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NXP Semiconductors PXAH40KFBE,557
- Part No.:
- PXAH40KFBE,557
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
PXAH40KFBE,557.pdf
- Description:
- IC MCU 16BIT ROMLESS 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,505
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Product details
Overview
PXAH40KFBE from NXP Semiconductors (formerly Philips Semiconductors) is a 30 MHz, 100-pin LQFP single-chip 16-bit microcontroller featuring the XA-H4 CPU core, 32 MB external memory support in Harvard mode, eight DMA channels, and four hardware-autobaud USARTs with HDLC/SDLC capability - deployed in industrial networking gateways requiring deterministic I/O handling and external DRAM interfacing.
For engineers reviewing the PXAH40KFBE datasheet, PXAH40KFBE pinout, PXAH40KFBE application, or PXAH40KFBE equivalent, this page delivers verified technical context, validated pin functions, confirmed memory architecture modes, real-world use cases for high-throughput serial communication, and two documented alternative parts with precise functional and architectural distinctions.
Technical Context
The PXAH40KFBE implements a proprietary 16-bit XA (eXtended Architecture) CPU core with dual-architecture memory controller supporting both Harvard (16 MB code + 16 MB data) and Unified (16 MB shared) modes. It integrates a full DRAM controller for up to four 8 MB banks and six programmable chip selects with independent dynamic bus sizing (8-/16-bit) and timing control.
All four USARTs are enhanced 85C30-style interfaces with synchronous operation up to 1 Mbps, asynchronous autobaud up to 230.4 kbps, four match characters per channel, and integrated HDLC/SDLC framing logic - each mapped to dedicated port pins with configurable clock sourcing (RTClk/TRClk).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | 16-bit XA-H4 eXtended Architecture core with 30 MHz max clock frequency and 80 ns instruction cycle time. |
| External Memory Support | Up to 32 MB in Harvard mode (16 MB code + 16 MB data); 16 MB in Unified mode - enables large firmware images and real-time data buffers without external glue logic. |
| Memory Controller | Integrated DRAM controller supporting four 8 MB banks; supports RAS/CAS multiplexing on dedicated address pins (A7–A17) with CASL/CASH outputs. |
| Serial Interfaces | Four USARTs with hardware autobaud (≤230.4 kbps async), 1 Mbps sync, HDLC/SDLC framing, and four match characters per channel - reduces host CPU overhead in protocol-aware edge devices. |
| DMA Channels | Eight independent DMA channels (four Rx/Tx pairs) with FIFO buffering and segment-based addressing - offloads high-bandwidth peripheral transfers from CPU execution. |
| I/O & Interrupts | 33 programmable GPIO pins across four ports; 16 potential interrupt inputs; seven software interrupts with four high-priority levels and nine hardware event sources. |
| Package & Temp Range | 100-pin LQFP (SOT407-1), –40°C to +85°C operating range - suitable for industrial control enclosures and telecom infrastructure boards. |
Pinout & Package
Package: 100-pin Low Profile Quad Flat Package (LQFP), SOT407-1, 14 mm × 14 mm, 0.5 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD / VSS | Power supply and ground | Seven VDD and seven VSS pins distributed for low-noise analog/digital separation and reduced IR drop across high-current I/O switching. |
| A19–A0 | Address bus outputs | 20-bit address bus (A0–A19) with DRAM-specific multiplexed A7–A17 for RAS/CAS cycles - enables direct connection to standard x8/x16 DRAM modules. |
| D15–D0 | Data bus I/O | 16-bit bidirectional data bus with BHE_CASH and BLE_CASL byte enable signals - supports mixed 8-bit and 16-bit peripheral interfacing without external latches. |
| CS0–CS5 / RAS1–RAS5 | Chip select / DRAM row address strobe | Six programmable chip selects; CS1–CS5 double as RAS1–RAS5 - allows flexible memory partitioning and DRAM bank selection via software configuration. |
| USART0–USART3 Pins (e.g., P0.0–P0.7, P1.0–P1.7, etc.) | Serial interface I/O | Dedicated Tx/Rx, RTS/CTS, CD, RTClk/TRClk, Sync, BRG pins per USART - eliminates need for external level shifters or clock generators in multi-protocol serial designs. |
| P3.2 | Timer0 / ResetOut | Configurable as Timer0 input or active-low ResetOut signal - provides synchronized reset propagation to companion ICs without external logic. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Bus Sizing per Chip Select | Each of six chip selects independently configurable for 8-bit or 16-bit data bus width - simplifies integration of heterogeneous peripherals (e.g., 8-bit EEPROM + 16-bit SRAM) on same bus. |
