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5V7855SWFR Scheda tecnica(PDF) 1 Page - Integrated Device Technology |
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5V7855SWFR Scheda tecnica(HTML) 1 Page - Integrated Device Technology |
1 / 14 page DATA SHEET IDT5V7855-DPK REVISION A MARCH 11, 2010 1 ©2010 Integrated Device Technology, Inc. EEPROM Programmable PLL Die for LVCMOS Crystal Oscillator IDT5V7855 General Description The IDT5V7855 is a programmable PLL-based clock generator used for crystal oscillator modules. The device incorporates an on-chip crystal oscillator with a programmable capacitor tuning array to support direct connection with fundamental-mode crystals between 16MHz – 50MHz. The capacitor tuning array offers a total of 9 bits of resolution and provides a step of 0.01pF. The device incorporates on-chip non-volatile EEPROM cells which can store all the device settings and maintain them even when there is no power. The serial programming interface is implemented with dual-use pins for the clock and data. The CONT input can be programmed as either a power down input or an output enable input. Crystal oscillator modules using this device can be stocked as blank parts and custom frequencies programmed in package at the last stage before shipping. This enables fast-turn manufacture of custom and standard crystal oscillators without the need for expensive dedicated crystals. The IDT PLL uses a patent-pending fractional multiplier technique to provide ultra-high resolution multiplication and division from input to output with low jitter. In addition, prescaler and post- divider circuits are included to enhance the granularity of clock scaling. The PLL may also be bypassed in order to operate the device as a non-PLL fundamental-mode crystal oscillator for applications that do not require frequency multiplication. The device is fabricated using advance technology and can support both 2.5V and 3.3V operation. The device is small enough to fit into small-footprint crystal oscillators. This is the industry’s smallest programmable die and can support crystal oscillator packages as small as 20mm x 16mm. Features • Input: 16MHz – 50MHz fundamental mode crystal • Output frequency range: 1MHz – 170MHz in PLL mode, 1MHz – 50MHz in non-PLL mode • On-chip EEPROM to store device configuration – 19-bit high-resolution fractional programmable multiplier – 3-bit prescaler – 7-bit output divider – 9-bit crystal oscillator tuning capacitor array – Selectable function power down or OE control pin • In-package serial programming interface through dual-use pins • Full 2.5V and 3.3V operating supply • Maximum frequency shift across supply voltage: ±1ppm • Available in die pack, lead-free RoHS compliant • ESD Human Body Model (HBM) and Machine Model (MM): – HBM: 2000V – MM: 200V • Small die size: 0.75mm x 0.75mm • Supports 20mm x 16mm package size • -40°C to 85°C ambient operating temperature Tuning Cap 9-bit 19-bit 7-bit OUT CONT xd xg 3-bit Fractional Multiplier Output Divider Pre-Scaler VCO PFD OSC EEPROM Pullup x2 ÷2 0 1 Functional Block Diagram CONT xg xd VDD OUT VSS VDD 1 2 3 4 5 7 6 8 IDT5V7855 0.75mm x 0.75mm Die Pad Assignment |
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