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Product Detailed Parameters
- Description：IC UART CMOS DUAL 40DIP
- Series：-
- Mfr：MaxLinear, Inc.
- Package：Tube
- Features：Internal Oscillator, Timer/Counter
- Number of Channels：2, DUART
- FIFO's：3 Byte
- Protocol：-
- Data Rate (Max)：1Mbps
- Voltage - Supply：5V
- With Auto Flow Control：-
- With IrDA Encoder/Decoder：-
- With False Start Bit Detection：-
- With Modem Control：-
- Mounting Type：Through Hole
- Package / Case：40-DIP (0.600", 15.24mm)
- Supplier Device Package：40-PDIP
- Grade：-
- Qualification：-
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Overview
The XR88C681P/40 is a dual universal asynchronous receiver/transmitter (DUART) integrated circuit manufactured by MaxLinear. It provides two independent serial communication channels within a single package, supporting data rates up to 1 Mbps. The device operates on a supply voltage ranging from 3.3V to 5.5V and features an internal oscillator for clock generation. It includes built-in timer/counters and FIFO buffers with a capacity of 3 bytes per channel. The component is designed for through-hole mounting in a 40-pin Dual In-line Package (DIP), measuring 0.600 inches (15.24mm) in width.
Feature Summary
- Dual independent UART channels for simultaneous serial communication
- Integrated internal oscillator eliminating external clock requirements
- Built-in timer/counter functionality for timing control applications
- On-chip FIFO buffers to manage data flow efficiency
Applications
- Industrial equipment requiring multiple serial interfaces
- Embedded systems with legacy protocol support needs
- Communication modules utilizing standard RS-232 or TTL levels
- Microcontroller-based designs needing additional UART ports
Procurement Notes
This component is officially classified as obsolete and no longer manufactured by MaxLinear. Procurement must rely on existing stock from authorized distributors or third-party suppliers. Verify the authenticity of available units carefully, as obsolescence increases the risk of counterfeit parts. Check for lead-free compliance status if required for specific environmental regulations, noting that original versions may contain lead.
Selection Notes
Select this part only when a through-hole 40-DIP form factor is strictly required for dual UART connectivity. Consider modern surface-mount alternatives if board space allows, as newer DUARTs offer higher integration and lower power consumption. Ensure the 3.3V to 5.5V operating range matches the system logic levels. Evaluate the 1 Mbps maximum data rate against application throughput requirements before finalizing the design choice.
Part Context
The XR88C681P/40 belongs to MaxLinear's legacy UART product line, previously associated with Exar Corporation technologies. It serves as a specialized interface solution for applications demanding reliable asynchronous serial communication without complex external clocking circuits. The 40-DIP package distinguishes it from smaller surface-mount variants, catering to older manufacturing processes or prototyping environments requiring easy manual insertion.
Replacement Considerations
- XR88C681P/40-F
FAQ
What is the maximum data transfer rate supported by the XR88C681P/40?
The device supports a maximum data rate of 1 Mbps for both of its independent UART channels.
Does the XR88C681P/40 require an external clock source?
No, the IC features an internal oscillator, which eliminates the need for an external clock generator.
