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Texas Instruments SN74F543DWG4
- Part No.:
- SN74F543DWG4
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74F543DWG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,752
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Product details
Overview
SN74F543DWG4 from Texas Instruments is an octal registered transceiver with 3-state outputs, implementing dual-directional data flow control via independent A-to-B and B-to-A latch-enable and output-enable inputs. It features A-side outputs rated for 24 mA sink current and B-side outputs rated for 64 mA sink current, operates over 0°C to 70°C, and is used in bus interface and data buffering applications in legacy TTL-based industrial control systems.
For engineers reviewing the SN74F543DWG4 datasheet, SN74F543DWG4 pinout, SN74F543DWG4 application, or SN74F543DWG4 equivalent, key selection criteria include bidirectional latch timing (tPLH/tPHL ≤ 12.5 ns), 3-state output drive capability per port, VCC = 4.5–5.5 V operation, and SOIC-24 package compatibility with legacy board layouts.
Technical Context
The SN74F543DWG4 integrates two independent sets of D-type latches - one for A-to-B and one for B-to-A data paths - each controlled by dedicated CE, LE, and OE signals. Its logic supports transparent latch mode (LE low) followed by storage (LE rising edge), enabling synchronized bidirectional data capture.
It uses standard F-series TTL electrical characteristics: VIH = 2 V min, VIL = 0.8 V max, VOL = 0.55 V max at IOL = 64 mA (B-side), and ICCZ = 83–125 mA in 3-state high-impedance mode. Timing parameters are specified across full temperature and voltage ranges, with tSU/th = 3.5 ns min/max at VCC = 4.5–5.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with 5 V TTL bus systems and tolerates supply ripple without functional failure. |
| IOL (A-side) | 24 mA - supports driving standard TTL loads on A-port lines without external buffers. |
| IOL (B-side) | 64 mA - enables direct interfacing with higher-current peripherals such as LED drivers or legacy bus terminations. |
| tPLH / tPHL | ≤ 12.5 ns - guarantees sub-13 ns propagation delay for both A↔B directions under worst-case conditions, critical for synchronous bus timing. |
| Operating Temp | 0°C to 70°C - validated for commercial-grade industrial equipment environments, not extended or automotive temperature ranges. |
| Logic Family | F-series TTL - provides known noise margins, input thresholds, and fanout behavior consistent with 74F design practices. |
| 3-State Enable | Separate OEAB/OEBA per direction - allows independent tri-state control of A and B ports, preventing bus contention during mixed-direction transfers. |
Pinout & Package
SN74F543DWG4 is housed in a 24-pin SOIC (DW) package with 300-mil width, gull-wing leads, and JEDEC MS-013 compliant dimensions (15.4 mm × 7.5 mm body, 2.65 mm height). Pin 1 is located at top-left corner with notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LEBA) | B-to-A latch enable | Active-low control: when low, makes B→A latches transparent; rising edge stores data from B inputs. |
| 2 (OEBA) | B-to-A output enable | Active-low: enables B-port outputs to drive A-bus when CEBA and OEBA both low. |
| 3–10 (A1–A8) | A-side I/O terminals | Bi-directional data lines for A bus; driven by A latches or present as inputs depending on CEAB/CEBA state. |
| 11 (CEAB) | A-to-B chip enable | Active-low master enable: must be low for A→B data capture or B-output activation. |
| 12 (GND) | Ground reference | Primary power return path for all internal logic and output drivers; requires low-impedance PCB connection. |
| 13 (VCC) | Supply voltage | +5 V nominal power rail; decoupling capacitor (0.1 µF ceramic) required near pin for noise suppression. |
| 14 (CEBA) | B-to-A chip enable | Active-low master enable: must be low for B→A data capture or A-output activation. |
| 15–22 (B1–B8) | B-side I/O terminals | Bi-directional data lines for B bus; driven by B latches or present as inputs depending on CEBA/CEAB state. |
| 23 (LEAB) | A-to-B latch enable | Active-low control: when low, makes A→B latches transparent; rising edge stores data from A inputs. |
