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Texas Instruments MM145453VX
- Part No.:
- MM145453VX
- Manufacturer:
- Texas Instruments
- Category:
- Display Drivers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
MM145453VX.pdf
- Description:
- IC DRVR 7 SEG 4 1/2 DIGIT 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,577
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Product details
Overview
MM145453VX from Texas Instruments is a CMOS monolithic LCD segment driver IC designed for direct-drive 4½-digit 7-segment or alphanumeric LCD displays. It supports up to 33 segments, operates from 3V to 10V, features serial data input with TTL compatibility, and includes internal oscillator control for backplane generation at ~75 Hz (with 50 kΩ/0.01 µF). It is used in digital instrumentation such as voltmeters and thermometers.
For engineers reviewing the MM145453VX datasheet, MM145453VX pinout, MM145453VX application, or MM145453VX equivalent, key selection criteria include segment count (33), wide VDD range (3–10 V), low quiescent current (10 µA at 5 V), cascading capability, and PLCC-44 package compatibility with MC145453.
Technical Context
The MM145453VX implements a static master-slave shift register architecture that accepts 34-bit serial input (1 start bit + 33 segment bits + 2 don't-care bits), loading latched display data on the rising edge of the 36th clock cycle. Outputs update only when new segment data differs from prior state, enabling non-multiplexed direct drive.
It supports dual clock sources: an internal RC oscillator (via OSC_IN pin, fOSC ≈ 1/(ln(VDD/1V) × R × C), divided by 16 for BP_OUT) or external 50% duty-cycle signal on BP_IN. The internal oscillator is disabled when OSC_IN is grounded.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Range | 3 V to 10 V - enables operation across battery-powered (3 V) and industrial rail (10 V) systems without level-shifting. |
| Segment Count | 33 segments - sufficient for 4½-digit 7-segment displays plus decimal points or status indicators. |
| IDD (Quiescent) | 10 µA at VDD = 5 V - ultra-low standby power ideal for portable or energy-sensitive instrumentation. |
| BP_OUT Frequency | 75 Hz typical - matches standard LCD AC drive requirements to prevent electrolysis and DC bias damage. |
| Clock Input Max f | 1.0 MHz at VDD = 10 V - allows fast serial data loading (36 clocks per frame ≈ 27.8 kframes/s). |
| Input Logic Levels | VIL ≤ 0.8 V, VIH ≥ 2.0 V (VDD = 5 V) - ensures reliable interfacing with TTL and 3.3 V/5 V microcontrollers. |
| Operating Temp | −40°C to +85°C - qualified for industrial environments including panel meters and remote displays. |
Pinout & Package
MM145453VX is housed in a 44-pin plastic leaded chip carrier (PLCC) package, designated FN0044A, with 4.57 mm max height and JEDEC MS-018 compliance. Pin 1 is marked by a corner notch or dot; leads are gull-wing with CU SN finish, RoHS-compliant, MSL Level-3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply | Primary power rail (3–10 V); powers logic, oscillator, and output drivers. |
| VSS | Ground reference | Common return for all internal circuits and segment/backplane outputs. |
| DATA | Serial data input | CMOS/TTL-compatible input accepting 34-bit frame (start + 33 seg + 2 don't-care). |
| CLOCK | Serial clock input | Edge-triggered input; rising edge shifts data, falling edge of 36th cycle resets shift register. |
| OSC_IN | Oscillator timing node | Connects to ROSC_IN (to VDD) and COSC_IN (to GND) to set internal oscillator frequency. |
| BP_IN | External backplane clock input | Accepts 50% duty-cycle square wave; disables internal oscillator when used. |
| BP_OUT | Backplane drive output | Provides 75 Hz (typ.) square wave for LCD common electrode; sourced/sunk up to ±500 µA. |
| S0–S32 | Segment outputs | 33 open-drain CMOS outputs; sink/source ±40 µA (VDD = 3 V) for direct LCD segment drive. |
Key Features
| Feature | Design Value |
|---|---|
| Serial interface with no LOAD signal | 34-bit frame (1 start + 33 data + 2 don't-care) eliminates need for separate latch strobe, simplifying MCU firmware. |
| Cascadable architecture | Multiple MM145453VX devices can be daisy-chained via DATA OUT (pin 43) to expand segment count beyond 33. |
| Alphanumeric flexibility | All 33 outputs are individually controllable - supports custom glyphs, bar graphs, or mixed numeric/alphabet displays. |
| Internal oscillator with external sync option | RC-timed oscillator (75 Hz BP_OUT) or precise external BP_IN clock enables noise immunity in EMI-prone environments. |
| Pin compatibility with MC145453 | Direct drop-in replacement for legacy Motorola/National Semiconductor designs, preserving PCB layout and firmware. |
Applications
| Digital Panel Meter | Industrial Remote Display |
|---|---|
|
Use Scenario: A handheld digital multimeter displays voltage, current, and resistance readings using a 4½-digit 7-segment LCD. IC Role / Device Role / Timing Role: MM145453VX acts as the dedicated segment driver, receiving serial data from the MCU and generating synchronized backplane and segment waveforms. Use Value: Enables low-power, high-contrast LCD drive with minimal MCU GPIO usage and no external character generator required. |
Use Scenario: An industrial PLC-mounted temperature monitor displays real-time sensor data on a local LCD panel in a factory environment. IC Role / Device Role / Timing Role: MM145453VX serves as the display interface IC, operating across −40°C to +85°C and supporting long cable runs via robust serial interface. Use Value: Delivers stable segment drive under wide VDD (3–10 V) and temperature ranges, reducing BOM count versus discrete driver solutions. |
| Digital Clock/Timer | Portable Instrumentation |
|
Use Scenario: A benchtop countdown timer uses a 4-digit LCD with colon separators and mode indicators. IC Role / Device Role / Timing Role: MM145453VX drives all segments and colon dots while generating precise 75 Hz backplane waveform to prevent LCD degradation. Use Value: Internal oscillator eliminates need for external crystal or clock source, saving board space and cost in time-critical applications. |
