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Renesas 74FCT543CTQG8
- Part No.:
- 74FCT543CTQG8
- Manufacturer:
- Renesas
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
74FCT543CTQG8.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 24QSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
74FCT543CTQG8 from Renesas Electronics is a non-inverting octal latched transceiver in QSOP-24 package, operating over –40°C to +85°C industrial temperature range. It features dual 8-bit bidirectional data paths with independent A-to-B and B-to-A latch/enable controls, ±1 µA max input/output leakage, 3.3 V typical VOH, 0.3 V typical VOL, and high-drive outputs (–15 mA IOH, 64 mA IOL). It enables isolated bus interfacing in backplane or modular system designs.
For engineers reviewing the 74FCT543CTQG8 datasheet, 74FCT543CTQG8 pinout, 74FCT543CTQG8 application, or 74FCT543CTQG8 equivalent, key selection criteria include TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max), 5.0 V ±5% supply operation, 5.3 ns max propagation delay (74FCT543CT grade), live-insertion support via power-off disable outputs, and JEDEC Std-18 compliance.
Technical Context
The 74FCT543CTQG8 implements two independent sets of eight D-type latches - one for A-to-B and one for B-to-A data flow - each controlled by dedicated CE (chip enable), LE (latch enable), and OE (output enable) inputs. All control inputs are active-low and fully asynchronous relative to data inputs.
It uses advanced dual-metal CMOS technology to achieve true TTL input compatibility (VIH/VIL thresholds matched to TTL logic families) and CMOS power efficiency (ICC ≤ 1 mA typical at 5 V). Output buffers provide 3-state capability with high sink current (64 mA IOL) and robust drive strength for driving terminated transmission lines or multiple loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 5.0 V ±5% - ensures interoperability with legacy 5 V TTL and mixed-voltage systems. |
| Propagation Delay | 5.3 ns max (tPLH/tPHL, CL = 50 pF, RL = 500 Ω) - supports high-speed synchronous bus handshaking up to ~100 MHz effective data rate. |
| Output Drive | –15 mA IOH / 64 mA IOL - drives heavy capacitive loads or multiple TTL inputs without external buffers. |
| Input Leakage | ±1 µA max (TA = –40°C to +85°C) - guarantees low standby current in powered-down subsystems. |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded control, instrumentation, and telecom infrastructure. |
| JEDEC Compliance | Meets or exceeds JEDEC Standard 18 - ensures mechanical and electrical interoperability across certified suppliers. |
Pinout & Package
74FCT543CTQG8 is housed in a 24-pin Quarter-size Small Outline Package (QSOP), 3.9 mm × 8.7 mm body, 0.635 mm pitch, RoHS-compliant green finish (Package Code: PCG24).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A7 | A-side bidirectional I/O terminals | When CEAB low and OEAB low: A inputs drive B outputs; when CEBA low and OEBA low: A becomes 3-state output reflecting B-side data. |
| B0–B7 | B-side bidirectional I/O terminals | When CEBA low and OEBA low: B inputs drive A outputs; when CEAB low and OEAB low: B becomes 3-state output reflecting A-side data. |
| CEAB | A-to-B chip enable (active low) | Enables A-to-B data path only when low; disables latching and output drivers when high. |
| CEBA | B-to-A chip enable (active low) | Enables B-to-A data path only when low; isolates B-side logic from A-side when high. |
| LEAB | A-to-B latch enable (active low) | Low = transparent mode (A→B pass-through); low-to-high edge captures and holds A data in latches. |
| LEBA | B-to-A latch enable (active low) | Low = transparent mode (B→A pass-through); low-to-high edge captures and holds B data in latches. |
| OEAB | A-to-B output enable (active low) | Controls 3-state B outputs: low = enabled (reflecting A latch contents); high = high-impedance. |
| OEBA | B-to-A output enable (active low) | Controls 3-state A outputs: low = enabled (reflecting B latch contents); high = high-impedance. |
| VCC | Positive supply | 5.0 V ±5% main power rail; all DC and switching specs referenced to this node. |
