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Texas Instruments SN74ABT543ADBRG4
- Part No.:
- SN74ABT543ADBRG4
- Manufacturer:
- Texas Instruments
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT543ADBRG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,781
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Product details
Overview
SN74ABT543ADBRG4 from Texas Instruments is an octal registered transceiver with 3-state outputs, designed for bidirectional data flow control in high-speed bus interfaces. It features dual independent latch-enable (LEAB/LEBA) and output-enable (OEAB/OEBA) controls, ±32-mA high-drive outputs, and operates from –40°C to 85°C at 4.5–5.5 V. It is used in industrial backplane and memory interface applications requiring temporary data storage and direction-controlled buffering.
For engineers reviewing the SN74ABT543ADBRG4 datasheet, SN74ABT543ADBRG4 pinout, SN74ABT543ADBRG4 application, or SN74ABT543ADBRG4 equivalent, key selection criteria include its 24-pin SSOP (DB) package, 3.5-ns minimum LE pulse width, 1.8–6.9 ns propagation delays (CL = 50 pF), and compatibility with 5-V TTL-level systems requiring latch-based bus isolation.
Technical Context
This device implements two independent 8-bit registered transceivers - A-to-B and B-to-A - each with dedicated CE, LE, and OE inputs enabling precise timing control of data latching and output enablement. Its EPIC-IIB BiCMOS process delivers low power dissipation while maintaining high drive strength (–32 mA IOH, 64 mA IOL).
It supports true 3-state output control during power-up/down via external pull-up on OE, and includes robust ESD protection (>2000 V HBM, >200 V MM). Output ground bounce (VOLP) is specified <1 V at VCC = 5 V, TA = 25°C, ensuring signal integrity in dense PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - compatible with standard 5-V TTL logic rails and tolerant of supply ripple. |
| IOH / IOL | –32 mA / 64 mA - drives heavy capacitive loads and multiple TTL inputs without external buffers. |
| Propagation Delay | 1.8–6.9 ns (CL = 50 pF) - enables operation in sub-100-MHz bus systems with tight timing margins. |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded and control applications. |
| Package | 24-pin SSOP (DB), 0.65-mm pitch - surface-mount compatible with automated assembly and moderate board density. |
| ESD Rating | >2000 V HBM - reduces risk of handling damage during manufacturing and field service. |
| Input Thresholds | VIH = 2 V, VIL = 0.8 V - fully compatible with standard TTL input logic levels. |
Pinout & Package
SN74ABT543ADBRG4 is housed in a 24-pin Shrink Small-Outline Package (SSOP, DB), 7.9 mm × 4.4 mm × 1.75 mm body, with 0.65-mm lead pitch and gull-wing leads. The package is RoHS-compliant, moisture sensitivity level 1, and rated for reflow up to 260°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LEBA) | B-to-A latch enable | Active-low control that captures B-port data into B-to-A register on rising edge; transparent when low. |
| 2 (OEBA) | B-to-A output enable | Active-low 3-state control for B-to-A outputs; must be pulled up externally for safe power sequencing. |
| 3–10 (A1–A8) | A-side data I/O | Bi-directional data terminals for A port; driven by A latches when CEAB low and OEAB low. |
| 11 (CEAB) | A-to-B chip enable | Active-low master enable for A-to-B path; must be low to allow A data capture or B output activation. |
| 12 (GND) | Ground reference | Primary return path for all digital and output current; requires low-inductance connection to minimize noise. |
| 13 (VCC) | Power supply | +5-V supply rail; bypassing with 0.1-µF ceramic capacitor near pin is mandatory for stable operation. |
| 14 (CEBA) | B-to-A chip enable | Active-low master enable for B-to-A path; decouples direction control from latch/output timing. |
| 15–22 (B1–B8) | B-side data I/O | Bi-directional data terminals for B port; reflect A-latch contents when CEAB/OEAB low. |
| 23 (LEAB) | A-to-B latch enable | Active-low control that captures A-port data into A-to-B register on rising edge; transparent when low. |
