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onsemi 74LVTH652MTCX
- Part No.:
- 74LVTH652MTCX
- Manufacturer:
- onsemi
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LVTH652MTCX.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,591
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Product details
Overview
74LVTH652MTCX from Fairchild Semiconductor is a low-voltage octal transceiver/register with 3-STATE outputs, designed for bidirectional data flow between A and B buses in 3.3V systems with 5V-tolerant I/O. It integrates D-type flip-flops, dual clock inputs (CPAB/CPBA), dual select inputs (SAB/SBA), and independent output enables (OEAB/OEBA). Key confirmed specs: VCC = 2.7–3.6 V, tPLH ≤ 5.6 ns (VCC = 3.3 V), IOL = 64 mA, IOH = −32 mA, and bushold inputs eliminate external pull-ups. Used in bus isolation and register-controlled data routing in industrial backplanes.
For engineers reviewing the 74LVTH652MTCX datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, functional mode mapping, real-time vs. registered transfer behavior, bushold input drive requirements, and TSSOP-24 package-specific timing and drive capability - all validated against Fairchild DS012018 (Nov 2000).
Technical Context
The 74LVTH652MTCX implements a dual-bus architecture with independent clocked storage (CPAB/CPBA) and multiplexed real-time or registered path selection via SAB/SBA. Its BiCMOS process enables TTL-compatible 5V I/O while operating at 3.3V VCC, supporting mixed-voltage system interfacing without level shifters.
All eight A-side and eight B-side pins serve as bidirectional I/O with 3-STATE control per direction (OEAB/OEBA). Data latching occurs on LOW-to-HIGH clock transitions regardless of OE state; output enable only affects driver activation, not register loading. Bushold circuitry maintains valid logic levels on unused inputs without external resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - Specifies strict 3.3V nominal supply tolerance; operation outside this range risks latch-up or parametric failure. |
| IOH / IOL | −32 mA / +64 mA - Enables direct driving of heavy capacitive loads or multiple TTL inputs without buffer amplification. |
| tPLH / tPHL | 1.3 ns (min) to 6.4 ns (max) - Guarantees sub-7 ns propagation for registered data paths under worst-case voltage/temperature. |
| Bushold Drive | ±75 µA at VI = 0.8 V / 2.0 V - Ensures stable input retention with <100 µA external disturbance, eliminating pull-up/pull-down components. |
| Operating Temp | −40°C to +85°C - Qualified for extended industrial temperature environments without derating. |
| fMAX | 150 MHz - Supports high-speed synchronous bus transfers up to 150 million cycles per second in SOIC/TSSOP packages. |
| VI Input Range | 0 V to 5.5 V - Allows direct connection to 5V logic sources without clamping diodes or external protection. |
Pinout & Package
74LVTH652MTCX is packaged in a 24-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4 mm wide, with lead pitch of 0.65 mm and body dimensions 7.8 mm × 4.4 mm × 1.2 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A7 | Data Register A Inputs / 3-STATE Outputs | Bidirectional port: stores data on CPAB edge when enabled; drives or floats based on OEAB state. |
| B0–B7 | Data Register B Inputs / 3-STATE Outputs | Bidirectional port: stores data on CPBA edge when enabled; drives or floats based on OEBA state. |
| CPAB | Register A Clock Input | LOW-to-HIGH transition clocks data from B bus into A register; active regardless of OEAB/OEBA state. |
| CPBA | Register B Clock Input | LOW-to-HIGH transition clocks data from A bus into B register; active regardless of OEAB/OEBA state. |
| SAB | Select A-to-B Path Control | When HIGH, routes real-time A data to B bus; when LOW, routes stored A data to B bus (if OEBA active). |
| SBA | Select B-to-A Path Control | When HIGH, routes real-time B data to A bus; when LOW, routes stored B data to A bus (if OEAB active). |
| OEAB | Output Enable A-to-B | LOW enables A-port drivers onto B bus; HIGH places A outputs in 3-STATE (high-impedance). |
| OEBA | Output Enable B-to-A | LOW enables B-port drivers onto A bus; HIGH places B outputs in 3-STATE (high-impedance). |
Key Features
| Feature | Design Value |
