Texas Instruments MM145453V

Overview

MM145453V from Texas Instruments is a CMOS monolithic LCD segment driver IC designed for direct static drive of up to 33 segments in 4½-digit 7-segment or alphanumeric displays. It operates from 3V to 10V, supports TTL-compatible serial data input, and features internal oscillator control (75 Hz BP_OUT) with external clock option via BP_IN. Used in digital voltmeters, thermometers, and industrial indicator panels.

For engineers reviewing the MM145453V datasheet, MM145453V pinout, MM145453V application, or MM145453V equivalent, this page delivers verified technical context on its serial interface timing, backplane drive architecture, latch-based display data retention, and PLCC-44 package implementation - critical for display subsystem integration and BOM validation.

Technical Context

The MM145453V implements a static segment drive architecture using master-slave shift registers and output latches, accepting 33-bit segment data plus start and don't-care bits over a 2-wire serial interface (DATA and CLOCK). Data loading occurs synchronously at the rising edge of the 36th clock cycle, followed by automatic shift register reset on the falling edge.

It integrates an RC-tunable internal oscillator (via OSC_IN pin) that feeds a 16:1 divider to generate the 75 Hz backplane output (BP_OUT); alternatively, BP_IN accepts an externally supplied 50% duty-cycle square wave for synchronized AC-coupled LCD driving - essential for noise-sensitive DVM and instrumentation applications.

Key Specifications

Pinout & Package

MM145453V is housed in a 44-pin plastic leaded chip carrier (PLCC) package per JEDEC MS-018, designated FN0044A, with gull-wing leads and optional pin 1 identification. The package is RoHS-compliant, green (low-halogen), and rated MSL Level-3 (245°C peak, 168 hr floor life).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC145453 and MM5453, the MM145453V delivers identical segment drive functionality in a RoHS-compliant PLCC-44 package with added BP_IN synchronization and guaranteed production status - making it the only viable choice for new industrial and instrumentation designs requiring long-term component availability and EMI-robust display operation.

Availability

MM145453V is available at Aetrix Electronics and suitable for digital multimeters, industrial panel indicators, and remote environmental monitors requiring stable component supply, RoHS compliance, and long-lifecycle support.

Supply support for MM145453V 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 specializing in analog, embedded processing, and logic technologies with over 90 years of innovation in industrial, automotive, and consumer electronics.

The MM145453V belongs to TI's legacy LCD driver product line, engineered specifically for low-power, static-drive alphanumeric and numeric displays in instrumentation and control applications where reliability and long-term manufacturability are critical.

FAQ

What is the primary function of the MM145453V in an LCD display system?

The MM145453V serves as a static segment driver IC that directly controls up to 33 LCD segments using latched output data. It receives serial segment data via a 2-wire interface, stores it in internal latches, and drives segments with precise voltage biasing - eliminating the need for continuous microcontroller polling or external memory. Its design ensures stable, flicker-free display output in instruments like digital multimeters and thermometers.

Does the MM145453V require an external crystal or oscillator to operate?

No, the MM145453V does not require an external crystal. It includes an internal RC oscillator controlled by external components (ROSC_IN resistor and COSC_IN capacitor) connected to the OSC_IN pin, generating a ~75 Hz backplane output after 16:1 division. Alternatively, an external 50% duty-cycle clock can be applied to BP_IN to bypass the internal oscillator - useful for noise-sensitive applications like DVMs synchronized to AC line frequency.

Can the MM145453V drive a 4½-digit 7-segment display without additional components?

Yes, the MM145453V is explicitly designed to drive a full 4½-digit 7-segment display (33 segments including decimal points and sign) without external drivers or multiplexing circuitry. Its 33 dedicated segment outputs and single backplane output (BP_OUT) provide complete static drive capability. Only passive RC components are needed if using the internal oscillator - no character generator or external logic is required.

What is the significance of the "/NOPB" suffix in MM145453V/NOPB?

The "/NOPB" suffix in MM145453V/NOPB indicates that the device is lead-free and RoHS-compliant, with CU SN (copper-tin) lead finish and green (low-halogen) packaging. This variant is ACTIVE per TI's packaging addendum, ensuring reliable supply and compliance with modern environmental regulations - unlike the NRND MM145453V without /NOPB, which lacks RoHS certification and is not recommended for new designs.

How does the MM145453V handle data loading and display update timing?

The MM145453V uses a fixed 36-clock-cycle protocol: one start bit ('1'), 33 segment bits, and two don't-care bits. At the rising edge of the 36th clock, an internal LOAD signal transfers data from the shift register to output latches; at the falling edge, a RESET clears the shift register. This deterministic timing eliminates external control signals and ensures glitch-free display updates - a key advantage over asynchronous or software-timed alternatives.