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Home > Products > Integrated Circuits (ICs) > Interface > Controllers

Diodes Incorporated PI7C9X762CLEX

Name: PI7C9X762CLEX
Brand: Diodes Incorporated
SKU: PI7C9X762CLEX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PI7C9X762CLEX

Manufacturer:: Diodes Incorporated

Category:: Controllers

Package:: 28-TSSOP (0.173", 4.40mm Width)

Datasheet:: PI7C9X762CLEX.pdf

Description:: IC I2C/SPI TO UART 28TSSOP 3K

Quantity:: RFQ Add To RFQ list

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Inventory:1,506

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Product details

Overview

PI7C9X762CLEX from Diodes Incorporated is a dual-channel I²C-bus/SPI-to-UART bridge controller with 64-byte TX/RX FIFOs, backward-compatible register mapping to the 16C450 UART, and support for hardware/software flow control, RS-485 direction control, and IrDA SIR up to 1.152 Mbps. It operates across 1.8V/2.5V/3.3V supplies and delivers up to 33 Mbps SPI interface speed in industrial temperature range (−40°C to +85°C), targeting embedded serial gateway applications.

For engineers reviewing the PI7C9X762CLEX datasheet, PI7C9X762CLEX pinout, PI7C9X762CLEX application, or PI7C9X762CLEX equivalent, key selection criteria include dual UART channel independence, programmable FIFO trigger levels, automatic RS-485 driver control via RTS, GPIO flexibility (8 pins), and compatibility with legacy 16C450 software stacks.

Technical Context

The PI7C9X762CLEX implements two independent UART channels (A and B), each with full-duplex operation, fractional baud rate generation, and configurable character framing (5–8 bit, parity, stop bits). Its register set mirrors the industry-standard 16C450, enabling drop-in firmware reuse while adding enhanced features like TLR-programmable FIFO thresholds and EFR-controlled flow modes.

It supports dual interface modes: I²C-bus slave mode (fast-mode, up to 400 kHz) and SPI slave mode (Mode 0, up to 33 MHz), selected by the I2C/SPI pin. Clocking options include internal crystal oscillator (up to 24 MHz) or external clock (up to 64 MHz), with separate XTAL1/XTAL2 pins and integrated oscillator circuitry.

Key Specifications

Parameter	Value and Actual Design Meaning
Interface Support	I²C-bus slave (fast-mode) or SPI slave (Mode 0, ≤33 MHz); mode selected by dedicated I2C/SPI pin
UART Channels	Dual independent full-duplex UARTs (Channel A and Channel B), each with 64-byte TX/RX FIFOs
Baud Rate Range	Up to 16 Mbps (4× sampling clock); fractional divisor (1–65535) enables precise rate matching
FIFO Trigger Levels	Programmable per channel via Trigger Level Register (TLR); overrides default FCR-selectable levels
GPIO Pins	Eight user-programmable I/O pins, configurable as general-purpose or modem control signals (DSR/DTR/CD/RI)
RS-485 Control	Hardware-driven direction control via RTS output with polarity inversion option; no external transceiver logic required
IrDA Support	Integrated encoder/decoder for SIR physical layer at 115.2 kbps (standard) or 1.152 Mbps (optional)

Pinout & Package

PI7C9X762CLEX is housed in a 32-pin TQFN (ZH) package with exposed thermal pad (VSS-connected center pad), RoHS-compliant and halogen-free. Pin 1 index is marked on top-side silkscreen; recommended PCB layout includes thermal via array under center pad.

