Renesas X9313ZMI-3T1

Overview

X9313ZMI-3T1 from Intersil is a digitally controlled potentiometer (XDCP™) with linear taper, 32-tap resolution, 3-wire serial interface, ±V_CC terminal voltage capability, and 1kΩ end-to-end resistance. It functions as a solid-state replacement for mechanical potentiometers in precision analog trimming circuits, supporting nonvolatile wiper position storage and recall at power-up. Designed for low-power embedded control systems operating from 3V to 5.5V.

For engineers reviewing the X9313ZMI-3T1 datasheet, X9313ZMI-3T1 pinout, X9313ZMI-3T1 application, or X9313ZMI-3T1 equivalent, key selection criteria include its 1kΩ RTOTAL tolerance (±20%), 3-wire up/down interface timing (tIW = 5µs), wiper resistance (40Ω typ. at VCC = 5V), and industrial temperature range (–40°C to +85°C).

Technical Context

The X9313ZMI-3T1 implements a resistor ladder of 31 matched elements with electronically switched wiper access to 32 discrete tap points. Its 5-bit up/down counter drives a decoder that selects one wiper position, with "make-before-break" switching ensuring continuity during transitions. The device uses CMOS logic for control inputs (CS, U/D, INC) and integrates nonvolatile EEPROM for wiper position retention over 100 years.

Operation requires CS low to enable, followed by edge-triggered INC pulses synchronized with U/D level to increment or decrement wiper position. A store operation occurs only when CS rises while INC is high, writing the current counter value to memory. Standby current is limited to 500µA max, and wiper terminal voltage range spans –V_CC to +V_CC, enabling bipolar signal handling.

Key Specifications

Pinout & Package

The X9313ZMI-3T1 is housed in an 8-lead MSOP package (JEDEC MO-187-AA compliant, pkg drawing M8.118), measuring 3.0mm × 3.0mm × 0.85mm with 0.65mm pitch gull-wing leads. This RoHS-compliant, Pb-free surface-mount package supports automated assembly and offers thermal performance suitable for dense PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5243BRMZ10 and MCP4017T-103E/MS, the X9313ZMI-3T1 uniquely combines 3-wire simplicity, nonvolatile storage, ±V_CC analog tolerance, and industrial temperature rating-making it optimal for robust, self-initializing analog trimming in space-constrained industrial designs.

Availability

X9313ZMI-3T1 is available at Aetrix Electronics and suitable for industrial power supplies, sensor signal conditioning, audio equipment calibration, and embedded control systems requiring stable component supply with guaranteed long-term availability.

Supply support for X9313ZMI-3T1 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 Corporation is a precision analog and power management IC specialist, now part of Renesas Electronics, delivering high-reliability solutions for industrial, infrastructure, and computing markets.

The X9313 family was designed specifically for solid-state replacement of mechanical potentiometers in analog trimming applications requiring nonvolatile setting retention, low power, and robust operation across extended temperature ranges.

FAQ

What is the maximum allowable voltage across RH/VH and RL/VL terminals for X9313ZMI-3T1?

The X9313ZMI-3T1 specifies ΔV = |VH − VL| ≤ 4V for the X9313Z variant. This limit applies regardless of V_CC level and is independent of the ±V_CC terminal voltage rating. Exceeding 4V risks irreversible damage to the internal resistor array and must be avoided in all operating conditions, including transient events.

Does X9313ZMI-3T1 support true bidirectional analog signal routing through the wiper?

Yes, X9313ZMI-3T1 supports bidirectional analog signal flow because its RH/VH and RL/VL terminals tolerate voltages from –V_CC to +V_CC, and the wiper (RW/VW) operates symmetrically across the full resistor array. This enables use in AC-coupled attenuators, balanced line drivers, and other circuits where signal polarity reverses relative to ground.

How does the X9313ZMI-3T1 handle power-up initialization, and what wiper position is active immediately after reset?

At power-up, X9313ZMI-3T1 recalls the last stored wiper position from nonvolatile memory within 10µs (t_PU). No default or mid-scale position is assumed. If no prior store has occurred, the wiper defaults to position 0 (connected to RL/VL). To ensure deterministic startup, users must perform at least one store operation during initial calibration or commissioning.

Can X9313ZMI-3T1 be used in a 2-terminal (rheostat) configuration, and what design considerations apply?

Yes, X9313ZMI-3T1 can operate as a 2-terminal variable resistor by connecting either RH/VH or RL/VL to RW/VW and using the remaining two terminals. In this mode, total resistance equals the sum of elements between wiper and the shorted terminal. Designers must observe the ±4.4mA max wiper current limit and derate power dissipation per the 16mW rating for 1kΩ devices.

What is the significance of "make-before-break" switching in X9313ZMI-3T1, and how does it affect circuit behavior?

"Make-before-break" means the new wiper tap connects before the previous one disconnects, preventing momentary open-circuit conditions. For X9313ZMI-3T1, this eliminates output glitches during position changes-critical in closed-loop feedback paths or audio signal chains. However, it causes temporary parallel conduction across adjacent taps, briefly reducing effective RTOTAL during multi-step moves.