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Texas Instruments MM145453VX/NOPB
- Part No.:
- MM145453VX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Display Drivers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
MM145453VX/NOPB.pdf
- Description:
- IC DRVR 7 SEG 4 1/2 DIGIT 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,634
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Product details
Overview
MM145453VX/NOPB from Texas Instruments is a CMOS monolithic LCD segment driver IC capable of directly driving up to 33 segments in static or multiplexed configurations, operating from 3V to 10V supply, with TTL-compatible serial data input and internal oscillator support for backplane generation. It is used in 4½-digit 7-segment displays for digital instrumentation.
For engineers reviewing the MM145453VX/NOPB datasheet, MM145453VX/NOPB pinout, MM145453VX/NOPB application, or MM145453VX/NOPB equivalent, key selection considerations include segment count (33), backplane output frequency (75 Hz typical), serial interface timing (500–1000 kHz clock), and PLCC-44 package compatibility with MC145453.
Technical Context
The MM145453VX/NOPB implements a static master-slave shift register architecture accepting 34-bit serial frames (1 start bit + 33 segment bits + 2 don't-care bits), with internal LOAD/RESET generated synchronously at the 36th clock edge. Data latching occurs on the rising edge of Clock In; outputs update only when new segment data differs from prior state.
It supports dual clock sources: an internal RC oscillator (set via ROSC_IN/COSC_IN, fOSC/16 = BP_OUT) or external 50% duty-cycle signal on BP_IN. OSC_IN must be grounded when using external backplane drive to prevent oscillation and reduce dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Segment Count | 33 independent segment outputs - enables full 4½-digit 7-segment + decimal point + sign + bar graph display control |
| Supply Voltage Range | 3V to 10V - supports battery-powered (3V) and industrial rail (5V/10V) operation without level-shifting |
| Backplane Output Frequency | 75 Hz typical (fOSC/16) - matches standard LCD AC drive requirements to prevent electrolysis and image retention |
| Max Clock Input Frequency | 1.0 MHz at VDD = 10V - allows fast serial loading (≤36 µs per frame) for responsive display updates |
| Average Supply Current | 10 µA at VDD = 5V - ultra-low standby current suitable for portable metering applications |
| Input Logic Thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V (VDD = 5V) - ensures robust TTL/CMOS logic interfacing across voltage rails |
| Operating Temperature | −40°C to +85°C - qualified for industrial and automotive cabin instrumentation environments |
Pinout & Package
MM145453VX/NOPB is housed in a 44-pin plastic leaded chip carrier (PLCC) package, designated FN0044A, with 0.050-inch pitch, 0.64-inch body size, and maximum height of 4.57 mm. Pin 1 is marked by a corner notch or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply | Primary power rail (3V–10V); powers all logic and output drivers |
| VSS | Ground reference | Common return for logic, segment, and backplane circuits |
| DATA | Serial data input | Accepts MSB-first stream with leading '1' start bit and 33 segment bits |
| CLOCK | Serial clock input | Edge-triggered input controlling shift register advancement and internal LOAD/RESET timing |
| BP_OUT | Backplane output | Drives common LCD backplane electrode at fOSC/16 (e.g., 75 Hz); sink/source ±500 µA @ 3V |
| BP_IN | External backplane input | Accepts 50% duty-cycle square wave for synchronized drive; requires OSC_IN grounded |
| OSC_IN | Oscillator timing input | RC node (ROSC_IN to VDD, COSC_IN to VSS) setting internal fOSC; disable by grounding for external BP_IN use |
| SEG0–SEG32 | Segment outputs | 33 open-drain CMOS outputs directly mapping to LCD segment electrodes; each sinks −40 µA @ 3V |
Key Features
| Feature | Design Value |
|---|---|
| 34-bit serial protocol with auto-load | Eliminates need for separate LOAD signal; internal LOAD/RESET generated precisely at 36th clock edge |
| Cascadable architecture | Multiple MM145453VX/NOPB devices can be daisy-chained via DATA OUT to expand beyond 33 segments |
| Alphanumeric + bar graph flexibility | All 33 outputs are individually controllable - supports custom symbols, status indicators, and analog-style bar displays |
| Internal oscillator with external sync option | RC-tuned BP_OUT generation or precise external BP_IN synchronization reduces EMI and improves DVM integration |
| Pin compatibility with MC145453 | Direct drop-in replacement for legacy Motorola/National Semiconductor designs without PCB modification |
Applications
| Digital Multimeter Display | Industrial Panel Meter |
|---|---|
Use Scenario: Driving 4½-digit LCD in handheld DMM with autoranging and hold functions. IC Role / Device Role / Timing Role: Static segment driver receiving serial data from microcontroller; generates synchronized backplane waveform. Use Value: Low IDD (10 µA @ 5V) extends battery life; 75 Hz BP_OUT minimizes flicker and DC bias-induced degradation. | Use Scenario: Front-panel display in DIN-rail mounted process controller showing temperature, pressure, and setpoint values. IC Role / Device Role / Timing Role: Primary LCD interface IC handling segment data latching and backplane timing under wide temperature range. Use Value: −40°C to +85°C rating ensures reliability in unconditioned enclosures; 3V–10V supply accommodates varied industrial rails. |
| Digital Thermometer | Remote HVAC Display Unit |
