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NXP Semiconductors 74LVC543APW,118
- Part No.:
- 74LVC543APW,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74LVC543APW,118.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,884
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Product details
Overview
74LVC543APW,118 from NXP Semiconductors (formerly Philips) is an octal D-type registered transceiver with dual-direction 3-state bus interface capability, operating from 1.2 V to 3.6 V supply, featuring 5 V tolerant I/O, propagation delay of 3.0 ns (typ. at VCC = 3.3 V, CL = 50 pF), and −40 °C to +125 °C temperature range. It enables bidirectional data latching and buffering in high-density memory or peripheral bus systems.
For engineers reviewing the 74LVC543APW,118 datasheet, 74LVC543APW,118 pinout, 74LVC543APW,118 application, or 74LVC543APW,118 equivalent, key selection criteria include its dual-latch architecture, independent A→B and B→A enable/control logic, 5 V tolerance for mixed-voltage interfacing, and TSSOP24 package suitability for space-constrained PCB layouts.
Technical Context
The 74LVC543APW,118 implements two independent sets of D-type latches-one for A-to-B and one for B-to-A data flow-each with dedicated latch enable (LEAB/LEBA) and output enable (OEAB/OEBA) inputs. This allows simultaneous or asynchronous registration and 3-state control per direction without cross-interference.
Its CMOS Si-gate design ensures low dynamic power dissipation (CPD = 15.0 pF per latch with outputs enabled at VCC = 3.3 V) and high-impedance shutdown when VCC = 0 V. Input/output capacitance is specified at 4.0 pF (CI) and 5.0 pF (CI/O), supporting fast edge rates (tr/tf ≤2.5 ns) and stable operation up to 3.6 V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.2 V to 3.6 V - supports low-voltage core logic while maintaining compatibility with 3.3 V I/O domains |
| Propagation Delay (An↔Bn) | 3.0 ns typical at VCC = 3.3 V, CL = 50 pF - enables high-speed bidirectional bus timing in 100+ MHz systems |
| I/O Voltage Tolerance | 5.5 V max input/output voltage - permits direct connection to legacy 5 V TTL buses without level-shifting circuitry |
| Operating Temperature | −40 °C to +125 °C - qualified for automotive under-hood and industrial control environments |
| Output Drive Strength | ±24 mA sink/source at VCC = 3.0 V - sufficient to drive multiple LVC loads or moderate capacitive bus traces |
| 3-State Enable/Disable Time | tPZH/tPLZ = 3.2 ns typical at VCC = 3.3 V - minimizes bus contention windows during direction switching |
| Input Leakage Current | ±0.1 µA max at VI = 5.5 V or GND - ensures minimal standby current impact in battery-backed or low-power systems |
Pinout & Package
TSSOP24 plastic package (SOT355-1), 24-pin thin shrink small outline, body width 4.4 mm, lead pitch 0.65 mm, exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | LEBA | B-to-A latch enable (active LOW) - controls transparency/storage of B→A data path independently |
| 2 | OEBA | B-to-A output enable (active LOW) - places B-side outputs in high-impedance state when HIGH |
| 3–10 | A0–A7 | A-side bidirectional data terminals - serve as inputs when data flows B→A, outputs when A→B |
| 11 | EAB | A-to-B enable (active LOW) - activates A→B data path; must be LOW for A→B register operation |
| 12 | GND | Ground reference - common return for all internal logic and I/O circuits |
| 13 | OEAB | A-to-B output enable (active LOW) - disables A→B outputs into high-impedance mode |
| 14 | LEAB | A-to-B latch enable (active LOW) - captures A-side data on rising edge; enables transparent mode when LOW |
| 15–22 | B7–B0 | B-side bidirectional data terminals - function as outputs during A→B transfer, inputs during B→A transfer |
| 23 | EBA | B-to-A enable (active LOW) - activates B→A data path; required LOW for B→A register operation |
| 24 | VCC | Positive supply - powers all internal logic and output drivers; high-impedance state maintained even at VCC = 0 V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent latch paths | Separate LEAB/OEAB and LEBA/OEBA controls allow concurrent A→B and B→A data registration without arbitration logic |
| 5 V tolerant I/O | Supports direct interface with 5 V TTL or LVTTL buses while powered from 1.2–3.6 V supplies - eliminates external level shifters |
| Back-to-back register architecture | Enables pipeline-style data staging: one register captures incoming data while the other drives outgoing data on same clock edge |
| High-impedance on power loss | Outputs enter high-Z state when VCC = 0 V - prevents back-driving of powered subsystems during hot-swap or brownout conditions |
| JEDEC JESD8-B/JESD36 compliance | Guarantees interoperability with industry-standard low-voltage CMOS logic families across voltage and timing margins |
Applications
| Memory Expansion Interface | Peripheral Bus Isolation |
|---|---|
Use Scenario: Connecting a 32-bit microcontroller data bus to external SRAM or Flash memory with separate address/data multiplexing. IC Role / Device Role / Timing Role: Bidirectional registered transceiver that latches address/data during bus turnaround, isolating controller and memory timing domains. Use Value: Eliminates need for discrete latches and bus buffers; 3.0 ns propagation delay supports >100 MHz bus cycles with setup/hold margin. |
Use Scenario: Isolating a USB or UART peripheral from a main system bus during firmware updates or fault recovery. IC Role / Device Role / Timing Role: Direction-controlled 3-state buffer enabling clean bus disconnection without signal contention. Use Value: Independent OEAB/OEBA control allows selective disabling of one direction while maintaining communication in the other. |
| Multi-Processor Shared Memory | Mixed-Voltage System Interfacing |
Use Scenario: Enabling two ARM Cortex-M processors to share a common SRAM bank via time-multiplexed access. IC Role / Device Role / Timing Role: Registered transceiver acting as synchronized bus switch with latch-enable synchronization between processors. Use Value: Back-to-back latches prevent metastability during cross-processor handshaking; tsk(0) skew ≤1.0 ns ensures coherent data capture. |
Use Scenario: Interfacing a 1.8 V FPGA I/O bank to a 3.3 V sensor hub or display controller. IC Role / Device Role / Timing Role: Level-tolerant bidirectional bridge that accepts 5 V inputs while driving 3.3 V outputs. Use Value: 5.5 V absolute max I/O rating allows safe operation with 5 V peripherals; no external clamping diodes required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC823APWR | Single-direction 8-bit latch with 3-state outputs; lacks B→A path and independent OE/LE per direction | Suitable only for unidirectional data latching; requires two devices for full bidirectional operation | Select when only A→B registration is needed and board area permits dual-package implementation |
| 74ALVC162245DGGR | 16-bit, non-latched, 3-state transceiver; no internal registers; higher drive (±24 mA), wider VCC range (1.65–3.6 V) | Used for simple bus buffering without storage; cannot hold data during bus arbitration or clock domain crossing | Prefer for high-throughput streaming where latency matters more than data retention across clock edges |
Compared with SN74LVC823APWR and 74ALVC162245DGGR, the 74LVC543APW,118 uniquely integrates dual-path latching and independent directional control in a single TSSOP24 package-reducing component count and interconnect complexity in bidirectional memory or multi-master bus designs.
