NXP Semiconductors PCA9507D,118

Overview

The PCA9507D,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 up to 400 kHz, drives 1400 pF on port A (18 m cable), and features powered-off high-impedance I/Os for system isolation.

For engineers reviewing the PCA9507D,118 datasheet, PCA9507D,118 pinout, PCA9507D,118 application, or PCA9507D,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 repeater, and SO8 package compatibility with HDMI DDC 1.3 distance compliance.

Technical Context

The PCA9507D,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.

Direction 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 0.5 V pull-down. EN is active HIGH with internal 100 kΩ pull-up to V_CC(B), and drivers remain disabled until both V_CC(A) and V_CC(B) exceed 2.7 V.

Key Specifications

Pinout & Package

PCA9507D,118 is supplied in an 8-pin SO8 package (SOT96-1), 3.9 mm body width, with gull-wing leads and standard JEDEC MS-012 footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 2-wire bus extender applications.

Compared with PCA9507D,118, PCA9517DP,118 and PCA9515D,118 lack port A rise time acceleration and 1400 pF drive capability, making them unsuitable for HDMI DDC 1.3-compliant cable extension-PCA9507D,118 remains the only option among the three supporting 18 m reach and star-configurable port A.

Availability

PCA9507D,118 is available at Aetrix Electronics and suitable for HDMI DDC cable extension, industrial I²C level translation, and server SMBus backplane isolation requiring stable component supply and long-term lifecycle support.

Supply support for PCA9507D,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 PCA9507D,118 belongs to NXP's I²C-bus extender product line, designed specifically to solve HDMI DDC signal integrity challenges and enable robust multi-voltage, multi-segment I²C/SMBus networks in space-constrained systems.

FAQ

What is the maximum cable length supported by the PCA9507D,118?

The PCA9507D,118 supports up to 18 meters of cable on port A when driving a 1400 pF load, meeting HDMI DDC version 1.3 distance specifications. This performance relies on the integrated rise time accelerator on port A and proper pull-up resistor selection (e.g., 1.5–2.0 kΩ for 5 V port A). Port B supports up to 400 pF, limiting its reach to shorter interconnects.

How does the PCA9507D,118 prevent bus lock-up during level translation?

The PCA9507D,118 prevents lock-up via intentional 70 mV hysteresis between port B's input threshold (0.43 V) and its output LOW voltage (0.5 V). When port B is driven LOW, it settles at ~0.5 V-above the 0.43 V threshold-so the internal logic does not misinterpret it as a valid LOW, avoiding oscillation or deadlock. This design is validated across temperature and voltage ranges per the datasheet.

Can the PCA9507D,118 operate with different supply voltages on port A and port B?

Yes, the PCA9507D,118 supports independent supplies: V_CC(A) and V_CC(B) each range from 2.7 V to 5.5 V and may be powered in any sequence. This enables true 3.3 V ↔ 5 V translation-for example, V_CC(A) = 5 V (HDMI DDC side) and V_CC(B) = 3.3 V (microcontroller side)-without external level-shifting components.

Is the EN pin of the PCA9507D,118 internally pulled up, and what happens if left floating?

Yes, the EN pin of the PCA9507D,118 has an internal ~100 kΩ pull-up resistor to V_CC(B). If left floating, EN defaults HIGH and the buffer operates normally. However, for deterministic startup and noise immunity, NXP recommends tying EN to V_CC(B) through a 10 kΩ resistor or controlling it actively-especially during power-up sequencing to avoid partial-enable states.

Does the PCA9507D,118 support I²C clock stretching and multi-master arbitration?

Yes, the PCA9507D,118 fully supports I²C clock stretching and multi-master arbitration across the repeater. Its bidirectional buffering preserves SCL and SDA signal integrity, and its propagation delays (≤350 ns B→A) ensure timing margins remain within I²C Standard- and Fast-mode specifications. This is confirmed in functional testing per NXP's application notes and Figure 11/12 waveforms.