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onsemi 74F368PC
- Part No.:
- 74F368PC
- Manufacturer:
- onsemi
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
74F368PC.pdf
- Description:
- IC BUFFER INVERT 5.5V 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,633
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Product details
Overview
74F368PC from Fairchild Semiconductor is a hex inverter/buffer IC with active-low 3-STATE outputs, designed for bus interface and data routing in TTL-compatible digital systems. It features 6 independent channels, ±64 mA output sink capability, 4.5–5.5 V supply range, and propagation delays as low as 1.0 ns (tPHL, typical), enabling high-speed bidirectional bus control in industrial control and instrumentation.
For engineers reviewing the 74F368PC datasheet, pinout, applications, or equivalent options, key selection criteria include active-low enable logic, 16-pin PDIP package compatibility, 3-STATE bus drive strength, and TTL-level input thresholds (VIL = 0.8 V, VIH = 2.0 V) for legacy system integration.
Technical Context
The 74F368PC implements six identical inverting buffer stages, each with an independent active-low output enable (OE) input controlling high-impedance state entry/exit. Its npn-base input structure minimizes capacitive loading on driving sources, supporting fan-out of up to 600 standard TTL loads per input.
It operates strictly within 0°C to +70°C ambient temperature and requires +4.5 V to +5.5 V VCC; all timing parameters-including tPZH (enable time, max 8.5 ns), tPLZ (disable time, max 7.0 ns), and tPHL (propagation delay, max 5.5 ns)-are specified at CL = 50 pF and VCC = 5.0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | +4.5 V to +5.5 V - Ensures compatibility with standard 5 V TTL power rails and noise margin stability |
| VIH / VIL | 2.0 V / 0.8 V - Defines unambiguous TTL logic recognition thresholds for reliable signal interpretation |
| IOL / IOH | 64 mA / −12 mA - Supports direct drive of multiple TTL inputs or moderate-current bus termination |
| tPHL / tPLH | 1.0 ns / 2.5 ns (typ) - Enables sub-5 ns cycle times in high-speed synchronous bus architectures |
| tPZH / tPLZ | 2.0 ns / 2.0 ns (min) - Guarantees fast 3-STATE activation/deactivation for dynamic bus arbitration |
| Input Loading | 1.0 U.L. (unit load) - Matches standard TTL input impedance, simplifying fan-out calculation |
| ICCZ | 35–48 mA (max) - Quantifies quiescent current during 3-STATE hold, critical for standby power budgeting |
Pinout & Package
74F368PC is housed in a 16-lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" wide, with through-hole mounting and industry-standard pin spacing (0.100" pitch). Pin 1 is marked by a notch or dot; pin numbering follows standard DIP convention (counter-clockwise from top-left).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 5, 9, 10, 13 | Inverter Input (I) | Accepts TTL-level signals; each drives one inverting buffer stage |
| 2, 3, 6, 7, 11, 12 | Inverter Output (O) | Provides inverted logic with 3-STATE control; sinks up to 64 mA |
| 8 | GND | Ground reference for all internal circuitry and I/O |
| 16 | VCC | +4.5 V to +5.5 V supply rail; decoupling capacitor required near pin |
| 14, 15 | OE1, OE2 | Active-low 3-STATE enables for groups of three outputs each (OE1→pins 2,6,11; OE2→pins 3,7,12) |
Key Features
| Feature | Design Value |
|---|---|
| 3-STATE Output Sink Current | 64 mA per output - Enables direct connection to terminated data buses without external drivers |
| High-Speed Propagation | tPHL ≤ 5.5 ns (max) - Supports >100 MHz clock-domain interfacing in burst-mode systems |
| Bus-Oriented Architecture | Dual active-low OE inputs (OE1/OE2) - Allows independent control of two 3-bit bus segments for multiplexed addressing |
| Low-Input Loading | 1.0 unit load per input - Reduces capacitive burden on upstream drivers, preserving signal integrity |
| TTL-Compatible Thresholds | VIH = 2.0 V, VIL = 0.8 V - Ensures interoperability with legacy 74LS/74F logic families without level-shifting |
Applications
| Industrial PLC Backplane Interface | Legacy Test Equipment Data Bus |
|---|---|
Use Scenario: Bidirectional data transfer between CPU module and I/O expansion cards in modular programmable logic controllers. IC Role / Device Role / Timing Role: Hex inverter/buffer with 3-STATE control acts as direction-controlled bus transceiver for address/data multiplexing. Use Value: Dual OE inputs allow independent gating of two 3-bit sub-buses, reducing control line count while maintaining full 6-bit throughput. | Use Scenario: Signal conditioning and isolation between microcontroller-based test sequencers and DUT interface boards. IC Role / Device Role / Timing Role: Inverting buffer provides logic-level translation and drive strengthening for TTL-compatible test vectors. Use Value: 64 mA sink capability drives long PCB traces and multiple TTL inputs simultaneously, eliminating need for discrete driver stages. |
| Automotive ECU Diagnostic Port | Avionics Maintenance Interface |
Use Scenario: Isolating diagnostic command lines between vehicle CAN gateway and service tool connector. IC Role / Device Role / Timing Role: 3-STATE inverter buffers diagnostic request signals while preventing backfeed during port disconnection. Use Value: High-impedance state ensures zero current leakage into disconnected ports, meeting ISO 11898-3 electrical safety requirements. | Use Scenario: Interfacing ground-support equipment with aging avionics LRUs using parallel maintenance buses. IC Role / Device Role / Timing Role: Inverter/buffer restores signal edge integrity degraded by long cable runs and connector parasitics. Use Value: Sub-6 ns propagation delay preserves setup/hold timing margins across 2-meter shielded cables at 10 MHz bus rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar hex inverter/buffer with 3-STATE applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F368N | Identical logic function, pinout, and DC/AC specs; manufactured by Texas Instruments under same F-series spec | No functional deviation; validated for drop-in replacement in existing 74F368PC designs | Preferred when TI-sourced components required for supply chain diversification |
| 74ACT368PC | Higher speed (tPLH ≤ 3.5 ns typ), 5 V CMOS input thresholds (VIH = 3.5 V), lower ICCZ (10 µA max) | Not TTL-compatible; requires 3.5 V minimum VIH, unsuitable for legacy 74LS-driven systems | Select only when upgrading to ACT logic family and redesigning input drive capability |
Compared with SN74F368N and 74ACT368PC, the 74F368PC delivers proven TTL interoperability and robust 64 mA drive in legacy industrial systems, whereas SN74F368N offers identical behavior with alternate sourcing, and 74ACT368PC trades TTL compatibility for speed and lower static power-requiring full signal-level validation.
