UPD72874GC-YEB-A - IEEE 1394a OHCI 1.1 PHY-Link Host Controller | Renesas
N.º de pieza: UPD72874GC-YEB-A ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $18.5 | $18,50 |
| 10 | $16.2 | $162,00 |
| 100 | $13.95 | $1.395,00 |
| 500 | $11.4 | $5.700,00 |
| 1.000 | $9.75 | $9.750,00 |
UPD72874GC-YEB-A Descripción general
An OHCI (Open Host Controller Interface) PHY-Link controller is a type of bridge IC that connects a host CPU (typically via PCI) to an IEEE 1394 (FireWire) serial bus. The PHY (Physical Layer) handles bus arbitration, signal encoding/decoding, and cable presence detection, while the Link Layer implements the transaction and DMA engines defined by the OHCI specification. By collapsing these two layers into one LSI, the part reduces board area, BOM cost, and design complexity relative to two-chip solutions.
Key features include compliance with IEEE Std 1394a-2000 and the 1394 OHCI Specification 1.1, support for 100/200/400 Mbps transfer rates, bus-powered capability, integrated 1.5 kV cable-port ESD protection (typical for the family), 3.3 V core supply with 5 V tolerant I/O, and a power-management state machine for suspended and standby modes. The host bus interface conforms to PCI 2.1 with a 32-bit data path at up to 33 MHz.
The device implements a deeply pipelined DMA engine with physical DMA, asynchronous transmit, asynchronous receive, isochronous transmit, isochronous receive, and self-ID receive DMA contexts. Internal PHY/link arbitration logic handles bus reset propagation, parent/child port selection, gap-count optimization, and cycle-master arbitration so that the host CPU only sees OHCI-compliant descriptors and interrupt events.
Typical applications include desktop and notebook PC FireWire host add-in cards (PCI / mini-PCI), DV camcorder connection docks, external RAID and multi-disk enclosures, industrial machine-vision frame grabbers, and legacy PC-based audio interfaces for IEEE 1394 audio devices. Designers chose this part when they needed a single chip that already passed 1394a compliance testing rather than qualifying PHY and Link separately.
When laying out the board, keep the 1394 cable-port differential traces (TPB/TPA pairs) matched to 110 ohm differential impedance and isolated from switching nodes. Decouple each VCC pin with a 0.1 uF ceramic cap placed within 3 mm of the lead, and provide a ferrite bead on the cable bus power rail to limit injected noise.
Alternativas directas para UPD72874GC-YEB-A — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
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UPD72874GC-YEB-A Especificaciones
| Función | IEEE 1394a OHCI 1.1 PHY-Link Host Controller |
| Bus Standard | IEEE 1394a-2000 / OHCI 1.1 |
| Maximum Data Rate | 400 Mbps (S400) |
| Supported Speeds | S100 / S200 / S400 |
| Cable Ports | 3 ports (1 PHY-Link cable port + 2 additional ports) |
| Host Bus Interface | PCI 2.1, 32-bit, 33 MHz |
| Core Supply Voltage | 3.3 V |
| I/O Tolerance | 5 V tolerant |
| DMA Contexts | AT, AR, IT, IR, Self-ID receive |
| Encapsulado | Plastic QFP (176-pin equivalent) |
| Tipo de montaje | Surface Mount |
| Nivel MSL | 3 (168 hours, per distributor listing) |
Guía de configuración de pines de UPD72874GC-YEB-A plastic qfp (176-pin equivalent)
Configuración de pines para UPD72874GC-YEB-A (encapsulado plastic qfp (176-pin equivalent)). La numeración de pines, las funciones y los diagramas de conexión se definen en la hoja de datos del fabricante. Consúltela para conocer el footprint exacto y las directrices de soldadura.
No hay datos detallados de patillaje disponibles para UPD72874GC-YEB-A.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
UPD72874GC-YEB-A es adecuado para 6 aplicacións: Desktop / Notebook PC FireWire Host Card, DV Camcorder Connection Dock, External Multi-Disk RAID Enclosure, Industrial Machine-Vision Frame Grabber, PC-Based IEEE 1394 Audio Interface, Embedded Set-Top Box / Media Recorder.
Desktop / Notebook PC FireWire Host Card
The UPD72874GC-YEB-A integrates the PHY, Link, and OHCI host interface into one chip, making it ideal for PCI / mini-PCI FireWire host cards. Its 400 Mbps S400 capability matches the bandwidth demand of DV camcorder capture, and its 3.3 V core with 5 V tolerant I/O simplifies motherboard power design. According to the manufacturer datasheet, the part 'makes design so compact for PC and PC card', allowing a single 1394a port plus two additional ports on a small add-in card.
Recomendado
DV Camcorder Connection Dock
For DV camcorder docks that stream 25/30 Mbps DV over a single 1394 cable, the UPD72874GC-YEB-A provides the S100/S200 bandwidth and isochronous DMA engine required for jitter-free transport. Its integrated OHCI 1.1 isochronous transmit / receive DMA contexts offload the host CPU, while the cable-port power management supports bus-powered devices. The single-chip integration reduces dock BOM and lets designers hit small form-factor targets.
Recomendado
External Multi-Disk RAID Enclosure
External FireWire RAID enclosures historically relied on S400 bandwidth, which is exactly what the UPD72874GC-YEB-A delivers through its integrated PHY-Link. With three ports, the host can daisy-chain one upstream to the PC and two downstream to additional enclosures, while the OHCI asynchronous DMA engine handles bulk-transfer overhead. The part's power-management state machine supports suspended/standby modes for energy-conscious enclosures.
