PRELIMINARY
CY2037
High Accuracy EPROM Programmable
PLL Die for Crystal Oscillators
Features
鈥?EPROM-programmable die for in-package programming of
crystal oscillators
鈥?High resolution PLL with 12 bit multiplier and 10 bit divider
鈥?EPROM-programmable capacitor tuning array
鈥?Twice programmable die
鈥?Simple 4-wire programming interface
鈥?On-chip oscillator runs from 10鈥?0 MHz crystal
鈥?EPROM-selectable TTL or CMOS duty cycle levels
鈥?Operating frequency
鈥?1鈥?00 MHz at 5V
鈥?1鈥?00 MHz at 3.3V
鈥?1鈥?6.67 MHz at 2.7V
鈥?Sixteen selectable post-divide options, using either PLL or
reference oscillator output
鈥?Programmable PWR_DWN or OE pin
鈥?Programmable asynchronous or synchronous OE and
PWR_DWN modes
鈥?Low Jitter outputs
鈥?< 鹵100ps (pk-pk) at 5V
鈥?< 鹵125ps (pk-pk) at 3.3V
鈥?3.3V or 5V operation
鈥?Small Die
鈥?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 as PLL can be programmed to a high
frequency using a low-frequency, low-cost crystal
Duty cycle centered at 1.5V or V
DD
/2
Provides flexibility to service most TTL or CMOS applications
Services most PC, networking, and consumer applications
Provides flexibility in output configurations and testing
Enables low-power operation or output enable function
Provides flexibility for system applications, through selectable
instantaneous or synchronous change in outputs
Suitable for most PC, consumer, and networking applications
Lowers inventory cost as same die services both applications
Enables encapsulation in small-size, surface mount packages
Has lower EMI than oscillators
CY2037 Logic Block Diagram
PWR_DWN
or OE
Die Configuration
Top View
V
DD
AV
DD
CONFIGURATION
EPROM
X
D
X
D
N/C
X
G
PWR_DWN
or OE
CLKOUT
1
2
3
4
5
6
7
10
X
G
X
D
X
D
CRYSTAL
OSCILLATOR
HIGH
ACCURACY
PLL
9
8
AV
SS
V
SS
MUX
/ 1, 2, 4, 8, 16, 32, 64, 128
CLKOUT
Cypress Semiconductor Corporation
鈥?/div>
3901 North First Street
鈥?/div>
San Jose
鈥?/div>
CA 95134
鈥?/div>
408-943-2600
December 24, 1997
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