MPC5668X_11 datasheet(56/66 Pages) FREESCALE

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MPC5668x Microcontroller Data Sheet, Rev. 5

Electrical Characteristics

Freescale Semiconductor

MLBSIG/MLBDAT output high

impedance from MLBCLK low

tmcfdz

0—

tmckl

Bus Hold time3

tmdzh

4—

—

MLBSIG/MLBDAT output valid from

MLBCLK rising

tmcrdv

——

• Ground = 0.0V

• Load Capacitance = 60 pF, SIU_PCR144–SIU_PCR146[DSC] = 0b11.

• MLB speed of 256 Fs or 512 Fs (Fs = 48 kHz)

Unless otherwise noted, all timing parameters are specified from the valid voltage threshold in Table 30.

1 The Controller can shut off MLBCLK to place MLB in a low-power state.

2 Pulse width variation is measured at 1.25 V by triggering on one edge of MLBCLK and measuring the spread on the other

edge, measured in ns peak-to-peak (ns p-p).

3 The board must be designed to insure that the high-impedance bus does not leave the logic state of the final driven bit for this

time period. Therefore, coupling must be minimized while meeting the maximum capacitive load listed.

Table 32. MLB Timing for MLB Speed 1024 Fs

Spec

Parameter

Symbol

Min

Typ

Max

Unit

Comments

MLBCLK Operating Frequency1

fmck

45.056

—

49.152

—

49.2544

51.200

MHz

1024 Fs at 44.0 kHz

1024 Fs at 48.0 kHz

1024 Fs at 48.1 kHz

1024 Fs PLL unlocked

MLBCLK rise time

tmckr

——

VIL to VIH

MLBCLK fall time

tmckf

——

VIH to VIL

MLBCLK cycle time

tmckc

—

20.3

—

VIL to VIH

MLBCLK low time

tmckl

6.5

6.1

7.7

7.3

—ns

1024 Fs

PLL unlocked

MLBCLK high time

tmckh

9.7

9.3

10.6

10.2

—ns

1024 Fs

PLL unclocked

MLBCLK pulse width variation2

tmpwv

—

0.7

ns p-p

MLBSIG/MLBDAT input valid to

MLBCLK falling

tdsmcf

1—

—

MLBSIG/MLBDAT input hold from

MLBCLK low

tdhmcf

0—

—

MLBSIG/MLBDAT output high

impedance from MLBCLK low

tmcfdz

0—

tmckl

Bus Hold time3

tmdzh

2—

—

MLBSIG/MLBDAT output valid from

MLBCLK rising

tmcrdv

——

• Ground = 0.0V

• Load Capacitance = 40 pF, SIU_PCR144–SIU_PCR146[DSC] = 0b00.

• MLB speed = 1024Fs (Fs = 48 kHz)

• Unless otherwise noted, timing parameters are specified from the valid voltage threshold in Table 30.

Table 31. MLB Timing for MLB Speed 256 Fs or 512 Fs (continued)

Spec

Parameter

Symbol

Min

Typ

Max

Unit

Comments

MPC5668X Datasheet(PDF) 56 Page - Freescale Semiconductor, Inc

MPC5668X Datasheet(HTML) 56 Page - Freescale Semiconductor, Inc

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