NXP Semiconductors PCA9504ADGG,118

Overview

PCA9504ADGG,118 from NXP Semiconductors (formerly Philips Semiconductors) is a highly integrated motherboard "glue chip" ASIC designed for Intel 8xx-series chipset platforms. It provides dual strapping-selectable logic modes, 5 V/3.3 V voltage translation for DDC and VGA sync signals, IDE/PCI reset buffering, power sequencing (BACKFEED_CUT, PWRGD_3V), and HD/LED drive - enabling compact, cost-optimized PC motherboard designs.

For engineers reviewing the PCA9504ADGG,118 datasheet, PCA9504ADGG,118 pinout, PCA9504ADGG,118 application, or PCA9504ADGG,118 equivalent, this device serves as a critical platform integration component for legacy Intel desktop/server motherboards requiring precise timing coordination, multi-rail power management, and analog/digital signal conditioning between I/O controller hub (ICH2) and peripherals.

Technical Context

The PCA9504ADGG,118 implements configurable logic paths via STRAP pin selection (FLUSH or GP mode), with dedicated circuitry for flush-init sequence generation, hysteresis-based RSMRST# delay (32 ms nominal), and dual-voltage DDC I²C level-shifting up to 400 kHz. Its internal VCCP_VREF bias generator adapts input thresholds dynamically per mode (0.95–1.1 V in FLUSH; 1.95–2.1 V in GP).

It integrates discrete functions including open-drain PS_ON control, latched BACKFEED_CUT logic synchronized to SLP_S5#, 24 mA LED drivers (GRN_LED/YLW_LED), and buffered audio enable/reset/mute paths - all operating across independent 3.3 V standby and 5.0 V system rails within 0 °C to +70 °C ambient range.

Key Specifications

Pinout & Package

Package: 56-pin TSSOP (SOT364-1), 0.5 mm pitch, body size 14.0 × 6.1 mm - optimized for high-density motherboard placement near ICH2.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar motherboard glue logic applications.

Compared with PCA9505ADGG,118 and PI7C9X20404BQEX, the PCA9504ADGG,118 delivers targeted legacy-platform integration with minimal footprint and zero firmware dependency - making it the most cost-effective solution for Intel 8xx chipset motherboard production.

Availability

PCA9504ADGG,118 is available at Aetrix Electronics and suitable for desktop motherboard manufacturing, Intel chipset platform integration, and legacy PC repair requiring stable component supply and long-term lifecycle support.

Supply support for PCA9504ADGG,118 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 is a global semiconductor leader delivering high-performance mixed-signal solutions for automotive, industrial, and computing markets.

The PCA9504ADGG,118 belongs to NXP's legacy PC platform integration product line, specifically engineered to consolidate discrete logic on Intel 8xx-series chipset motherboards - reducing bill-of-materials cost and improving design reliability.

FAQ

What is the primary function of the PCA9504ADGG,118 in Intel-based motherboards?

The PCA9504ADGG,118 serves as a dedicated glue chip that consolidates motherboard logic functions for Intel 8xx-series chipsets. It performs critical tasks including IDE/PCI reset buffering, DDC I²C level-shifting, VGA sync signal translation, power sequencing (BACKFEED_CUT, PWRGD_3V), and front-panel LED/audio control - all within a single 56-pin TSSOP package. This integration eliminates multiple discrete components required in earlier designs.

Does the PCA9504ADGG,118 support both 33 MHz and 66 MHz clock inputs?

Yes, the PCA9504ADGG,118 supports both 33 MHz and 66 MHz CLK_IN frequencies. The SEL_33_66 pin (pin 10) determines the clock rate: logic LOW selects 66 MHz operation, and logic HIGH selects 33 MHz. All internal timing parameters - including FLUSH_OUT_CPU and INIT_OUT propagation delays - remain valid across both clock rates as confirmed in the AC Characteristics table.

How does the STRAP pin (pin 54) affect the behavior of the PCA9504ADGG,118?

The STRAP pin configures the PCA9504ADGG,118 into one of two operational modes: FLUSH mode (default, internally pulled up) or GP mode (pulled to GND). In FLUSH mode, pins 4–8 implement cache flush and CPU initialization sequencing logic. In GP mode, those same pins become general-purpose logic gates (GP1/GP2 inputs/outputs). The VCCP_VREF bias voltage also shifts accordingly (0.95–1.1 V in FLUSH; 1.95–2.1 V in GP) to match input threshold requirements.

Can the PCA9504ADGG,118 drive standard front-panel LEDs directly?

Yes, the PCA9504ADGG,118 can directly drive standard front-panel LEDs. Its GRN_LED (pin 40) and YLW_LED (pin 39) outputs each support 24 mA sink current, sufficient for common 5 mm LEDs without external current-limiting resistors or transistor drivers. This capability is explicitly specified in the DC Characteristics table under HD_LED and LED driver parameters.

What are the key power supply requirements for the PCA9504ADGG,118?

The PCA9504ADGG,118 requires two independent supply rails: a 3.3 V standby rail (V_3P3_STBY, pin 3) and a 5.0 V system rail (V_5P0_STBY, pin 2). Both must be present simultaneously for proper operation. Recommended operating conditions specify V_3P3_STBY = 3.0–3.6 V and V_5P0_STBY = 4.75–5.25 V. The device draws current from both supplies to power its dual-voltage I/O structures and internal reference generators.