CY2037_09 Datasheet, PDF (1/11 Pages) Cypress Semiconductor – High-Accuracy EPROM Programmable PLL Die for Crystal Oscillators

CY2037
High-Accuracy EPROM Programmable
PLL Die for Crystal Oscillators
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 2-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 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
C_Load 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 because PLL may be programmed to
a high frequency using a low frequency, low cost crystal
■ Duty cycle centered at 1.4V or V_DD/2
■ Provides flexibility to service most TTL or CMOS applications
■ Provides flexibility in output configurations and testing
■ Enables low power operations or output enable functions
■ Enables two frequency options for meeting different industry
standards, that is, PAL/NTSC
■ Provides flexibility for system applications through selectable
instantaneous or synchronous change in outputs
■ Suitable for most PC, consumer, and networking applications
■ Lowers inventory costs because the same die services both
applications
■ Enables encapsulation in small size, surface mount packages
■ Has lower EMI than oscillators
Table 1. Device Functionality: Output Frequencies
Parameter
Description
Fo
Output frequency
Condition
V_DD = 4.5V–5.5V
V_DD = 3.0V–3.6V
V_DD = 2.7V–3.0V
Min
Max
Unit
1
133
MHz
1
100
MHz
1
66
MHz
Note
1. CY2037A and CY2037B are identical. However, CY2037B is recommended for all new designs.
Cypress Semiconductor Corporation • 198 Champion Court
Document Number: 38-07354 Rev. *E
• San Jose, CA 95134-1709 • 408-943-2600
Revised March 06, 2008
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