XIO2221ZAY - PCIe to 1394b OHCI Bridge | Texas Instruments
MPN: XIO2221ZAY ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.95 | $8.95 |
| 10 | $8.1 | $81.00 |
| 100 | $7.25 | $725.00 |
| 500 | $6.5 | $3,250.00 |
| 1,000 | $5.9 | $5,900.00 |
XIO2221ZAY Overview
A PCIe-to-PCI bridge is a digital interface IC that translates PCIe transactions to the legacy PCI bus protocol, allowing modern systems to interface with older expansion cards. The XIO2221 integrates this bridge with a 1394b OHCI controller and PHY, consolidating multiple functions into a single device. This reduces board space, power consumption, and system complexity compared to discrete implementations.
Key features include full compliance with the PCI Express to PCI/PCI-X Bridge Specification, Revision 1.0, and support for the standard PCI-to-PCI bridge programming model. The integrated 1394b OHCI controller with 1-port PHY supports data rates of 100, 200, 400, and 800 Mbps. The device operates over a commercial temperature range of 0°C to 70°C and requires a 3.3V core supply.
The XIO2221 uses a digital architecture that handles protocol translation and data buffering between the PCIe and PCI domains. It supports advanced error handling, power management, and configurable interrupt routing. The integrated PHY provides electrical signaling for the 1394b bus, including cable power and arbitration.
Typical applications include desktop and laptop computers, industrial PCs, test and measurement equipment, and professional audio/video systems that require FireWire connectivity. The bridge enables designers to add 1394b ports to systems that only have PCIe slots, extending the life of legacy FireWire peripherals.
When designing with the XIO2221, ensure proper decoupling of the 3.3V supply and follow the layout guidelines in the datasheet for the PCIe differential pairs and 1394b PHY signals. The device requires an external reference clock and EEPROM for configuration.
Drop-in alternatives for XIO2221ZAY — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
XIO2213BZAY
✅ Drop-In📋 Reference alternative (not in catalog)
XIO2213AZAY
✅ Drop-In📋 Reference alternative (not in catalog)
XIO2000AGZZ
⚡ Same Package📋 Reference alternative (not in catalog)
XIO2221ZAY
✅ Drop-In✓ In Stock
$5.9 / Unit
View Datasheet →XIO2213BIZAY
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
XIO2221ZAY Specifications
| Function | PCIe to PCI Translation Bridge with 1394b OHCI and 1-Port PHY |
| PCIe Interface | PCI Express to PCI/PCI-X Bridge Specification Rev 1.0 |
| 1394b Data Rates | 100, 200, 400, 800 Mbps |
| Number of 1394b Ports | 1 |
| Package | 167-NFBGA (ZAY) 12x12 mm |
| Operating Temperature | 0°C to 70°C |
| Supply Voltage | 3.3V core |
| PCI Bus Interface | PCI-to-PCI bridge programming model |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Number of Pins | 167 |
| ECAD Model | Available |
XIO2221ZAY Pin Configuration
| Pin A1 | VCC — Core power supply |
| Pin A2 | GND — Ground |
| Pin B1 | PCIe_TX+ — PCIe transmit differential pair |
| Pin B2 | PCIe_TX- — PCIe transmit differential pair |
| Pin C1 | PCIe_RX+ — PCIe receive differential pair |
| Pin C2 | PCIe_RX- — PCIe receive differential pair |
| Pin D1 | PCI_CLK — PCI clock output |
| Pin D2 | PCI_RST# — PCI reset |
| Pin E1 | 1394_TPA+ — 1394b PHY port A |
| Pin E2 | 1394_TPA- — 1394b PHY port A |
| Pin F1 | 1394_TPB+ — 1394b PHY port B |
| Pin F2 | 1394_TPB- — 1394b PHY port B |
Typical Applications
XIO2221ZAY is suitable for 6 applications: Desktop and Laptop Computers, Industrial PCs and Embedded Systems, Test and Measurement Equipment, Professional Audio/Video Systems, Medical Imaging and Diagnostics, Consumer Electronics and Peripherals.
