF × DF/MF

• With PLL enabled and MF > 4

0.47 × ETC ×

—

0.53 × ETC ×

PDF × DF/MF

PDF × DF/MF

Internal clock and CLKOUT cycle

TC

—

ETC × PDF ×

—

time with PLL enabled

DF/MF

Internal clock and CLKOUT cycle

TC

—

2 × ETC

—

time with PLL disabled

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 detailed discussion

of the PLL.

2-4

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