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Diodes Incorporated PI74FCT543ATS
- Part No.:
- PI74FCT543ATS
- Manufacturer:
- Diodes Incorporated
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
PI74FCT543ATS.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,859
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Product details
Overview
PI74FCT543ATS from Pericom Semiconductor is an 8-bit non-inverting latched transceiver with dual 8-bit D-type latches, TTL-compatible I/O, integrated 25Ω series output resistors, and independent A-to-B/B-to-A control via CEAB/CEBA, LEAB/LEBA, and OEAB/OEBA signals. It operates from 4.5V to 5.5V across –40°C to +85°C and is used in bidirectional data bus isolation for industrial backplanes and legacy microprocessor expansion interfaces.
For engineers reviewing the PI74FCT543ATS datasheet, PI74FCT543ATS pinout, PI74FCT543ATS application, or PI74FCT543ATS equivalent, key selection criteria include latch-controlled bidirectional flow, 25Ω on-die termination eliminating external resistors, sub-5ns propagation delay (543DT grade), and compatibility with FAST™-series PCB footprints in 24-pin SOIC.
Technical Context
The device implements two independent 8-bit transparent/latched data paths: A-to-B and B-to-A, each with separate enable (CE), latch (LE), and output enable (OE) controls. All outputs feature built-in 25Ω series resistors to suppress transmission-line reflections without external termination.
Inputs include hysteresis (200mV) for noise immunity; outputs drive TTL loads with VOH ≥2.4V at –15mA and VOL ≤0.50V at 12mA (25Ω series). Quiescent ICC is ≤500µA, and dynamic supply current scales with toggle rate per the ICCD formula.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 8-bit non-inverting latched transceiver with dual independent A↔B paths |
| Supply Voltage | 4.5V–5.5V - supports standard 5V TTL/CMOS system rails |
| Propagation Delay | 2.5–4.4ns (tPLH/tPHL, 543DT grade) - enables >100MHz bus operation |
| Output Termination | 25Ω series resistor on all outputs - eliminates need for external termination resistors |
| Input Hysteresis | 200mV - improves noise margin against ground bounce and EMI in dense PCBs |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and backplane applications |
| I/O Voltage Levels | TTL-compatible inputs (VIH = 2.0V, VIL = 0.8V); outputs drive standard TTL loads |
Pinout & Package
PI74FCT543ATS is supplied in a 24-pin 300-mil wide plastic SOIC (Small Outline Integrated Circuit) package with standard JEDEC MS-013AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A0–A7 | A-side data inputs (A→B path) or 3-state outputs (B→A path) |
| 9 | GND | Ground reference for logic and power domains |
| 10, 11, 12, 13, 14, 15, 16, 17 | B0–B7 | B-side data inputs (B→A path) or 3-state outputs (A→B path) |
| 18 | VCC | +5V power supply pin (4.5–5.5V range) |
| 19 | OEAB | A-to-B output enable (active LOW - enables B-output drivers) |
| 20 | CEAB | A-to-B enable (active LOW - enables A-input sampling and B-latch transparency) |
| 21 | LEAB | A-to-B latch enable (active LOW - latches A-data on rising edge) |
| 22 | OEBA | B-to-A output enable (active LOW - enables A-output drivers) |
| 23 | CEBA | B-to-A enable (active LOW - enables B-input sampling and A-latch transparency) |
| 24 | LEBA | B-to-A latch enable (active LOW - latches B-data on rising edge) |
Key Features
| Feature | Design Value |
|---|---|
| On-die 25Ω series termination | Reduces signal reflections on PCB traces up to 10cm, eliminating eight external 25Ω resistors |
| Independent dual-path control | Separate CE/LE/OE pins per direction allow asynchronous A↔B data transfer without bus contention |
| Hysteresis on all inputs | 200mV input threshold margin prevents chatter during slow-rising or noisy control signals |
| Low ground bounce | Optimized output driver slew rate limits simultaneous switching noise below 50mV peak |
| FAST™-series pin compatibility | Direct drop-in replacement for bipolar 74F543 in existing 24-pin SOIC layouts |
Applications
| Industrial Backplane Interface | Legacy Microprocessor Expansion |
|---|---|
|
Use Scenario: Bidirectional data transfer between CPU and peripheral cards in modular PLC chassis with 10–15cm trace lengths. IC Role / Device Role / Timing Role: Latched transceiver isolating address/data buses between slots; provides controlled timing via LEAB/LEBA pulse synchronization. Use Value: On-die 25Ω termination maintains signal integrity without layout redesign; hysteresis rejects noise from relay switching in adjacent slots. |
Use Scenario: Adding ISA-bus-compatible peripherals to aging x86-based test equipment using 5V logic rails. IC Role / Device Role / Timing Role: Level-shifting and bus-isolation transceiver enabling Z80/8086-compatible timing with programmable latch windows. Use Value: Pin-for-pin FAST™ replacement allows reuse of legacy PCBs; TTL-level I/O ensures compatibility with 1980s-era peripheral ASICs. |
| Automated Test Equipment (ATE) Fixture | Industrial Data Acquisition Module |
|
Use Scenario: High-speed digital pattern generator interfacing to DUT via ribbon cable with unterminated stubs. IC Role / Device Role / Timing Role: Output driver with controlled edge rate and termination, reducing overshoot/undershoot on 30cm cables. Use Value: 25Ω series resistance matches typical 50–75Ω cable impedance, cutting reflected energy by >80% versus un-terminated drivers. |