Availability
74LVC543APW,118 is available at Aetrix Electronics and suitable for memory expansion interfaces, peripheral isolation circuits, multi-processor shared-bus architectures, and mixed-voltage system interfacing requiring stable component supply across extended temperature ranges.
Supply support for 74LVC543APW,118 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
NXP Semiconductors, formerly Philips Semiconductors, is a global leader in high-performance analog and logic ICs, with expertise in automotive, industrial, and consumer semiconductor solutions.
The 74LVC543APW,118 belongs to the LVC (Low-Voltage CMOS) logic family, designed specifically for low-power, high-speed bidirectional bus interfacing in portable, automotive, and industrial systems operating below 3.6 V.
FAQ
What is the maximum operating frequency supported by the 74LVC543APW,118?
The 74LVC543APW,118 does not specify a maximum clock frequency directly, but its 3.0 ns typical propagation delay (An↔Bn at VCC = 3.3 V, CL = 50 pF) supports reliable operation in systems with bus cycle times ≥7 ns. Real-world maximum frequency depends on layout, load capacitance, and timing margins-designers commonly achieve stable operation up to 100–125 MHz in well-terminated 3.3 V systems using the 74LVC543APW,118.
Can the 74LVC543APW,118 operate with a 1.8 V supply?
Yes, the 74LVC543APW,118 is fully specified for operation from 1.2 V to 3.6 V. At VCC = 1.8 V, DC parameters such as VIH (min 1.2 V), VIL (max 0 V), and VOH/VOL remain valid, and AC performance degrades predictably-propagation delay increases to ≤15 ns (max at Tamb = −40 °C to +85 °C). The 74LVC543APW,118 maintains full functionality and 5 V tolerance across this range.
Does the 74LVC543APW,118 require external pull-up or pull-down resistors on control pins?
No, the 74LVC543APW,118 has no internal weak pull-ups or pull-downs on LEAB, LEBA, OEAB, OEBA, EAB, or EBA. These inputs are CMOS-compatible and must be actively driven to defined HIGH or LOW states. Leaving them floating may cause undefined output behavior or increased ICC due to input stage oscillation. External termination is required only if system-level noise immunity or default-state safety is needed.
How does the 74LVC543APW,118 handle bus contention during direction switching?
The 74LVC543APW,118 minimizes bus contention through independent 3-state control: OEAB and OEBA can be asserted (LOW) simultaneously to disable both output banks before changing direction, and tPZH/tPLZ (3.2 ns typical) ensures rapid high-impedance entry. Its function table explicitly defines "Disabled" and "Disabled plus latch" modes, allowing designers to sequence EAB/EBA and OEAB/OEBA to guarantee zero-output-drive overlap during transitions.
Is the exposed pad on the TSSOP24 package of the 74LVC543APW,118 electrically connected?
No, the exposed die pad in the TSSOP24 package (SOT355-1) of the 74LVC543APW,118 is mechanically attached to the die substrate using conductive die attach material but is not electrically connected to any internal node-including GND or VCC. It must not be soldered to a ground plane or used as a thermal pad without verifying isolation; NXP documentation explicitly states it "cannot be used as a supply pin or input."
74LVC543APW,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74LVC
- 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:
- 1.2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
74LVC543APW,118 FAQ
1.How can I place an order for 74LVC543APW,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVC543APW,118 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 74LVC543APW,118 reliable?
The price and inventory of 74LVC543APW,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVC543APW,118 is usually 5 days.
3.What payment methods are accepted for 74LVC543APW,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVC543APW,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVC543APW,118?
74LVC543APW,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVC543APW,118 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 74LVC543APW,118?
For technical support, including 74LVC543APW,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVC543APW,118 requirements.
6.How does Aetrix verify that 74LVC543APW,118 is sourced from the original manufacturer or authorized distributors?
All 74LVC543APW,118 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 74LVC543APW,118 meets industry standards.
7.What is the process for return or replacement of 74LVC543APW,118?
All 74LVC543APW,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74LVC543APW,118, 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 74LVC543APW,118 part is unused and in its original packaging.
Return procedure for 74LVC543APW,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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