Diodes Incorporated PI7C8148BNJE

Overview

PI7C8148BNJE from Pericom Semiconductor is an asynchronous 2-port PCI-to-PCI bridge IC compliant with PCI Local Bus Specification Revision 2.3. It enables transparent interconnection between two independent 32-bit, 33 MHz PCI buses, supports dynamic prefetching, delayed transaction buffering, and dual-bus arbitration with separate primary/secondary latency timers. Used in industrial backplane systems requiring legacy PCI expansion and bus isolation.

For engineers reviewing the PI7C8148BNJE datasheet, PI7C8148BNJE pinout, PI7C8148BNJE application, or PI7C8148BNJE equivalent, key selection criteria include asynchronous clock domain operation, support for Type 0/Type 1 configuration cycles, I/O and memory address decoding with prefetchable memory windows, and integrated EEPROM interface for configuration storage.

Technical Context

The PI7C8148BNJE implements full PCI-to-PCI bridging logic with independent primary and secondary bus interfaces, each supporting 32-bit data width and 33 MHz operation. It handles address translation, transaction ordering per PCI specification, and error reporting via SERR# and parity status registers.

Its asynchronous mode allows non-synchronized clocks on primary and secondary buses, with dedicated CLKIN and CLKOUT signals. The device includes configurable GPIOs, programmable bridge control registers (e.g., BRIDGE CONTROL at offset 3Ch), and support for CompactPCI hot-swap through dedicated signaling and reset sequencing.

Key Specifications

Pinout & Package

PI7C8148BNJE is housed in a 160-pin LFBGA package (12 mm × 12 mm, 0.8 mm pitch) with exposed thermal pad. Pin assignments are defined per signal type: primary bus interface (AD[31:0], C/BE#[3:0]#, PAR), secondary bus interface (S_AD[31:0], S_C/BE#[3:0]#, S_PAR), clocks (CLKIN, S_CLKOUT), resets (RST#, S_RST#), and general-purpose I/O (GPIO[7:0]).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCI-to-PCI bridging applications.

Compared with PI7C8148BNJE, the PCI9052 serves a fundamentally different interface function (PCI-to-local), while the 21152 lacks asynchronous operation-making PI7C8148BNJE uniquely suited for electrically isolated, independently clocked PCI bus expansion in ruggedized systems.

Availability

PI7C8148BNJE is available at Aetrix Electronics and suitable for industrial backplane expansion, CompactPCI hot-swap systems, legacy PCI slot aggregation, and VGA-compatible embedded graphics requiring stable component supply and long-term design continuity.

Supply support for PI7C8148BNJE 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

Pericom Semiconductor was a fabless provider specializing in high-speed interface, timing, and signal-integrity solutions for computing and communications infrastructure before its acquisition by Diodes Incorporated in 2017.

The PI7C8148BNJE belongs to Pericom's PCI bridge product line, designed specifically for robust, low-latency interconnection of legacy PCI subsystems in industrial and telecom equipment where protocol transparency and bus isolation are critical.

FAQ

Does PI7C8148BNJE support PCI-X or PCIe protocols?

No. PI7C8148BNJE is strictly compliant with PCI Local Bus Specification Revision 2.3 and operates only at 32-bit/33 MHz. It does not support PCI-X extensions (64-bit, 66/100/133 MHz) or PCIe serial architecture. Its design targets legacy PCI system upgrades-not next-generation interconnects.

Can PI7C8148BNJE operate with mismatched primary and secondary bus speeds?

No. Both primary and secondary buses are fixed at 33 MHz per the datasheet. While asynchronous clock domains are supported, the device does not implement frequency translation or rate adaptation-each bus must run at nominal 33 MHz, even if clocks are uncorrelated.

Is EEPROM configuration mandatory for PI7C8148BNJE operation?

No. EEPROM is optional. The device boots using default configuration values stored in hardwired registers. EEPROM auto-load occurs only if the AUTO MODE bit (bit 7 of DIAGNOSTIC/CHIP CONTROL register) is set; otherwise, configuration proceeds via host software writes to the configuration space.

What thermal management provisions exist for PI7C8148BNJE in LFBGA packaging?

The 160-pin LFBGA package includes an exposed thermal pad on the underside, intended for solder attachment to a PCB copper pour. Thermal resistance (θ_JA) is specified at 32°C/W under JEDEC JESD51-7 conditions, requiring minimum 4×4 cm² internal ground plane for reliable operation at 769 mW typical power dissipation.