Texas Instruments MM5483N/NOPB

Overview

MM5483N/NOPB from Texas Instruments is a monolithic CMOS LCD display driver in 40-pin PDIP packaging, capable of driving up to 31 segments with serial data input/output, TTL-compatible logic levels, and wide 3.0–10 V supply operation. It supports 4½-digit 7-segment, alphanumeric, and bar-graph displays in digital clocks, voltmeters, and industrial control indicators.

For engineers reviewing the MM5483N/NOPB datasheet, MM5483N/NOPB pinout, MM5483N/NOPB application, or MM5483N/NOPB equivalent, key selection considerations include segment count (31), cascade capability for expanded display, low IDD (2.5 µA at 3 V), 500 kHz max clock frequency, and dual-mode control (2-wire/3-wire).

Technical Context

The MM5483N/NOPB implements a serial-in, parallel-out shift register with latch-controlled output buffers, enabling asynchronous load pulses to transfer data from shift register to segment drivers. Its architecture supports both 2-wire (load tied to VDD) and 3-wire (separate load signal) interface modes.

It features dedicated backplane (BP_Out) outputs with ±320 µA drive capability and segment outputs rated for ±20 µA, optimized for AC-driven LCDs. Timing parameters-including tDS (300 ns data setup), tLW (500 ns minimum load pulse), and fC (500 kHz max clock)-are specified across −40°C to +85°C operating range.

Key Specifications

Pinout & Package

MM5483N/NOPB is housed in a 40-pin plastic dual-in-line package (PDIP), package drawing NFJ0040A, with 0.6-inch body width and 0.1-inch lead pitch. Pin 1 is marked by notch or dot on top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MM5483V/NOPB and ICM7211AMI, the MM5483N/NOPB offers unique serial cascade capability and 31-segment flexibility in through-hole PDIP-valuable for legacy repair, prototyping, and low-volume industrial replacements despite its obsolete status.

Availability

MM5483N/NOPB is available at Aetrix Electronics and suitable for digital clock, voltmeter, and industrial control indicator applications requiring stable component supply for maintenance, legacy system repair, and low-volume production.

Supply support for MM5483N/NOPB 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

Texas Instruments is a global semiconductor company founded in 1930, specializing in analog, embedded processing, and logic ICs with broad industrial, automotive, and consumer applications.

The MM5483N/NOPB belongs to TI's legacy LCD driver product line, designed specifically for low-power, microcontroller-based alphanumeric and numeric display systems in instrumentation and control panels.

FAQ

What is the primary function of the MM5483N/NOPB?

The MM5483N/NOPB is a serial-input LCD segment driver IC that converts incoming serial data into parallel segment outputs for driving up to 31 LCD segments and one backplane. It operates across 3.0–10 V, supports 2-wire and 3-wire interfaces, and is used in digital clocks, voltmeters, and industrial readouts. The MM5483N/NOPB integrates shift register, latch, and output buffers in a single 40-pin PDIP package.

Is the MM5483N/NOPB still in active production?

No-the MM5483N/NOPB is marked as OBSOLETE by Texas Instruments per the PACKAGE OPTION ADDENDUM. While not in active production, Aetrix Electronics maintains traceable inventory for legacy support, repair, and low-volume industrial use. For new designs, TI recommends the active MM5483V/NOPB in PLCC-44 packaging.

Can the MM5483N/NOPB drive a 4½-digit 7-segment display?

Yes-the MM5483N/NOPB provides exactly 31 segment outputs, which fully supports a 4½-digit 7-segment display (4 × 7 = 28 segments + 3 decimal points or annunciators). Its architecture includes dedicated backplane output and latch-controlled timing, enabling stable static or multiplexed LCD drive without external components. The MM5483N/NOPB datasheet confirms this configuration in its Applications section.

What are the key timing requirements for reliable operation of the MM5483N/NOPB?

The MM5483N/NOPB requires tDS ≥300 ns (data setup before clock), tDH ≥100 ns (data hold after clock), and tLW ≥500 ns (minimum load pulse width). Clock frequency must not exceed 500 kHz at VDD ≥4.7 V. These values ensure correct shift register loading and latch transfer. The MM5483N/NOPB timing diagram (Figure 7 in SNLS368E) validates these constraints across −40°C to +85°C.

Does the MM5483N/NOPB support cascading with other identical drivers?

Yes-the MM5483N/NOPB includes a dedicated Data Out pin that passes shifted-out bits to the Data In of a downstream device, enabling seamless daisy-chaining. This cascade capability allows expansion beyond 31 segments while maintaining single-MCU control. The MM5483N/NOPB functional description explicitly states "cascaded to increase this number" and shows cascading in Figure 4 of the datasheet.