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onsemi 74LCX16646MTD
- Part No.:
- 74LCX16646MTD
- Manufacturer:
- onsemi
- Package:
- 56-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
74LCX16646MTD.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 56TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,589
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Product details
Overview
74LCX16646MTD from ON Semiconductor is a low-voltage 16-bit registered transceiver with 5V-tolerant I/O, designed for bidirectional data multiplexing between buses operating at 2.3–3.6 V while interfacing to 5 V logic. It features dual register storage (A and B), real-time transparent mode, direction control (DIR), clocked register load (CPAB/CPBA), and 3-STATE outputs. Used in voltage-level-agile bus interfaces in telecom backplanes and industrial controllers.
For engineers reviewing the 74LCX16646MTD datasheet, pinout, applications, or equivalent options, key selection criteria include 5V I/O tolerance, sub-6 ns propagation delay at 3.3 V, ±24 mA drive strength, register vs. transparent mode flexibility, and TSSOP-56 thermal and layout compatibility.
Technical Context
The 74LCX16646MTD implements two independent 8-bit register banks (A and B) with separate DIR, OE, CPAB/CPBA, and SAB/SBA controls per byte-enabling selective real-time transfer, stored-mode forwarding, or isolated register loading. Its dual-clock architecture allows asynchronous capture of data on either bus without bus contention.
All I/Os are 5V tolerant across VCC = 2.3–3.6 V, supporting mixed-voltage system interconnects. The device uses advanced CMOS process technology to achieve 5.2 ns max tPD at 3.3 V while maintaining ICC ≤ 20 µA in quiescent state, and includes patented EMI/noise reduction circuitry verified per JEDEC MO-153 TSSOP package requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - Enables direct operation from 2.5 V or 3.3 V rails without level shifters |
| Max Propagation Delay | 5.2 ns at VCC = 3.3 V - Supports >170 MHz clocked bus operation with tight timing margins |
| I/O Voltage Tolerance | 0 V to 5.5 V - Allows safe connection to legacy 5 V logic without external clamping or translation |
| Output Drive | ±24 mA at VCC = 3.0 V - Drives standard TTL loads and short PCB traces without buffering |
| Quiescent ICC | 20 µA max - Minimizes standby power in always-on communication subsystems |
| Operating Temperature | −40°C to +85°C - Qualified for industrial-grade embedded control and networking equipment |
| Input Capacitance | 7 pF typical - Reduces high-frequency loading on upstream drivers and improves signal integrity |
Pinout & Package
74LCX16646MTD is housed in a 56-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 6.1 mm wide, with 0.5 mm lead pitch and exposed thermal pad (non-electrical). Package supports automated SMT assembly and provides improved thermal dissipation over SSOP.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A7 | Side A bidirectional I/O | Connects to local bus segment; functions as input or 3-STATE output depending on DIR and OE |
| B0–B7 | Side B bidirectional I/O | Connects to remote or voltage-different bus; mirrors A-side behavior under DIR control |
| OE1, OE2 | Output Enable inputs | Active-low enables 3-STATE outputs; HIGH forces isolation regardless of DIR or clock state |
| DIR1, DIR2 | Direction Control inputs | Determines real-time flow direction: LOW = B→A, HIGH = A→B when OE is active |
| CPAB1, CPAB2 | Load-A-register clocks | LOW-to-HIGH transition latches data from A-side into A register for stored-mode use |
| CPBA1, CPBA2 | Load-B-register clocks | LOW-to-HIGH transition latches data from B-side into B register for stored-mode use |
| SAB1, SAB2 | Select-A-from-B inputs | When HIGH, routes A register contents to B-side outputs in stored mode |
| SBA1, SBA2 | Select-B-from-A inputs | When HIGH, routes B register contents to A-side outputs in stored mode |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant I/O | Operates safely with 0–5.5 V signals on all pins while powered from 2.3–3.6 V - eliminates external level translators in mixed-voltage systems |
| Dual-register architecture | Independent A and B 8-bit registers enable simultaneous capture, storage, and forwarding - critical for glitch-free bus arbitration in hot-swap applications |
| Live insertion support | Power-down high-impedance I/O and controlled power-up sequencing allow safe board insertion/removal without disrupting live backplane operation |
| EMI/noise reduction | Patented output slew-rate control and internal filtering reduce radiated emissions - simplifies EMC compliance in dense PCB layouts |
| Latch-up immunity | Exceeds 500 mA per JEDEC JESD78 - ensures robustness against transient overvoltage and ground bounce in noisy industrial environments |
Applications
| Telecom Backplane Interface | Industrial PLC I/O Module |
|---|---|
Use Scenario: Interfacing 3.3 V FPGA control logic to legacy 5 V peripheral cards in modular telecom chassis. IC Role / Device Role / Timing Role: Bidirectional voltage-translating transceiver with register staging to decouple timing domains and absorb bursty traffic. Use Value: Eliminates discrete level shifters and glue logic; 5.2 ns tPD ensures deterministic latency for time-sensitive control messaging. | Use Scenario: Isolating field-side 5 V sensor/actuator signals from 2.5 V microcontroller bus in programmable logic controller modules. IC Role / Device Role / Timing Role: Registered bus interface providing noise-immune data capture and synchronized output staging to prevent metastability. Use Value: ±24 mA drive sustains signal integrity over long ribbon cables; latch-up immunity prevents failure during ESD-prone factory maintenance. |
| Automotive Diagnostic Gateway | Test Equipment Data Mux |
