Analog Devices Inc./Maxim Integrated MAX6961ATH+T

Overview

MAX6961ATH+T from Maxim Integrated is a 4-wire serially interfaced, cathode-row LED display driver for 8 × 8 matrix displays. It supports monocolor or RGY (red/green/yellow) configurations with two-step pixel-level intensity control, 256-step global panel brightness, and analog/digital digit-by-digit current calibration. Designed for indoor signage and industrial message boards, it delivers up to 40mA peak segment current per column while operating from a 2.7V–3.6V supply.

For engineers reviewing the MAX6961ATH+T datasheet, MAX6961ATH+T pinout, MAX6961ATH+T application, or MAX6961ATH+T equivalent, this device offers verified open/short LED detection, local 3-wire bus synchronization for multi-driver panels, slew-rate-limited drivers for EMI reduction, and automatic plane switching from 63Hz to one frame per 63 seconds - all critical for reliable, flicker-free animated LED signage design.

Technical Context

The MAX6961ATH+T implements a multiplexed constant-current architecture with eight sink outputs (ROW1–ROW8) and sixteen source outputs (COL1–COL16), enabling direct drive of two monocolor 8×8 digits or one RGY 8×8 digit. Its 20MHz 4-wire serial interface supports global command broadcast and indirect/direct memory addressing across up to 256 interconnected devices.

It features dual digit-specific current setting via RISET0/RISET1 pins (20mA or 40mA per digit), 256-step PWM panel intensity, and frame-modulated 2-bit-per-pixel intensity using 12-frame superframes. The local 3-wire ADDIN/ADDOUT/ADDCLK bus enables automatic address allocation and plane-change interrupt generation without host intervention.

Key Specifications

Pinout & Package

MAX6961ATH+T uses a 44-pin TQFN-EP package (7mm × 7mm, 0.5mm pitch) with exposed pad for thermal dissipation. Pin functions are electrically identical to the MQFP variant but optimized for compact PCB layouts and improved thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LED display driver applications.

Compared with MAX6960ATH+T and MAX6962ATH+T, the MAX6961ATH+T uniquely balances RGY support with two-step intensity control - making it the optimal choice for tricolor indoor signage where yellow synthesis and batch-matched red/green intensity are required, without over-specifying for RGB or under-specifying for monocolor-only use cases.

Availability

MAX6961ATH+T is available at Aetrix Electronics and suitable for industrial message boards, gaming machine displays, audio/video equipment UIs, and automated test equipment panels requiring stable component supply and long-term lifecycle support.

Supply support for MAX6961ATH+T 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

Maxim Integrated, now part of Analog Devices, designs precision analog and mixed-signal ICs for industrial, communications, and consumer applications.

The MAX6961ATH+T belongs to the MAX6960–MAX6963 family of 4-wire serial LED drivers engineered specifically for scalable, flicker-free, animated dot-matrix signage - emphasizing ease of multi-device synchronization, LED health monitoring, and low-software-overhead graphics rendering.

FAQ

What display configurations does the MAX6961ATH+T support?

The MAX6961ATH+T supports either two monocolor 8×8 matrix digits or one RGY (red/green/yellow) 8×8 matrix digit. It does not support RGB or bicolor anode-row configurations natively. Its 2-bit-per-pixel intensity control applies only to monocolor and RGY modes - unlike the MAX6960ATH+T, which extends this to RGB. All configurations use cathode-row driving with COL1–COL16 sourcing current and ROW1–ROW8 sinking current.

How does the MAX6961ATH+T handle LED fault detection?

The MAX6961ATH+T performs real-time open-circuit and short-circuit detection on every LED segment by monitoring voltage compliance at COL and ROW terminals during active drive cycles. Detected faults are reported via dedicated status registers accessible through the 4-wire interface. This capability is fully integrated and requires no external sensing components - enabling immediate identification of failed LEDs in large display panels without additional circuitry.

Can the MAX6961ATH+T drive blue or high-Vf LEDs directly?

No, the MAX6961ATH+T cannot drive blue LEDs or other high-forward-voltage LEDs (≥3.5V) directly. Its COL outputs are rated for up to 2.5V LED forward drop under normal operation. For blue or high-Vf displays, the MAX6961ATH+T must be used with external pass transistors in anode-row configuration - retaining full functionality including pixel-level intensity control, fault detection, and memory plane management as described in Figure 17 of the datasheet.

What is the role of the ADDIN/ADDOUT/ADDCLK pins on the MAX6961ATH+T?

The ADDIN/ADDOUT/ADDCLK pins implement a local 3-wire daisy-chain bus that automatically allocates memory map addresses among interconnected MAX6961ATH+T devices. ADDIN receives address data from the preceding device (or V+ for the first device), ADDOUT forwards it to the next, and ADDCLK synchronizes the allocation. This eliminates manual address configuration and enables plug-and-play expansion of display size - with ADDOUT doubling as a plane-change interrupt output for host notification.

Does the MAX6961ATH+T require an external crystal or oscillator?

No, the MAX6961ATH+T does not require an external crystal. It accepts an external CMOS clock signal (1MHz–8.5MHz) on the OSC pin, which serves as the master multiplex clock. The device includes built-in dead-clock protection that disables outputs if the OSC signal falls below 50kHz, preventing display corruption during clock failure. No crystal, resonator, or oscillator IC is needed - simplifying bill-of-materials and layout.