CY2077_08 Datasheet, PDF (1/14 Pages) Cypress Semiconductor – High-accuracy EPROM Programmable Single-PLL Clock Generator

CY2077
High-accuracy EPROM Programmable
Single-PLL Clock Generator
Features
■ High-accuracy PLL with 12-bit multiplier and 10-bit
divider
■ EPROM programmability
■ 3.3V or 5V operation
■ Operating frequency
❐ 390 kHz–133 MHz at 5V
❐ 390 kHz–100 MHz at 3.3V
■ Reference input from either a 10–30 MHz fundamental toned
crystal or a 1–75 MHz external clock
■ EPROM selectable TTL or CMOS duty cycle levels
■ Sixteen selectable post-divide options, using either PLL or
reference oscillator/external clock
■ Programmable PWR_DWN or OE pin, with asynchronous or
synchronous modes
■ Low jitter outputs typically
❐ 80 ps at 3.3V/5V
■ Controlled rise and fall times and output slew rate
■ Available in both commercial and industrial temperature ranges
■ Factory programmable device options
Benefits
■ Enables synthesis of highly accurate and stable output clock
frequencies with zero PPM
■ Enables quick turnaround of custom frequencies
■ Supports industry standard design platforms
■ Services most PC, networking, and consumer applications
■ Lowers cost of oscillator as PLL can be programmed to a high
frequency using either a low-frequency, low-cost crystal, or an
existing system clock
■ Duty cycle centered at 1.5V or V_DD/2
■ Provides flexibility to service most TTL or CMOS applications
■ Provides flexibility in output configurations and testing
■ Enables low-power operation or output enable function and
flexibility for system applications, through selectable instanta-
neous or synchronous change in outputs
■ Suitable for most PC, consumer, and networking applications
■ Has lower EMI than oscillators
■ Suitable to fit most applications
■ Easy customization and fast turnaround
Logic Block Diagram
PWR_DWN
or OE
XTALOUT^[1]
XTALIN
or
external clock
Q
10 bits
HIGH
ACCURACY
PLL
Charge
Pump
VCO
P
12 bits
Configuration
EPROM
MUX
Note
1. When using an external clock source, leave XTALOUT floating.
/ 1, 2, 4, 8, 16, 32, 64, 128
CLKOUT
Cypress Semiconductor Corporation • 198 Champion Court
Document Number: 38-07210 Rev. *C
• San Jose, CA 95134-1709 • 408-943-2600
Revised February 15, 2008
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