Use Scenario: A battery-powered pH meter displays measurement results on a reflective LCD with low backlight dependency. IC Role / Device Role / Timing Role: MM145453VX functions as the ultra-low-power display controller, drawing only 10 µA at 5 V during idle periods. Use Value: Extends battery life significantly compared to higher-current alternatives, while maintaining full 33-segment control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LCD segment driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC145453P | Same pinout and function, but obsolete through ON Semiconductor; no RoHS-compliant packaging available. | Legacy repair only; lacks green (RoHS/no Sb/Br) finish and MSL-3 moisture rating of MM145453VX/NOPB. | Select MM145453VX/NOPB for new designs requiring RoHS compliance, volume traceability, and active supply support. |
| MM5453V | Pin-compatible predecessor with identical 33-segment capability but lower max clock frequency (500 kHz vs. 1 MHz at 10 V). | Less suitable for high-refresh-rate or cascaded multi-driver systems where faster serial throughput is needed. | MM145453VX offers improved speed headroom and updated manufacturing controls; preferred for performance-critical or scalable designs. |
Compared with MC145453P and MM5453V, the MM145453VX provides verified RoHS compliance, higher clock tolerance (1 MHz), and active production status - making it the only choice for new industrial instrumentation designs requiring long-term component availability and regulatory alignment.
Availability
MM145453VX is available at Aetrix Electronics and suitable for digital panel meters, industrial remote displays, digital clocks/timers, and portable instrumentation requiring stable component supply across extended temperature and voltage ranges.
Supply support for MM145453VX 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 leader specializing in analog, embedded processing, and high-reliability ICs for industrial, automotive, and consumer applications.
The MM145453VX belongs to TI's legacy LCD driver product line, engineered specifically for low-power, direct-drive alphanumeric and numeric LCD interfaces in instrumentation and control panels.
FAQ
What is the maximum number of LCD segments the MM145453VX can drive?
The MM145453VX drives up to 33 LCD segments directly. This capacity supports configurations such as 4½-digit 7-segment displays (including decimal points and sign indicators) or custom alphanumeric layouts. Each segment output (S0–S32) is independently controllable, and multiple MM145453VX devices can be cascaded to extend total segment count beyond 33.
Does the MM145453VX require an external crystal or clock source?
No - the MM145453VX includes an internal RC oscillator controlled via the OSC_IN pin (using ROSC_IN and COSC_IN components) to generate the backplane drive frequency (~75 Hz). An external 50% duty-cycle clock may be applied to BP_IN if synchronization with system timing or AC line rejection is required; in that case, OSC_IN must be grounded to disable the internal oscillator.
Is the MM145453VX pin-compatible with the MC145453?
Yes - the MM145453VX is explicitly documented as pin-compatible and functionally compatible with the MC145453. Both share identical PLCC-44 pinout (FN0044A), electrical behavior, and serial interface protocol, enabling direct replacement in legacy designs without PCB or firmware changes.
What is the recommended operating voltage range for the MM145453VX?
The MM145453VX operates over a VDD range of 3 V to 10 V, with specified performance across this full span. At 5 V, average supply current is 10 µA; at 10 V, it rises to 40 µA. This wide range supports both low-voltage battery operation and higher-voltage industrial rails without external regulation.
How does the MM145453VX handle serial data framing and loading?
The MM145453VX uses a fixed 34-bit serial frame: one leading '1' start bit, followed by 33 segment data bits, then two don't-care bits. Data is shifted in on CLOCK rising edges; after 36 edges, an internal LOAD signal (rising edge of 36th clock) transfers data to latches, and a RESET (falling edge) clears the shift register. No external LOAD signal is needed.
MM145453VX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Display Type:
- LCD
- Configuration:
- 7 Segment + DP, Alphanumeric and Bar Graph
- Interface:
- Serial
- Digits or Characters:
- 4.5 Digits
- Current - Supply:
- 40 µA
- Voltage - Supply:
- 3V ~ 10V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.58x16.58)
MM145453VX FAQ
1.How can I place an order for MM145453VX through Aetrix?
Please submit a Request for Quotation (RFQ) for MM145453VX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MM145453VX reliable?
The price and inventory of MM145453VX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM145453VX is usually 5 days.
3.What payment methods are accepted for MM145453VX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM145453VX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM145453VX?
MM145453VX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM145453VX order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MM145453VX?
For technical support, including MM145453VX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM145453VX requirements.
6.How does Aetrix verify that MM145453VX is sourced from the original manufacturer or authorized distributors?
All MM145453VX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MM145453VX meets industry standards.
7.What is the process for return or replacement of MM145453VX?
All MM145453VX units undergo pre-shipment inspection (PSI). If there is an issue with MM145453VX, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MM145453VX part is unused and in its original packaging.
Return procedure for MM145453VX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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