Pin/Terminal	Circuit Role	Design Meaning
1, 5, 13, 28	VDD	Primary power supply pins (1.8V/2.5V/3.3V); decoupling capacitors required near each VDD entry
12, 21, 29, Center Pad	VSS	Ground reference; center pad must be soldered to PCB ground plane for thermal and EMI performance
6	I2C/SPI	Interface select: HIGH = I²C mode, LOW = SPI mode; determines function of SCL/SCLK, SDA/SI/SO pins
7	CS/A0	SPI chip select (active LOW) or I²C address bit A0; used with A1 (Pin 8) to configure I²C slave address
14	IRQ	Open-drain interrupt output (active LOW); requires external pull-up (1 kΩ @ 3.3V); asserts on FIFO, error, or modem events
30, 16	RTSA / RTSB	Active-LOW request-to-send outputs per channel; auto-controlled during hardware flow control (EFR[6])
31, 15	CTSA / CTSB	Active-LOW clear-to-send inputs per channel; enable Auto-CTS when EFR[7] = 1; status readable via MSR[4]
17–20, 24–27	GPIO0–GPIO7	Bi-directional I/O pins; configurable as DSR/DTR/CD/RI modem signals or generic digital I/O via GPIO registers

Key Features

Feature	Design Value
16C450 Register Compatibility	Enables direct reuse of existing UART drivers and BIOS-level code without modification
Auto RS-485 Direction Control	Eliminates need for external logic or delay timers; RTS toggles driver enable synchronously with data transmission
Programmable Xon/Xoff Characters	Two independent Xon/Xoff pairs (Xon1/Xoff1, Xon2/Xoff2) allow asymmetric flow control per channel or protocol negotiation
Software Reset Capability	UART core reset initiated via register write (LCR[7]=1, then LCR[7]=0); no dependency on external RESET pin timing
Low Standby Current	Typical 1 µA at 3.3V; critical for battery-operated devices requiring extended sleep duration between serial bursts

Applications

Industrial Serial Gateway

RS-485 Sensor Network Hub

Use Scenario: Connecting microcontroller I²C bus to multiple Modbus RTU field devices over RS-485.

IC Role / Device Role / Timing Role: Dual UART bridge translating I²C commands into RS-485 frames; handles channel A for master polling and channel B for diagnostics logging.

Use Value: Eliminates need for discrete level shifters and timing-critical bit-banging; built-in RTS-driven RS-485 direction control ensures glitch-free bus arbitration.

Use Scenario: Central node aggregating temperature, pressure, and flow sensor data from 12+ RS-485 nodes in factory automation line.

IC Role / Device Role / Timing Role: UART bridge with 64-byte FIFOs buffering bursty sensor responses; GPIO pins monitor power-fail and watchdog timeout signals.

Use Value: Prevents data loss during high-throughput polling cycles; programmable RX FIFO trigger levels optimize host interrupt frequency vs. latency trade-off.

Embedded Mobile Terminal

Battery-Powered Telematics Module

Use Scenario: Handheld barcode scanner using SPI host interface to communicate with Bluetooth module and thermal printer via separate UART channels.

IC Role / Device Role / Timing Role: SPI-to-dual-UART bridge enabling concurrent BT command exchange and printer data streaming; IRQ pin coordinates DMA transfers.

Use Value: Reduces MCU pin count and firmware complexity; low standby current extends battery life between scanning sessions.

Use Scenario: Vehicle OBD-II telematics unit interfacing CAN bus (via external transceiver) and GPS receiver via UART, powered by 12V battery with LDO regulation.

IC Role / Device Role / Timing Role: Dual UART bridge handling GPS NMEA stream (Channel A) and diagnostic log upload (Channel B); GPIO6/CDA monitors ignition signal.

Use Value: Software reset allows safe UART reinitialization after GPS cold start; IrDA SIR support enables optional infrared firmware update path.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel UART bridge applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SC16IS752IPW	Single 32-pin TSSOP package; 64-byte FIFOs; I²C-only interface (no SPI); no IrDA or RS-485 auto-control	Limited to I²C host systems; lacks GPIO flexibility and RS-485 direction automation	Select when design uses only I²C and requires smaller footprint than QFN; verify GPIO sufficiency for modem signaling
MAX3107CEE+	32-pin TQFN; SPI-only interface; 128-byte FIFOs; integrated voltage regulators; no I²C support	Requires SPI host only; higher integration reduces external LDO count but increases BOM cost	Choose when SPI is mandatory and higher FIFO depth justifies premium pricing; confirm thermal derating for 85°C ambient

Compared with SC16IS752IPW and MAX3107CEE+, the PI7C9X762CLEX uniquely combines I²C/SPI dual-interface flexibility, RS-485 auto-direction control, and eight GPIOs in a single 32-pin TQFN-enabling compact, multi-protocol serial gateways without external glue logic.