Use Scenario: Aggregating multiple 5 V CAN/LIN transceiver status lines into a 3.3 V diagnostic microcontroller in vehicle gateway ECUs. IC Role / Device Role / Timing Role: Level-shifting transceiver with register hold capability to buffer intermittent diagnostic responses before CPU polling. Use Value: 5V tolerance avoids damage from battery transients; −40°C to +85°C rating meets automotive ambient requirements. | Use Scenario: Multiplexing parallel test data streams from multiple DUTs (5 V logic) onto a single 3.3 V ATE controller bus. IC Role / Device Role / Timing Role: Programmable 16-bit data router enabling real-time or stored-mode forwarding based on test sequence commands. Use Value: Dual register banks allow pre-loading next test vector while current one executes - increasing throughput by eliminating wait states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ALVC16646PAG | Higher VCC range (1.65–3.6 V); 3.5 ns tPD at 3.3 V; no 5V tolerance - requires external clamping for 5 V I/O | Best suited for pure 1.8/2.5/3.3 V systems where lowest propagation delay is critical and 5 V signals are absent | Select when speed outweighs voltage flexibility and external protection is acceptable |
| SN74LVC16646ADGGR | Same 1.65–3.6 V VCC; 5V tolerant I/O; 5.8 ns tPD at 3.3 V; TSSOP-56 pinout identical but different internal register control logic | Compatible for drop-in replacement only if SAB/SBA and CPAB/CPBA timing sequences match - verify register enable behavior in target firmware | Prefer when migrating from TI-based designs with identical pinout and need 5V tolerance at minor speed trade-off |
Compared with 74LCX16646MTD, the 74ALVC16646PAG offers faster timing but lacks 5V tolerance, requiring redesign for mixed-voltage use; the SN74LVC16646ADGGR matches I/O voltage capability and package but differs in register clock edge sensitivity and select logic timing - validation required before substitution.
Availability
74LCX16646MTD is available at Aetrix Electronics and suitable for telecom backplane interfaces, industrial PLC I/O modules, and automotive diagnostic gateways requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for 74LCX16646MTD 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 computing, and IoT applications.
The 74LCX16646MTD belongs to ON Semiconductor's legacy LCX low-voltage logic family, engineered for high-speed, low-power bidirectional bus interfacing in mixed-voltage systems where reliability and interoperability across voltage domains are essential.
FAQ
What is the maximum clock frequency supported by the 74LCX16646MTD?
The 74LCX16646MTD supports a maximum clock frequency of 170 MHz under recommended conditions (VCC = 3.3 V, CL = 50 pF, TA = −40°C to +85°C), derived from its 5.2 ns maximum propagation delay. This value assumes proper signal integrity, termination, and layout practices - actual system-level frequency may be lower due to board-level parasitics and timing margin requirements.
Does the 74LCX16646MTD require external pull-up resistors on OE pins?
Yes - to ensure high-impedance outputs during power-up or power-down transitions, OE pins must be tied to VCC via an external pull-up resistor. The minimum resistance value depends on the driving source's current-sourcing capability; Fairchild's datasheet specifies this as a design requirement (Note 1) to prevent unintended output activation before system initialization completes.
Can the 74LCX16646MTD operate with a 2.5 V supply while interfacing to 5 V signals?
Yes - the 74LCX16646MTD is explicitly rated for 5V-tolerant I/O across its full 2.3–3.6 V VCC range. At 2.5 V supply, all inputs and outputs safely accept 0–5.5 V signals without damage or functional degradation, making it ideal for bridging legacy 5 V peripherals to modern low-voltage controllers.
How does the register functionality of the 74LCX16646MTD differ from basic transceivers like the 74LCX16245?
Unlike the 74LCX16245 - which provides only real-time bidirectional pass-through - the 74LCX16646MTD integrates dual 8-bit registers (A and B) with independent clock (CPAB/CPBA) and select (SAB/SBA) controls. This enables stored-mode operation: data can be captured, held, and forwarded asynchronously, supporting buffered data staging, glitch suppression, and multi-cycle protocol handshaking not possible with non-registered transceivers.
Is the 74LCX16646MTD pin-compatible with other 56-pin TSSOP transceivers?
No - the 74LCX16646MTD has a unique pinout defined by its dual-register architecture, including dedicated CPAB/CPBA, SAB/SBA, and DIR/OE assignments per byte group. While physical package (MTD56) matches JEDEC MO-153, electrical pin functions differ from generic 16-bit transceivers such as the 74LVC16245 or 74ALVC16245, requiring schematic and layout verification before substitution.
74LCX16646MTD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCX
- Package/Case:
- 56-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 2
- 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:
- 56-TSSOP
74LCX16646MTD FAQ
1.How can I place an order for 74LCX16646MTD through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCX16646MTD 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 74LCX16646MTD reliable?
The price and inventory of 74LCX16646MTD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX16646MTD is usually 5 days.
3.What payment methods are accepted for 74LCX16646MTD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX16646MTD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCX16646MTD?
74LCX16646MTD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCX16646MTD 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 74LCX16646MTD?
For technical support, including 74LCX16646MTD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX16646MTD requirements.
6.How does Aetrix verify that 74LCX16646MTD is sourced from the original manufacturer or authorized distributors?
All 74LCX16646MTD 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 74LCX16646MTD meets industry standards.
7.What is the process for return or replacement of 74LCX16646MTD?
All 74LCX16646MTD units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX16646MTD, 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 74LCX16646MTD part is unused and in its original packaging.
Return procedure for 74LCX16646MTD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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