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onsemi 74F545PC
- Part No.:
- 74F545PC
- Manufacturer:
- onsemi
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
74F545PC.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,968
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Product details
Overview
74F545PC from Fairchild Semiconductor is an octal bidirectional transceiver with 3-STATE outputs, designed for bus-oriented microprocessor and digital communications systems. It provides A-to-B or B-to-A data flow under T/R control, delivers 24 mA drive on A ports and 64 mA on B ports, and operates at +4.5V to +5.5V supply voltage in a 20-pin PDIP package.
For engineers reviewing the 74F545PC datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional bus isolation capability, asymmetric drive strength (24 mA/64 mA), 3-STATE output control via OE and T/R inputs, and compatibility with TTL-level logic systems operating across 0°C to +70°C ambient range.
Technical Context
The 74F545PC implements straight-through bidirectional data routing controlled by a single Transmit/Receive (T/R) input: low enables B-to-A transfer, high enables A-to-B transfer. Output Enable (OE) is active-low and places both A and B ports into high-impedance state independently of direction.
It features dual-bus drive asymmetry-A-side outputs rated for −3 mA/24 mA (IOH/IOL), B-side for −12 mA/64 mA-with guaranteed 4000 V ESD protection and propagation delays as low as 2.5 ns (tPLH/tPHL) under 50 pF load at +25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +4.5 V to +5.5 V - ensures compatibility with standard 5 V TTL and CMOS bus systems |
| A-port Drive (IOL) | 24 mA - supports termination and fan-out for standard TTL loads on side A |
| B-port Drive (IOL) | 64 mA - enables direct driving of heavier bus loads or multiple receivers on side B |
| Propagation Delay | 2.5–7.0 ns - meets timing requirements for high-speed 8-bit bus transfers up to ~100 MHz |
| Input Voltage Thresholds | VIH = 2.0 V, VIL = 0.8 V - matches standard TTL logic levels for seamless interface |
| ESD Protection | ≥4000 V HBM - provides robust handling during board assembly and system integration |
Pinout & Package
74F545PC is housed in a 20-lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" wide, with through-hole mounting and industry-standard pin spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low Output Enable | Disables both A and B ports simultaneously into 3-STATE; required for bus arbitration |
| 2–9 (A0–A7) | Side A bidirectional I/O | 3-STATE inputs/outputs; 24 mA drive capability; connects to local subsystem bus |
| 10 (GND) | Ground reference | Common return path for all internal logic and output drivers |
| 11–18 (B0–B7) | Side B bidirectional I/O | 3-STATE inputs/outputs; 64 mA drive capability; interfaces to main system bus |
| 19 (T/R) | Transmit/Receive control | Low = B-to-A data flow; High = A-to-B data flow; determines real-time bus direction |
| 20 (VCC) | Positive supply | +4.5 V to +5.5 V power rail; decoupling capacitor required near pin for noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| Asymmetric bus drive | 24 mA on A ports, 64 mA on B ports - enables optimized loading for master/slave or controller/peripheral bus topologies |
| Dual independent 3-STATE control | Separate OE and T/R inputs - allows precise timing of direction change and bus release without contention |
| TTL-compatible thresholds | VIH = 2.0 V, VIL = 0.8 V - ensures interoperability with legacy 74LS/74F logic families without level shifting |
| High ESD immunity | ≥4000 V HBM - reduces risk of field failure during handling and in-system operation |
Applications
| Microprocessor Bus Interface | Industrial Control Backplane |
|---|---|
Use Scenario: Interfacing an 8-bit microcontroller's data bus to a peripheral expansion slot with shared address/data lines. IC Role / Device Role / Timing Role: Bidirectional transceiver managing time-multiplexed data flow between CPU and peripherals under T/R and OE control. Use Value: Eliminates need for separate directional buffers; 64 mA B-port drive sustains signal integrity across long backplane traces. | Use Scenario: Isolating PLC I/O modules from central controller bus to prevent fault propagation. IC Role / Device Role / Timing Role: Direction-controlled data bridge enabling read/write cycles between controller and modular I/O cards. Use Value: 3-STATE outputs allow hot-swap capability; asymmetric drive accommodates mixed-load bus segments. |
| Legacy System Data Translation | Test Equipment Signal Routing |
Use Scenario: Adapting vintage computer memory expansion cards with non-standard bus signaling to modern diagnostic tools. IC Role / Device Role / Timing Role: Level- and direction-transparent data conduit supporting TTL-compatible voltage domains and timing margins. Use Value: Matches 74F logic speed and drive strength; eliminates timing skew from added logic layers. | Use Scenario: Configurable signal path switching in automated test fixtures requiring programmable DUT connectivity. IC Role / Device Role / Timing Role: Software-directed bidirectional channel enabling flexible stimulus/response routing between instruments and device under test. Use Value: Single OE/T/R control simplifies FPGA-based sequencer logic; 20-pin PDIP eases manual prototyping and socket replacement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F245N | Identical 8-bit bidirectional architecture; same 24/64 mA drive; identical pinout and logic behavior | No functional difference; fully interchangeable in existing designs | Select when sourcing from Texas Instruments distribution channels or requiring TI-specific compliance documentation |
| 74ACT541PC | Unidirectional (A-to-B only); 24 mA drive only; CMOS input thresholds (VIH = 3.5 V), not TTL-compatible | Requires redesign of control logic and level-shifting for TTL systems | Consider only for new low-power CMOS designs where direction is fixed and higher noise margin is prioritized |
Compared with SN74F245N and 74ACT541PC, the 74F545PC offers verified TTL compatibility, true bidirectional operation with minimal control signals, and proven robustness in industrial bus environments-making it optimal for legacy system upgrades and mixed-logic bus bridging where pin-for-pin interchangeability and drive strength matching are critical.