| GND | Ground reference | Common return path for all signals and supply currents; must be low-impedance for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH = 2.0 V min / VIL = 0.8 V max - eliminates level-shifting when interfacing with legacy 5 V microcontrollers or FPGAs. |
| Live-insertion support | Power-off disable outputs (IOFF ≤ ±1 µA at VCC = 0 V) - allows hot-swap of daughter cards without disrupting backplane voltage rails. |
| High sink current | 64 mA IOL per output - directly drives LEDs, optocouplers, or multiple 74-series inputs without external drivers. |
| Low quiescent current | ICC ≤ 1 mA typical - reduces system-level standby power in always-on industrial controllers. |
| Independent dual-path control | Separate CE/LE/OE for A↔B directions - enables asymmetric data flow management (e.g., A-to-B streaming while B-to-A polling). |
Applications
| Industrial Backplane Interface | Modular PLC I/O Expansion |
|---|---|
|
Use Scenario: Bidirectional data transfer between CPU module and field I/O modules across a 5 V parallel backplane with stub-based routing. IC Role / Device Role / Timing Role: Octal latched transceiver providing isolated, direction-controlled, and timing-synchronized data coupling between master and slave slots. Use Value: Enables deterministic read/write cycles using LEAB/LEBA strobes and CEAB/CEBA arbitration, reducing bus contention in multi-drop configurations. |
Use Scenario: Adding analog/digital I/O capacity to a programmable logic controller via hot-pluggable expansion cards. IC Role / Device Role / Timing Role: Bus interface IC managing handshake-controlled data exchange between base unit and expansion card under live insertion conditions. Use Value: Power-off disable outputs prevent backfeeding during card insertion/removal, satisfying IEC 61000-4-2 ESD and IEC 61000-4-4 EFT safety requirements. |
| Legacy System Bus Bridge | Test Equipment Data Capture |
|
Use Scenario: Interfacing modern FPGA-based test controllers with aging 5 V TTL instrumentation buses (e.g., GPIB auxiliary lines or custom parallel diagnostics ports). IC Role / Device Role / Timing Role: Level- and timing-transparent bridge IC translating between FPGA I/O banks and legacy bus signaling conventions. Use Value: True TTL input thresholds and 5.3 ns propagation delay ensure setup/hold timing margins are preserved across voltage-domain boundaries. |
Use Scenario: Capturing parallel digital waveforms from DUTs in automated test equipment with synchronized sampling and buffering. IC Role / Device Role / Timing Role: Latched input capture device holding sampled data until host processor reads via B-bus under OEAB control. Use Value: Independent LEAB/LEBA latching allows overlapping acquisition and readout phases, increasing test throughput by eliminating bus idle time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latched transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74FCT543ATQG8 | Same pinout and function; faster propagation delay (6.5 ns max vs. 5.3 ns for CT grade) and higher ICC (1 mA max vs. 0.5 mA max quiescent). | Preferred where tighter timing margins are required and higher static power is acceptable. | Select 74FCT543ATQG8 for high-speed deterministic control loops; select 74FCT543CTQG8 for lower-power industrial monitoring nodes. |
| SN74F543N | Through-hole PDIP-24 package; identical logic function but higher ICC (5 mA typical), no power-off disable (IOFF not specified), and wider propagation delay (10 ns max). | Suitable for prototyping or legacy board replacements where surface-mount constraints do not apply. | Choose SN74F543N only for through-hole designs or legacy repair; 74FCT543CTQG8 offers superior power, speed, and live-insertion capability in QSOP. |
Compared with 74FCT543ATQG8, the 74FCT543CTQG8 trades minor speed reduction for lower quiescent current and improved thermal stability in extended industrial environments; versus SN74F543N, it delivers surface-mount integration, live-insertion safety, and 80% lower static power consumption.
