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Cypress Semiconductor Electronic Components Datasheet



CY2071AF

Single-PLL General-Purpose EPROM Programmable Clock Generator


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CY2071AF pdf
CY2071A
Single-PLL General-Purpose
EPROM Programmable Clock Generator
Features
Benefits
Single phase-locked loop architecture
Generates a custom frequency from an external source
EPROM programmability
Easy customization and fast turnaround
Factory-programmable (CY2071A, CY2071AI) or field- Programming support available for all opportunities
programmable (CY2071AF, CY2071AFI) device options
Up to three configurable outputs
Generates three related frequencies from a single device
Low-skew, low-jitter, high-accuracy outputs
Meets critical industry standard timing requirements
Internal loop filter
Alleviates the need for external components
Power management (OE)
Supports low-power applications
Frequency select options
3 outputs with 2 user selectable frequencies
Configurable 5V or 3.3V operation
Supports industry standard design platforms
8-pin 150-mil SOIC package
Industry-standard packaging saves on board space
i
Selector Guide
Part Number
CY2071A
CY2071AI
CY2071AF
CY2071AFI
Outputs
Input Frequency Range
3 10 MHz25 MHz (external crystal)
1 MHz30 MHz (reference clock)
3 10 MHz25 MHz (external crystal)
1 MHz30 MHz (reference clock)
3 10 MHz25 MHz (external crystal)
1 MHz30 MHz (reference clock)
3 10 MHz25 MHz (external crystal)
1 MHz30 MHz (reference clock)
Output Frequency Range
500 kHz130 MHz (5V)
500 kHz100 MHz (3.3V)
500 kHz100 MHz (5V)
500 kHz80 MHz (3.3V)
500 kHz100 MHz (5V)
500 kHz80 MHz (3.3V)
500 kHz90 MHz (5V)
500 kHz66.6 MHz (3.3V)
Specifics
Factory Programmable
Commercial Temperature
Factory Programmable
Industrial Temperature
Field Programmable
Commercial Temperature
Field Programmable
Industrial Temperature
Logic Block Diagram for CY2071A
XTALIN
XTALOUT
REFERENCE
OSCILLATOR
PLL
Block
EPROM-
Configurable
Multiplexer
and Divide
Logic
CLKA
CLKB
CLKC
OE / FS
Pin Configuration
CLKA
GND
XTALIN
XTALOUT
8-pin SOIC
Top View
18
27
36
45
OE/FS
VDD
CLKC
CLKB
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
Document #: 38-07139 Rev. *A
Revised December 14, 2002



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CY2071AF pdf
CY2071A
Pin Summary
Name
Number Description
CLKA
1 Configurable Clock Output
GND
XTALIN[1]
XTALOUT[1, 2]
2 Ground
3 Reference Crystal Input or External Reference Clock Input
4 Reference Crystal Feedback
CLKB
5 Configurable Clock Output
CLKC
6 Configurable Clock Output
VDD 7 Voltage Supply
OE / FS
8 Output Control Pin, either Output Enable or Frequency Select Input
(Active-HIGH, internal pull-up resistor to VDD)
Notes:
1. For best accuracy, use a parallel-resonant crystal, CL = 17 pF.
2. Float XTALOUT pin if XTALIN is driven by reference clock (as opposed to an external crystal).
Functional Description
The CY2071A is a general-purpose clock synthesizer de-
signed for use in applications such as modems, disk drives,
CD-ROM drives, video CD players, games, set-top boxes, and
data/telecommunications. The device offers up to three con-
figurable clock outputs in an 8-pin, 150-mil SOIC package and
can operate off either a 3.3V or 5V power supply. The on-chip
reference oscillator is designed for 10-MHz to 25-MHz crys-
tals. Alternatively, an external reference clock of frequency be-
tween 1 MHz and 30 MHz can be used.
The CY2071A has one PLL and outputs three factory-EPROM
configurable clocks: CLKA, CLKB, and CLKC. The output
clocks can originate either from the PLL or the reference, or
selected dividers thereof. Additionally, pin 8 can be configured
to be an Output Enable or a Select input.
The CY2071A can replace multiple Metal Can Oscillators
(MCO) in a synchronous system, providing cost and board
space savings to the manufacturer. Hence, these devices are
ideally suited for applications that require multiple, accurate,
and stable clocks synthesized from low-cost generators in
small packages. A hard-disk drive is an example of such an
application. In this case, CLKA drives the PLL in the Read
Controller, while CLKB and CLKC drive the MCU and associ-
ated sequencers.
CyClocks™ Software
CyClocks is an easy-to-use software application that allows
you to configure any one of the EPROM-Programmable
Clocks offered by Cypress. You may specify the input frequen-
cy, PLL and output frequencies, and different functional op-
tions. Please note the output frequency ranges in this data
sheet when specifying them in CyClocks to ensure that you
stay within the limits. You can download a copy of CyClocks
free on the Cypress Semiconductor website at www.cy-
press.com.
Consider using the CY2081 for applications that require unre-
lated output frequencies. Consider using the CY2291,
CY2292, or CY2907 for applications that require more than
three output clocks.
Cypress FTG Programmer
The Cypress Frequency Timing Generator (FTG) Programmer
is a portable programmer designed to custom program our
family of EPROM Field Programmable Clock Devices. The
FTG programmers connect to a PC serial port and allow users
of CyClocks software to quickly and easily program any of the
CY2291F, CY2292F, CY2071AF, and CY2907F devices. The
ordering code for the Cypress FTG Programmer is CY3670.
Maximum Ratings
(Above which the useful life may be impaired. For user guide-
lines, not tested.)
Supply Voltage ...............................................0.5V to +7.0V
DC Input Voltage ..................................... 0.5V to VDD+0.5V
Storage Temperature ................................. 65°C to +150°C
Max. Soldering Temperature (10 sec) ..........................260°C
Junction Temperature...................................................150°C
Static Discharge Voltage............................................ >2000V
(per MIL-STD-883, Method 3015)
Document #: 38-07139 Rev. *A
Page 2 of 8



Part Number CY2071AF
Description Single-PLL General-Purpose EPROM Programmable Clock Generator
Maker Cypress Semiconductor - Cypress Semiconductor
Total Page 8 Pages
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