Availability
74F368PC is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy test equipment data buses, and automotive ECU diagnostic interfaces requiring stable component supply over extended production lifecycles.
Supply support for 74F368PC 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 leading designer and manufacturer of high-performance analog and mixed-signal semiconductors, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and automotive systems.
The 74F368PC belongs to the 74F Fast TTL logic family, engineered specifically for high-speed bus interface, data routing, and memory address buffering in systems demanding sub-10 ns timing and robust drive capability.
FAQ
What is the function of pins 14 and 15 on the 74F368PC?
Pins 14 and 15 are active-low output enable inputs (OE1 and OE2) that independently control the 3-STATE status of two groups of three outputs each. When OE1 is LOW, outputs at pins 2, 6, and 11 enter active (inverted) mode; when HIGH, they go high-impedance. The same applies to OE2 and pins 3, 7, and 12. This dual-enable architecture allows segmented bus control without additional logic. The 74F368PC datasheet confirms this behavior in the Function Table on page 2.
Does the 74F368PC support operation at 3.3 V supply voltage?
No, the 74F368PC is specified only for +4.5 V to +5.5 V VCC operation per its Absolute Maximum Ratings and Recommended Operating Conditions. At 3.3 V, it fails to meet VIH (2.0 V min) and VOL (0.55 V max) specifications, and output drive collapses below usable levels. Systems requiring 3.3 V compatibility must use alternatives like 74LVC368 or 74ALVC368. The 74F368PC is not rated for 3.3 V use.
What is the maximum capacitive load the 74F368PC can drive reliably?
The 74F368PC AC Electrical Characteristics specify timing parameters at CL = 50 pF, and its output drive strength (64 mA sink) supports heavier loads than typical TTL, but sustained operation beyond 50 pF degrades tPLH/tPHL and increases transition time. For loads >75 pF, series termination or buffer staging is recommended. The 74F368PC's published tPLZ/tPHZ disable/enable times also degrade above 50 pF, per page 3 of the Fairchild DS009521 datasheet.
How does the 74F368PC differ from the 74F366PC in functionality?
The 74F368PC has active-low output enables (OE1/OE2), while the 74F366PC uses active-high enables (EN1/EN2). Their pinouts differ: 74F366PC places EN1/EN2 at pins 1 and 15, whereas 74F368PC places OE1/OE2 at pins 14 and 15. Both share identical inverting buffer logic and 64 mA drive, but control polarity and pin mapping are incompatible. The 74F368PC cannot substitute for 74F366PC without board-level rewiring.
Is the 74F368PC RoHS compliant?
The original 74F368PC was manufactured prior to RoHS enforcement and contains leaded solder terminations and Pb in the die attach. No RoHS-compliant revision (e.g., "74F368PCX" or "74F368PCG") was released by Fairchild. Modern equivalents such as SN74F368N may offer RoHS variants, but the 74F368PC itself is non-RoHS. Aetrix Electronics supplies only original-spec 74F368PC devices with full traceability to vintage Fairchild lots.
74F368PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74F
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 2, 4 (Hex)
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
74F368PC FAQ
1.How can I place an order for 74F368PC through Aetrix?
Please submit a Request for Quotation (RFQ) for 74F368PC 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 74F368PC reliable?
The price and inventory of 74F368PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74F368PC is usually 5 days.
3.What payment methods are accepted for 74F368PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74F368PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74F368PC?
74F368PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74F368PC 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 74F368PC?
For technical support, including 74F368PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74F368PC requirements.
6.How does Aetrix verify that 74F368PC is sourced from the original manufacturer or authorized distributors?
All 74F368PC 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 74F368PC meets industry standards.
7.What is the process for return or replacement of 74F368PC?
All 74F368PC units undergo pre-shipment inspection (PSI). If there is an issue with 74F368PC, 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 74F368PC part is unused and in its original packaging.
Return procedure for 74F368PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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