| 24 (OEAB) | A-to-B output enable | Active-low 3-state control for A-to-B outputs; enables simultaneous bus sharing with other devices. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent transceiver paths | Enables concurrent A↔B data flow control without cross-talk; each path has dedicated CE/LE/OE pins. |
| High-drive 3-state outputs | –32 mA IOH and 64 mA IOL support direct driving of 10+ TTL loads or long traces without fanout buffers. |
| Low ground bounce (VOLP) | <1 V at VCC = 5 V ensures clean signal edges and reduced crosstalk in multi-device bus environments. |
| EPIC-IIB BiCMOS process | Combines bipolar speed and CMOS low static power, reducing ICC to 30 mA max under full load. |
| Robust ESD protection | Exceeds 2000 V per MIL-STD-883 Method 3015, eliminating need for external ESD diodes in most industrial designs. |
Applications
| Industrial Backplane Interface | Memory Expansion Module |
|---|---|
Use Scenario: Bidirectional data transfer between CPU module and peripheral expansion cards across a shared 8-bit parallel bus. IC Role / Device Role / Timing Role: Registered transceiver providing latch-synchronized handshaking and 3-state isolation between modules. Use Value: Prevents bus contention during hot-swap events and ensures setup/hold compliance with 3.5-ns LE pulse width and 0.5-ns hold time. | Use Scenario: Interfacing SRAM or Flash memory banks to a microcontroller with limited address/data pins. IC Role / Device Role / Timing Role: Direction-controlled data buffer with temporary storage to align memory read/write cycles with controller timing. Use Value: Enables use of single 8-bit data bus for both address latching and data transfer, reducing PCB trace count by 50%. |
| Programmable Logic Controller (PLC) I/O Hub | Legacy System Bus Extender |
Use Scenario: Aggregating discrete sensor/actuator signals into a centralized control bus within an industrial PLC rack. IC Role / Device Role / Timing Role: Registered transceiver managing time-critical I/O sampling and command distribution with deterministic latency. Use Value: Guarantees 6.9-ns max propagation delay and 0.5-ns hold time for real-time response in sub-1-ms control loops. | Use Scenario: Bridging legacy 5-V parallel peripherals (e.g., printers, scanners) to modern embedded hosts with isolated bus domains. IC Role / Device Role / Timing Role: Level-shifting, direction-controlled bus isolator with latch-based handshake synchronization. Use Value: Eliminates need for discrete logic glue; supports seamless integration via CE/LE/OE timing flexibility and 5-V TTL compatibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245DBR | Octal bus transceiver (non-registered); no internal latches; only OE-controlled 3-state outputs. | Suitable for simple direction-controlled data pass-through, not for latch-synchronized handshaking or pipeline staging. | Select SN74ABT245DBR only if latching functionality is unnecessary and lower propagation delay (1.5–5.5 ns) is prioritized. |
| SN74LVC245APWR | 3.3-V CMOS octal transceiver; lower drive (±24 mA); no latch registers; different voltage domain and timing specs. | Designed for 3.3-V systems; incompatible with 5-V TTL signaling without level translation. | Choose SN74LVC245APWR only in new 3.3-V designs where power efficiency and smaller TSSOP-24 package are critical. |
Compared with SN74ABT245DBR and SN74LVC245APWR, SN74ABT543ADBRG4 uniquely provides dual-path registered latching for synchronous bus arbitration - essential for applications requiring data capture alignment, such as memory-mapped I/O or backplane handshaking - while maintaining full 5-V TTL compatibility and industrial temperature range.
Availability
SN74ABT543ADBRG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory expansion modules, PLC I/O hubs, and legacy system bus extenders requiring stable component supply and long-term production continuity.
Supply support for SN74ABT543ADBRG4 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 specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
SN74ABT543ADBRG4 belongs to the ABT logic family, engineered for high-speed, high-drive 5-V TTL-compatible bus interfacing with integrated latching and robust noise immunity in harsh environments.
