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onsemi 74F543SPC
- Part No.:
- 74F543SPC
- Manufacturer:
- onsemi
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
74F543SPC.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,623
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Product details
Overview
74F543SPC from Fairchild Semiconductor is an octal registered transceiver with dual 8-bit D-type latch sets, separate A-to-B and B-to-A control paths, 24 mA sink capability on A-side outputs, 64 mA on B-side outputs, and operates at +4.5V to +5.5V supply voltage. It enables bidirectional data buffering with independent latch and output enable for bus isolation in TTL-level systems.
For engineers reviewing the 74F543SPC datasheet, pinout, applications, or equivalent options, key selection criteria include 24-pin PDIP (JEDEC MS-001, 0.300" wide) package compatibility, 3-STATE output drive strength asymmetry (A: 24 mA / B: 64 mA), propagation delays under 12.5 ns, and independent CE/LE/OE control per direction.
Technical Context
The 74F543SPC implements two independent 8-bit register paths: A-to-B uses CEAB, LEAB, and OEAB; B-to-A uses CEBA, LEBA, and OEBA. Each path supports transparent latching (LE low) followed by storage (LE rising edge), with 3-STATE output buffers enabled only when both CE and OE are low.
It features asymmetric DC drive: A-side outputs (A0–A7 as B-to-A drivers) sink up to 24 mA, while B-side outputs (B0–B7 as A-to-B drivers) sink up to 64 mA. Input thresholds meet standard TTL levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and AC timing includes tPLH/tPHL ≤ 12.5 ns (max) at CL = 50 pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +4.5 V to +5.5 V - ensures compatibility with standard 5 V TTL logic rails and noise margin compliance. |
| A-Side Output Sink Current | 24 mA - supports driving heavier loads on the A port (e.g., multiple TTL inputs or wired-AND buses). |
| B-Side Output Sink Current | 64 mA - enables direct interface to higher-current peripherals or bus termination networks on the B port. |
| Propagation Delay (max) | 12.5 ns - guarantees sub-80 MHz bus operation with setup/hold margins at CL = 50 pF. |
| Input Thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V - ensures robust recognition of TTL-compatible logic levels across temperature. |
| Operating Temperature | 0°C to +70°C - validated for commercial-grade industrial control and computing backplane applications. |
Pinout & Package
74F543SPC is housed in a 24-lead Plastic Dual-In-Line Package (PDIP) per JEDEC MS-001, 0.300" wide body, with 0.100" lead pitch and through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A0–A7 Data I/O | Bi-directional terminals: inputs when driving B-side, 3-STATE outputs when receiving from B-side. |
| 9, 10, 11, 12, 13, 14, 15, 16 | B0–B7 Data I/O | Bi-directional terminals: inputs when driving A-side, 3-STATE outputs when receiving from A-side. |
| 17 | OEAB | A-to-B Output Enable (active LOW) - controls 3-STATE buffer activation for B0–B7 outputs. |
| 18 | CEAB | A-to-B Enable (active LOW) - enables data flow path from A to B latches. |
| 19 | LEAB | A-to-B Latch Enable (active LOW) - makes A latches transparent; rising edge stores A data to B outputs. |
| 20 | VCC | Positive supply terminal (+4.5 V to +5.5 V). |
| 21 | GND | Ground reference for all logic and I/O circuits. |
| 22 | LEBA | B-to-A Latch Enable (active LOW) - makes B latches transparent; rising edge stores B data to A outputs. |
| 23 | CEBA | B-to-A Enable (active LOW) - enables data flow path from B to A latches. |
| 24 | OEBA | B-to-A Output Enable (active LOW) - controls 3-STATE buffer activation for A0–A7 outputs. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 8-bit latch paths | Enables simultaneous A→B and B→A data staging without contention, supporting full-duplex bus arbitration. |
| Asymmetric output drive strength | A-side (24 mA) and B-side (64 mA) ratings allow optimized load matching-e.g., B side drives bus stubs, A side interfaces local logic. |
| Separate CE/LE/OE per direction | Permits precise timing control: latch capture, storage, and output enable can be sequenced independently for each direction. |
| 3-STATE outputs with high sink current | Eliminates bus contention during idle cycles; B-side 64 mA rating supports termination of unterminated transmission lines. |
Applications
| Backplane Data Buffering | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Isolating and regenerating parallel data between CPU and peripheral slots in a 19-inch rack-mounted backplane. IC Role / Device Role / Timing Role: Registered transceiver providing synchronized, glitch-free data transfer with direction-controlled latching and bus hold-off. Use Value: Prevents metastability and skew accumulation across long traces using controlled latch edges and 3-STATE isolation during direction switching. | Use Scenario: Interfacing microcontroller-based main modules with modular analog/digital I/O cards in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional level-shifting and drive-strengthening transceiver managing command/data exchange between controller and field modules. Use Value: B-side 64 mA drive directly powers optocoupler inputs or relay drivers; A-side 24 mA suffices for local logic fan-out. |
| Legacy System Bus Extension | TTL-Compatible Memory Interface |
