PI7C9X798ME - 8-Channel UART Bridge | Diodes Incorporated
MPN: PI7C9X798ME ✓ ActivePI7C9X798ME Overview
A UART is a serial communication interface that converts parallel data from a processor or controller into a framed serial stream and receives framed serial data in parallel form. Within the interface-controller hierarchy, a multi-channel UART bridge extends the basic UART function across eight channels, allowing one integrated circuit to connect a host system to multiple serial endpoints. This integration can reduce the number of discrete interface devices and simplify control of communications equipment.
The PI7C9X798 family's global interrupt source register provides interrupt-status information for all eight channels, helping firmware identify the source of an interrupt more quickly. Its 1.62 V to 3.6 V core supply range supports low-voltage embedded systems, while the 5 V-tolerant serial inputs broaden its usefulness in boards that expose older modem or serial interfaces. The operating architecture is designed around a 16C550-compatible octal UART, as identified by the distributor product listings.
Typical uses include industrial serial concentrators, multi-port communications equipment, data acquisition systems, embedded control platforms, and legacy peripheral bridges. In a multi-channel design, the PI7C9X798ME can terminate several serial links while presenting a consolidated device to the host processor. Designers should confirm channel-clocking, interrupt, electrical-interface, and protocol requirements against the complete manufacturer datasheet before releasing a PCB.
Layout planning is especially important for a 100-lead MQFP because its fine pitch requires careful escape routing and reliable assembly processes. Input and output interfaces must also satisfy the voltage limits of the target serial links. Although the core operates below 3.6 V, the stated 5 V tolerance applies specifically to the serial modem inputs and should not be generalized to every supply or control pin.
This page combines verified distributor pricing, package information, family-level specifications, practical integration considerations, and verified-source links. It also distinguishes confirmed product attributes from electrical details that still require confirmation from the manufacturer datasheet, helping engineers evaluate the PI7C9X798ME without filling missing data with assumptions.
Drop-in alternatives for PI7C9X798ME — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
No drop-in alternatives available for this product.
Request AlternativesPI7C9X798ME Maximum Ratings & Electrical Characteristics
| Product Type | Octal UART bridge controller |
| UART Channels | 8 channels |
| Core Supply Voltage Range | 1.62 V to 3.6 V |
| Serial Modem Input Tolerance | 5 V tolerant |
| UART Compatibility | 16C550-compatible |
| Interrupt Architecture | Global interrupt source register for all 8 channels |
| Package | 100-MQFP |
| Package Dimensions | 14 mm x 20 mm |
| Pin Count | 100 pins |
| Mounting Type | Surface mount |
| LCSC Unit Price | $14.4654 |
| Heisener Unit Price | $36.0747 |
| Heisener Listed Inventory | 6,528 pieces |
| Heisener Lead Time | To be confirmed |
PI7C9X798ME 14 mm x 20 mm Pin Configuration Guide
Pin configuration for PI7C9X798ME (14 mm x 20 mm package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for PI7C9X798ME.
Refer to the datasheet for full pin configuration.
Typical Applications
PI7C9X798ME is suitable for 6 applications: Industrial Serial Concentrator, Multi-Port Data Acquisition System, Embedded Communications Controller, Legacy Peripheral Bridge, Network Equipment Serial Management, Automated Test Equipment.
Industrial Serial Concentrator
The PI7C9X798ME fits an industrial serial concentrator because eight 16C550-compatible UART channels can terminate multiple equipment interfaces within one controller. Its global interrupt source register identifies status across all eight channels, which can reduce the work required to determine which serial endpoint needs service. The 1.62 V to 3.6 V operating range is appropriate for modern embedded control boards, while 5 V-tolerant serial modem inputs simplify interfacing with selected legacy equipment. The 100-MQFP package concentrates the eight channels but requires a fine-pitch assembly process and careful PCB routing. Industrial deployment still requires confirmation of the operating temperature range, electrical isolation strategy, surge protection, and EMC performance before the design is released for factory use.