| 24 (OEAB) | A-to-B output enable | Active-low: enables A-port outputs to drive B-bus when CEAB and OEAB both low. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent register paths | Separate A↔B and B↔A control logic eliminates need for external gating or sequencing logic in bidirectional bus interfaces. |
| Asymmetric output drive strength | B-side 64 mA sink vs. A-side 24 mA sink allows optimized driver matching - e.g., B port drives heavier loads like backplane stubs while A port handles local logic. |
| True 3-state outputs | Outputs enter high-impedance state within ≤10 ns (tPZH/tPLZ) after OE assertion, minimizing bus contention windows in multi-drop systems. |
| Back-to-back latch architecture | Enables pipeline-style data staging: one register captures new data while the other holds previously latched values for concurrent read/write operations. |
| F-series TTL compatibility | Guaranteed VIH/VIL thresholds and AC/DC specs ensure drop-in replacement for existing 74F543 designs without signal integrity or timing recalculations. |
Applications
| Industrial Backplane Interface | Legacy CPU Bus Extender |
|---|---|
Use Scenario: Interfacing a microcontroller unit (MCU) to a parallel I/O expansion backplane with shared address/data lines. IC Role / Device Role / Timing Role: Bidirectional data buffer and latch controller managing time-multiplexed A/B bus segments with independent enable sequencing. Use Value: Eliminates need for discrete latch + tristate buffer combinations, reducing component count and PCB area while preserving strict 74F timing compliance. | Use Scenario: Extending Z80 or 8085 CPU data/address bus to peripheral cards in vintage test equipment or programmable logic controllers. IC Role / Device Role / Timing Role: Registered transceiver providing synchronized, glitch-free data handoff between CPU and peripheral modules using CE/LE/OE handshaking. Use Value: Matches original system's 74F timing budget (tSU/th ≤ 3.5 ns) and drive strength, ensuring reliable operation without redesigning timing-critical control logic. |
| Programmable Logic Data Router | TTL-Level Bus Arbitration Node |
Use Scenario: Routing data between multiple FPGA I/O banks and legacy TTL peripherals in hybrid digital systems. IC Role / Device Role / Timing Role: Direction-controlled data conduit with latch storage, enabling FPGA firmware to stage data before committing to external bus cycles. Use Value: Provides deterministic setup/hold timing (3.5 ns) and 64 mA B-side drive for driving long traces or multiple TTL inputs without signal degradation. | Use Scenario: Managing shared data bus access among three or more TTL-based subsystems (e.g., ADC, DAC, memory) in real-time control hardware. IC Role / Device Role / Timing Role: Bus transceiver with independent OE controls per direction, allowing dynamic arbitration of A- and B-bus segments without contention. Use Value: Prevents bus collisions via separate OEAB/OEBA control, and its 0.55 V VOL at 64 mA ensures noise margin retention even under heavy loading. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F543DWR | Same die, identical pinout and specs; differs only in tape-and-reel packaging (2000 pcs/reel vs. tube for DWG4). | No functional difference; suitable for automated SMT assembly where reel format is required. | Select SN74F543DWR for pick-and-place production; SN74F543DWG4 remains valid for manual prototyping or low-volume repair. |
| SN74LS543N | LS-family variant: lower speed (tPLH ≤ 25 ns), reduced IOL (B-side = 24 mA), higher VIH (2.3 V min), and higher power consumption (ICCZ ≈ 20 mA). | Compatible in static logic but unsuitable for timing-critical paths requiring <13 ns propagation or >24 mA B-side drive. | Choose SN74LS543N only if system timing budget allows ≥25 ns delays and load requirements are ≤24 mA per B output. |
Compared with SN74F543DWR (identical functionality, reel-packaged) and SN74LS543N (slower, lower-drive LS variant), SN74F543DWG4 delivers optimal balance of speed, drive strength, and legacy 74F compatibility for commercial-temperature bus interface designs.
