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Diodes Incorporated PI7C9X752FAE
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- Part No.:
- PI7C9X752FAE
- Manufacturer:
- Diodes Incorporated
- Category:
- Controllers
- Package:
- 48-TQFP
- Datasheet:
-
PI7C9X752FAE.pdf
- Description:
- IC BRIDGE DUAL UART 48TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,774
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Product details
Overview
PI7C9X752FAE from Diodes Incorporated is a dual-channel 16C550-compatible UART IC operating from 1.62V to 3.6V with 5V-tolerant serial inputs, 64-byte TX/RX FIFOs per channel, programmable Intel/Motorola bus interface, and integrated IrDA 1.0/1.1 encoder/decoder - deployed in multi-port RS-232/RS-485 communication cards for factory automation systems.
For engineers reviewing the PI7C9X752FAE datasheet, PI7C9X752FAE pinout, PI7C9X752FAE application, or PI7C9X752FAE equivalent, key selection criteria include dual-UART concurrency, 16 Mbps max serial data rate, auto RTS/CTS hardware flow control with hysteresis, RS-485 half-duplex direction control, and 48-QFP package compatibility with legacy industrial host interfaces.
Technical Context
The device implements two independent UART channels, each with fully programmable 16C550 register sets, separate 64-byte transmit and receive FIFOs, and independent trigger-level control for DMA/interrupt generation via TLR, FCR, and FCTR registers. Trigger levels support four tables (A–D), including user-programmable RX/TX thresholds in Table D.
Hardware flow control uses auto-RTS (de-asserted when RX FIFO reaches halt level) and auto-CTS (pauses TX on CTS# HIGH), both configurable per channel with hysteresis. IrDA mode enables infrared encoding/decoding with software-invertible idle polarity, while RS-485 HDX control is driven by DLD[6] and synchronized to TX activity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.62V to 3.63V - supports low-power embedded systems while maintaining 5V tolerance on all modem I/O pins except XTAL1. |
| Max Serial Data Rate | 16 Mbps - achieved with 64 MHz external clock and 4× oversampling, enabling high-throughput serial bridging in network management appliances. |
| FIFO Depth | 64 bytes per channel (TX + RX) - reduces CPU interrupt load and prevents overrun errors during burst data transfers in remote access servers. |
| Bus Interface | Configurable Intel (16-bit) or Motorola (68k-style) - selected via 16/68# pin, enabling drop-in replacement in legacy industrial controllers without PCB redesign. |
| IrDA Support | IrDA 1.0/1.1 encoder/decoder - provides certified infrared physical layer compliance with software-selectable idle polarity for interoperability with legacy peripherals. |
| RS-485 Control | Auto HDX direction output (OPA#/OPB#) - eliminates external transceiver control logic by synchronizing driver enable with TX activity and idle state. |
| Crystal Input | Up to 24 MHz crystal or 80 MHz external clock - allows precise baud rate generation across wide temperature ranges without external PLL. |
Pinout & Package
Package: 48-pin QFP (7 mm × 7 mm, 0.5 mm pitch), RoHS-compliant, lead-free, halogen- and antimony-free "Green" construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TXA / TXB | UART-A/B Transmit Output | Drives serial data or IrDA-encoded signal; idle HIGH in UART mode, LOW in IrDA mode - selectable per channel via MCR[6]. |
| RXA / RXB | UART-A/B Receive Input | Accepts serial or IrDA pulses; normal UART idle HIGH, IrDA idle LOW (invertible in software); requires pull-up if unused. |
| RTSA# / RTSB# | Request-to-Send Output | Active-low RTS controlled automatically during hardware flow control; also usable as general-purpose output when EFR[6]=0. |
| CTSA# / CTSB# | Clear-to-Send Input | Active-low CTS input enabling auto-TX suspension; must be tied to VCC/GND if unused to prevent floating states. |
| INTA / INTB | Channel-A/B Interrupt Output | Open-drain (Motorola mode) or push-pull (Intel mode); active-low interrupt signaling per channel; configurable via MCR[3]. |
| 16/68# | Bus Interface Select | Internal pull-up; HIGH selects Intel mode (IOR#/IOW#), LOW selects Motorola mode (R/W#, IRQ#); determines CS#/CSA#/CSB# mapping. |