Desktop and Laptop Computers
The XIO2221ZAY adds FireWire 800 connectivity to PCIe-based computers, enabling high-speed data transfer for external storage, video cameras, and audio interfaces. Its PCIe to PCI bridge allows legacy PCI cards to be used in modern systems, extending product life. The integrated PHY reduces BOM cost and board space, making it ideal for compact designs.
Recommended
Industrial PCs and Embedded Systems
In industrial PCs, the XIO2221ZAY provides reliable FireWire connectivity for machine vision cameras and data acquisition modules. Its compliance with PCIe to PCI bridge specification ensures interoperability with various PCI cards. The 0°C to 70°C operating range suits most industrial environments, and the 167-NFBGA package is suitable for space-constrained embedded boards.
Recommended
Test and Measurement Equipment
The XIO2221ZAY enables high-speed FireWire communication in oscilloscopes, logic analyzers, and data acquisition systems. Its 800 Mbps data rate supports fast waveform transfer and remote control. The integrated OHCI controller simplifies software development, and the PCIe bridge allows integration into modern PC-based instruments.
Recommended
Professional Audio/Video Systems
The XIO2221ZAY provides FireWire connectivity for professional audio interfaces, video capture cards, and mixing consoles. Its 800 Mbps bandwidth supports multiple channels of high-resolution audio and video streams. The low-latency OHCI controller ensures real-time performance, making it suitable for studio and broadcast applications.
Recommended
Medical Imaging and Diagnostics
In medical imaging systems, the XIO2221ZAY enables high-speed data transfer from FireWire-based cameras and sensors to processing units. Its reliable PCIe bridge ensures stable operation in critical applications. The device's compliance with industry standards and wide availability make it a trusted choice for medical equipment manufacturers.
Recommended
Consumer Electronics and Peripherals
The XIO2221ZAY is used in consumer devices like external hard drives, DVD players, and gaming consoles to provide FireWire connectivity. Its compact package and low power consumption make it suitable for portable devices. The integrated PHY reduces external component count, lowering manufacturing costs.
Recommended
Recommended Products Summary
Engineering reference data for XIO2221ZAY — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | XIO2213BZAY | XIO2213AZAY | XIO2000AGZZ |
|---|---|---|---|---|
| Package | 167-NFBGA (ZAY) | 167-NFBGA (ZAY) | 167-NFBGA (ZAY) | 167-NFBGA (GZZ) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| 1394b Ports | 1 | 3 | 3 | 0 |
| 1394b PHY | Integrated 1-port | Integrated 3-port | Integrated 3-port | None |
| PCIe Compliance | PCIe to PCI/PCI-X Bridge Spec Rev 1.0 | Same | Same | Same |
| Supply Voltage | 3.3V | 3.3V | 3.3V | 3.3V |
| Pin Compatibility | Reference | Pin-compatible | Pin-compatible | Different package |
Key Differentiators
- Integrated 1-port 1394b PHY (vs XIO2000AGZZ)
- Pin-compatible with 3-port variants (vs XIO2213BZAY)
- Lower cost for single-port applications (vs XIO2213AZAY)
Design Notes
The XIO2221ZAY requires a 3.3V core supply. Use a low-noise LDO or switching regulator with adequate decoupling. Place 0.1uF and 10uF capacitors close to each power pin. Ensure the power supply can handle the peak current during PCIe and 1394b operation.
Follow the layout guidelines in the datasheet for PCIe differential pairs and 1394b PHY signals. Maintain 100-ohm differential impedance for PCIe and 110-ohm for 1394b. Keep traces short and avoid vias where possible. Provide a solid ground plane under the device.
The 167-NFBGA package has limited thermal dissipation. Ensure adequate airflow or a thermal pad connected to a copper pour. The operating temperature range is 0°C to 70°C, so verify junction temperature under worst-case load. Use thermal vias if necessary.
Compliance Information
RoHS compliant per distributor listings. AEC-Q100 not applicable for this commercial-grade device.