Availability
74F545PC is available at Aetrix Electronics and suitable for microprocessor bus interface, industrial control backplane, and legacy system data translation requiring stable component supply and long-term obsolescence management.
Supply support for 74F545PC 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, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and computing infrastructure.
The 74F545PC belongs to the 74F Fast TTL logic family, engineered for high-speed, low-latency bus interfacing in microprocessor-based systems where timing predictability and drive strength are essential.
FAQ
What is the operating temperature range for the 74F545PC?
The 74F545PC is specified for commercial operation from 0°C to +70°C ambient temperature. Its absolute maximum junction temperature is +150°C, and it supports storage from −65°C to +150°C. This range aligns with standard TTL system environments and excludes extended industrial or automotive use without derating verification.
Does the 74F545PC support true bidirectional data flow without external logic?
Yes, the 74F545PC supports true bidirectional data flow using only two control inputs: Transmit/Receive (T/R) sets direction (A-to-B or B-to-A), and Output Enable (OE) places both sides in high-impedance state. No additional gates or latches are needed to manage bus contention or direction sequencing in the 74F545PC.
What is the maximum capacitive load the 74F545PC can drive reliably?
The 74F545PC AC specifications-including propagation delay (2.5–7.0 ns) and output timing-are characterized at CL = 50 pF. While it can drive heavier loads due to its 64 mA B-port sink capability, signal integrity beyond 50 pF requires careful PCB layout, termination, and may necessitate timing margin analysis for the 74F545PC in high-speed applications.
Is the 74F545PC pin-compatible with the SN74F245N?
Yes, the 74F545PC is functionally and pinout-identical to the SN74F245N: same 20-pin PDIP footprint, identical pin assignments (OE, T/R, A0–A7, B0–B7, VCC, GND), and matching electrical specs. Both devices are drop-in replacements in legacy designs where the 74F545PC or SN74F245N is specified.
Can the 74F545PC be used with 3.3 V logic systems?
No, the 74F545PC is a 5 V-only TTL device with VIH = 2.0 V minimum and VCC range of +4.5 V to +5.5 V. Its inputs are not 3.3 V tolerant, and its outputs swing near 0 V and VCC - making direct interface with 3.3 V systems unsafe without level-shifting circuitry for the 74F545PC.
74F545PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74F
- Package/Case:
- 20-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; 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
74F545PC FAQ
1.How can I place an order for 74F545PC through Aetrix?
Please submit a Request for Quotation (RFQ) for 74F545PC 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 74F545PC reliable?
The price and inventory of 74F545PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74F545PC is usually 5 days.
3.What payment methods are accepted for 74F545PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74F545PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74F545PC?
74F545PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74F545PC 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 74F545PC?
For technical support, including 74F545PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74F545PC requirements.
6.How does Aetrix verify that 74F545PC is sourced from the original manufacturer or authorized distributors?
All 74F545PC 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 74F545PC meets industry standards.
7.What is the process for return or replacement of 74F545PC?
All 74F545PC units undergo pre-shipment inspection (PSI). If there is an issue with 74F545PC, 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 74F545PC part is unused and in its original packaging.
Return procedure for 74F545PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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