Availability
74FCT543CTQG8 is available at Aetrix Electronics and suitable for industrial backplane interfaces, modular PLC I/O expansion, and legacy system bus bridging requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for 74FCT543CTQG8 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
Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, and IoT applications.
The 74FCT543CTQG8 belongs to Renesas' Fast CMOS logic family, designed specifically for high-reliability, low-power, TTL-compatible interfacing in industrial control and communications infrastructure.
FAQ
What is the operating voltage range for the 74FCT543CTQG8?
The 74FCT543CTQG8 operates at VCC = 5.0 V ±5%, i.e., 4.75 V to 5.25 V. This range ensures full compliance with TTL logic thresholds and guarantees all AC/DC specifications-including VOH ≥ 2.4 V, VOL ≤ 0.55 V, and tPLH ≤ 5.3 ns-as validated across the industrial temperature range (–40°C to +85°C). Operation outside this window may result in undefined behavior or parametric failure.
Does the 74FCT543CTQG8 support live insertion?
Yes, the 74FCT543CTQG8 supports live insertion due to its power-off disable feature: when VCC = 0 V, IOFF leakage is limited to ±1 µA maximum on all I/O pins. This prevents back-driving of powered system buses during hot-swap events. The feature is explicitly characterized and guaranteed per datasheet Section "DC Electrical Characteristics" and applies to both A0–A7 and B0–B7 terminals.
How does the latch enable (LE) function differ from chip enable (CE) in the 74FCT543CTQG8?
In the 74FCT543CTQG8, CEAB/CEBA gates data path activation (enabling latch transparency and output driver readiness), while LEAB/LEBA controls data capture timing: a low LE enables real-time pass-through; a low-to-high transition stores the current A/B inputs into internal latches. Both CE and LE must be asserted (low) for functional data transfer-CE alone does not cause latching.
What is the maximum capacitive load the 74FCT543CTQG8 can drive reliably?
The 74FCT543CTQG8 is characterized for CL = 50 pF in switching tests (tPLH/tPHL), and its 64 mA IOL rating supports driving ≥10 standard TTL loads (each ~10 pF + 1.6 kΩ) simultaneously. For heavier loads (>75 pF), layout best practices-short traces, local decoupling, and series termination-are recommended to maintain signal integrity and avoid overshoot beyond the absolute max VTERM limit of VCC + 0.5 V.
Is the 74FCT543CTQG8 pin-compatible with the 74FCT543ATQG8?
Yes, the 74FCT543CTQG8 and 74FCT543ATQG8 share identical QSOP-24 pinout, terminal functions, and DC/AC electrical interface definitions. They differ only in speed grade (CT = 5.3 ns max tPLH, AT = 6.5 ns max) and quiescent current (CT = 0.5 mA max ICC, AT = 1 mA max), making them direct drop-in alternatives where timing or power targets permit interchange.
74FCT543CTQG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 74FCT
- Package/Case:
- 24-SSOP (0.154", 3.90mm 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:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QSOP
74FCT543CTQG8 FAQ
1.How can I place an order for 74FCT543CTQG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74FCT543CTQG8 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 74FCT543CTQG8 reliable?
The price and inventory of 74FCT543CTQG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74FCT543CTQG8 is usually 5 days.
3.What payment methods are accepted for 74FCT543CTQG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74FCT543CTQG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74FCT543CTQG8?
74FCT543CTQG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74FCT543CTQG8 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 74FCT543CTQG8?
For technical support, including 74FCT543CTQG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74FCT543CTQG8 requirements.
6.How does Aetrix verify that 74FCT543CTQG8 is sourced from the original manufacturer or authorized distributors?
All 74FCT543CTQG8 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 74FCT543CTQG8 meets industry standards.
7.What is the process for return or replacement of 74FCT543CTQG8?
All 74FCT543CTQG8 units undergo pre-shipment inspection (PSI). If there is an issue with 74FCT543CTQG8, 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 74FCT543CTQG8 part is unused and in its original packaging.
Return procedure for 74FCT543CTQG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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