My Inquiry
My Account
Diodes Incorporated PI7C9X794FCE
- Part No.:
- PI7C9X794FCE
- Manufacturer:
- Diodes Incorporated
- Category:
- Controllers
- Package:
- 64-LQFP
- Datasheet:
-
PI7C9X794FCE.pdf
- Description:
- IC BRIDGE QUAD UART 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,656
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
PI7C9X794FCE from Diodes Incorporated is a 1.62V–3.6V quad UART IC with 5V-tolerant serial inputs, four independent 16C550-compatible UART channels, 64-byte TX/RX FIFOs per channel, global interrupt output (INT#), and integrated IrDA 1.0/1.1 encoder/decoder - deployed in multi-port RS-232/422/485 communication cards for factory automation systems.
For engineers reviewing the PI7C9X794FCE datasheet, PI7C9X794FCE pinout, PI7C9X794FCE application, or PI7C9X794FCE equivalent, key selection criteria include 5V-tolerant modem I/O support, programmable FIFO trigger levels (1–60 bytes), Intel/Motorola bus interface select (16/68#), RS-485 half-duplex auto-direction control, and sleep-mode wake-up indication.
Technical Context
The PI7C9X794FCE implements four independent UART channels sharing a single 64-pin LQFP package and global control registers, each with fully programmable 16C550-compatible register sets, baud rate generators with prescaler (÷1 or ÷4), and dual-mode flow control (hardware RTS/CTS/DTR/DSR + software Xon/Xoff).
It supports dual bus protocols via 16/68# pin selection, integrates a 16-bit timer/counter with external clock input (TMRCK), includes crystal oscillator support (up to 24 MHz) or external clock (up to 80 MHz), and enables infrared mode via ENIR pin sampled at reset - all operating within a 1.62V–3.6V supply range while maintaining 5V tolerance on modem I/O pins (except XTAL1).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.62V to 3.6V - enables low-power operation in battery-backed or mixed-voltage industrial systems. |
| Serial Input Tolerance | 5V tolerant on all modem I/O (TX/RX/RTS/CTS/DTR/DSR/CD/RI) - eliminates level-shifter requirement for legacy RS-232 interfaces. |
| Max Data Rate | 8 Mbps with 64 MHz clock - supports high-throughput serial bridging in Ethernet-to-serial gateways. |
| FIFO Depth | 64-byte TX and RX FIFO per UART - reduces host CPU interrupt load in bursty traffic scenarios like POS terminal polling. |
| Interrupt Architecture | Single open-drain INT# output with Global Interrupt Source Register - simplifies interrupt handling across all 4 UARTs and timer events. |
| IrDA Support | IrDA 1.0/1.1 encoder/decoder with polarity-selectable RXD - enables direct infrared peripheral integration without external PHY. |
| Bus Interface | Selectable Intel (IOR#/IOW#/CS#) or Motorola (R/W#, CS# as R/W strobe) - ensures compatibility with legacy x86 and embedded MCU platforms. |
Pinout & Package
Package: 64-pin LQFP (10 mm × 10 mm, 0.5 mm pitch), RoHS-compliant, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| XTAL1 / XTAL2 | Clock input/output | Accepts 1–24 MHz crystal or external clock; XTAL1 not 5V tolerant - requires clean, low-jitter source for stable baud generation. |
| A[7:0], D[7:0] | Address/data bus | A0–A3 select UART register offset; A4–A6 select UART channel 0–3; A7 selects global registers - enables compact memory-mapped access. |
| IOR#, IOW#, CS#, 16/68# | Bus control | Configurable Intel/Motorola interface - allows drop-in replacement in legacy 8051, Z80, or x86-based designs without logic redesign. |
| INT# | Global interrupt | Open-drain, active-low output requiring 47k–100kΩ pull-up - supports wired-OR interrupt sharing with other peripherals. |
| TX0–TX3 / RX0–RX3 | UART data I/O | Four independent full-duplex serial channels - each supports RS-232, RS-422, RS-485 (HDX), or IrDA physical layer via configuration. |
| RTS0#–RTS3#, CTS0#–CTS3#, DTR0#–DTR3#, DSR0#–DSR3#, CD0#–CD3#, RI0#–RI3# | Modem control I/O | Per-channel hardware flow control and status signaling - enables automatic RS-485 direction management and carrier detection in telecom applications. |
| ENIR | Infrared enable | Sampled at power-up/reset to configure all UARTs for IrDA mode - eliminates runtime register writes for infrared-only deployments. |
