MPC93R52

TIMING SOLUTIONS

3

MOTOROLA

Table 1: PIN CONFIGURATION

Pin

I/O

Type

Function

CCLK

Input

LVCMOS

PLL reference clock signal

FB_IN

Input

LVCMOS

PLL feedback signal input, connect to an output

F_RANGE

Input

LVCMOS

PLL frequency range select

FSELA

Input

LVCMOS

Frequency divider select for bank A outputs

FSELB

Input

LVCMOS

Frequency divider select for bank B outputs

FSELC

Input

LVCMOS

Frequency divider select for bank C outputs

PLL_EN

Input

LVCMOS

PLL enable/disable

MR/OE

Input

LVCMOS

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

QA0–4, QB0–3, QC0–1

Output

LVCMOS

Clock outputs

GND

Supply

Ground

Negative power supply

VCCA

Supply

VCC

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

external RC filter for the analog power supply pin VCCA. Please see

applications section for details.

VCC

Supply

VCC

Positive power supply for I/O and core

Table 2: FUNCTION TABLE

Control

Default

0

1

F_RANGE, FSELA, FSELB, and FSELC control the operating PLL frequency range and input/output frequency ratios.

See Table 1 and Table 2 for supported frequency ranges and output to input frequency ratios.

F_RANGE

0

VCO

÷ 1 (High input frequency range)

VCO

÷ 2 (Low input frequency range)

FSELA

0

Output divider

÷ 4

Output divider

÷ 6

FSELB

0

Output divider

÷ 4

Output divider

÷ 2

FSELC

0

Output divider

÷ 2

Output divider

÷ 4

MR/OE

0

Outputs enabled (active)

Outputs disabled (high–impedance state) and

reset of the device. During reset, the PLL

feedback loop is open and the VCO is operating

at its lowest frequency. The MPC93R52 requires

reset after any loss of PLL lock. Loss of PLL

lock may occur when the external feedback path

is interrupted. The length of the reset pulse

should be greater than two reference clock

cycles (CCLK). The device is reset by the

internal power–on reset (POR) circuitry during

power–up.

PLL_EN

0

Normal operation mode with PLL enabled.

Test mode with PLL disabled. CCLK is

substituted for the internal VCO output.

MPC93R52 is fully static and no minimum

frequency limit applies. All PLL related AC

characteristics are not applicable.