|---|---|
| 5V-Tolerant I/O | Supports direct interface to legacy 5V TTL systems while powered from 3.3V supply - no level-shifter required. |
| Bushold Inputs | Retains last-valid logic state on unconnected or floating inputs using internal feedback; eliminates board-level pull-up resistors. |
| Live Insertion Support | Power-Up/Down high-impedance behavior prevents bus glitches during hot-plug events in modular backplane systems. |
| Dual Independent Registers | Enables simultaneous capture of A→B and B→A data streams with separate clocks (CPAB/CPBA) and select controls (SAB/SBA). |
| High Drive Strength | 64 mA sink / 32 mA source capability allows direct fanout to ≥10 standard TTL loads without buffering. |
Applications
| Industrial Backplane Bus Isolation | Legacy System Voltage Translation |
|---|---|
|
Use Scenario: Isolating control and data buses between hot-swappable modules in programmable logic controllers (PLCs) and distributed I/O racks. IC Role / Device Role / Timing Role: Bidirectional bus transceiver with register hold capability ensures glitch-free data handoff during module insertion/removal. Use Value: Power-up/down high-impedance and bushold inputs prevent bus contention and signal corruption during live insertion events. |
Use Scenario: Interfacing 3.3V FPGA or microcontroller peripherals with existing 5V sensor or actuator subsystems in factory automation. IC Role / Device Role / Timing Role: Level-translating octal transceiver enabling synchronous data exchange without external voltage translators. Use Value: 5V-tolerant inputs and 3.3V-compatible outputs eliminate discrete level-shifting components and reduce BOM count. |
| Registered Data Multiplexing | Real-Time Bus Bridging |
|
Use Scenario: Capturing and synchronizing asynchronous data bursts from two independent sensor channels before forwarding to a shared ADC controller. IC Role / Device Role / Timing Role: Dual-register transceiver storing A and B bus data on independent clock edges for deterministic timing alignment. Use Value: Independent CPAB/CPBA and SAB/SBA controls allow time-aligned sampling and multiplexed output without software intervention. |
Use Scenario: Providing transparent, low-latency pass-through between two 3.3V processor buses in a redundant communication architecture. IC Role / Device Role / Timing Role: Real-time transceiver mode (SAB/SBA = HIGH, OEAB/OEBA = LOW) enables sub-2 ns propagation delay path. Use Value: Propagation delay as low as 1.3 ns (typical) supports >150 MHz synchronous bus bridging with minimal added latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver/register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVT652PWR | TI part uses LVT logic family; identical pinout and function but higher ICCZ (0.35 mA vs. 0.19 mA) and slightly lower fMAX (125 MHz). | Lower static power draw makes 74LVTH652MTCX preferable in battery-backed or thermally constrained industrial modules. | Choose 74LVTH652MTCX for lower quiescent current and higher clock frequency; SN74LVT652PWR acceptable where TI supply chain preference applies. |
| 74ALVCH16652GR | 16-bit variant in 48-pin TSSOP; double data width but incompatible pinout and package - requires PCB redesign. | Not suitable for drop-in replacement; intended for wider bus architectures requiring parallel 16-bit register transfer. | Only consider 74ALVCH16652GR when upgrading to 16-bit data paths; 74LVTH652MTCX remains optimal for space-constrained 8-bit designs. |
Compared with SN74LVT652PWR and 74ALVCH16652GR, the 74LVTH652MTCX offers the best balance of speed (150 MHz), low ICCZ (0.19 mA), and TSSOP-24 footprint - making it ideal for compact, high-throughput industrial bus interfaces where pin compatibility and thermal efficiency are critical.
Availability
74LVTH652MTCX is available at Aetrix Electronics and suitable for industrial backplane bus isolation, legacy system voltage translation, registered data multiplexing, and real-time bus bridging requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74LVTH652MTCX 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
Fairchild Semiconductor was a leading analog and power IC manufacturer, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and telecom infrastructure.