| TMRCK | Timer clock input | External clock source for 16-bit timer/counter - supports precise timing for protocol timeouts or event capture independent of UART clocks. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous UART initialization | Resets all four UART channels and global registers in one command - ensures deterministic startup state across multi-port systems. |
| Programmable FIFO trigger levels | Configurable RX/TX interrupt thresholds (1–60 bytes) via FCTR/FCR registers - balances latency vs. CPU overhead for real-time serial buffering. |
| RS-485 half-duplex auto-control | Hardware-driven RTS#/DTR# assertion based on TX FIFO status - eliminates software-driven direction toggling and prevents bus contention. |
| Sleep mode with wake-up indicator | Reduces current draw during idle; wake-up flag in global register alerts host before full register restore - extends battery life in portable diagnostics tools. |
| Auto Xon/Xoff with hysteresis | Transmits Xoff when RX FIFO crosses trigger level; resumes on Xon only after FIFO drops below hysteresis threshold - prevents oscillation in noisy serial links. |
Applications
| Remote Access Servers | Ethernet-to-Serial Gateways |
|---|---|
Use Scenario: Rack-mounted terminal servers aggregating serial console access from dozens of network devices via TCP/IP. IC Role / Device Role / Timing Role: Quad UART bridges Ethernet MAC to four independent RS-232 serial ports, managing concurrent SSH/telnet sessions with hardware flow control. Use Value: 64-byte FIFOs per channel absorb bursty console output; 5V-tolerant inputs interface directly with legacy server management ports without level shifters. | Use Scenario: Industrial edge gateway converting Modbus RTU over RS-485 to MQTT over Wi-Fi/Ethernet. IC Role / Device Role / Timing Role: UART-2 and UART-3 handle dual RS-485 Modbus slaves; UART-0 manages local debug port; UART-1 drives IrDA diagnostics link. Use Value: RS-485 HDX auto-control eliminates external direction GPIO and timing-critical software toggling; global INT# simplifies interrupt servicing. |
| Factory Automation Controllers | Point-of-Sale Terminal Hubs |
Use Scenario: PLC backplane module providing serial connectivity to barcode scanners, weigh scales, and label printers. IC Role / Device Role / Timing Role: Each UART channel dedicated to one peripheral type; auto-RTS/CTS prevents buffer overrun during high-speed label printing bursts. Use Value: Programmable FIFO trigger levels (e.g., 24-byte RX threshold) align with scanner packet size; sleep mode reduces standby power in unattended lines. | Use Scenario: Compact POS hub connecting receipt printer, cash drawer, magnetic stripe reader, and customer display via isolated RS-232. IC Role / Device Role / Timing Role: UART-0 handles printer ESC/POS commands; UART-1 controls cash drawer solenoid; UART-2 reads MSR track data; UART-3 drives display backlight sync. Use Value: Single INT# line minimizes host GPIO usage; 5V-tolerant I/O withstands voltage spikes from inductive cash drawer loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| XR16V794IL48-F | Same die, 48-pin QFN package; lacks XTAL2 output buffer and ENIR pin; no IrDA support. | Targeted at space-constrained, non-infrared designs where crystal drive is handled externally. | Select when board layout demands smaller footprint and infrared is unused - verify external crystal driver capability. |
| SC16IS752IPW | I²C/SPI interface instead of parallel bus; 64-byte FIFOs; no 5V-tolerant modem I/O; requires level shifters for RS-232. | Used in modern ARM Cortex-M designs with limited GPIO but abundant serial peripheral interfaces. | Choose for microcontroller-based systems lacking parallel bus but needing flexible I²C/SPI expansion - accept added BOM cost for level shifters. |
Compared with XR16V794IL48-F, PI7C9X794FCE provides IrDA and buffered clock output essential for infrared diagnostics and self-contained oscillator designs; versus SC16IS752IPW, it delivers native 5V-tolerant I/O and parallel bus compatibility critical for legacy industrial controller retrofits.
