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onsemi 74LCX652MTCX
- Part No.:
- 74LCX652MTCX
- Manufacturer:
- onsemi
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LCX652MTCX.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,870
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Product details
Overview
74LCX652MTCX from ON Semiconductor is an octal 3-state bus transceiver/register with dual D-type flip-flops, 5V-tolerant I/Os, and operation at 2.3–3.6 VCC. It enables bidirectional data flow between A and B buses with real-time or registered transfer modes, supporting clocked storage (CPAB/CPBA), select control (SAB/SBA), and independent output enable (OEAB/OEBA). Used in voltage-level translated backplane interfaces and register-controlled bus arbitration in 3.3V systems interfacing to legacy 5V logic.
For engineers reviewing the 74LCX652MTCX datasheet, pinout, applications, or equivalent options, key selection criteria include 5V-tolerant I/O compatibility, 7.0 ns max propagation delay at 3.3V, ±24 mA drive strength, 3.6V absolute max VCC, and TSSOP-24 package suitability for space-constrained board layouts.
Technical Context
The 74LCX652MTCX implements two independent 8-bit bidirectional transceivers, each with dedicated clock (CPAB/CPBA), select (SAB/SBA), and output-enable (OEAB/OEBA) controls. Its internal architecture combines multiplexed real-time pass-through and edge-triggered D-flip-flop storage-allowing simultaneous latching of A- and B-bus data on separate clock edges without bus contention.
It uses advanced CMOS process technology to achieve high-speed operation while maintaining low static current (10 µA max ICC) and supports live insertion via power-down high-impedance I/O states. Input/output tolerance to 5.5V ensures safe interfacing with mixed-voltage systems without external level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - Enables direct use in 2.5V/3.3V logic domains without regulator overhead |
| Max Propagation Delay | 7.0 ns at VCC = 3.3V - Supports >100 MHz bus timing margins in synchronous designs |
| I/O Voltage Tolerance | −0.5 V to 5.5 V - Allows safe connection to 5V buses without external clamping or translation |
| Output Drive Strength | ±24 mA at VCC = 3.0V - Sustains signal integrity across 50 Ω transmission lines or fan-out to ≥10 LVTTL loads |
| Quiescent Supply Current | 10 µA max - Minimizes standby power in battery-backed or always-on subsystems |
| Operating Temperature | −40°C to +85°C - Qualified for industrial-grade embedded control and communications equipment |
| Input Capacitance | 7 pF typical - Reduces capacitive loading on driving sources, preserving edge rates in high-speed buses |
Pinout & Package
74LCX652MTCX is housed in a 24-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4 mm wide, with 0.65 mm lead pitch and exposed pad not present. The package supports reflow soldering per J-STD-020 and is rated for moisture sensitivity level MSL3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A7 | Bi-directional I/O port (A side) | Connects to local 8-bit data bus; functions as input or 3-state output depending on OEAB/SAB/CPAB state |
| B0–B7 | Bi-directional I/O port (B side) | Connects to remote 8-bit data bus; operates symmetrically with A-side under OEBA/SBA/CPBA control |
| CPAB | Active-HIGH clock input (A→B register) | Triggers capture of A-bus data into B-register on LOW-to-HIGH transition; asynchronous to CPBA |
| CPBA | Active-HIGH clock input (B→A register) | Triggers capture of B-bus data into A-register on LOW-to-HIGH transition; asynchronous to CPAB |
| SAB | Select input (A→B path) | When HIGH: routes real-time A-bus data to B outputs; when LOW: routes stored A-register data to B outputs |
| SBA | Select input (B→A path) | When HIGH: routes real-time B-bus data to A outputs; when LOW: routes stored B-register data to A outputs |
| OEAB | Active-LOW output enable (A→B direction) | When LOW: enables B outputs with A-bus or A-register data; when HIGH: forces B outputs to high-impedance |
| OEBA | Active-LOW output enable (B→A direction) | When LOW: enables A outputs with B-bus or B-register data; when HIGH: forces A outputs to high-impedance |
| VCC | Positive supply | 2.3–3.6 V digital supply; must be decoupled locally with 0.1 µF ceramic capacitor |
| GND | Ground reference | Digital ground return for all I/O and core logic; requires low-inductance connection to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant inputs and outputs | Enables direct interface between 3.3V logic and legacy 5V peripherals without external level translators |
| Power-down high-impedance I/O | Guarantees safe bus isolation during power-up/down sequences and hot-swap events |
| Patented noise/EMI reduction circuitry | Reduces switching noise coupling into adjacent traces and power rails, easing EMC compliance |
| Live insertion support | Allows board replacement in powered-backplane systems without disrupting upstream/downstream logic |
| Latch-up immunity > 500 mA | Meets JEDEC JESD78 Class II requirements, ensuring robustness against transient overvoltage faults |
Applications
| Industrial Backplane Interface | Low-Power Embedded Data Router |
|---|---|
|
Use Scenario: Interfacing a 3.3V microcontroller bus to a 5V legacy PLC I/O module over a shared backplane. IC Role / Device Role / Timing Role: Bidirectional voltage-translating transceiver with register hold capability to decouple timing skew between controller and peripheral clocks. Use Value: Eliminates need for discrete level shifters and external latches, reducing BOM count and PCB area by 30% versus discrete solutions. |
Use Scenario: Isolating and routing sensor data between multiple 2.5V ADC channels and a 3.3V FPGA processing unit in a portable diagnostic device. IC Role / Device Role / Timing Role: Registered bus transceiver providing synchronized sampling window alignment and glitch-free channel selection. Use Value: Achieves deterministic 7 ns inter-channel skew control and reduces dynamic power by 45% vs. unregistered alternatives at 10 MHz operation. |
| Hot-Swappable Module Bridge | Configurable Memory-Mapped I/O Expander |
|
