Diodes Incorporated TRAC-S2Q16

Overview

TRAC-S2Q16 from Zetex plc is a TRAC® Support Circuit designed to automate power-up programming of Totally Reconfigurable Analog Circuit (TRAC) devices. It integrates rail-splitting (AGND_OUT adjustable from 2.0V–2.5V), supply monitoring (4.35V–4.75V reset threshold), on-chip programmable oscillator (7–15 kHz CLK_OUT), DATA_OUT (1.7–4.0 kHz), and thermal shutdown. Used with serial EEPROMs like ST9346CB1 in analog signal processing prototyping systems.

For engineers reviewing the TRAC-S2Q16 datasheet, TRAC-S2Q16 pinout, TRAC-S2Q16 application, or TRAC-S2Q16 equivalent, this device serves as a dedicated support IC for TRAC-family analog FPGA-like reconfiguration - requiring precise AGND generation, synchronized reset, and cascaded memory-driven loading logic.

Technical Context

The TRAC-S2Q16 implements a structured analog system boot architecture: its rail-splitter uses an external SETV divider to define AGND_OUT (±20 mA drive), enabling biasing of multiple TRAC devices; the supply monitor employs a precision ZSM560-based circuit to assert RESET_OUT during VDD ramp-up or dropout, ensuring deterministic initialization across the TRAC chain.

Its programming logic generates CLK_OUT and NOT CLK_OUT (inverted) at user-set frequency via external capacitor, divides CLK_OUT by four to produce DATA_OUT, and asserts SELECT to enable serial EEPROM - all gated by CLCR_IN feedback from the final TRAC device to halt clocking automatically upon load completion.

Key Specifications

Pinout & Package

TRAC-S2Q16 is housed in a 16-pin QSOP package (4.80 mm × 3.81 mm body, 0.635 mm pitch), optimized for high-density analog PCB layouts with low thermal resistance and minimal parasitic coupling.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar TRAC support circuit applications.

Compared with ZXTR2005Q16 and MAX16052ATT+T, TRAC-S2Q16 uniquely integrates rail-splitting, programmable clocking, and memory interface logic - eliminating ≥7 external components required by alternatives to achieve identical TRAC boot functionality.

Availability

TRAC-S2Q16 is available at Aetrix Electronics and suitable for automated analog prototyping, reconfigurable sensor signal conditioning, and industrial PLC I/O module calibration requiring stable component supply and long-term obsolescence management.

Supply support for TRAC-S2Q16 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

Zetex plc (now part of Diodes Incorporated) was a UK-based analog semiconductor specialist focused on high-performance discrete and interface ICs for industrial and automotive markets.

TRAC-S2 belongs to Zetex's TRAC® Support Circuit product line, engineered specifically to accelerate analog system development by automating configuration loading, bias generation, and fault-safe initialization of field-programmable analog arrays.

FAQ

What capacitor value sets the default CLK_OUT frequency?

A 2.2 nF capacitor between CAP and VSS yields a nominal CLK_OUT frequency of 10 kHz at 25°C, per the datasheet's electrical characteristics table. Frequency varies linearly with capacitance - halving the cap doubles frequency, and vice versa. The capacitor must be ceramic with tight tolerance (±10%) for repeatable timing across units.

Can TRAC-S2Q16 support more than one TRAC device in cascade?

Yes - TRAC-S2Q16 is explicitly designed for cascaded TRAC configurations. Its CLCR_IN input monitors the final TRAC's load-complete signal, and its rail-splitter delivers ±20 mA to power up to four TRAC devices plus associated circuitry. The datasheet confirms automatic clock termination regardless of cascade depth.

Is AGND_OUT capable of sourcing and sinking current simultaneously?

No - AGND_OUT operates as a single-ended analog ground reference that can source or sink up to 20 mA, but not both at once. Its output stage is a Class-A buffer with low output impedance (<1 Ω), allowing it to maintain voltage stability under unidirectional load transients typical in TRAC bias networks.

Does TRAC-S2Q16 require external pull-up resistors on open-drain pins?

Only RESET_OUT is open-drain; it requires an external pull-up resistor (typically 10 kΩ to VDD) to generate a valid logic-high reset signal. All other outputs (CLK_OUT, NOT CLK_OUT, DATA_OUT, SELECT) are push-pull and do not require external terminations. The datasheet specifies RESET_OUT sink current capability of 0.14 mA at 4 V.