MK1491-06RTR

Overview

The MK1491-06RTR is a clock synthesizer designed for AMD Geode-based computer and portable appliance applications. It accepts a 14.318 MHz crystal input to generate multiple output clocks, including selectable PCI local bus, AC97 audio, 24 MHz, and 48 MHz clocks. The device operates at a maximum frequency of 49.152MHz with a 1:10 input-to-output ratio. It utilizes patented analog PLL techniques and features low EMI capabilities. The component is housed in a 28-QSOP package, supports LVCMOS outputs, and functions within a supply voltage range of 3.15V to 3.45V across an operating temperature of 0°C to 70°C.

Feature Summary

• Generates critical timing for AMD Geode companion chips, including four PCI clocks and AC97 audio support.
• Features a Low EMI Enable pin that reduces electromagnetic interference radiation on PCI clocks.
• Includes multiple power-down modes to minimize power consumption during idle states.
• Provides selectable PCIF functionality on up to two outputs with early PCI clock selectability.

Applications

• AMD Geode-based desktop computers
• Portable appliance systems
• Super I/O and USB controller interfaces requiring 24 MHz or 48 MHz clocks

Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm packaging type. The 'RTR' suffix indicates tape and reel packaging. Confirm lead-free status if required by assembly specifications. Check current product lifecycle status as availability may vary.

Selection Notes

Select this component when designing for AMD Geode platforms requiring integrated clock synthesis. Ensure the design accommodates the 28-pin SSOP/QSOP footprint. Verify that external decoupling capacitors (0.1µF) and series termination resistors (33Ω) are included in the schematic for proper operation.

Part Context

This part belongs to the MK1491-06 family of clock sources manufactured by Renesas Electronics Corporation (formerly IDT/ICS). It serves as a dedicated solution for generating synchronized clock signals for legacy AMD processor architectures.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Evaluate alternative clock synthesizers based on package compatibility and output configuration requirements.