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Texas Instruments SN74BCT543DW
- Part No.:
- SN74BCT543DW
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74BCT543DW.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,800
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Product details
Overview
SN74BCT543DW from Texas Instruments is an octal transceiver IC with dual-directional 3-state latched data flow, BiCMOS logic architecture, 24-pin SOIC (DW) package, 0°C to 70°C operating temperature, and 5 V nominal supply voltage. It enables bidirectional buffered data transfer in bus interface applications such as microprocessor system address/data buses.
For engineers reviewing the SN74BCT543DW datasheet, SN74BCT543DW pinout, SN74BCT543DW application, or SN74BCT543DW equivalent, key selection criteria include latch-enable independence per direction, 3-state output control timing (tPLH/tPHL ≤ 8.8 ns), low ICCZ standby current (9–15 mA), and SOIC-24 thermal and layout compatibility.
Technical Context
The SN74BCT543DW implements two independent sets of D-type latches-one for A-to-B and one for B-to-A data paths-each with dedicated latch-enable (LEAB/LEBA) and output-enable (OEAB/OEBA) controls. Its BiCMOS design reduces ICCZ while maintaining TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and driving capability (IOL = 64 mA).
Directional data flow requires both CEAB (A→B) and CEBA (B→A) enable inputs to be asserted low; transparency vs. storage mode is controlled by LEAB/LEBA edge transitions. Output timing is characterized under CL = 50 pF, R1/R2 = 500 Ω, and VCC = 4.5–5.5 V across 0°C to 70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL/CMOS systems without level-shifting. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded and industrial control applications. |
| Output Drive (IOL) | 64 mA - supports direct fan-out to multiple TTL loads without external buffers. |
| Propagation Delay (tPLH/tPHL) | ≤ 8.8 ns - enables high-speed bus interfacing up to ~100 MHz clock-equivalent data rates. |
| ICCZ Standby Current | 9–15 mA - BiCMOS optimization reduces power during 3-state hold, critical for low-idle-power systems. |
| Input Clamp Protection | −18 mA - safeguards against transient overvoltage on control inputs per MIL-STD-883C. |
| ESD Rating | > 2000 V HBM - meets industrial handling robustness requirements without external protection. |
Pinout & Package
SN74BCT543DW is housed in a 24-pin plastic small-outline integrated circuit (SOIC) package (DW), 300-mil width, RoHS-compliant NiPdAu lead finish, MSL Level-1, and tube packaging (25 units per tube).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs/Outputs | Port A bidirectional I/O pins; driven by A latches when CEAB/CEBA active and OEAB/OEBA enabled. |
| 9–12, 23, 24 | LEBA, OEBA, CEAB, CEBA, LEAB, OEAB | Dedicated control inputs per direction - enables independent A↔B latch and output gating without shared logic. |
| 13, 14 | VCC, GND | Single 5 V supply and ground reference; decoupling required within 1 cm due to fast switching transients. |
| 15–22 | B1–B8 Inputs/Outputs | Port B bidirectional I/O pins; reflect A-latch data when CEAB+OEAB low, or drive A latches when CEBA+OEBA low. |
Key Features
| Feature | Design Value |
|---|---|
| Back-to-back D-latch architecture | Enables simultaneous capture and hold of A→B and B→A data streams, eliminating bus contention in full-duplex memory or peripheral interfaces. |
| Independent directional control | Separate LEAB/OEAB/CEAB and LEBA/OEBA/CEBA inputs allow asymmetric data flow scheduling - e.g., A→B streaming while B→A remains latched. |
| BiCMOS process technology | Reduces ICCZ by >40% versus bipolar-only equivalents, lowering thermal load in dense PCB layouts with multiple transceivers. |
| 3-state true outputs | High-impedance state eliminates bus loading during idle cycles, enabling multi-drop parallel bus topologies without external isolation. |
| TTL-compatible input thresholds | VIH = 2 V / VIL = 0.8 V ensures reliable interfacing with legacy 5 V microcontrollers, FPGAs, and ASICs without level translation. |
Applications
| Microprocessor System Bus Interface | Industrial PLC Backplane Data Link |
|---|---|
|
Use Scenario: Bidirectional address/data multiplexing between CPU and memory or peripheral controllers on a shared 8-bit bus. IC Role / Device Role / Timing Role: Acts as a directionally gated latch-transceiver, isolating A-side (CPU) and B-side (memory) during read/write cycles with precise LEAB/OEAB timing control. Use Value: Eliminates need for separate octal buffers and latches; tPLH ≤ 8.8 ns ensures setup/hold compliance with 8086/8088-derived timing budgets. |
Use Scenario: Real-time I/O data exchange between central controller and distributed I/O modules over a ruggedized parallel backplane. IC Role / Device Role / Timing Role: Provides ESD-hardened, latch-stabilized data handshaking with independent CEBA/LEBA control for module-initiated uploads. Use Value: >2000 V HBM ESD rating and −0.5 V to 5.5 V I/O tolerance withstand industrial noise; 64 mA drive sustains signal integrity over 30 cm ribbon cables. |
| Legacy Peripheral Expansion Card | Test Equipment Digital Pattern Generator |
|
Use Scenario: Adding ISA-compatible expansion slots to modern embedded hosts via bridge logic. IC Role / Device Role / Timing Role: Buffers and latches ISA bus AD[7:0] lines with CEAB/CEBA arbitration to prevent bus conflicts during DMA or interrupt service. Use Value: Pin-compatible with industry-standard ISA transceiver footprints; DW package fits legacy 0.3″ pitch card edge connectors. |