Use Scenario: Extending address/data bus length in retro-computing or test equipment where signal integrity degrades beyond 15 cm. IC Role / Device Role / Timing Role: Registered repeater that re-times and re-drives TTL signals with deterministic propagation delay and setup/hold compliance. Use Value: Enables reliable 8-bit parallel communication over extended PCB traces without added clock skew or timing violations. | Use Scenario: Connecting microprocessor data bus to external SRAM or EPROM devices requiring strict timing alignment and drive capability. IC Role / Device Role / Timing Role: Direction-controlled data register ensuring write data is latched before memory strobe and read data is driven onto bus only when enabled. Use Value: Eliminates bus contention during memory access cycles via independent OE/CE sequencing and 3-STATE output control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F543N | Same logic function, identical pinout, same 24-pin PDIP (JEDEC MS-011, 0.600" wide), but larger body width than 74F543SPC's 0.300" MS-001 package. | Requires PCB footprint revision due to wider package; otherwise drop-in functional replacement. | Select when legacy board layout accommodates 0.600" DIP or when sourcing SN74F543N is more cost-effective. |
| 74ACT543PC | Advanced CMOS version: 4.5–5.5 V supply, lower ICC (20 mA typ), faster tPLH/tPHL (5.5 ns max), but A/B output drive symmetric at ±24 mA (no 64 mA B-side). | Lacks high-current B-side drive; unsuitable where >24 mA sink is required on one port. | Choose for lower power and speed-critical designs where asymmetric drive is unnecessary. |
Compared with SN74F543N and 74ACT543PC, the 74F543SPC uniquely delivers 64 mA B-side sink current in a compact 0.300" PDIP, making it optimal for space-constrained legacy TTL systems needing high-drive bus interfacing without footprint change from N24C.
Availability
74F543SPC is available at Aetrix Electronics and suitable for backplane data buffering, industrial PLC I/O expansion, and legacy system bus extension requiring stable component supply and long-term obsolescence management.
Supply support for 74F543SPC 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in analog and mixed-signal ICs, power management, and logic families before its acquisition by ON Semiconductor in 2016.
The 74F543SPC belongs to Fairchild's 74F Fast TTL logic family, designed for high-speed, low-power registered data transfer in industrial control, computing backplanes, and instrumentation systems.
FAQ
What is the package type and dimensions of the 74F543SPC?
The 74F543SPC uses a 24-lead Plastic Dual-In-Line Package (PDIP) conforming to JEDEC MS-001 mechanical standard, with a 0.300-inch body width and 0.100-inch lead pitch. Its physical footprint differs from the wider 0.600-inch MS-011 PDIP used by variants like 74F543PC, requiring specific PCB land patterns.
Does the 74F543SPC support bidirectional data flow with independent control?
Yes, the 74F543SPC supports fully independent A-to-B and B-to-A data paths. Each direction has dedicated Control Enable (CEAB/CEBA), Latch Enable (LEAB/LEBA), and Output Enable (OEAB/OEBA) inputs, allowing simultaneous latching, storage, and 3-STATE output control without interference.
What are the maximum output sink currents for A-side and B-side pins on the 74F543SPC?
The 74F543SPC specifies 24 mA maximum sink current for A-side outputs (A0–A7 when acting as B-to-A drivers) and 64 mA maximum sink current for B-side outputs (B0–B7 when acting as A-to-B drivers), as confirmed in the Absolute Maximum Ratings and DC Electrical Characteristics tables.
Can the 74F543SPC operate at 3.3 V supply voltage?
No, the 74F543SPC is specified only for +4.5 V to +5.5 V supply operation. Its input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and output drive characteristics are optimized for 5 V TTL logic families; operation below 4.5 V may result in undefined behavior or failure to meet timing and drive specifications.
Is the 74F543SPC pin-compatible with other 74F543 variants such as 74F543PC or 74F543SC?
The 74F543SPC shares identical logic functionality and pin assignment with other 74F543 variants, but its N24C PDIP package (JEDEC MS-001, 0.300" wide) differs mechanically from the N24A (MS-011, 0.600") and M24B (SOIC) packages. Electrical pinout is identical; only PCB footprint must be verified for mechanical fit.
74F543SPC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74F
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- 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; 3mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-PDIP
74F543SPC FAQ
1.How can I place an order for 74F543SPC through Aetrix?
Please submit a Request for Quotation (RFQ) for 74F543SPC 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 74F543SPC reliable?
The price and inventory of 74F543SPC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74F543SPC is usually 5 days.
3.What payment methods are accepted for 74F543SPC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74F543SPC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74F543SPC?
74F543SPC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74F543SPC 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 74F543SPC?
For technical support, including 74F543SPC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74F543SPC requirements.
6.How does Aetrix verify that 74F543SPC is sourced from the original manufacturer or authorized distributors?
All 74F543SPC 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 74F543SPC meets industry standards.
7.What is the process for return or replacement of 74F543SPC?
All 74F543SPC units undergo pre-shipment inspection (PSI). If there is an issue with 74F543SPC, 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 74F543SPC part is unused and in its original packaging.
Return procedure for 74F543SPC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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