Availability

PI7C9X762CLEX is available at Aetrix Electronics and suitable for industrial computing, factory process control, and battery-operated embedded devices requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for PI7C9X762CLEX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and interface solutions for industrial, automotive, and consumer markets.

The PI7C9X762CLEX belongs to Diodes' serial bridge controller product line, designed specifically to simplify migration from legacy 16C450-based systems while adding modern features like dual-interface support, programmable flow control, and RS-485 integration.

FAQ

What interface modes does the PI7C9X762CLEX support, and how is mode selection implemented?

The PI7C9X762CLEX supports both I²C-bus slave mode (fast-mode, up to 400 kHz) and SPI slave mode (Mode 0, up to 33 MHz). Mode selection is controlled by the logic level on the dedicated I2C/SPI pin: HIGH selects I²C mode, LOW selects SPI mode. This pin must be set at power-up and cannot be changed dynamically during operation.

How does the PI7C9X762CLEX handle RS-485 driver direction control without external components?

The device integrates automatic RS-485 driver direction control via its RTS outputs (RTSA/RTSB). When enabled in the Enhanced Features Register (EFR[6]), RTS transitions synchronize precisely with transmit start/stop edges, eliminating bus contention. Polarity inversion (via EFR[5]) accommodates both active-HIGH and active-LOW driver enables.

Can the PI7C9X762CLEX operate from a 1.8V supply, and what are the implications for I/O voltage levels?

Yes, the PI7C9X762CLEX supports 1.8V, 2.5V, and 3.3V VDD operation. All digital I/O pins (including GPIOs, IRQ, RTS/CTS) are fully 1.8V-tolerant and operate at the same VDD voltage-no level-shifting required when interfacing with 1.8V microcontrollers or peripherals.

Is the 16C450 register compatibility of the PI7C9X762CLEX limited to basic functionality, or does it extend to enhanced features?

Register compatibility covers all standard 16C450 addresses and bit definitions-including Line Control (LCR), Interrupt Enable (IER), Line Status (LSR), and Modem Control (MCR)-ensuring full driver compatibility. Enhanced features (e.g., FIFO control, TLR, EFR) reside in extended register space and do not conflict with legacy access patterns.

PI7C9X762CLEX Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Package/Case:: 28-TSSOP (0.173", 4.40mm Width)

Programmable:: Not Verified

Protocol:: I2C

Function:: Bridge, I2C/SPI to UART

Interface:: UART

Standards:: -

Voltage - Supply:: 1.8V, 2.5V, 3.3V

Current - Supply:: -

Operating Temperature:: -40°C ~ 85°C

Supplier Device Package:: 28-TSSOP

Grade:: -

Qualification:: -

PI7C9X762CLEX FAQ

1.How can I place an order for PI7C9X762CLEX through Aetrix?

Please submit a Request for Quotation (RFQ) for PI7C9X762CLEX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for PI7C9X762CLEX reliable?

The price and inventory of PI7C9X762CLEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI7C9X762CLEX is usually 5 days.

3.What payment methods are accepted for PI7C9X762CLEX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI7C9X762CLEX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PI7C9X762CLEX?

PI7C9X762CLEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PI7C9X762CLEX order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for PI7C9X762CLEX?

For technical support, including PI7C9X762CLEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI7C9X762CLEX requirements.

6.How does Aetrix verify that PI7C9X762CLEX is sourced from the original manufacturer or authorized distributors?

All PI7C9X762CLEX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PI7C9X762CLEX meets industry standards.

7.What is the process for return or replacement of PI7C9X762CLEX?

All PI7C9X762CLEX units undergo pre-shipment inspection (PSI). If there is an issue with PI7C9X762CLEX, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The PI7C9X762CLEX part is unused and in its original packaging.

Return procedure for PI7C9X762CLEX:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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