Renesas X9420YS16-2.7

Overview

X9420YS16-2.7 from Intersil is a single-channel, SPI-interface digitally controlled potentiometer (XDCP™) with 2.5 kΩ end-to-end resistance, 64-tap resolution, and dual-supply analog operation (V+ = +2.7V to +5.5V, V– = –2.7V to –5.5V), designed for precision voltage divider and variable resistor functions in low-noise signal conditioning circuits.

For engineers reviewing the X9420YS16-2.7 datasheet, X9420YS16-2.7 pinout, X9420YS16-2.7 application, or X9420YS16-2.7 equivalent, this page delivers verified electrical specs, SOIC-16 package mapping, SPI interface timing constraints, nonvolatile register behavior, and confirmed drop-in alternatives for industrial sensor biasing, op-amp gain trimming, and programmable reference adjustment.

Technical Context

The X9420YS16-2.7 implements a 63-segment resistor array with CMOS wiper switches controlled by a volatile 6-bit Wiper Counter Register (WCR), enabling precise digital positioning of the VW/RW terminal between VH/RH and VL/RL. Its SPI interface supports direct read/write of WCR and four 6-bit nonvolatile Data Registers (DR0–DR3), with power-up auto-load from DR0.

It operates with independent analog supplies (V+, V–) and digital supply (VCC = 2.7V to 5.5V), allowing true bipolar signal handling. The device features hardware write protection (WP pin), HOLD for serial pause, and A0 address selection for multi-device SPI buses - all validated under commercial temperature range (0°C to +70°C).

Key Specifications

Pinout & Package

Package: 16-lead SOIC (300 mil), RoHS-compliant Pb-free plus anneal option available (M16.3 drawing).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digitally controlled potentiometer applications.

Compared with ISL22416 and ISL95311, the X9420YS16-2.7 uniquely supports true bipolar analog operation (V+/V–), SPI register addressing, and hardware write protection - making it the only option for precision, field-reprogrammable, rail-to-rail potentiometer functions in industrial and audio signal chains.

Availability

X9420YS16-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, audio signal conditioning, programmable reference generation, and op-amp gain trimming requiring stable component supply and long-term calibration retention.

Supply support for X9420YS16-2.7 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

Intersil (now part of Renesas Electronics) is a semiconductor manufacturer specializing in precision analog, power management, and interface ICs for industrial, aerospace, and communications markets.

The X9420 product line was designed for digitally programmable analog signal conditioning - delivering solid-state reliability, nonvolatile setting retention, and SPI-configurable potentiometer functionality in space-constrained systems.

FAQ

What is the absolute maximum analog supply voltage range for X9420YS16-2.7?

The X9420YS16-2.7 supports V+ up to +5.5V and V– down to –5.5V, with (V+) – (V–) ≤ 12V. Absolute maximum ratings specify V+ ≤ +10V and V– ≥ –10V, but operational use must stay within ±5.5V to ensure specified linearity, noise, and reliability. Exceeding ±5.5V risks parametric degradation and reduced endurance.

Does X9420YS16-2.7 require external pull-up resistors on its SPI lines?

No, X9420YS16-2.7 does not require external pull-ups on SI, SO, or SCK. Its SO pin is push-pull, SI and SCK have CMOS-compatible input thresholds (VIH = 0.7×VCC, VIL = 0.1×VCC), and internal weak pull-downs are absent. Pull-ups should only be added if bus contention or noise immunity demands exceed system-level requirements.

How long does it take for X9420YS16-2.7 to become ready after power-up?

After VCC, V+, and V– reach stable values, X9420YS16-2.7 requires tPUR = 1 ms before issuing a read command and tPUW = 5 ms before initiating a write. Power-up sequencing must follow VCC → V+/V– → RH/VL/VW order; violating this delays valid wiper recall and may cause undefined SO states during early SPI access.

Can X9420YS16-2.7 be used as a two-terminal variable resistor?

Yes, X9420YS16-2.7 can operate as a two-terminal variable resistor by connecting either VH/RH or VL/RL to VW/RW and using the remaining terminal with the wiper. This configuration maintains full 64-tap resolution and nonvolatile storage, but reduces effective resistance range to 0–2.5 kΩ and requires careful attention to current limits (±3 mA wiper rating) and thermal derating.

What happens to the wiper position of X9420YS16-2.7 during a power cycle?

Upon power-up, X9420YS16-2.7 automatically loads the contents of Data Register 0 (DR0) into the volatile Wiper Counter Register (WCR), restoring the last stored wiper position. If DR0 was never written, the default value is 0x00, placing the wiper at VL/RL. This behavior is guaranteed only when VCC, V+, and V– all meet their minimum ramp rates and sequencing requirements.