PI49FCT805ATQE

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The PI49FCT805ATQE is a member of the PI4–series of five output clock/timing buffers and drivers. It is designed to ac­cept LVTTL, LVCMOS and SSTL­2 clock and data rates up to 200 MHz. It provides multiple advanced func­tion­al­i­ties for clock and data distribution in high per­for­mance modem and telecommunication systems, as well as in computers and peripherals.

The PI49FCT805ATQE features five differential clock outputs with individually selectable drive strength. Each of the five outputs provides low output skew and excellent noise immunity thanks to its differential output structure. It is capable of accepting a variety of differential and single­ended inputs, while different input thresholds accommodate standard CMOS and TTL logic levels.

The PI49FCT805ATQE includes an internal phase­locked loop (PLL) that enables provide adjustable duty cycle outputs. Using the available logic­level inputs (OE1, OE2, RATIO2, CP2 and CP1 pins), the user can program each output for operation in one of three modes.

The device also supports spread spectrum operation for noise in the system environment. The PI49FCT805ATQE is available in two packages. The 48­pin TQFN and the 64­pin TFBGA both feature operating temperature range of –40°C to +85°C.

Some of the common applications that are associated with the PI49FCT805ATQE include:

• Networking applications
• High­speed systems
• Clocks for digital signal processors (DSPs)
• Spread spectrum clocking
• High­speed microprocessor and bus clocking

The PI49FCT805ATQE has two separate supply rails. The first rail (VCC) is used to power the device, while the second rail (VCCO) is used to power the outputs. The VCCO rail should be at least 0.3 V higher than the VCC rail for proper device operation. Additionally, the device requires a bypass capacitor connected between the VCC and GND pins.

The PI49FCT805ATQE operates by using a Programmable Logic Array (PLA), allowing the user to customize the device’s output behavior. The PLA provides a robust circuit design, making the device more reliable and durable. The PLA also makes it possible to program the device using logic level inputs. The input signals are used to select the output drive strength, the output frequency, and the other output features.

The outputs of the PI49FCT805ATQE have a selectable drive strength. The drive strength is specified in terms of mA, and is selected by tying the appropriate control pins to either VCC or GND. The device supports two output drive strengths, which are 2 mA and 4 mA. Additionally, the outputs can be enabled or disabled by tying the OE2 and OE1 pins to VCC or GND.

The PI49FCT805ATQE is designed for use in high­performance modem, telecom systems, and computer and peripherals applications. It is capable of accepting a variety of differential and single­ended inputs, while providing low output skew and excellent noise immunity. Its two separate supply rails make it well­suited for use in high­speed systems, while its PLL feature makes it ideal for spread spectrum applications. Additionally, its programmable output features enable the user to customize the device’s behavior, allowing them to achieve the desired performance.

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