CY2037 Datasheet, PDF (1/7 Pages) Cypress Semiconductor – High Accuracy EPROM Programmable PLL Die for Crystal Oscillators

PRELIMINARY
CY2037
High Accuracy EPROM Programmable
PLL Die for Crystal Oscillators
Features
Benefits
• EPROM-programmable die for in-package programming of Enables quick turnaround of custom oscillators
crystal oscillators
Lowers inventory costs through stocking of blank parts
• High resolution PLL with 12 bit multiplier and 10 bit divider Enables synthesis of highly accurate and stable output clock
frequencies with zero or low PPM
• EPROM-programmable capacitor tuning array
• Twice programmable die
Enables fine-tuning of output clock frequency by adjusting
C_Load of the crystal
Enables reprogramming of programmed part, to correct errors,
and control excess inventory
• Simple 4-wire programming interface
Enables programming of output frequency after packaging
• On-chip oscillator runs from 10–30 MHz crystal
Lowers cost of oscillator as PLL can be programmed to a high
frequency using a low-frequency, low-cost crystal
• 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
• Operating frequency
— 1–200 MHz at 5V
— 1–100 MHz at 3.3V
— 1–66.67 MHz at 2.7V
Services most PC, networking, and consumer applications
• Sixteen selectable post-divide options, using either PLL or Provides flexibility in output configurations and testing
reference oscillator output
• Programmable PWR_DWN or OE pin
Enables low-power operation or output enable function
• Programmable asynchronous or synchronous OE and
PWR_DWN modes
Provides flexibility for system applications, through selectable
instantaneous or synchronous change in outputs
• Low Jitter outputs
— < ±100ps (pk-pk) at 5V
— < ±125ps (pk-pk) at 3.3V
Suitable for most PC, consumer, and networking applications
• 3.3V or 5V operation
Lowers inventory cost as same die services both applications
• Small Die
Enables encapsulation in small-size, surface mount packages
• Controlled rise and fall times and output slew rate
Has lower EMI than oscillators
CY2037 Logic Block Diagram
PWR_DWN
or OE
X_G
CRYSTAL
X_D
OSCILLATOR
X_D
HIGH
ACCURACY
PLL
Die Configuration
Top View
CONFIGURATION
EPROM
V_DD 1
AV_DD 2
X_D 3
X_D 4
N/C 5
X_G 6
PWR_DWN 7
or OE
10 CLKOUT
9 AV_SS
8 V_SS
MUX
/ 1, 2, 4, 8, 16, 32, 64, 128
CLKOUT
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
December 24, 1997