My Inquiry
My Account
onsemi 74LCX16543MTD
- Part No.:
- 74LCX16543MTD
- Manufacturer:
- onsemi
- Package:
- 56-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
74LCX16543MTD.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 56TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,288
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
74LCX16543 from onsemi (formerly Fairchild Semiconductor) is a low-voltage 16-bit registered transceiver with independent A-to-B and B-to-A data paths, 5V-tolerant I/Os, 2.3–3.6V VCC operation, and 5.2 ns max propagation delay at 3.3V - used in voltage-level bridging between 3.3V logic and legacy 5V systems.
For engineers reviewing the 74LCX16543 datasheet, pinout, applications, or equivalent options, key selection considerations include bidirectional latch control per byte, ±24 mA drive strength at 3.0V, 5V-tolerant I/O compatibility, and TSSOP-56 packaging for space-constrained board interfaces.
Technical Context
The 74LCX16543 implements two independent 8-bit register-controlled transceiver blocks, each with dedicated CE, LE, and OE inputs enabling byte-selectable latching and 3-STATE output control. It supports simultaneous A→B and B→A data flow under separate control logic without bus contention.
Its CMOS-based design delivers rail-to-rail 5V-tolerant I/O operation while maintaining sub-6 ns propagation delay and <20 µA quiescent ICC at 3.3V - achieved via patented noise/EMI reduction circuitry and optimized input/output buffer staging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.3 V to 3.6 V - enables direct integration into 2.5V/3.3V logic domains without level shifters |
| I/O Voltage Tolerance | 0 V to 5.5 V - allows safe interfacing with 5V peripherals without external protection |
| tPD Max | 5.2 ns at VCC = 3.3V - supports high-speed data transfer in memory buffers and bus extenders |
| Output Drive | ±24 mA at VCC = 3.0V - drives standard TTL loads and multiple CMOS inputs directly |
| ICC Quiescent | 20 µA max - ensures ultra-low static power in battery-backed or standby-critical systems |
| Input Leakage | ±5.0 µA - minimizes signal integrity degradation in high-impedance routing or long traces |
| 3-STATE Leakage | ±5.0 µA - maintains clean bus isolation during direction switching or power-down states |
Pinout & Package
74LCX16543 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 - optimized for automated SMT assembly and thermal performance in dense PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OEABn | A-to-B Output Enable (Active LOW) | Controls 3-STATE status of B0–B15 outputs; HIGH disables outputs to high-impedance |
| OEBAn | B-to-A Output Enable (Active LOW) | Controls 3-STATE status of A0–A15 outputs; HIGH disables outputs to high-impedance |
| CEABn | A-to-B Enable (Active LOW) | Enables A-input capture and B-output driving when LOW; disables latching path otherwise |
| CEBAn | B-to-A Enable (Active LOW) | Enables B-input capture and A-output driving when LOW; disables latching path otherwise |
| LEABn | A-to-B Latch Enable (Active LOW) | Latches A0–A15 on falling edge; transparent when LOW, holds data when HIGH |
| LEBAn | B-to-A Latch Enable (Active LOW) | Latches B0–B15 on falling edge; transparent when LOW, holds data when HIGH |
| A0–A15 | Bi-directional I/O (A-side) | Serve as inputs during B→A flow, outputs during A→B flow - 5V tolerant |
| B0–B15 | Bi-directional I/O (B-side) | Serve as inputs during A→B flow, outputs during B→A flow - 5V tolerant |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant I/Os | Supports mixed-voltage system interconnect without external level translators or clamping diodes |
| Independent byte control | Two 8-bit sections allow selective latching and direction control - enables partial bus updates |
| Live insertion support | High-impedance power-up/down behavior prevents bus contention during hot-swap operations |
| Low-noise switching | Patented EMI reduction circuitry suppresses ground bounce and crosstalk in high-density layouts |
| Latch-up immunity | Exceeds 500 mA - ensures robustness against transient overvoltage events in industrial environments |
Applications
| Memory Interface Buffer | PCI Bus Extender |
|---|---|
|
Use Scenario: Isolating and buffering address/data lines between a 3.3V microcontroller and 5V SRAM or Flash memory. IC Role / Device Role / Timing Role: Registered transceiver providing synchronized, direction-controlled data transfer with latch hold capability. Use Value: Eliminates timing skew across 16-bit buses and prevents 5V back-drive damage to low-voltage controller I/Os. |
Use Scenario: Extending PCI bus signals across backplane segments operating at different supply voltages. IC Role / Device Role / Timing Role: Bidirectional registered repeater with independent enable/latch control per byte group. Use Value: Maintains signal integrity and setup/hold timing margins while enabling voltage domain translation. |
| Industrial PLC I/O Module | Legacy System Adapter Card |
|
Use Scenario: Interfacing modern 3.3V FPGA-based controllers with legacy 5V discrete I/O modules. IC Role / Device Role / Timing Role: Level-translating transceiver with latch storage for deterministic I/O sampling. Use Value: Enables deterministic read/write cycles with programmable strobe timing and bus contention avoidance. |
Use Scenario: Retrofitting ISA or VME bus cards with 3.3V logic while retaining compatibility with 5V motherboard slots. IC Role / Device Role / Timing Role: Registered interface bridge supporting hot-plug-safe initialization and direction arbitration. Use Value: Allows seamless integration without redesigning slot-level signaling or adding discrete level-shifting components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ALVC16543 | Lower VCC range (1.65–3.6V); 4.2 ns tPD max at 3.3V; same pinout and function | Higher speed and wider low-voltage margin; suitable for newer 1.8V/2.5V designs | Preferred for new designs requiring faster timing or lower VCC flexibility |
| SN74LVC16543 | TI implementation; identical electrical specs and pinout; rated for −40°C to +125°C operation | Extended temperature range; qualified for automotive under AEC-Q100 Grade 2 | Recommended where extended temp or automotive qualification is required |
Compared with 74LCX16543, the 74ALVC16543 offers improved speed and lower minimum VCC, while the SN74LVC16543 provides broader temperature coverage and automotive qualification - both retain full functional and pinout compatibility for drop-in replacement in existing layouts.
