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Texas Instruments SN74BCT543DWR
- Part No.:
- SN74BCT543DWR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74BCT543DWR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,878
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Product details
Overview
SN74BCT543DWR from Texas Instruments is an octal transceiver IC with dual-directional 3-state latched data flow, featuring BiCMOS technology for low ICCZ (9–15 mA), 5-V supply operation, and 0°C to 70°C temperature range. It implements two independent sets of D-type latches with separate LEAB/LEBA and OEAB/OEBA controls, enabling bidirectional buffered data transfer in bus interface applications such as memory address/data multiplexing.
For engineers reviewing the SN74BCT543DWR datasheet, SN74BCT543DWR pinout, SN74BCT543DWR application, or SN74BCT543DWR equivalent, key selection considerations include its 24-pin SOIC (DW) package, 8-bit bidirectional latch architecture, 3-state output drive capability (IOL = 64 mA), and compatibility with TTL-level control inputs (VIH = 2 V, VIL = 0.8 V).
Technical Context
The SN74BCT543DWR integrates back-to-back D-latch registers per data channel, allowing independent A→B and B→A storage and output enable control via CEAB/CEBA, LEAB/LEBA, and OEAB/OEBA signals. Its BiCMOS design combines bipolar input stages for TTL compatibility and CMOS output drivers for reduced quiescent current.
Timing behavior is defined by setup/hold times (tsu = 4.5 ns, th = 1.5 ns), propagation delays (tPLH/tPHL = 2–8.8 ns), and output enable/disable transitions (tPZH/tPLZ = 1–12.3 ns), all specified at VCC = 5 V, CL = 50 pF, and TA = 25°C. All I/O ports support −0.5 V to 5.5 V input voltage range with clamp protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures robust operation across standard 5-V logic rails with margin for ripple or drop. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade industrial and computing systems without extended thermal derating. |
| Output Drive (IOL) | 64 mA - supports direct connection to multiple TTL loads or moderate-capacitance buses without external buffering. |
| Quiescent Current (ICCZ) | 9–15 mA - significantly lower than bipolar-only equivalents, reducing system power in standby states. |
| Propagation Delay | 2–8.8 ns - enables high-speed data handshaking in synchronous bus architectures up to ~100 MHz effective throughput. |
| Input Thresholds | VIH = 2 V, VIL = 0.8 V - fully compatible with standard TTL logic families for seamless integration into legacy digital systems. |
| ESD Protection | >2000 V per MIL-STD-883C Method 3015 - provides robust handling tolerance during board assembly and field service. |
Pinout & Package
SN74BCT543DWR is housed in a 24-pin plastic small-outline integrated circuit (SOIC) package (DW), measuring 15.4 mm × 7.5 mm × 2.35 mm, with 1.27-mm lead pitch and RoHS-compliant NiPdAu lead finish (MSL Level-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs | Unidirectional data inputs for A-side latch; driven by upstream source (e.g., CPU address bus). |
| 11, 13, 23 | CEAB, CEBA, LEBA | Chip-enable and latch-enable controls: CEAB must be low for A→B operation; LEBA governs B→A latch transparency. |
| 12 | GND | Power return reference for all internal logic and output drivers; requires low-impedance PCB plane connection. |
| 24 | VCC | Primary 5-V supply rail; decoupling capacitor (0.1 µF ceramic) required within 10 mm of this pin. |
| 14, 15, 16, 17, 18, 19, 20, 21 | B1–B8 Outputs | 3-state buffered outputs reflecting A-latch contents when OEAB = L and CEAB = L; drive downstream bus segments. |
| 22, 10, 9 | OEAB, LEAB, OEBA | Output-enable and latch-enable for A→B path: OEAB = L activates B outputs; LEAB = L enables A→B latch transparency. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS Process Technology | Combines TTL-compatible input thresholds with CMOS output efficiency, achieving ICCZ ≤15 mA while maintaining 64-mA sink capability. |
| Dual Independent Latch Control | Separate CE/LE/OE signals per direction allow asynchronous, non-blocking bidirectional data staging - critical for shared-bus arbitration. |
