74FCT388915TBJG8

Series:	74FCT
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Type:	PLL Clock Driver
PLL:	Yes with Bypass
Input:	LVTTL
Output:	LVCMOS, LVTTL
Number of Circuits:	1
Ratio - Input:Output:	2:8
Differential - Input:Output:	No/No
Frequency - Max:	70MHz
Divider/Multiplier:	Yes/Yes
Voltage - Supply:	3 V ~ 3.6 V
Operating Temperature:	0°C ~ 70°C
Mounting Type:	Surface Mount
Package / Case:	28-LCC (J-Lead)
Supplier Device Package:	28-PLCC (11.5x11.5)
Base Part Number:	IDT74FCT388915

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74FCT388915TBJG8 Application Field and Working Principle
Clock/Timing - Clock Generators, PLLs, Frequency SynthesizersThe 74FCT388915TBJG8 is a designed for ultra-low jitter clock generations, jitter attenuation, and frequency synthesis applications. This device combines a fractional-N phase-locked loop (PLL) and a clock synthesis block in a single chip solution to deliver reliable, low-jitter clock synchronization, and spread-spectrum clocking solutions with very flexible options to meet the requirements of various applications.Features:
• System clock generator in a single chip
• Easy-to-use with no external components
• Built-in active loop filter
• Digital Control Interface with up to 8 bits of programmability
• High frequency range (up to 75 MHz)
• Low jitter and phase noise performance
• Spread spectrum options with programmable center frequency, depth, and clock phase
• Low frequency (32 kHz) and metal-oxide-semiconductor frequency synthesizer (MOSFET) options
• Enable/Disable for ease of frequency change
The 74FCT388915TBJG8 is designed to serve a wide range of clock generation and frequency synthesis requirements. Its built-in advanced features include a fractional-N divider, fractional-N synthesizer, VCO control logic and loop filter, as well as high frequency range and low jitter/phase noise performance descriptors.The device operates in four modes: system clock generator, MOSFET frequency synthesizer, low frequency synthesizer and spread spectrum mode. In the system clock generator mode, the device can generate a low jitter clock signal of up to 75 MHz with programmable or fixed frequency and center spread. In the spread spectrum mode, the device can generate a spread spectrum clock signal of up to 75 MHz with programmable center frequency, depth and clock phase down spread. In the MOSFET frequency synthesizer mode, the device can generate a low jitter clock with incremental frequency steps and limited frequency range.In the low frequency synthesizer mode, the device can generate a low jitter clock with low frequency range of up to 32 kHz for system sleep mode and low power operations.The PLL features an active loop filter structure which divides the reference frequency and VCO output frequency via the fractional divider in the block. The PLL filter can be programmed with different bandwidth values to control and eliminate jitter. The filter also provides for a smooth frequency change when the input reference frequency is changed.The 74FCT388915TBJG8 has a digital control interface (DCI) with up to 8 bits of programmability. The DCI can be used to program the device with various parameters to optimize devices’ performance and customize it to meet different application requirements. These parameters include frequency range, center spread, low jitter performance, center spread, and MOSFET frequency synthesis mode.In summary, the 74FCT388915TBJG8 is a single chip solution with built-in advanced features that enables reliable, low jitter clock synchronization and spread spectrum clocking solutions. Its ease of programming and flexibility make it suitable for a wide range of applications including low power system clock generation, jitter attenuation, and frequency synthesis.

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