MPC9653

TIMING SOLUTIONS

3

MOTOROLA

Table 1: PIN CONFIGURATION

Pin

I/O

Type

Function

PCLK, PCLK

Input

LVPECL

PECL reference clock signal

FB_IN

Input

LVCMOS

PLL feedback signal input, connect to QFB

VCO_SEL

Input

LVCMOS

Operating frequency range select

BYPASS

Input

LVCMOS

PLL and output divider bypass select

PLL_EN

Input

LVCMOS

PLL enable/disable

MR/OE

Input

LVCMOS

Output enable/disable (high-impedance tristate) and device reset

Q0-7

Output

LVCMOS

Clock outputs

QFB

Output

LVCMOS

Clock output for PLL feedback, connect to FB_IN

GND

Supply

Ground

Negative power supply (GND)

VCC_PLL

Supply

VCC

PLL positive power supply (analog power supply). It is recommended to use an external RC filter

for the analog power supply pin VCC_PLL. Please see applications section for details.

VCC

Supply

VCC

Positive power supply for I/O and core. All VCC pins must be connected to the positive power

supply for correct operation

Table 2: FUNCTION TABLE

Control

Default

0

1

PLL_EN

1

Test mode with PLL bypassed. The reference clock (PCLK)

is substituted for the internal VCO output. MPC9653 is fully

static and no minimum frequency limit applies. All PLL

related AC characteristics are not applicable.

Selects the VCO outputa

BYPASS

1

Test mode with PLL and output dividers bypassed. The

reference clock (PCLK) is directly routed to the outputs.

MPC9653 is fully static and no minimum frequency limit

applies. All PLL related AC characteristics are not

applicable.

Selects the output dividers.

VCO_SEL

1

VCO

÷ 1 (High frequency range). fREF = fQ0-7 = 4 ⋅ fVCO VCO ÷ 2 (Low output range). fREF = fQ0-7 = 8 ⋅ fVCO

MR/OE

0

Outputs enabled (active)

Outputs disabled (high-impedance state) and reset of

the device. During reset the PLL feedback loop is open.

The VCO is tied to its lowest frequency. The length of

the reset pulse should be greater than one reference

clock cycle (PCLK).

a. PLL operation requires BYPASS=1 and PLL_EN=1.

Freescale Semiconductor, Inc.

For More Information On This Product,

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