Use Scenario: Battery-powered indoor/outdoor thermometer with max/min memory and °C/°F toggle. IC Role / Device Role / Timing Role: Segment driver with minimal MCU interface overhead; uses internal oscillator for autonomous BP_OUT. Use Value: Ultra-low quiescent current enables multi-year CR2032 operation; no external crystal or timing components required. | Use Scenario: Wall-mounted HVAC zone display receiving data over RS-485, showing setpoint, current temp, and mode. IC Role / Device Role / Timing Role: Local display controller converting serial command packets into segment states; supports cascaded configuration for multi-line units. Use Value: Cascading capability allows single MCU to drive multiple MM145453VX/NOPB units across shared DATA/CLOCK lines, reducing wiring complexity. |
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 | Pin-compatible predecessor; identical electrical specs but obsolete packaging (ceramic DIP) | Limited to through-hole assembly; no RoHS compliance or modern thermal performance | Select MM145453VX/NOPB for surface-mount production, RoHS compliance, and PLCC-44 reflow compatibility |
| MM5453V/NOPB | Same die, different pinout: MM5453 has dedicated BP_IN/OSC_IN pins swapped; not pin-compatible | Requires PCB redesign; lacks cascading capability and alphanumeric flexibility of MM145453VX/NOPB | Choose MM145453VX/NOPB when retaining existing PLCC-44 layout or requiring 33-segment direct drive with serial simplicity |
Compared with MC145453P and MM5453V/NOPB, MM145453VX/NOPB delivers verified PLCC-44 manufacturability, active TI support, and guaranteed 33-segment static drive without layout change - making it the preferred choice for new industrial display designs requiring long-term supply stability.
Availability
MM145453VX/NOPB is available at Aetrix Electronics and suitable for digital instrumentation, industrial panel meters, and portable test equipment requiring stable component supply, RoHS-compliant PLCC packaging, and long-lifecycle availability.
Supply support for MM145453VX/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 leader delivering analog, embedded processing, and logic solutions with emphasis on reliability, longevity, and industrial-grade qualification.
The MM145453VX/NOPB belongs to TI's legacy LCD driver product line, engineered specifically for low-power, high-reliability static and multiplexed segment driving in instrumentation and control panels.
FAQ
What is the maximum number of LCD segments the MM145453VX/NOPB can drive?
The MM145453VX/NOPB drives up to 33 LCD segments directly. Its output architecture supports static drive mode for full 4½-digit 7-segment displays including decimal points, sign indicators, and bar graph elements. Cascading multiple MM145453VX/NOPB devices expands total segment count beyond 33 while maintaining single serial interface control.
Does the MM145453VX/NOPB require an external crystal or oscillator?
No, the MM145453VX/NOPB does not require an external crystal. It features an internal RC oscillator controlled by ROSC_IN and COSC_IN components to generate BP_OUT. An external 50% duty-cycle clock may be applied to BP_IN if synchronization with system timing or AC line is needed - in which case OSC_IN must be grounded to disable the internal oscillator.
Is the MM145453VX/NOPB pin-compatible with the MC145453?
Yes, the MM145453VX/NOPB is explicitly specified as pin-compatible and functionally compatible with the MC145453. This allows direct replacement in legacy designs using the same PLCC-44 footprint and signal connections, preserving PCB layout while upgrading to TI's active, RoHS-compliant version.
What is the recommended backplane frequency for optimal LCD performance with the MM145453VX/NOPB?
The MM145453VX/NOPB delivers a typical backplane output frequency of 75 Hz when configured with ROSC_IN = 50 kΩ and COSC_IN = 0.01 µF at VDD = 5 V. This frequency aligns with standard LCD AC drive requirements to prevent electrochemical degradation and image retention while minimizing visible flicker.
Can the MM145453VX/NOPB drive both alphanumeric characters and bar graphs?
Yes, the MM145453VX/NOPB supports both alphanumeric and bar graph displays because all 33 segment outputs are individually controllable with no built-in character generator. The host microcontroller formats segment bit patterns before serial transmission, enabling custom symbols, status icons, and linear analog-style bar representations without hardware limitation.
MM145453VX/NOPB 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/NOPB FAQ
1.How can I place an order for MM145453VX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for MM145453VX/NOPB 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/NOPB reliable?
The price and inventory of MM145453VX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM145453VX/NOPB is usually 5 days.
3.What payment methods are accepted for MM145453VX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM145453VX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MM145453VX/NOPB?
MM145453VX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MM145453VX/NOPB 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/NOPB?
For technical support, including MM145453VX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM145453VX/NOPB requirements.
6.How does Aetrix verify that MM145453VX/NOPB is sourced from the original manufacturer or authorized distributors?
All MM145453VX/NOPB 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/NOPB meets industry standards.
7.What is the process for return or replacement of MM145453VX/NOPB?
All MM145453VX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with MM145453VX/NOPB, 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/NOPB part is unused and in its original packaging.
Return procedure for MM145453VX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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