Availability
74LCX16543 is available at Aetrix Electronics and suitable for memory interface buffering, PCI bus extension, and industrial I/O module designs requiring stable component supply and long-term obsolescence management.
Supply support for 74LCX16543 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
onsemi (formerly Fairchild Semiconductor) is a global semiconductor supplier focused on energy-efficient technologies for automotive, industrial, cloud, and IoT applications.
The 74LCX16543 belongs to the LCX family of low-voltage, 5V-tolerant logic ICs designed specifically for voltage-domain bridging in mixed-supply digital systems.
FAQ
What is the recommended VCC operating range for the 74LCX16543?
The 74LCX16543 is specified for reliable operation across 2.3 V to 3.6 V VCC. Operation below 2.3 V is not guaranteed per datasheet limits, and exceeding 3.6 V risks parametric violation. The device retains 5V-tolerant I/O functionality across this full range, making it suitable for 2.5V and 3.3V system rails.
Does the 74LCX16543 support live insertion or hot-swap applications?
Yes, the 74LCX16543 supports live insertion/withdrawal per its datasheet Note 1. Its inputs and outputs enter high-impedance states during power-up/down when OE is pulled up to VCC, preventing bus contention. This behavior is confirmed by its power-down leakage specification (IOFF ≤ 10 µA at VI/VO = 5.5V).
How many independent control groups does the 74LCX16543 provide?
The 74LCX16543 provides two independent 8-bit control groups (Byte 1: A0–A7/B0–B7; Byte 2: A8–A15/B8–B15), each with dedicated CEABn/CEBAn, LEABn/LEBAn, and OEABn/OEBAn pins. These can be shorted together for full 16-bit operation or used separately for granular bus partitioning.
What is the maximum output drive capability of the 74LCX16543 at 3.0V VCC?
At VCC = 3.0V, the 74LCX16543 delivers ±24 mA per output pin, verified under IOH/IOL test conditions in the DC Electrical Characteristics table. This meets or exceeds standard TTL loading requirements and supports fan-out to multiple CMOS inputs without external buffers.
Is the 74LCX16543 pin-compatible with other 16-bit registered transceivers in the LCX family?
Yes, the 74LCX16543 shares identical pinout and package footprint with other LCX-family 16-bit transceivers including the 74LCX16245 and 74LCX16373. However, functional differences exist: the 74LCX16543 provides dual-direction latched transceivers, whereas the 74LCX16245 is non-latched and unidirectional per section.
74LCX16543MTD 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
74LCX16543MTD FAQ
1.How can I place an order for 74LCX16543MTD through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCX16543MTD 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 74LCX16543MTD reliable?
The price and inventory of 74LCX16543MTD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX16543MTD is usually 5 days.
3.What payment methods are accepted for 74LCX16543MTD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX16543MTD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCX16543MTD?
74LCX16543MTD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCX16543MTD 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 74LCX16543MTD?
For technical support, including 74LCX16543MTD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX16543MTD requirements.
6.How does Aetrix verify that 74LCX16543MTD is sourced from the original manufacturer or authorized distributors?
All 74LCX16543MTD 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 74LCX16543MTD meets industry standards.
7.What is the process for return or replacement of 74LCX16543MTD?
All 74LCX16543MTD units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX16543MTD, 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 74LCX16543MTD part is unused and in its original packaging.
Return procedure for 74LCX16543MTD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74LCX16543MTD Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