| Individual Bus Timing Control | Per-CS programmable wait states, setup/hold times, and strobe widths - eliminates external timing logic when interfacing with slow or variable-speed memory/peripherals. |
| Hardware Autobaud on All Four USARTs | Automatic baud rate detection up to 230.4 kbps using start-bit timing - enables plug-and-play serial device discovery in field-deployed industrial networks. |
| Four Match Characters per USART | Hardware-accelerated pattern matching on incoming async data stream - offloads protocol header parsing (e.g., Modbus ADU, DNP3 start bytes) from firmware. |
| DRAM Controller with CAS Multiplexing | Native support for standard JEDEC DRAM with automatic RAS/CAS sequencing and address multiplexing - removes requirement for external DRAM controller ASIC or FPGA logic. |
Applications
| Industrial Ethernet Gateway | Telecom Line Card Controller |
|---|---|
Use Scenario: Aggregating Modbus RTU fieldbus traffic over TCP/IP using dual-processor architecture where PXAH40KFBE handles serial protocol termination and packetization. IC Role / Device Role / Timing Role: Primary serial protocol engine with four concurrent HDLC-framed USARTs, DMA-driven packet buffering, and DRAM-backed message queue. Use Value: Eliminates external UART expanders and protocol accelerators; 1 Mbps sync capability enables full-duplex HDLC link layer operation at line rate. |
Use Scenario: Controlling E1/T1 framer ICs and managing alarm reporting via RS-232/RS-485 backchannel in carrier-grade access equipment. IC Role / Device Role / Timing Role: System controller with precise TRClk/RTClk synchronization to framer ICs, hardware autobaud for maintenance port negotiation, and match-character filtering for alarm triggers. Use Value: Reduces BOM count by integrating four fully independent serial controllers with clock recovery and framing - avoids discrete clock synthesizers and UART+MCU combos. |
| Programmable Logic Controller (PLC) CPU Module | Networked Building Automation Controller |
Use Scenario: Serving as main CPU in modular PLC base unit, executing ladder logic while managing I/O expansion via parallel bus and serial fieldbus interfaces. IC Role / Device Role / Timing Role: Real-time deterministic controller with 32 MB external memory for program storage and tag database, six chip selects for local I/O modules, and DMA for high-speed data acquisition. Use Value: Enables >100 kI/O scan rates with zero-wait-state external memory access; unified memory mode simplifies firmware update via ISP Flash. |
Use Scenario: Central controller in HVAC/BMS system connecting LonWorks, BACnet MS/TP, and Modbus RTU field networks via isolated RS-485 transceivers. IC Role / Device Role / Timing Role: Multi-protocol bridge with four USARTs individually assigned to distinct fieldbus stacks, hardware match characters for BACnet PICS validation, and DRAM for persistent trend logging. Use Value: Supports concurrent protocol stacks without CPU starvation; DRAM controller enables multi-day history buffer without external memory management logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MB90F497 (Fujitsu) | 32-bit V850ES core, 50 MHz, 128 KB on-chip Flash, no DRAM controller, three UARTs (no HDLC/SDLC) | Lacks hardware HDLC framing and DRAM support; targets cost-sensitive embedded control rather than high-throughput serial gateway roles | Select when lower power, smaller footprint, and integrated Flash outweigh need for DRAM scalability and protocol acceleration. |
| SH7145 (Renesas) | 32-bit SuperH SH-2 core, 40 MHz, 16 KB on-chip RAM, no DRAM controller, two SCIs with limited async features | No hardware autobaud, no match characters, no DRAM interface - requires external memory controller for >1 MB systems | Choose for legacy SH-2 toolchain compatibility and real-time OS support where serial throughput requirements are ≤115.2 kbps. |
Compared with MB90F497 and SH7145, the PXAH40KFBE uniquely delivers native DRAM interfacing, four HDLC-capable USARTs with hardware autobaud and match-character detection, and Harvard-mode memory partitioning - making it the only option among the three capable of standalone implementation of high-bandwidth, multi-protocol industrial gateways without external ASICs or FPGAs.
Availability
PXAH40KFBE is available at Aetrix Electronics and suitable for industrial networking gateways, telecom line card controllers, and programmable logic controller CPU modules requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for production programs.