| 3-State True Outputs | Outputs enter high-impedance state when OE is high, enabling wire-OR bus topologies and preventing contention during multi-driver operation. |
| Back-to-Back Register Architecture | Each data channel includes two cascaded D-latches, permitting simultaneous capture on one side while holding/forwarding on the other - ideal for pipeline buffering. |
| MIL-STD-883C ESD Rating | Exceeds 2000 V HBM - eliminates need for external TVS diodes in most industrial handling and board-level ESD environments. |
Applications
| Memory Bus Interface | CPU Address/Data Multiplexing |
|---|---|
Use Scenario: Isolating and latching address/data signals between microprocessor and SRAM/DRAM banks during read/write cycles. IC Role / Device Role / Timing Role: Bidirectional latch transceiver managing time-multiplexed AD[0:7] bus with independent A→B (address out) and B→A (data in) control. Use Value: Eliminates need for separate octal latches and buffers; reduces component count and PCB area while preserving signal integrity at 10–20 MHz bus speeds. |
Use Scenario: Demultiplexing time-shared address/data lines on 8086/8088-based systems using ALE-driven latch enable. IC Role / Device Role / Timing Role: Synchronized latch controller accepting ALE-derived LEAB pulses to capture address bits and hold them stable during memory access. Use Value: Provides precise tsu = 4.5 ns setup margin and th = 1.5 ns hold margin relative to ALE edge - ensuring reliable address capture under worst-case timing skew. |
| Industrial PLC Backplane | Legacy ISA Bus Expansion |
Use Scenario: Interfacing modular I/O cards to central controller over parallel backplane with noise-prone long traces. IC Role / Device Role / Timing Role: Direction-controlled bus driver/latch providing galvanically isolated signal conditioning and drive strength scaling. Use Value: 64-mA output drive sustains signal levels over 30-cm 50-Ω traces; 3-state outputs prevent bus contention during hot-swap events. |
Use Scenario: Extending ISA bus signals to add-on peripheral cards requiring level translation and drive reinforcement. IC Role / Device Role / Timing Role: TTL-compatible transceiver translating between ISA slot logic and local card logic, with independent OE control per direction. Use Value: VIH/VIL thresholds match ISA specification (2.0 V/0.8 V); tPLH/tPHL ≤8.8 ns meets ISA's 100-ns maximum cycle time requirement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bidirectional latch transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT543DW | Advanced CMOS (ACT) process; higher speed (tPLH = 4.5 ns typ), lower ICCZ (2 µA), but reduced output drive (IOL = 24 mA). | Preferred for low-power, high-speed systems where bus loading is light and 5-V TTL compatibility is not required. | Select SN74ACT543DW only if system operates at <50 MHz and uses CMOS-compatible signaling; not suitable for driving legacy TTL loads. |
| 74LS645N | Bipolar LS-TTL process; slower (tPLH = 25 ns), higher ICC (35 mA), no BiCMOS power savings, but identical pinout and function. | Drop-in replacement for LS-based designs needing minimal layout change, but with higher power and thermal dissipation. | Choose 74LS645N only for legacy LS-system upgrades where SN74BCT543DWR's BiCMOS benefits are unnecessary and cost is primary. |
Compared with SN74ACT543DW and 74LS645N, the SN74BCT543DWR uniquely balances TTL compatibility, 64-mA drive strength, and sub-15-mA quiescent current - making it optimal for mixed-technology industrial bus interfaces where reliability, drive capability, and power efficiency are jointly critical.
Availability
SN74BCT543DWR is available at Aetrix Electronics and suitable for industrial control backplanes, legacy computing bus extensions, and memory interface modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for SN74BCT543DWR 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
Texas Instruments is a global semiconductor leader founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74BCT543DWR belongs to TI's BCT (Bipolar-CMOS Transceiver) logic family, engineered specifically for high-drive, low-quiescent-current bidirectional bus interfacing in commercial-grade systems operating at 5 V.