Use Scenario: Generating synchronized 8-bit stimulus patterns for DUT testing with programmable direction reversal. IC Role / Device Role / Timing Role: Stores pattern words in A or B latches and drives them out under software-controlled LEAB/LEBA edges for glitch-free waveform edges. Use Value: Sub-10 ns propagation delay enables <100 ns pattern step resolution; 3-state outputs allow dynamic bus sharing with other test resources. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT543DW | AC-family CMOS; higher speed (tPLH ≤ 6.5 ns), lower ICCZ (2 µA), but only 4.5–5.5 V operation and no BiCMOS drive strength. | Preferred for ultra-low-power, high-speed digital test fixtures where 64 mA drive is unnecessary. | Select when minimizing static power dominates over drive capability and industrial noise immunity. |
| 74LS543N | Bipolar TTL; slower (tPLH ≤ 25 ns), higher ICCZ (60 mA), wider temp range (0°C to 70°C same), but no BiCMOS ESD or latch independence. | Suitable for cost-sensitive, non-noisy lab equipment where timing slack exists and legacy LS footprint is mandatory. | Choose only if backward compatibility with 74LS-series board layouts is required and speed/power trade-offs are acceptable. |
Compared with SN74ACT543DW and 74LS543N, the SN74BCT543DW uniquely balances 64 mA drive, sub-9 ns timing, and >2000 V ESD in a single SOIC-24 package - making it optimal for noise-prone industrial bus interfaces requiring both robustness and speed.
Availability
SN74BCT543DW is available at Aetrix Electronics and suitable for microprocessor bus interfacing, industrial PLC backplanes, legacy expansion cards, and digital test equipment requiring stable component supply and long-term obsolescence management.
Supply support for SN74BCT543DW 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 SN74BCT543DW belongs to TI's BCT (Bipolar-CMOS Transceiver) logic family, designed specifically for high-drive, noise-immune bidirectional bus interfacing in commercial and industrial systems operating at 5 V.
FAQ
What is the maximum clock-equivalent data rate supported by the SN74BCT543DW?
The SN74BCT543DW has a maximum propagation delay of 8.8 ns (tPLH/tPHL) under loaded conditions (CL = 50 pF). This supports reliable data handshaking at effective rates up to ~100 MHz in synchronous bus applications, assuming adequate setup/hold margins. The SN74BCT543DW does not include internal clock circuitry - timing is governed by external LEAB/LEBA edges and system-level control logic.
Does the SN74BCT543DW support hot-swap or live-insertion on a powered bus?
No, the SN74BCT543DW is not hot-swap rated. Its absolute maximum ratings specify VI/O = −0.5 V to 5.5 V only when VCC is powered and stable. Applying signals to A/B ports before VCC ramp-up may exceed input clamp limits or cause latch-up. For hot-swap applications, external protection circuitry or purpose-built hot-swap transceivers are required. The SN74BCT543DW must be powered before asserting any control or data signals.
Can the SN74BCT543DW operate with a 3.3 V supply?
No, the SN74BCT543DW is specified only for 4.5 V to 5.5 V supply operation. At 3.3 V, VIH/VIL thresholds become noncompliant (VIH min = 2 V, but TTL-compatible recognition degrades), output drive collapses (<10 mA), and timing parameters are unguaranteed. For 3.3 V systems, consider TI's SN74LVC543 or SN74ALVC543 - not drop-in replacements for the SN74BCT543DW.
How does the SN74BCT543DW handle bus contention between A and B ports?
The SN74BCT543DW prevents bus contention through strict directional enable logic: CEAB must be low for A→B flow, and CEBA low for B→A flow - they cannot be simultaneously active. Additionally, OEAB and OEBA independently disable outputs into high-impedance states. When both CEAB and CEBA are high, all A/B I/Os enter high-Z, eliminating contention risk. This behavior is hardwired in silicon and requires no external arbitration logic.
Is the SN74BCT543DW pin-compatible with the SN74LS543 or SN74ALS543?
Yes, the SN74BCT543DW shares identical pinout, function mapping, and 24-pin SOIC (DW) footprint with SN74LS543 and SN74ALS543. All three devices use the same LEAB/OEAB/CEAB/LEBA/OEBA/CEBA control scheme and A1–A8/B1–B8 I/O arrangement. However, electrical characteristics differ significantly - especially drive strength, speed, and power - so direct substitution requires validation of timing and loading in the target application.
SN74BCT543DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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
SN74BCT543DW FAQ
1.How can I place an order for SN74BCT543DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT543DW 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 SN74BCT543DW reliable?
The price and inventory of SN74BCT543DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT543DW is usually 5 days.
3.What payment methods are accepted for SN74BCT543DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74BCT543DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74BCT543DW?
SN74BCT543DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT543DW 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 SN74BCT543DW?
For technical support, including SN74BCT543DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT543DW requirements.
6.How does Aetrix verify that SN74BCT543DW is sourced from the original manufacturer or authorized distributors?
All SN74BCT543DW 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 SN74BCT543DW meets industry standards.
7.What is the process for return or replacement of SN74BCT543DW?
All SN74BCT543DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT543DW, 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 SN74BCT543DW part is unused and in its original packaging.
Return procedure for SN74BCT543DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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