CY2071A(2002) 데이터 시트보기 (PDF) - Cypress Semiconductor

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CY2071A
(Rev.:2002)

Single-PLL General-Purpose EPROM Programmable Clock Generator

Cypress Semiconductor 

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

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