FAQ
What is the primary function of the SN74BCT543DWR in a digital system?
The SN74BCT543DWR serves as an octal bidirectional transceiver with dual independent latch registers, enabling controlled, 3-state buffered data transfer between two 8-bit buses. Its core function is to isolate, store, and forward data in either direction - for example, capturing CPU address signals on one side while driving memory address lines on the other - all within a single 24-pin SOIC package. This makes the SN74BCT543DWR especially valuable in bus multiplexing and backplane interface applications where timing control and drive strength are critical.
Does the SN74BCT543DWR support true 5-V TTL logic compatibility?
Yes, the SN74BCT543DWR guarantees full TTL compatibility through its input voltage thresholds: VIH = 2.0 V minimum and VIL = 0.8 V maximum across the 0°C to 70°C range. Its BiCMOS input stage replicates standard TTL switching behavior, allowing direct connection to 74LS, 74S, and other TTL-family devices without level-shifting circuitry. This ensures reliable interoperability in mixed-logic systems - a key reason why the SN74BCT543DWR remains widely used in legacy industrial and computing designs.
What are the absolute maximum ratings for VCC and I/O voltage on the SN74BCT543DWR?
The SN74BCT543DWR has an absolute maximum supply voltage (VCC) rating of −0.5 V to 7 V, and an absolute maximum I/O port voltage rating of −0.5 V to 5.5 V. These limits define the stress boundaries beyond which permanent damage may occur. Importantly, the device is rated for operation only within the recommended 4.5 V to 5.5 V VCC range and −0.5 V to 5.5 V I/O range - meaning that while it can survive brief excursions to 7 V on VCC, sustained operation above 5.5 V violates specifications and risks functional failure or accelerated wear-out.
Can the SN74BCT543DWR be used in both A→B and B→A data paths simultaneously?
No - the SN74BCT543DWR does not support simultaneous bidirectional data flow. Its architecture requires sequential operation: CEAB must be low to enable A→B data capture and output, while CEBA must be low to enable B→A operation. Because CEAB and CEBA are separate active-low inputs, only one direction can be enabled at a time. However, rapid toggling between directions (e.g., using handshake signals) is supported, with typical propagation delays under 9 ns - enabling efficient half-duplex bus arbitration in protocols like ISA or custom parallel interfaces.
What package type and lead finish does the SN74BCT543DWR use, and is it RoHS compliant?
The SN74BCT543DWR uses a 24-pin plastic small-outline integrated circuit (SOIC) package designated DW, with dimensions of 15.4 mm × 7.5 mm × 2.35 mm and a 1.27-mm lead pitch. Its lead finish is NiPdAu (nickel-palladium-gold), and it carries a RoHS-compliant designation per TI's packaging documentation. The device is rated MSL Level-1 (unlimited floor life), meaning it can be stored indefinitely before reflow soldering without baking - simplifying inventory management and manufacturing logistics for the SN74BCT543DWR.
SN74BCT543DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 24-SOIC (0.295", 7.50mm 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:
- 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN74BCT543DWR FAQ
1.How can I place an order for SN74BCT543DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT543DWR 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 SN74BCT543DWR reliable?
The price and inventory of SN74BCT543DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT543DWR is usually 5 days.
3.What payment methods are accepted for SN74BCT543DWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74BCT543DWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74BCT543DWR?
SN74BCT543DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT543DWR 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 SN74BCT543DWR?
For technical support, including SN74BCT543DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT543DWR requirements.
6.How does Aetrix verify that SN74BCT543DWR is sourced from the original manufacturer or authorized distributors?
All SN74BCT543DWR 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 SN74BCT543DWR meets industry standards.
7.What is the process for return or replacement of SN74BCT543DWR?
All SN74BCT543DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT543DWR, 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 SN74BCT543DWR part is unused and in its original packaging.
Return procedure for SN74BCT543DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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