The 74LVTH652MTCX belongs to Fairchild's LVTH (Low-Voltage TTL-High Speed) logic family, engineered for mixed-voltage system interoperability and high-drive, low-glitch bus management in harsh industrial environments.
FAQ
What is the maximum clock frequency supported by the 74LVTH652MTCX?
The 74LVTH652MTCX supports a guaranteed maximum clock frequency of 150 MHz across the full operating temperature range (−40°C to +85°C) and supply voltage range (2.7 V to 3.6 V), as specified in Fairchild DS012018. This rating applies to both CPAB and CPBA inputs and is validated for TSSOP packaging. The 74LVTH652MTCX achieves this performance using advanced BiCMOS technology, delivering ABT-class speed at 3.3V operation.
Does the 74LVTH652MTCX require external pull-up resistors on unused inputs?
No, the 74LVTH652MTCX does not require external pull-up resistors on unused inputs due to integrated bushold circuitry. Each input maintains its last-valid logic state with ±75 µA drive capability at VI = 0.8 V / 2.0 V, as confirmed in the DC Electrical Characteristics table of the datasheet. This feature eliminates board-level passive components and reduces layout complexity for the 74LVTH652MTCX in high-density industrial PCBs.
Can the 74LVTH652MTCX interface directly with 5V logic devices?
Yes, the 74LVTH652MTCX supports direct 5V-tolerant interfacing: its inputs accept VI up to 5.5 V while operating from a 3.3V supply, and its outputs drive 5V TTL loads with −32 mA / +64 mA capability. This eliminates external level shifters in mixed-voltage systems. The 74LVTH652MTCX achieves this via robust input clamp diodes and BiCMOS output stages, as documented in Absolute Maximum Ratings and DC Electrical Characteristics.
What is the purpose of the SAB and SBA pins on the 74LVTH652MTCX?
The SAB and SBA pins on the 74LVTH652MTCX control multiplexing between real-time and registered data paths: SAB = HIGH enables real-time A-to-B transfer; SAB = LOW enables stored-A-to-B transfer. Similarly, SBA selects B-to-A path mode. These pins operate independently of OEAB/OEBA and CPAB/CPBA, allowing flexible bus arbitration without altering clock or enable states - a key capability confirmed in the Functional Description and Truth Table of the 74LVTH652MTCX datasheet.
Is the 74LVTH652MTCX suitable for hot-plug applications?
Yes, the 74LVTH652MTCX supports live insertion/extraction per its datasheet features list. Its Power Up/Down high-impedance behavior ensures all outputs remain in 3-STATE during supply ramp-up or ramp-down, preventing bus contention. Combined with bushold inputs and 5V-tolerant I/O, this makes the 74LVTH652MTCX appropriate for modular backplane systems where cards are inserted or removed while powered - a design requirement explicitly validated for the 74LVTH652MTCX in industrial environments.
74LVTH652MTCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LVTH
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
74LVTH652MTCX FAQ
1.How can I place an order for 74LVTH652MTCX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVTH652MTCX 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 74LVTH652MTCX reliable?
The price and inventory of 74LVTH652MTCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVTH652MTCX is usually 5 days.
3.What payment methods are accepted for 74LVTH652MTCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVTH652MTCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVTH652MTCX?
74LVTH652MTCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVTH652MTCX 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 74LVTH652MTCX?
For technical support, including 74LVTH652MTCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVTH652MTCX requirements.
6.How does Aetrix verify that 74LVTH652MTCX is sourced from the original manufacturer or authorized distributors?
All 74LVTH652MTCX 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 74LVTH652MTCX meets industry standards.
7.What is the process for return or replacement of 74LVTH652MTCX?
All 74LVTH652MTCX units undergo pre-shipment inspection (PSI). If there is an issue with 74LVTH652MTCX, 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 74LVTH652MTCX part is unused and in its original packaging.
Return procedure for 74LVTH652MTCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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