Renesas ISL59442IB

Overview

ISL59442IB from Intersil is a single-output 4:1 analog multiplexing amplifier with fixed unity gain, 1GHz small-signal bandwidth (V_OUT = 200mV_P-P), 235MHz large-signal bandwidth (V_OUT = 2V_P-P), and high-speed three-state output control (HIZ). It operates from ±5V supplies, supports TTL/CMOS logic inputs (S0, S1, HIZ), and is used in HDTV analog input switching paths.

For engineers reviewing the ISL59442IB datasheet, ISL59442IB pinout, ISL59442IB application, or ISL59442IB equivalent, key selection criteria include its 1GHz bandwidth at low output swing, 28–30ns channel switching time, <2mV_P-P switching glitch, differential gain/phase error of 0.01%/0.02°, and SOIC-14 package compatibility with video signal routing systems requiring minimal crosstalk and fast settling.

Technical Context

The ISL59442IB integrates four analog input channels (IN0–IN3) into a single high-speed output amplifier using binary-select logic (S0/S1) and active-high HIZ control. Its internal architecture features low-input-capacitance, high-input-resistance circuitry optimized for 50Ω/75Ω video termination and direct drive into 500Ω loads with ≤1.6pF total capacitance.

It employs ESD-protected, dV/dt-triggered clamp circuits on V+/V− pins, imposes a strict 1V/µs supply turn-on slew rate limit, and uses internal pull-down resistors on all logic inputs-enabling floating logic pins without external biasing while maintaining deterministic channel selection and output disable behavior.

Key Specifications

Pinout & Package

ISL59442IB is housed in a 14-lead SOIC (Small Outline Integrated Circuit) package per drawing MDP0027, with 1.27mm lead pitch, 8.65mm × 3.9mm body size, and RoHS-compliant matte tin terminations. The package includes three NIC (Not Internally Connected) pins placed adjacent to input pins to reduce crosstalk when tied to ground.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog multiplexing amplifier applications.

Compared with AD8174ARZ and MAX4392ESE+, the ISL59442IB uniquely delivers 1GHz bandwidth at ±5V with integrated HIZ and <0.02° phase error-making it irreplaceable in high-fidelity broadcast and HDTV analog switching where speed, fidelity, and bus-sharing are co-dependent requirements.

Availability

ISL59442IB is available at Aetrix Electronics and suitable for HDTV/DTV analog inputs, video projectors, computer monitors, and security video systems requiring stable component supply and long-term obsolescence management.

Supply support for ISL59442IB 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 (now part of Renesas Electronics) is a U.S.-based analog and mixed-signal semiconductor company specializing in high-performance power management, precision analog, and high-speed interface ICs.

The ISL59442IB belongs to Intersil's high-speed video signal routing product line, engineered specifically for broadcast-grade analog video multiplexing with emphasis on bandwidth, low distortion, and deterministic switching behavior in consumer and professional AV equipment.

FAQ

What is the maximum recommended load capacitance for optimal 1GHz performance of the ISL59442IB?

The ISL59442IB is optimized for ≤1.6pF total load capacitance (CL) at the output pin, comprising PCB trace capacitance (CT) and any discrete capacitor (COUT). Exceeding this value increases peaking and degrades stability. For best 1GHz small-signal response, keep CL between 1.0pF and 6.0pF using short traces and localized COUT placement. The ISL59442IB datasheet specifies 1.6pF as the test condition for its 1GHz bandwidth rating.

Does the ISL59442IB require external pull-up or pull-down resistors on S0, S1, or HIZ pins?

No, the ISL59442IB includes internal pull-down resistors on S0, S1, and HIZ pins, allowing them to be left floating while maintaining defined logic states. This eliminates the need for external biasing components. The ISL59442IB truth table confirms that unconnected logic inputs default to low, ensuring predictable channel selection (IN0) and active output mode unless explicitly driven high.

Can the ISL59442IB operate from a single +5V supply instead of ±5V?

No, the ISL59442IB requires dual ±5V supplies (V+ = +5V, V− = −5V) as specified in its absolute maximum ratings and electrical test conditions. Its internal amplifier architecture and ESD protection circuits depend on symmetric rails. Attempting single-supply operation will result in undefined output behavior, failure to meet AC specifications (e.g., 1GHz bandwidth), and potential damage due to violation of the ±5V supply voltage limit.

What is the purpose of the NIC pins on the ISL59442IB, and how should they be handled?

The NIC (Not Internally Connected) pins (2, 6, 9) on the ISL59442IB are isolated from the die and serve solely as crosstalk shields between adjacent analog inputs. Per the datasheet, they must be tied to ground to minimize inter-channel coupling and achieve >75dB isolation at 10MHz. Leaving them floating degrades channel-to-channel isolation and increases differential phase error-directly impacting video color accuracy in the ISL59442IB application.

How does the ISL59442IB handle power-up sequencing, and what precautions are needed?

Due to internal ESD diodes and a dV/dT-triggered clamp between V+ and V−, the ISL59442IB mandates a supply turn-on slew rate ≤1V/µs. Exceeding this risks damaging currents during hot-plug events. Additionally, analog/logic inputs must not be driven before V+ and V− are fully established. Schottky diodes (e.g., MBR0550T) from V+ and V− to ground are recommended to shunt fault currents, as detailed in Figure 25 of the ISL59442IB datasheet.