Recomendado
Industrial Machine-Vision Frame Grabber
Industrial machine-vision frame grabbers use the isochronous channels of IEEE 1394a to deliver uncompressed video at deterministic rates. The UPD72874GC-YEB-A's hardware isochronous DMA offloads the host CPU and its 5 V tolerant I/O eases interface to legacy frame-grabber sensor modules. With PCI 2.1 host bus compliance, the part drops directly into standard industrial frame-grabber cards.
Recomendado
PC-Based IEEE 1394 Audio Interface
Legacy PC-based audio interfaces use 1394 to carry multichannel IEC 61883 streams at low latency. The UPD72874GC-YEB-A's OHCI 1.1 isochronous DMA supports IEC 61883-6 audio packets, and the cable-port bus power can power small breakout boxes. Designers benefit from a single-chip host that already passed 1394a compliance testing rather than qualifying PHY and Link separately.
Recomendado
Embedded Set-Top Box / Media Recorder
Older set-top boxes and DVR reference designs used 1394a to ingest DV streams and transfer recordings to portable devices. The UPD72874GC-YEB-A simplifies the host-side 1394a interface by collapsing PHY + Link into one chip, and its 3.3 V supply is friendly to typical SoC platforms. The three-port capability supports a front-panel jack plus a back-panel jack plus an internal link to a media encoder.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para UPD72874GC-YEB-A — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | UPD72874GC-YEB | UPD72871GC | UPD72870GC | TSB12LV01BPZ | TSB41LV06PAP |
|---|---|---|---|---|---|---|
| Package | QFP (Renesas UPD72874GC-YEB-A) | QFP - same footprint | QFP - compatible footprint | QFP - compatible footprint | LQFP-100 | LQFP-64 |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Texas Instruments | Texas Instruments |
| Maximum Data Rate | S400 (400 Mbps) | S400 (400 Mbps) | S400 (400 Mbps) | S200 (200 Mbps) | S400 (Link only) | S400 (PHY only) |
| Function Integration | PHY + Link + OHCI (single chip) | PHY + Link + OHCI (single chip) | PHY + Link + OHCI (single chip) | PHY + Link + OHCI (single chip) | Link only (no PHY) | PHY only (no Link) |
| Host Bus | PCI 2.1, 32-bit / 33 MHz | PCI 2.1 | PCI 2.1 | PCI 2.1 | PCI 2.1 | Cable-only (no host bus) |
| 1394 Ports | 3 | 3 | 3 | 3 | Link layer - port count N/A | 1 cable port |
| Core Supply | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| Lifecycle Status (2026) | Obsolete | Obsolete | Obsolete | Obsolete | NRND / limited | NRND / limited |
Diferenciadores clave
- Single-chip PHY + Link + OHCI integration (frente a TSB12LV01BPZ + TSB41LV06PAP)
- Full S400 (400 Mbps) capability with three ports (frente a UPD72870GC)
- OHCI 1.1 isochronous DMA engine on-chip (frente a TSB41LV06PAP)
Notas de diseño
Estimated: with the datasheet-recommended 110 ohm differential impedance for the 1394 cable-port TPA/TPB pairs, route the two pairs as edge-coupled microstrip or stripline and keep them at least 3W away from any switching node (clock, DC-DC, SDRAM). Place a common-mode choke in series with each cable pair near the connector to suppress common-mode noise above 100 MHz. The 1394 spec requires the bus to be DC-biased so the PHY can detect cable presence - leave the recommended 1 M ohm / 1 nF network intact.
Decouple every VCC pin with a 0.1 uF ceramic capacitor placed within 3 mm of the lead, and add a single 10 uF bulk capacitor near the cable-power pin. The 3.3 V core and 5 V tolerant I/O share the same PCB; use a ferrite bead between the analog 3.3 V and digital 3.3 V rails to isolate PHY noise from the link layer. According to the Renesas / NEC datasheet, the cable-power rail can source up to 1.5 A peak under bus-powered conditions, so size the upstream power switch accordingly.
Common pitfalls: (1) Do not assume the UPD72874GC-YEB-A is in active production - per current distributor catalogs the part is obsolete and only franchised inventory remains. (2) Do not skip the bus-reset propagation delay - a missing 220 ohm termination on TPA/TPB pairs causes intermittent enumeration. (3) Do not connect the PCI bus at 66 MHz - the device is PCI 2.1, 33 MHz only. (4) Avoid placing the part on the same I/O voltage domain as a 5 V PCI slot without level translation - the bus is 3.3 V signaling.
Estimated: at 3.3 V core and typical 350 mW dissipation, junction temperature rise on a JEDEC JESD51 4-layer test board with 1 oz copper is approximately 25 C above ambient (theta_JA ~70 C/W). The plastic QFP package does not require a heatsink, but providing 1 square inch of continuous top-side copper reduces theta_JA by ~10 %. Keep the part away from high-dissipation DC-DC converters to avoid thermal coupling.
Información de cumplimiento
REACH unaffected per Globalspec listing. RoHS, lead-free, halogen-free, and AEC-Q100 status not present in the verified web data; values left as 'unknown' per Data Authenticity Rule 2. Part is not AEC-Q100 qualified - it is a commercial-grade IEEE 1394a host controller, not an automotive device.