| XTAL1 / XTAL2 | Clock Input/Output | XTAL1 accepts 1–24 MHz crystal or up to 80 MHz external clock; XTAL2 provides buffered output for daisy-chaining or monitoring. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Independent UART Channels | Each with full 16C550 register set, separate 64-byte FIFOs, and autonomous trigger-level programming - enables concurrent serial protocols without resource contention. |
| Programmable Hardware Flow Control | Hysteresis-adjustable auto-RTS/CTS per channel using FCTR/TCR registers - eliminates FIFO overrun in asymmetric data-rate links like Ethernet-to-serial gateways. |
| RS-485 Half-Duplex Direction Control | Integrated HDX output (OPA#/OPB#) synchronized to TX start/stop - removes need for external direction logic and timing-critical discrete components. |
| IrDA 1.0/1.1 Encoder/Decoder | On-chip infrared modulation/demodulation with software-invertible idle polarity - meets SIR physical layer requirements without external transceivers. |
| Flexible Clock Architecture | Supports crystal (≤24 MHz) or external clock (≤80 MHz) with internal prescaler (÷1 or ÷4) - achieves ±0.1% baud accuracy over industrial temperature range. |
Applications
| Remote Access Servers | Ethernet-to-Serial Bridges |
|---|---|
|
Use Scenario: Aggregating console access from dozens of rack-mounted servers into a single IP-managed serial management port. IC Role / Device Role / Timing Role: Dual UART handles simultaneous SSH/console sessions; 64-byte FIFOs absorb burst traffic from multiple hosts without packet loss. Use Value: Eliminates external FIFO buffers and reduces host CPU polling frequency by >80%, lowering system power and latency. |
Use Scenario: Converting TCP/IP packets to RS-232/422/485 streams for legacy industrial PLCs in smart grid substations. IC Role / Device Role / Timing Role: Acts as protocol-transparent serial bridge; RS-485 HDX control ensures deterministic bus turnaround timing under 2 µs. Use Value: Enables seamless integration of Modbus RTU devices into IIoT networks without modifying field wiring or adding external direction logic. |
| Factory Automation Controllers | Point-of-Sale Terminal Hubs |
|
Use Scenario: Centralized motion controller communicating with servo drives (RS-485), barcode scanners (RS-232), and HMIs (IrDA) simultaneously. IC Role / Device Role / Timing Role: Dual UART channels isolate protocol timing domains; IrDA encoder handles short-range peripheral pairing without RF interference. Use Value: Single-chip solution replaces three discrete UARTs and an IrDA PHY, cutting BOM cost by 37% and PCB area by 42%. |
Use Scenario: Multi-interface payment terminal supporting magnetic stripe reader (RS-232), PIN pad (RS-485), and receipt printer (parallel-to-serial). IC Role / Device Role / Timing Role: Manages concurrent low-latency transactions; auto Xon/Xoff flow control prevents buffer overflow during EMV chip card handshakes. Use Value: Guarantees sub-10 ms response time for PCI PTS-certified transactions by eliminating UART overrun-induced retries. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SC16IS752IPW | I²C/SPI interface only; no parallel bus support; 64-byte FIFOs; 5V-tolerant I/O; requires external clock. | Suitable for microcontroller-based designs with limited GPIO but no address/data bus; lacks Intel/Motorola mode flexibility. | Select when migrating from MCU-hosted serial expansion rather than legacy ISA/PCI industrial controllers. |
| MAX3109ETJ+ | 3.3V-only supply; SPI-only interface; 128-byte FIFOs; integrated ±15kV ESD protection; no IrDA or RS-485 HDX control. | Better suited for portable medical devices requiring high ESD immunity; cannot replace PI7C9X752FAE in RS-485 factory automation cards. | Choose for battery-powered edge nodes where ESD robustness outweighs protocol versatility and bus compatibility. |
Compared with SC16IS752IPW and MAX3109ETJ+, the PI7C9X752FAE uniquely supports parallel bus interfacing (Intel/Motorola), integrated RS-485 HDX control, and IrDA - making it irreplaceable in retrofit industrial backplanes and multi-protocol serial concentrators.
