CY2077 Datasheet, PDF (1/13 Pages) Cypress Semiconductor – High-accuracy EPROM Programmable Single-PLL Clock Generator

CY2077
High-accuracy EPROM Programmable
Single-PLL Clock Generator
Features
Benefits
• High-accuracy PLL with 12-bit multiplier and 10-bit
divider
Enables synthesis of highly accurate and stable output clock
frequencies with zero PPM
• EPROM-programmability
Enables quick turnaround of custom frequencies
• 3.3V or 5V operation
Supports industry standard design platforms
• Operating frequency
— 390 kHz–133 MHz at 5V
— 390 kHz–100 MHz at 3.3V
Services most PC, networking, and consumer applications
• Reference input from either a 10–30 MHz fundamental Lowers cost of oscillator as PLL can be programmed to a high
toned crystal or a 1–75 MHz external clock
frequency using either a low-frequency, low-cost crystal, or an
existing system clock
• EPROM-selectable TTL or CMOS duty-cycle levels
Duty cycle centered at 1.5V or V_DD/2
Provides flexibility to service most TTL or CMOS applications
• Sixteen selectable post-divide options, using either PLL Provides flexibility in output configurations and testing
or reference oscillator/external clock
• Programmable PWR_DWN or OE pin, with
asynchronous or synchronous modes
Enables low-power operation or output enable function and
flexibility for system applications, through selectable instanta-
neous or synchronous change in outputs
• Low jitter outputs typically
— 80 ps at 3.3V/5V
Suitable for most PC, consumer, and networking applications
• Controlled rise and fall times and output slew rate
Has lower EMI than oscillators
• Available in both commercial and industrial
temperature ranges
Suitable to fit most applications
• Factory-programmable device options
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
Pin Configuration
Configuration
EPROM
V_DD
XTALOUT
XTALIN
PD/OE
8-pin
Top View
1
8
2
7
3
6
4
5
CLKOUT
V_SS
V_SS
V_SS
MUX
/ 1, 2, 4, 8, 16, 32, 64, 128
Note:
1. When using an external clock source, leave XTALOUT floating.
CLKOUT
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
Document #: 38-07210 Rev. *B
Revised December 07, 2002