High - Accuracy EPROM Programmable
PLL Die for Crystal Oscillators
CY2037
Cypress Semiconductor Corporation
•
198 Champion Court
•
San Jose
, CA 95134-1709
•
408-943-2600
Document #: 38-07354 Rev. *D
Revised February 26, 2007
Features
• EPROM-programmable die for in-package programming of
crystal oscillators
• High resolution PLL with 12-bit multiplier and 10-bit divider
• EPROM-programmable capacitor tuning array with Shadow
register
• Twice programmable die (CY2037A, CY2037B[1] and
CY2037-2).
• Simple 4-wire programming interface
• On-chip oscillator runs from 10–30 MHz fundamental tuned
crystal
• EPROM-selectable TTL or CMOS duty cycle levels
• Operating frequency
— 1–133 MHz at 5V
— 1–100 MHz at 3.3V
— 1–66.6 MHz at 2.7V
• Sixteen selectable post-divide options, using either PLL or
reference oscillator output
• Programmable power down (PD#) or OE pin (CY2037A,
CY2037B, and CY2037-2)
• Frequency Select (CY2037-3)
• Programmable asynchronous or synchronous OE and
power down (PD#) modes (CY2037A, CY2037B and
CY2037-2)
• Low Jitter outputs typically
— < ± 100 ps (pk-pk) at 5V and f>33 MHz
— < ± 125 ps (pk-pk) at 3.3V and f>33 MHz
• 3.3V or 5V operation
• Small Die
• Controlled rise and fall times and output slew rate
Benefits
• Enables quick turnaround of custom oscillators
• Lowers inventory costs through stocking of blank parts
• Enables synthesis of highly accurate and stable output clock
frequencies with zero or low PPM
• Enables fine-tuning of output clock frequency by adjusting
CLoad of the crystal
• Enables reprogramming of programmed part, to correct
errors, and control excess inventory
• Enables programming of output frequency after packaging
• Lowers cost of oscillator as PLL can be programmed to a
high frequency using a low-frequency, low-cost crystal
• Duty cycle centered at 1.4V or VDD/2
• Provides flexibility to service most TTL or CMOS applica-
tions
• Services most PC, networking, and consumer applications
• Provides flexibility in output configurations and testing
• Enables low-power operation or output enable function
• Enables two frequency options for meeting different industry
standards, i.e., PAL/NTSC
• Provides flexibility for system applications, through
selectable instantaneous or synchronous change in outputs
• Suitable for most PC, consumer, and networking applica-
tions
• Lowers inventory cost as same die services both applica-
tions
• Enables encapsulation in small-size, surface mount
packages
• Has lower EMI than oscillators
Note
1. The CY2037A and CY2037B are identical. However, the CY2037B is recommended for all new designs
Table 1. Device Functionality: Output Frequencies
Parameter
Description
Condition
Min.
Max.
Unit
Fo
Output frequency
VDD = 4.5V–5.5V
1
133
MHz
VDD = 3.0V–3.6V
1
100
MHz
VDD = 2.7V–3.0V
1
66
MHz
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