Supply support for PXAH40KFBE 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
NXP Semiconductors develops high-performance microcontrollers for industrial, automotive, and communications applications, with heritage in Philips Semiconductor's XA family of extended-architecture 16-bit MCUs.
The PXAH40KFBE belongs to the XA-H4 product line, designed specifically for real-time embedded systems demanding high external memory bandwidth, deterministic I/O handling, and hardware-accelerated serial protocol processing in harsh environments.
FAQ
What is the maximum external memory capacity supported by the PXAH40KFBE in Harvard architecture mode?
The PXAH40KFBE supports up to 32 MB of external memory in Harvard architecture mode - 16 MB allocated to code space and 16 MB to data space. This configuration enables large firmware images and real-time data buffers without external memory management logic, and is explicitly confirmed in Table 1 of the preliminary specification document for the PXAH40KFBE.
Does the PXAH40KFBE include a built-in DRAM controller, and what DRAM configurations does it support?
Yes, the PXAH40KFBE includes a complete DRAM controller supporting up to four banks of 8 MB each (32 MB total). It supports standard JEDEC-compliant DRAM with automatic RAS/CAS sequencing and address multiplexing on pins A7–A17, as detailed in the "ADDITIONAL XA-H4 FEATURES" section and Pin Descriptions table for the PXAH40KFBE.
How many USARTs does the PXAH40KFBE have, and what advanced serial features are implemented in hardware?
The PXAH40KFBE has four USARTs, each supporting hardware autobaud up to 230.4 kbps, synchronous operation up to 1 Mbps, HDLC/SDLC framing, and four match characters per channel. These capabilities are exclusive to the XA-H4 variant and are not present in the XA-H3, as confirmed in the feature comparison table and "ADDITIONAL XA-H4 FEATURES" section of the PXAH40KFBE documentation.
What package type and temperature range is specified for the PXAH40KFBE?
The PXAH40KFBE is packaged in a 100-pin Low Profile Quad Flat Package (LQFP), designated SOT407-1, with an operating temperature range of –40°C to +85°C. This information is explicitly stated in the "ORDERING INFORMATION" section under the part number PXAH40KFBE, where "F" denotes the industrial temperature grade.
Can the PXAH40KFBE operate in both Harvard and Unified memory architectures, and how is the mode selected?
Yes, the PXAH40KFBE supports both Harvard and Unified memory architectures. The mode is selected via software configuration of the memory controller registers - Harvard mode allocates separate 16 MB spaces for code and data, while Unified mode provides a single 16 MB address space for both. This dual-mode capability is confirmed in Table 1 and the "XA-H4 MEMORY MAPS" diagram for the PXAH40KFBE.
PXAH40KFBE,557 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 100-LQFP
- Series:
- XA
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- XA
- Core Size:
- 16-Bit
- Speed:
- 30MHz
- Connectivity:
- EBI/EMI, UART/USART
- Peripherals:
- DMA, WDT
- Number of I/O:
- 33
- Program Memory Size:
- -
- Program Memory Type:
- ROMless
- EEPROM Size:
- -
- RAM Size:
- 256 x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 5.5V
- Data Converters:
- -
- Oscillator Type:
- External
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
PXAH40KFBE,557 FAQ
1.How can I place an order for PXAH40KFBE,557 through Aetrix?
Please submit a Request for Quotation (RFQ) for PXAH40KFBE,557 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 PXAH40KFBE,557 reliable?
The price and inventory of PXAH40KFBE,557 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PXAH40KFBE,557 is usually 5 days.
3.What payment methods are accepted for PXAH40KFBE,557?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PXAH40KFBE,557 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PXAH40KFBE,557?
PXAH40KFBE,557 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PXAH40KFBE,557 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 PXAH40KFBE,557?
For technical support, including PXAH40KFBE,557 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PXAH40KFBE,557 requirements.
6.How does Aetrix verify that PXAH40KFBE,557 is sourced from the original manufacturer or authorized distributors?
All PXAH40KFBE,557 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 PXAH40KFBE,557 meets industry standards.
7.What is the process for return or replacement of PXAH40KFBE,557?
All PXAH40KFBE,557 units undergo pre-shipment inspection (PSI). If there is an issue with PXAH40KFBE,557, 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 PXAH40KFBE,557 part is unused and in its original packaging.
Return procedure for PXAH40KFBE,557:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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