SY89429A Datasheet, PDF (1/9 Pages) Micrel Semiconductor – PROGRAMMABLE FREQUENCY SYNTHESIZER 25MHz to 400MHz

PROGRAMMABLE
FREQUENCY SYNTHESIZER
(25MHz to 400MHz)
ClockWorks™
SY89429A
FEATURES
s Improved jitter performance over SY89429
s 25MHz to 400MHz differential PECL outputs
s ±25ps peak-to-peak output jitter
s Minimal frequency over-shoot
s Synthesized architecture
s Serial 3 wire interface
s Parallel interface for power-on
s Internal quartz reference oscillator driven by quartz
crystal or PECL source
s PECL output can operate with either +3.3V or +5V
VCC_OUT power supply
s External loop filter optimizes performance/cost
s Applications note (AN-06) for ease of design-ins
s Available in PLCC and SOIC 28-pin packages
PIN CONFIGURATION
DESCRIPTION
The SY89429A is a general purpose, synthesized clock
source targeting applications that require both serial and
parallel interfaces. Its internal VCO will operate over a
range of frequencies from 400MHz to 800MHz. The
differential PECL output can be configured to be the VCO
frequency divided by 2, 4, 8 or 16. With the output configured
to divide the VCO frequency by 2, and with a 16MHz
external quartz crystal used to provide the reference
frequency, the output frequency can be specified in 1MHz
steps.
S_CLOCK
S_DATA
S_LOAD
VCC_QUIET
LOOP _FILTER
LOOP_REF
XTAL1
25 24 23 22 21 20 19
26
18
27
17
28
16
PLCC
1
TOP VIEW
15
2
14
3
13
4
12
5 6 7 8 9 10 11
N[1]
N[0]
M[8]
M[7]
M[6]
M[5]
M[4]
APPLICATIONS
s Workstations
s Advanced communications
s High end consumer
s High-performance computing
s RISC CPU clock
s Graphics pixel clock
s Test equipment
s Other high-performance processor-based
applications
M[0] ¹
M[1] ²
M[2] ³
M[3] ⁴
M[4] ⁵
M[5] ⁶
M[6] ⁷
M[7] ⁸
M[8] ⁹
N[0] ¹⁰
N[1] ¹¹
GND (TTL) ¹²
TEST ¹³
VCC (TTL) ¹⁴
TOP VIEW
SOIC
Z28-1
28 _{P_LOAD}
27 _VCC1
26 _XTAL2
25 _XTAL1
24 _{LOOP_REF}
23 _{LOOP_FILTER}
22 _{VCC_QUIET}
21 _{S_LOAD}
20 _{S_DATA}
19 _{S_CLOCK}
18 _{VCC_OUT}
17 _FOUT
16 _FOUT
15 _GND
Rev.: H Amendment: /0
1
Issue Date: October, 1998