Availability
PI7C9X794FCE is available at Aetrix Electronics and suitable for remote access servers, Ethernet-to-serial gateways, and factory automation controllers requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.
Supply support for PI7C9X794FCE 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 semiconductor company specializing in discrete, analog, and mixed-signal ICs for industrial, computing, and communications markets.
The PI7C9X794FCE belongs to Diodes' high-integration communication interface product line, designed specifically for multi-port serial bridging in bandwidth-constrained embedded systems where pin efficiency, power efficiency, and legacy interface compatibility are critical.
FAQ
What bus interface modes does the PI7C9X794FCE support?
The PI7C9X794FCE supports both Intel-style (IOR#, IOW#, CS#) and Motorola-style (R/W#, CS# as combined read/write strobe) parallel bus interfaces, selected by the 16/68# pin. This dual-mode capability allows seamless integration into legacy x86, Z80, or 68K-based systems without external glue logic or bus translators.
How does the PI7C9X794FCE handle RS-485 half-duplex direction control?
The PI7C9X794FCE provides hardware-driven RS-485 half-duplex direction control via RTS# or DTR# outputs, activated by setting MCR bit-2 and EFR bit-5. The device automatically asserts the control signal before transmission and de-asserts it after the last stop bit, eliminating software timing dependencies and preventing bus collisions in multi-drop networks.
Can the PI7C9X794FCE operate with a 5V system bus?
No - the PI7C9X794FCE's core logic operates strictly at 1.62V–3.6V (VCC), and its parallel bus pins (A[7:0], D[7:0], IOR#, IOW#, CS#) are not 5V tolerant. However, all modem I/O pins (TX/RX/RTS/CTS/DTR/DSR/CD/RI) are 5V tolerant, enabling direct connection to standard RS-232 transceivers powered from 5V rails.
What is the function of the ENIR pin?
The ENIR pin is a hardwired infrared mode enable input sampled at power-up, hardware reset (RST#), or software reset. When asserted high, it configures all four UART channels for IrDA 1.0/1.1 operation, including inverted polarity handling and encoder/decoder activation - eliminating the need for post-reset register writes in infrared-centric applications.
PI7C9X794FCE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- 64-LQFP
- Programmable:
- Not Verified
- Protocol:
- RS485
- Function:
- Controller
- Interface:
- UART
- Standards:
- IRDA 1.1
- Voltage - Supply:
- 1.62V ~ 3.6V
- Current - Supply:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 64-LQFP (10x10)
- Grade:
- -
- Qualification:
- -
PI7C9X794FCE FAQ
1.How can I place an order for PI7C9X794FCE through Aetrix?
Please submit a Request for Quotation (RFQ) for PI7C9X794FCE 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 PI7C9X794FCE reliable?
The price and inventory of PI7C9X794FCE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI7C9X794FCE is usually 5 days.
3.What payment methods are accepted for PI7C9X794FCE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI7C9X794FCE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI7C9X794FCE?
PI7C9X794FCE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI7C9X794FCE 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 PI7C9X794FCE?
For technical support, including PI7C9X794FCE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI7C9X794FCE requirements.
6.How does Aetrix verify that PI7C9X794FCE is sourced from the original manufacturer or authorized distributors?
All PI7C9X794FCE 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 PI7C9X794FCE meets industry standards.
7.What is the process for return or replacement of PI7C9X794FCE?
All PI7C9X794FCE units undergo pre-shipment inspection (PSI). If there is an issue with PI7C9X794FCE, 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 PI7C9X794FCE part is unused and in its original packaging.
Return procedure for PI7C9X794FCE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PI7C9X794FCE Tags
-
PTN5150AHXMP
NXP USA Inc.
-
USB3740B-AI9-TR
Microchip Technology
-
USB3740B-AI2-TR
Microchip Technology
-
USB3300-EZK-TR
Microchip Technology
-
USB3300-EZK
Microchip Technology
-
FUSB340TMX
onsemi
-
FUSB302BMPX
onsemi
-
DP83826IRHBR
Texas Instruments
-
MCP2518FDT-E/QBB
Microchip Technology
-
FUSB302MPX
onsemi
-
MCP2518FDT-E/SL
Microchip Technology
-
FT260Q-R
FTDI, Future Technology Devices International Ltd
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
