NXP Semiconductors PCA9507DP,118

Overview

PCA9507DP,118 from NXP Semiconductors is a dual-supply 2-wire serial bus extender enabling bidirectional 3.3 V ↔ 5 V level translation with rise time acceleration on port A and static level offset on port B. It supports HDMI DDC, I²C-bus, and SMBus applications up to 400 kHz, drives 1400 pF on port A (18 m cable), and features powered-off high-impedance I/Os and active-HIGH enable control.

For engineers reviewing the PCA9507DP,118 datasheet, PCA9507DP,118 pinout, PCA9507DP,118 application, or PCA9507DP,118 equivalent, key selection criteria include port-specific voltage translation behavior, rise time accelerator activation threshold (0.3V_CC(A)), lock-up free arbitration support across ports, and compatibility with HDMI DDC v1.3 distance requirements.

Technical Context

The PCA9507DP,118 implements asymmetric buffering: port A integrates a dynamic rise time accelerator that activates above 0.3V_CC(A) and deactivates near 0.7V_CC(A), delivering 6 mA transient pull-up current and <80 ns LOW-to-HIGH transition time; port B uses static level offset drivers with 0.5 V typical VOL at 6 mA and no rise time acceleration.

Directional control is determined by voltage thresholds: port B falling below 0.4 V enables port A's pull-down to ~0 V; port A falling below 0.3V_CC(A) triggers port B's pull-down to ~0.5 V. EN pin requires idle-bus state transitions and has internal ~100 kΩ pull-up to V_CC(B).

Key Specifications

Pinout & Package

TSSOP8 package (SOT505-1): plastic thin shrink small outline, 8 leads, 3 mm body width, 0.65 mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus extension applications.

Compared with PCA9517DP,118 and PCA9515DP,118, the PCA9507DP,118 uniquely combines port A rise time acceleration with port B static offset to meet HDMI DDC v1.3 distance and voltage threshold requirements - neither alternative supports 18 m extension while maintaining sink-side 0.5 V LOW compatibility.

Availability

PCA9507DP,118 is available at Aetrix Electronics and suitable for HDMI DDC interface design, industrial SMBus expansion, and mixed-voltage I²C-bus domain bridging requiring stable component supply and long-cable signal integrity.

Supply support for PCA9507DP,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 company specializing in secure connectivity solutions for automotive, industrial, and consumer applications.

The PCA9507DP,118 belongs to NXP's I²C-bus and SMBus repeater product line, engineered specifically to solve HDMI DDC signal integrity challenges in digital video systems requiring long-cable EDID communication.

FAQ

What is the maximum cable length supported by the PCA9507DP,118?

The PCA9507DP,118 supports up to 18 meters of cable length on port A when driving a 1400 pF capacitive load, meeting HDMI DDC version 1.3 distance specifications. This performance relies on the integrated rise time accelerator on port A and appropriate pull-up resistor selection (1.5 kΩ–2.0 kΩ for source, 47 kΩ for sink SCLA). Port B is rated for 400 pF, limiting its extension capability.

How does the PCA9507DP,118 prevent bus lock-up during I²C arbitration?

The PCA9507DP,118 prevents lock-up via threshold-based directional control: port B falling below 0.4 V enables port A's pull-down to ~0 V, while port A falling below 0.3V_CC(A) triggers port B's pull-down to ~0.5 V. This asymmetry ensures unambiguous direction detection during multi-master arbitration and clock stretching, avoiding the false LOW recognition that causes hang conditions in standard buffers.

Can the PCA9507DP,118 be used with different supply voltages on port A and port B?

Yes, the PCA9507DP,118 supports independent supply rails: V_CC(A) and V_CC(B) each operate from 2.7 V to 5.5 V, enabling true 3.3 V ↔ 5 V level translation. The device powers up safely regardless of supply sequence, and all I/Os remain 5.5 V tolerant even when either supply is at 0 V - critical for hot-swap HDMI DDC operation.

What is the role of the EN pin on the PCA9507DP,118 and how should it be controlled?

The EN pin is an active-HIGH enable input with internal ~100 kΩ pull-up to V_CC(B). It must only be toggled when both global I²C-bus and local ports are idle to prevent bus hang. Typical use cases include isolating the DDC line during HDMI source power-up reset or disabling communication with misbehaving slaves - improper timing risks corrupting ongoing transactions.

Why can't port B of the PCA9507DP,118 connect to another device with a rise time accelerator?

Port B of the PCA9507DP,118 uses static level offset drivers producing a ~0.5 V LOW, which conflicts with the input threshold (~0.3V_CC) of accelerators like PCA9515 or PCA9517. Connecting them creates ambiguous voltage states where the accelerator interprets 0.5 V as indeterminate, risking metastability or lock-up. The datasheet explicitly prohibits such connections to ensure deterministic bus behavior.