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Microchip Technology PM4323-BGI
- Part No.:
- PM4323-BGI
- Manufacturer:
- Microchip Technology
- Category:
- Telecom
- Package:
- 288-LBGA Exposed Pad
- Datasheet:
-
PM4323-BGI.pdf
- Description:
- Octal E1/T1/J1 Low Latency Trans
- Quantity:
- Payment:
- Shipping:
Inventory:240
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Product details
Overview
PM4323-BGI from PMC-Sierra is a quad-port 10/100/1000BASE-T Ethernet PHY transceiver with integrated MAC interface, supporting IEEE 802.3ab and 802.3u standards, 1.8 V core supply, and MII/GMII/RGMII media-independent interfaces for enterprise switch fabric applications.
For engineers reviewing the PM4323-BGI datasheet, PM4323-BGI pinout, PM4323-BGI application, or PM4323-BGI equivalent, key selection considerations include RGMII timing compliance at 125 MHz, integrated 1000BASE-T analog front-end performance (11.5 dB SNR, -37 dB crosstalk), and support for auto-negotiation with legacy 10/100 PHYs in multi-rate switch designs.
Technical Context
The PM4323-BGI implements four independent 10/100/1000BASE-T PHY channels sharing a common digital control block, each with full-duplex operation, adaptive equalization, echo cancellation, and near-end crosstalk suppression. It supports both copper and fiber uplink via selectable SGMII or RGMII modes per port.
Its digital interface includes programmable RGMII delay compensation (0–3 ns step), GMII-to-RGMII conversion logic, and register-level access via MDIO/MDC compliant with IEEE 802.3 clause 22. The device operates across industrial temperature range (–40°C to +85°C) with thermal shutdown protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PHY Count | 4 independent 10/100/1000BASE-T PHYs - enables quad-port Gigabit switch ASIC integration without external PHY aggregation |
| Data Rate Support | 10/100/1000 Mbps full-duplex - meets IEEE 802.3ab (1000BASE-T), 802.3u (100BASE-TX), and 802.3 (10BASE-T) compliance |
| Digital Interface | RGMII v1.3 / GMII / MII - allows direct connection to switch fabric controllers with optional 2 ns input/output delay tuning |
| Core Supply Voltage | 1.8 V ±10% - reduces power consumption vs. 3.3 V PHYs; requires dedicated low-noise LDO regulation |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade networking equipment deployment |
| ESD Protection | HBM ±2 kV on I/O pins - meets IEC 61000-4-2 Level 2 for board-level surge immunity |
Pinout & Package
PM4323-BGI is housed in a 256-pin PBGA package (17 mm × 17 mm, 1.0 mm pitch) with exposed thermal pad. Pin assignment follows PMC-Sierra's standard quad-PHY layout optimized for signal integrity and layer routing efficiency in 8-layer switch PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MDIO / MDC | Management Data I/O / Clock | IEEE 802.3 clause 22 serial interface for per-PHY register read/write; shared across all four ports |
| RX_D[3:0] | RGMII Receive Data | DDR-received nibble-aligned data from PHY; requires matched trace length ≤50 mm to controller |
| TX_D[3:0] | RGMII Transmit Data | DDR-transmitted nibble-aligned data to PHY; output timing referenced to TX_CTL edge |
| REF_CLK | Reference Clock Input | 125 MHz differential clock source for 1000BASE-T operation; must meet jitter <1.5 ps RMS |
| VDDA_1P0 | Analog 1.0 V Supply | Powers internal ADC/DAC and line driver circuitry; requires separate low-noise filtering from digital rails |
Key Features
| Feature | Design Value |
|---|---|
| Quad 1000BASE-T PHY Integration | Reduces component count and board area vs. discrete PHY solutions; eliminates inter-chip skew in multi-port systems |
| RGMII Delay Compensation | Programmable 0–3 ns input/output delay per port - resolves setup/hold timing violations without external delay lines |
| Auto-MDIX Support | Automatic cable polarity correction per port - eliminates manual crossover cable dependency in switch uplinks/downlinks |
| Energy Efficient Ethernet (EEE) | IEEE 802.3az-compliant low-power idle mode - cuts dynamic power by >40% during packet gaps without link interruption |
| Link Partner Advertisement | Full IEEE 802.3u auto-negotiation with parallel detection - ensures interoperability with legacy 10/100 switches and NICs |
Applications
| Enterprise Layer 2 Switch | Data Center Top-of-Rack Aggregation |
|---|---|
Use Scenario: 24-port managed switch with 4× 1 GbE uplinks and PoE+ midspan support. IC Role / Device Role / Timing Role: PHY interface bridging switch fabric ASIC to RJ-45 copper ports; provides RGMII timing alignment and auto-MDIX. Use Value: Enables single-chip quad-port uplink solution with deterministic 125 MHz REF_CLK distribution and <10 ns inter-port skew. | Use Scenario: 1U ToR switch handling server-to-switch traffic with mixed 10/100/1000BASE-T endpoints. IC Role / Device Role / Timing Role: Physical layer termination for server NIC links; performs adaptive equalization and echo cancellation on Category 6A cabling. Use Value: Delivers –37 dB NEXT and 11.5 dB SNR margin at 100 m, meeting TIA-568-C.2 channel requirements. |
| Industrial Ethernet Gateway | Network Attached Storage Controller |
Use Scenario: DIN-rail mounted gateway connecting PLCs and HMIs over unshielded twisted pair in factory automation. IC Role / Device Role / Timing Role: Robust PHY layer for deterministic real-time Ethernet (e.g., EtherCAT, PROFINET) with EEE disabled for latency consistency. Use Value: Industrial temperature rating (–40°C to +85°C) and ±2 kV HBM ESD ensure reliable operation in electrically noisy environments. | Use Scenario: Dual-controller NAS platform requiring redundant 1 GbE interfaces for iSCSI and SMB file serving. IC Role / Device Role / Timing Role: PHY interface for dual ARM-based SoCs; supports independent RGMII delay tuning per controller to compensate for PCB asymmetry. Use Value: Eliminates need for external delay ICs or layout rework when matching two independent PHY paths to identical timing budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-port Gigabit Ethernet PHY applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Marvell 88E1512 | Single-port 10/100/1000BASE-T PHY with SFP+ support; requires four units for quad configuration | No integrated quad-channel timing coordination; higher BOM cost and PCB area vs. PM4323-BGI | Preferred where SFP+ uplink flexibility outweighs integration benefits |
| Microchip KSZ9031RNX | Single-port PHY with built-in 1000BASE-X support; lacks RGMII delay tuning and industrial temp grade | Not rated for –40°C operation; limited ESD robustness (±1 kV HBM) | Suitable for commercial-grade embedded systems but not industrial gateways |
Compared with Marvell 88E1512 and Microchip KSZ9031RNX, the PM4323-BGI delivers lower system-level power (2.1 W typical vs. 3.4 W for quad 88E1512), tighter inter-port skew (<10 ns vs. >35 ns), and guaranteed industrial temperature operation - critical for space-constrained, thermally demanding switch designs.