Use Scenario: Isolating sensor ADC outputs from microcontroller I/O in factory-floor vibration monitoring systems. IC Role / Device Role / Timing Role: Latched buffer holding sampled analog front-end data until MCU initiates read cycle via OEAB/CEAB handshake. Use Value: Low ICC (≤500µA quiescent) extends battery life in portable DAQ units; –40°C to +85°C rating ensures reliability near motors and drives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar latched transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74F543PC | Bipolar FAST™ implementation; higher ICC (20mA typical), no on-die termination, slower tPLH (10ns min) | Requires external 25Ω resistors; unsuitable for low-power or high-density layouts | Select only when legacy FAST™ board reuse mandates identical AC characteristics and thermal profile |
| SN74F543N | Same bipolar architecture as 74F543PC; identical pinout but ceramic DIP package; no hysteresis | Lacks input hysteresis - vulnerable to noise in industrial environments | Prefer only for through-hole prototyping where SOIC rework is impractical |
Compared with 74F543PC and SN74F543N, PI74FCT543ATS delivers lower power (500µA vs 20mA quiescent), integrated termination (no BOM additions), and noise-immune inputs (200mV hysteresis), making it optimal for modern industrial PCBs requiring reliability and density.
Availability
PI74FCT543ATS is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy microprocessor expansions, automated test equipment fixtures, and industrial data acquisition modules requiring stable component supply and long-term lifecycle support.
Supply support for PI74FCT543ATS 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
Pericom Semiconductor (now part of Diodes Incorporated) designed high-speed CMOS logic solutions for industrial, communications, and computing markets before its 2016 acquisition.
The PI74FCT series targets 5V logic upgrades requiring FAST™ compatibility, low noise, and reduced power - specifically engineered for backplane, bus interface, and legacy system modernization applications.
FAQ
Can PI74FCT543ATS operate at 3.3V?
No. The device is specified only for 4.5V–5.5V VCC operation. Its TTL-compatible inputs require VIH ≥2.0V and VIL ≤0.8V, and internal circuitry is not characterized below 4.5V. Attempting 3.3V operation risks undefined logic states, increased propagation delay, and potential latch-up.
What is the maximum capacitive load supported on outputs?
The datasheet specifies CL = 50pF for switching characterization. Outputs can reliably drive up to 70pF while maintaining tPLH/tPHL within 4.4ns (543DT grade) and VOL ≤0.50V at 12mA, provided trace inductance remains below 10nH and termination matches the 25Ω series resistor.
How does the 25Ω series resistor affect rise/fall times?
The integrated 25Ω resistor increases output impedance, resulting in measured tR/tF of 2.1–2.8ns (20%–80%) into 50pF. This intentional slowing reduces harmonic content above 200MHz, lowering EMI and improving signal integrity on unterminated PCB traces up to 10cm.
Is PI74FCT543ATS pin-compatible with PI74FCT544ATS?
No. While both are 24-pin SOIC transceivers, PI74FCT544ATS is inverting (A→B output = inverted A-input), whereas PI74FCT543ATS is non-inverting. Their truth tables and functional behavior differ; direct substitution will invert data and cause system failure unless logic polarity is corrected elsewhere.
PI74FCT543ATS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- 74FCT
- Package/Case:
- 20-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:
- 15mA, 64mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
PI74FCT543ATS FAQ
1.How can I place an order for PI74FCT543ATS through Aetrix?
Please submit a Request for Quotation (RFQ) for PI74FCT543ATS 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 PI74FCT543ATS reliable?
The price and inventory of PI74FCT543ATS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI74FCT543ATS is usually 5 days.
3.What payment methods are accepted for PI74FCT543ATS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI74FCT543ATS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI74FCT543ATS?
PI74FCT543ATS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI74FCT543ATS 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 PI74FCT543ATS?
For technical support, including PI74FCT543ATS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI74FCT543ATS requirements.
6.How does Aetrix verify that PI74FCT543ATS is sourced from the original manufacturer or authorized distributors?
All PI74FCT543ATS 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 PI74FCT543ATS meets industry standards.
7.What is the process for return or replacement of PI74FCT543ATS?
All PI74FCT543ATS units undergo pre-shipment inspection (PSI). If there is an issue with PI74FCT543ATS, 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 PI74FCT543ATS part is unused and in its original packaging.
Return procedure for PI74FCT543ATS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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