单模只有二个计数单元（n r)
双模有三个（r n a)
mc145151和mc145152的区别在于：
1，
interfaces with single–modulus prescalers
the mc145151–2 is programmed by 14 parallel–input data lines for the
n counter and three input lines for the r counter. the device features consist of
a reference oscillator, selectable–reference divider, digital–phase detector, and
14–bit programmable divide–by–n counter.
the mc145151–2 is an improved–performance drop–in replacement for the
mc145151–1. the power consumption has decreased and esd and latch–up
performance have improved.
• operating temperature range: – 40 to 85°c
• low power consumption through use of cmos technology
• 3.0 to 9.0 v supply range
• on– or off–chip reference oscillator operation
• lock detect signal
• ÷ n counter output available
• single modulus/parallel programming
• 8 user–selectable ÷ r values: 8, 128, 256, 512, 1024, 2048, 2410, 8192
• ÷ n range = 3 to 16383
• “linearized” digital phase detector enhances transfer function linearity
• two error signal options: single–ended (three–state) or double–ended
• chip complexity: 8000 fets or 2000 equivalent gates
2，the mc145152–2 is programmed by sixteen parallel inputs for the n and a
counters and three input lines for the r counter. the device features consist of
a reference oscillator, selectable–reference divider, two–output phase detector,
10–bit programmable divide–by–n counter, and 6–bit programmable ÷ a
counter.
the mc145152–2 is an improved–performance drop–in replacement for the
mc145152–1. power consumption has decreased and esd and latch–up
performance have improved.
• operating temperature range: – 40 to 85°c
• low power consumption through use of cmos technology
• 3.0 to 9.0 v supply range
• on– or off–chip reference oscillator operation
• lock detect signal
• dual modulus/parallel programming
• 8 user–selectable ÷ r values: 8, 64, 128, 256, 512, 1024, 1160, 2048
• ÷ n range = 3 to 1023, ÷ a range = 0 to 63• chip complexity: 8000 fets or 2000 equivalent gates
• see application note an980