Availability
PI7C9X752FAE is available at Aetrix Electronics and suitable for remote access servers, Ethernet-to-serial bridges, and factory automation controllers requiring stable component supply across extended product lifecycles.
Supply support for PI7C9X752FAE 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 integrated circuits, specializing in high-reliability solutions for industrial, computing, and communications markets.
The PI7C9X752FAE belongs to Diodes' high-performance UART product line, designed specifically for legacy interface consolidation in industrial automation, network infrastructure, and point-of-sale systems requiring dual-channel, 5V-tolerant, bus-compatible serial connectivity.
FAQ
What bus interface modes does the PI7C9X752FAE support?
The PI7C9X752FAE supports both Intel (16-bit) and Motorola (68k-style) parallel bus interfaces, selected by the logic level on the 16/68# pin. In Intel mode, it uses IOR# and IOW# strobes with CSA#/CSB# chip selects; in Motorola mode, it uses R/W# and IRQ# with unified CS#. Pin functions like A3 and CSB# remap accordingly.
How does the auto RS-485 half-duplex control work on this device?
RS-485 HDX control is implemented via OPA# and OPB# outputs, which are automatically asserted during TX activity and de-asserted within 2 µs after TX completion. The function is enabled per channel by setting DLD[6] and requires no external timing components - ensuring deterministic bus turnaround critical for Modbus RTU timing compliance.
Can the PI7C9X752FAE operate with a 24 MHz crystal?
Yes - the PI7C9X752FAE accepts crystals up to 24 MHz on XTAL1, with XTAL2 providing buffered output. When used with the internal prescaler (÷1 or ÷4), this supports standard baud rates from 300 bps to 16 Mbps with <±0.1% error across –40°C to +85°C, verified per DS40312 Rev 3-2 timing tables.
Does the device support automatic hardware flow control on both UART channels?
Yes - each UART channel independently supports auto RTS/CTS flow control via EFR[7:6] bits. RTS# de-assertion occurs when the RX FIFO reaches the programmed halt level (with hysteresis), and CTS# monitoring suspends TX immediately after the current character's stop bit - preventing FIFO overrun even under asymmetric data rates.
PI7C9X752FAE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- 48-TQFP
- Programmable:
- Not Verified
- Protocol:
- RS485
- Function:
- Controller
- Interface:
- UART
- Standards:
- IRDA 1.1
- Voltage - Supply:
- 1.62V ~ 3.6V
- Current - Supply:
- 10mA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 48-TQFP (7x7)
- Grade:
- -
- Qualification:
- -
PI7C9X752FAE FAQ
1.How can I place an order for PI7C9X752FAE through Aetrix?
Please submit a Request for Quotation (RFQ) for PI7C9X752FAE 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 PI7C9X752FAE reliable?
The price and inventory of PI7C9X752FAE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI7C9X752FAE is usually 5 days.
3.What payment methods are accepted for PI7C9X752FAE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI7C9X752FAE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI7C9X752FAE?
PI7C9X752FAE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI7C9X752FAE 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 PI7C9X752FAE?
For technical support, including PI7C9X752FAE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI7C9X752FAE requirements.
6.How does Aetrix verify that PI7C9X752FAE is sourced from the original manufacturer or authorized distributors?
All PI7C9X752FAE 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 PI7C9X752FAE meets industry standards.
7.What is the process for return or replacement of PI7C9X752FAE?
All PI7C9X752FAE units undergo pre-shipment inspection (PSI). If there is an issue with PI7C9X752FAE, 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 PI7C9X752FAE part is unused and in its original packaging.
Return procedure for PI7C9X752FAE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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