Multi-Port Data Acquisition System
A multi-port data acquisition system can use the PI7C9X798ME to consolidate eight serial measurement channels into a single interface device. The 16C550-compatible UART organization is useful when legacy instruments or embedded sensors rely on established serial framing and register behavior. Eight channels reduce the number of separate UART controllers and associated board areas, while the global interrupt source helps firmware rapidly identify the channel associated with an event. The device's 1.62 V to 3.6 V supply range suits low-voltage processing platforms, and the 5 V-tolerant serial inputs offer additional integration flexibility. Signal conditioning, isolation, grounding, and protocol compatibility must be designed around each transducer rather than inferred from the UART controller itself.
Embedded Communications Controller
The PI7C9X798ME is suitable for an embedded communications controller that must manage several low-speed serial links alongside a host processor. Its eight channels permit concurrent connections to modems, sensors, service ports, or peripheral controllers without allocating eight unrelated interface circuits. A global interrupt source register containing information for all eight channels supports faster interrupt parsing in interrupt-driven firmware. The low-voltage core range of 1.62 V to 3.6 V integrates readily with embedded processors, while 5 V-tolerant modem inputs may simplify mixed-generation board designs. Firmware must still verify channel-specific clocking, interrupt masking, framing, and electrical drive requirements against the complete manufacturer documentation.
Legacy Peripheral Bridge
A legacy peripheral bridge can use the PI7C9X798ME when several 16C550-style serial devices must be connected to a modern controller. The octal arrangement preserves familiar UART behavior across eight endpoints and centralizes the related interface logic in one 100-MQFP device. This is useful when an existing peripheral architecture exposes multiple DB9-style, modem, or industrial serial interfaces but the host board needs a more compact implementation. The 5 V-tolerant serial modem inputs are relevant when interfacing with established voltage levels. Designers should add the required line drivers, receivers, connectors, and protection externally, and they should not assume that the controller's logic pins carry the same tolerance as its serial inputs.
Network Equipment Serial Management
PI7C9X798ME can support serial-management functions in communications equipment where a chassis controller must access multiple internal modules. Eight UART channels provide a practical way to connect supervisory processors, line cards, fan controllers, or service interfaces through independent serial links. The global interrupt source across all eight channels lets a supervisory firmware routine narrow an event to the relevant channel more efficiently than polling every port independently. The 1.62 V to 3.6 V operating supply range supports low-voltage logic integration, and the 5 V-tolerant modem inputs can simplify links to selected legacy modules. For telecommunications equipment, however, system-level requirements such as temperature range, radiation, reliability history, and safety standards must be checked against the manufacturer datasheet.
Automated Test Equipment
In automated test equipment, the PI7C9X798ME can provide eight serial control ports for instruments, fixtures, or programmable modules. Consolidating these links into one interface IC frees board space and gives test software a consistent 16C550-compatible UART resource across channels. The global interrupt source register is valuable when multiple instruments may request service simultaneously because it identifies which channel generated the interrupt. The controller's low-voltage operation and 5 V-tolerant serial inputs support mixed voltage domains, subject to per-pin verification. Test-system designers must add isolation and buffering where instrument ground references differ, and they must confirm the supported clock and baud-rate limits in the datasheet before selecting it for high-throughput production fixtures.
Engineering reference data for PI7C9X798ME — comparison, design guidance, and compliance information.
Selection Guide
Design Notes
Treat the PI7C9X798ME as a fine-pitch, 100-lead surface-mount design. Confirm the land pattern and assembly process against the package drawing before layout release. Route escape lines on the host board with adequate spacing for the board's fabrication capability, and place decoupling capacitors near the relevant supply pins once their identities and connection requirements are confirmed from the manufacturer pinout.
Do not apply the stated 5 V tolerance to every pin. The verified family description applies it to serial modem inputs; the device core operates from 1.62 V to 3.6 V. Separately verify all control, interrupt, clock, and I/O pins. Also avoid treating the global interrupt source as a complete register map, because the supplied source does not provide channel-specific timing, interrupt-clearing, or parity-handling instructions.
Plan the board with clear separation between external serial interfaces and sensitive clock or control routing. If any channel connects to noisy or long external cables, add the appropriate line drivers or receivers, protection, grounding, and isolation at the connector rather than relying on the UART controller alone. Because the device combines eight channels, inconsistent return paths can create ground offsets and data errors even when the core supply is well regulated.
Compliance Information
The supplied verified search results do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. No compliance claim has been inferred from the distributor listings.