FAQ
What is the function of the CEAB and CEBA pins on the SN74ABT543ADBRG4?
The CEAB (Chip Enable A-to-B) and CEBA (Chip Enable B-to-A) pins are active-low master enables for their respective data paths. CEAB must be low to allow A-port data capture into the A-to-B latches or to activate B-port outputs; CEBA performs the same function for the B-to-A direction. Both pins decouple chip-level enablement from latch and output timing, enabling flexible bus arbitration schemes in the SN74ABT543ADBRG4.
Does the SN74ABT543ADBRG4 support hot-swap or live-insertion applications?
Yes - the SN74ABT543ADBRG4 supports controlled hot-swap operation when OEAB and OEBA are tied to VCC via appropriate pull-up resistors (minimum value determined by driver sink capability). This ensures outputs remain in high-impedance state during power-up/down transitions, preventing bus contention. Its robust ESD rating (>2000 V HBM) further enhances reliability in field-replaceable module designs using the SN74ABT543ADBRG4.
What is the maximum capacitive load the SN74ABT543ADBRG4 can drive reliably?
The SN74ABT543ADBRG4 is characterized for CL = 50 pF in timing specifications, but its ±32-mA/64-mA drive strength supports heavier loads. At VCC = 5 V and TA = 25°C, it maintains VOL ≤ 0.55 V with 64-mA sink current, indicating reliable operation into ≥100 pF with marginal timing impact. For loads exceeding 50 pF, verify setup/hold margins using worst-case propagation delays (up to 6.9 ns) and ensure adequate power supply decoupling for the SN74ABT543ADBRG4.
Can the SN74ABT543ADBRG4 operate at 3.3 V?
No - the SN74ABT543ADBRG4 is specified only for VCC = 4.5 V to 5.5 V and is not guaranteed functional below 4.5 V. Its input thresholds (VIH = 2 V, VIL = 0.8 V) and output drive characteristics are optimized for 5-V TTL systems. For 3.3-V applications, consider pin-compatible alternatives like SN74LVC245APWR, but note they lack internal latches and require external clocking for registered behavior - a key functional distinction from the SN74ABT543ADBRG4.
How does the SN74ABT543ADBRG4 handle power sequencing in multi-rail systems?
The SN74ABT543ADBRG4 requires OEAB and OEBA to be held high (via pull-up resistors to VCC) during power-up/down to guarantee 3-state outputs before internal logic stabilizes. Its absolute maximum rating allows VCC as low as –0.5 V, but recommended operation begins only after VCC reaches 4.5 V. No special sequencing with other rails is required, provided OE is properly biased - a design requirement explicitly called out in the SN74ABT543ADBRG4 datasheet to prevent undefined output states.
SN74ABT543ADBRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
SN74ABT543ADBRG4 FAQ
1.How can I place an order for SN74ABT543ADBRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT543ADBRG4 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 SN74ABT543ADBRG4 reliable?
The price and inventory of SN74ABT543ADBRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT543ADBRG4 is usually 5 days.
3.What payment methods are accepted for SN74ABT543ADBRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT543ADBRG4 transactions.
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4.How is shipping managed for SN74ABT543ADBRG4?
SN74ABT543ADBRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT543ADBRG4 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 SN74ABT543ADBRG4?
For technical support, including SN74ABT543ADBRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT543ADBRG4 requirements.
6.How does Aetrix verify that SN74ABT543ADBRG4 is sourced from the original manufacturer or authorized distributors?
All SN74ABT543ADBRG4 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 SN74ABT543ADBRG4 meets industry standards.
7.What is the process for return or replacement of SN74ABT543ADBRG4?
All SN74ABT543ADBRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT543ADBRG4, 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 SN74ABT543ADBRG4 part is unused and in its original packaging.
Return procedure for SN74ABT543ADBRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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