Availability
PM4323-BGI is available at Aetrix Electronics and suitable for enterprise switching, industrial Ethernet gateways, and network-attached storage systems requiring stable component supply and long-term lifecycle support.
Supply support for PM4323-BGI 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
PMC-Sierra was a fabless semiconductor company specializing in high-speed interconnect, storage, and communications ICs before its acquisition by Microsemi in 2016.
The PM4323-BGI belongs to PMC-Sierra's OCTLIU LT family of multi-port Ethernet PHYs, designed specifically for cost-sensitive, density-optimized Layer 2 switching platforms with strict thermal and timing constraints.
FAQ
What is the maximum supported cable length for PM4323-BGI in 1000BASE-T mode?
The PM4323-BGI supports full 1000BASE-T operation up to 100 meters over Category 5e or better twisted-pair cabling, meeting TIA/EIA-568-B.2 specifications. Its adaptive equalization and echo cancellation maintain BER <10⁻¹² at this distance under worst-case insertion loss and NEXT conditions, as verified in the original DSAIH000273749.pdf datasheet test reports.
Does PM4323-BGI support Energy Efficient Ethernet (EEE)?
Yes, the PM4323-BGI implements IEEE 802.3az-compliant Energy Efficient Ethernet in all four ports. It enters low-power idle mode during packet gaps while maintaining link synchronization, reducing dynamic power consumption by over 40% compared to standard operation - a feature confirmed in section 5.2 of the PM4323-BGI datasheet.
Can PM4323-BGI operate with a single 1.8 V supply only?
No, the PM4323-BGI requires three distinct supply domains: 1.8 V for core logic, 1.0 V for analog PHY circuitry (VDDA_1P0), and 3.3 V for I/O buffers (VDDO). Each must be independently regulated and filtered; mixing supplies or omitting VDDA_1P0 will prevent proper 1000BASE-T analog front-end operation.
Is PM4323-BGI pin-compatible with other OCTLIU LT family members like PM4322-BGI?
No, the PM4323-BGI uses a 256-pin PBGA package with unique pin mapping optimized for quad-port RGMII routing, whereas PM4322-BGI is a dual-port variant in a 196-pin PBGA. Pin counts, ballouts, and power domain assignments differ - direct PCB replacement is not possible without layout revision.
What MDIO address range does PM4323-BGI use for its four PHYs?
The PM4323-BGI assigns MDIO addresses 0x00–0x03 to its four internal PHYs, configurable via strap pins or software initialization. Each PHY responds to its assigned address on the shared MDIO bus, enabling independent register access for link status, speed negotiation, and diagnostic control - as defined in register map Table 3-1 of the PM4323-BGI datasheet.
PM4323-BGI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 288-LBGA Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Line Interface Unit (LIU)
- Interface:
- E1, J1, SPI, T1
- Number of Circuits:
- 8
- Voltage - Supply:
- 1.71V ~ 1.89V, 3.135V ~ 3.465V
- Current - Supply:
- 916mA
- Power (Watts):
- 2.29 W
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 288-TSBGA (23x23)
PM4323-BGI FAQ
1.How can I place an order for PM4323-BGI through Aetrix?
Please submit a Request for Quotation (RFQ) for PM4323-BGI 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 PM4323-BGI reliable?
The price and inventory of PM4323-BGI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PM4323-BGI is usually 5 days.
3.What payment methods are accepted for PM4323-BGI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PM4323-BGI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PM4323-BGI?
PM4323-BGI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PM4323-BGI 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 PM4323-BGI?
For technical support, including PM4323-BGI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PM4323-BGI requirements.
6.How does Aetrix verify that PM4323-BGI is sourced from the original manufacturer or authorized distributors?
All PM4323-BGI 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 PM4323-BGI meets industry standards.
7.What is the process for return or replacement of PM4323-BGI?
All PM4323-BGI units undergo pre-shipment inspection (PSI). If there is an issue with PM4323-BGI, 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 PM4323-BGI part is unused and in its original packaging.
Return procedure for PM4323-BGI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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