Availability
SN74F543DWG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy CPU bus extension, programmable logic data routing, and TTL-level bus arbitration requiring stable component supply and long-term obsolescence support.
Supply support for SN74F543DWG4 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial, automotive, and consumer applications.
The SN74F543DWG4 belongs to TI's 74F TTL logic family, designed specifically for high-speed, low-power registered data transfer in commercial-grade digital systems requiring precise timing and robust bus interfacing.
FAQ
What is the maximum operating temperature range for the SN74F543DWG4?
The SN74F543DWG4 is characterized for operation from 0°C to 70°C, meeting commercial-grade temperature specifications. It is not rated for extended industrial (–40°C to 85°C) or automotive temperature ranges. Thermal derating or additional heatsinking is not supported per datasheet, and operation outside this range may result in timing violations or output instability. Always verify ambient and junction temperature limits in final system layout when deploying SN74F543DWG4.
Does the SN74F543DWG4 support true bidirectional data flow without external control logic?
Yes, the SN74F543DWG4 supports fully independent bidirectional data flow using dedicated CEAB/LEAB/OEAB for A-to-B and CEBA/LEBA/OEBA for B-to-A paths. Each direction operates autonomously - for example, A→B latching can occur while B→A outputs remain disabled. This eliminates need for external multiplexers or sequencers in bus interface designs, making SN74F543DWG4 self-contained for dual-lane registered transceivers.
What are the absolute maximum ratings for output current on the SN74F543DWG4 B-side pins?
The absolute maximum rating for output current on SN74F543DWG4 B1–B8 pins is 128 mA in the low state, per the Absolute Maximum Ratings table. However, the recommended operating condition specifies 64 mA (IOL) as the maximum sustained output current for reliable performance. Exceeding 64 mA risks exceeding VOL spec (0.55 V) and may accelerate device wear; continuous operation above 64 mA is not advised. The 128 mA limit applies only to short-duration fault conditions (≤1 second), not functional operation.
Can the SN74F543DWG4 be used as a direct replacement for SN74F543DW in existing PCBs?
Yes, SN74F543DWG4 is a functionally and pin-compatible variant of SN74F543DW, sharing identical SOIC-24 (DW) package dimensions, pinout, electrical specs, and timing behavior. The "G4" suffix denotes TI's green packaging standard (lead-free, RoHS-compliant finish), whereas legacy SN74F543DW may have leaded finish. No PCB layout changes are needed, but reflow profile must match Level-1 MSL requirements (260°C peak) for SN74F543DWG4.
How does the latch-enable timing of SN74F543DWG4 affect data setup requirements?
The SN74F543DWG4 requires data to be stable for at least 3.5 ns before the rising edge of LEAB or LEBA (tSU = 3.5 ns max), and to remain stable for 3.5 ns after that edge (th = 3.5 ns max). These tight setup/hold windows demand precise clock alignment in synchronous systems. Violating them may cause metastability or incorrect latched values. Designers must account for trace skew and driver propagation delays when generating LE signals relative to A/B data edges in SN74F543DWG4-based interfaces.
SN74F543DWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74F
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- 3mA, 24mA; 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
SN74F543DWG4 FAQ
1.How can I place an order for SN74F543DWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74F543DWG4 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 SN74F543DWG4 reliable?
The price and inventory of SN74F543DWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74F543DWG4 is usually 5 days.
3.What payment methods are accepted for SN74F543DWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74F543DWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74F543DWG4?
SN74F543DWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74F543DWG4 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 SN74F543DWG4?
For technical support, including SN74F543DWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74F543DWG4 requirements.
6.How does Aetrix verify that SN74F543DWG4 is sourced from the original manufacturer or authorized distributors?
All SN74F543DWG4 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 SN74F543DWG4 meets industry standards.
7.What is the process for return or replacement of SN74F543DWG4?
All SN74F543DWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74F543DWG4, 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 SN74F543DWG4 part is unused and in its original packaging.
Return procedure for SN74F543DWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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