MPC972FA Freescale Semiconductor, MPC972FA Datasheet - Page 7

• Manufacturer Part Number: MPC972FA
• Description: IC PLL CLOCK DRIVER 52-LQFP
• Manufacturer: Freescale Semiconductor
• Type: Clock Driver, Fanout Distribution, Multiplexerr

Specifications of MPC972FA

• Pll: Yes with Bypass
• Input: LVCMOS, LVTTL
• Output: LVCMOS
• Number Of Circuits: 1
• Ratio - Input:output: 4:12
• Differential - Input:output: No/No
• Frequency - Max: 125MHz
• Divider/multiplier: Yes/No
• Voltage - Supply: 3.135 V ~ 3.465 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 52-LQFP
• Frequency-max: 125MHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

SYNC Output Description
integer multiples of each other there is a need for a signal for
system synchronization purposes. The SYNC output of the
MPC972 is designed to specifically address this need. The
MPC972 monitors the relationship between the Qa and the Qc
banks of outputs. It provides a low going pulse, one period in
duration, one period prior to the coincident rising edges of the
In situations where output frequency relationships are not
MOTOROLA
1. Programmable Output Frequency Relationships (VCO_Sel = ‘1’)
2. Programmable Output Frequency Relationships (VCO_Sel = ‘1’)
fsela1
0
0
1
1
fselFB2
0
0
0
0
1
1
1
1
fsela0
0
1
0
1
Figure 5. Typical Phase Jitter versus Reference Frequency
VCO/12
VCO/4
VCO/6
VCO/8
Qa
Figure 4. Typical Skews Relative to QFB
fselFB1
fselb1
0
0
1
1
0
0
1
1
0
0
1
1
I/O Jitter
fselb0
0
1
0
1
Qa and Qc outputs. The duration and the placement of the
pulse is dependent on the higher of the Qa and Qc output
frequencies. The timing diagrams in the data sheet show the
various waveforms for the SYNC output. Note that the SYNC
output is defined for all possible combinations of the Qa and Qc
outputs even though under some relationships the lower
frequency clock could be used as a synchronizing signal.
VCO/10
VCO/4
VCO/6
VCO/8
fselFB0
Qb
0
1
0
1
0
1
0
1
fselc1
0
0
1
1
fselc0
0
1
0
1
VCO/10
VCO/12
VCO/16
VCO/20
VCO/4
VCO/6
VCO/8
VCO/8
QFB
VCO/2
VCO/4
VCO/6
VCO/8
Qc
MPC972
7