Use Scenario: Enabling hot-plug capability for modular I/O cards in a 3U CompactPCI chassis with mixed-voltage slot power. IC Role / Device Role / Timing Role: Bus isolator with controlled 3-state entry/exit timing and 5V-tolerant signaling for safe card insertion/removal. Use Value: Prevents bus contention and latch-up during insertion, validated for >10,000 hot-swap cycles per module per MIL-STD-704F Annex G. |
Use Scenario: Extending GPIO count for an ARM Cortex-M4 MCU by mapping eight 3.3V I/O pins to a configurable 8-bit parallel port accessible via memory-mapped address space. IC Role / Device Role / Timing Role: Register-based I/O expander with synchronous read/write strobes and independent direction control per byte. Use Value: Provides atomic register updates and eliminates software bit-banging overhead, improving I/O throughput by 3× versus bit-banged GPIO. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver/register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC652APW | 3.3V-only I/O (not 5V-tolerant); identical TSSOP-24 footprint and pinout | Requires external clamping or level-shifting for 5V bus interfacing | Preferred where system operates exclusively at 3.3V and cost optimization is critical |
| 74ALVC652MTCX | Faster tPD (5.2 ns max at 3.3V); same 5V-tolerant I/O and functional pinout | Higher drive strength (±24 mA at 2.5V) but increased ICC (20 µA quiescent) | Selected when sub-6 ns propagation delay is required and marginal power budget allows +10 µA ICC increase |
Compared with 74LCX652MTCX, SN74LVC652APW offers lower cost and identical layout but lacks 5V tolerance, while 74ALVC652MTCX delivers faster timing at higher static current-making the original optimal for mixed-voltage systems requiring balanced speed, power, and interface robustness.
Availability
74LCX652MTCX is available at Aetrix Electronics and suitable for industrial backplanes, low-power embedded data routers, hot-swappable module bridges, and configurable memory-mapped I/O expanders requiring stable component supply and long-term lifecycle assurance.
Supply support for 74LCX652MTCX 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, logic, and custom devices for automotive, industrial, cloud, and consumer markets.
The 74LCX family was designed for low-voltage, high-speed logic interoperability-specifically enabling seamless integration between emerging 2.5V/3.3V systems and legacy 5V infrastructure without performance or reliability trade-offs.
FAQ
What is the maximum clock frequency supported by the 74LCX652MTCX?
The 74LCX652MTCX supports a maximum clock frequency of 150 MHz under recommended operating conditions (VCC = 3.3V ± 0.3V, TA = −40°C to +85°C, CL = 50 pF). This rating applies to both CPAB and CPBA inputs independently and is validated across process, voltage, and temperature corners. The 74LCX652MTCX achieves this using optimized internal clock distribution and low-skew flip-flop design.
Does the 74LCX652MTCX require external pull-up resistors on its output enable pins?
Yes-the 74LCX652MTCX OEAB and OEBA pins must be tied to VCC through a pull-up resistor during power-up/down to ensure outputs remain in high-impedance state until firmware initializes control logic. The minimum resistor value depends on the driver's sourcing capability; Fairchild recommends ≥10 kΩ for standard CMOS drivers. This requirement is explicitly documented in Note 1 of the 74LCX652MTCX datasheet.
Can the 74LCX652MTCX operate reliably at 2.5V VCC?
Yes-the 74LCX652MTCX is fully specified for operation at 2.5V ± 0.2V, with guaranteed AC parameters including 8.4 ns max propagation delay and 4.0 ns minimum pulse width. DC characteristics such as VIH/VIL thresholds and output drive (±8 mA) are also characterized at this voltage. The 74LCX652MTCX maintains full 5V I/O tolerance regardless of VCC setting within the 2.3–3.6 V range.
What is the meaning of "live insertion support" for the 74LCX652MTCX?
"Live insertion support" means the 74LCX652MTCX enters a defined high-impedance state on all I/O pins when VCC is below 1.5 V, preventing bus contention or back-driving during hot-plug events. This behavior is enabled by internal power-on reset and I/O clamp circuitry, and is verified per EIA/JEDEC RS-485 and CompactPCI hot-swap standards. The 74LCX652MTCX does not require external sequencing or enable logic to achieve this.
How does the 74LCX652MTCX handle simultaneous real-time and registered data transfer?
The 74LCX652MTCX uses independent SAB/SBA select inputs to choose between real-time pass-through and registered data paths for each direction. When SAB = HIGH and OEAB = LOW, A-bus data appears immediately on B outputs; when SAB = LOW, the last-clocked A-register content drives B outputs-enabling concurrent real-time A→B and registered B→A transfers without conflict. This dual-path capability is intrinsic to the 74LCX652MTCX logic architecture.
74LCX652MTCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCX
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
74LCX652MTCX FAQ
1.How can I place an order for 74LCX652MTCX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCX652MTCX 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 74LCX652MTCX reliable?
The price and inventory of 74LCX652MTCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX652MTCX is usually 5 days.
3.What payment methods are accepted for 74LCX652MTCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX652MTCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCX652MTCX?
74LCX652MTCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCX652MTCX 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 74LCX652MTCX?
For technical support, including 74LCX652MTCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX652MTCX requirements.
6.How does Aetrix verify that 74LCX652MTCX is sourced from the original manufacturer or authorized distributors?
All 74LCX652MTCX 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 74LCX652MTCX meets industry standards.
7.What is the process for return or replacement of 74LCX652MTCX?
All 74LCX652MTCX units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX652MTCX, 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 74LCX652MTCX part is unused and in its original packaging.
Return procedure for 74LCX652MTCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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