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Renesas 74BC540AFP-E
- Part No.:
- 74BC540AFP-E
- Manufacturer:
- Renesas
- Package:
- -
- Datasheet:
-
74BC540AFP-E.pdf
- Description:
- OCTAL BUFFER/LINE DRIVER
- Quantity:
- Payment:
- Shipping:
Inventory:2,182
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Product details
Overview
74BC540AFP-E from Renesas Electronics is an octal inverting buffer/line driver with 3-state outputs fabricated using Bi-CMOS process, delivering high drive capability (64 mA sink), low power dissipation (~1/5 of bipolar logic at 10 MHz), and TTL-compatible inputs. It operates across –40°C to +85°C and is used in bus interface, memory address driving, and data routing applications where controlled output enable/disable is required.
For engineers reviewing the 74BC540AFP-E datasheet, 74BC540AFP-E pinout, 74BC540AFP-E application, or 74BC540AFP-E equivalent, key selection considerations include its 20-pin SOP package, dual active-low output enable (G1/G2), inverting logic function, and guaranteed 3-state isolation with <±50 µA off-state leakage.
Technical Context
The 74BC540AFP-E integrates eight identical inverting buffer stages, each with independent input (A1–A8) and output (Y1–Y8), controlled collectively by two active-low enable inputs (G1, G2). All outputs enter high-impedance state when either G1 or G2 is high.
Its Bi-CMOS architecture enables TTL-level input compatibility (VIH ≥ 2.0 V, VIL ≤ 0.8 V), rail-to-rail output swing (VOH ≥ 2.4 V at IOH = –3 mA; VOL ≤ 0.55 V at IOL = 64 mA), and fast propagation delays (3.0–7.0 ns at CL = 50 pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Inverting octal buffer with 3-state outputs |
| Supply Voltage | 4.5–5.5 V - compatible with standard 5 V TTL systems |
| Output Drive | 64 mA sink (VOL ≤ 0.55 V) - drives heavy capacitive loads or multiple TTL inputs |
| Propagation Delay | 3.0–7.0 ns (CL = 50 pF) - supports >100 MHz bus operation in short traces |
| Off-State Leakage | ±50 µA max - ensures minimal bus contention during tri-state |
| Operating Temp | –40°C to +85°C - suitable for industrial ambient environments |
| Input Compatibility | TTL-level - directly interfaces with 74LS/74F families without level shifting |
Pinout & Package
74BC540AFP-E uses a 20-pin SOP package (JEITA FP-20DAV, 0.70 mm pitch), measuring 12.6 × 7.8 mm with Ni/Pd/Au plating. Pin 1 is VCC; pin 20 is GND. The device has dual enable control and symmetrical A/Y pairing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Positive supply (4.5–5.5 V); decoupling capacitor required near pin |
| 2 | G2 | Active-low global output enable - high forces all Yn to high-Z |
| 3–10 | Y1–Y8 | Inverted buffered outputs - high-Z when G1 or G2 high |
| 11 | G1 | Active-low global output enable - high forces all Yn to high-Z |
| 12–19 | A1–A8 | Inverting inputs - TTL-compatible, internally pulled up when open |
| 20 | GND | Ground reference - must be low-impedance return path for all outputs |
Key Features
| Feature | Design Value |
|---|---|
| Bi-CMOS process | Combines bipolar speed and CMOS low static power - ICCZ ≤ 2.5 mA in 3-state |
| Open-input tolerance | Built-in pull-up resistors allow unused A pins to float safely without external bias |
| Power-off high-impedance | Outputs go high-Z when VCC = 0 V - prevents back-driving powered-down systems |
| Wide noise margin | VIH = 2.0 V min / VIL = 0.8 V max - robust against TTL signal degradation |
| Short-circuit protection | Limited IOS (–100 to –225 mA) - allows brief fault conditions without latch-up |
Applications
| Memory Address Bus Driver | Microcontroller Peripheral Interface |
|---|---|
Use Scenario: Driving 16-bit address lines from a microcontroller to SRAM or EPROM with fanout >10. IC Role / Device Role / Timing Role: Inverting buffer with 3-state control synchronizes with memory read/write strobes. Use Value: 64 mA sink current ensures clean edges into 50 pF trace + load capacitance; tPLH/tPHL ≤ 7 ns maintains setup/hold timing margins. |
Use Scenario: Isolating GPIO expansion ports between MCU and peripheral ICs sharing a common data bus. IC Role / Device Role / Timing Role: Bidirectional bus controller via G1/G2 enables/disables data flow on demand. Use Value: High-Z leakage <±50 µA prevents signal corruption when peripherals are unselected; TTL compatibility eliminates level translators. |
| Industrial PLC I/O Module | Digital Test Equipment Signal Conditioning |
Use Scenario: Buffering digital sensor outputs in noisy factory environments before ADC sampling. IC Role / Device Role / Timing Role: Signal conditioner with noise-immune input thresholds and strong drive to isolate sensitive analog sections. Use Value: –40°C to +85°C rating ensures reliability; VIH/VIL specs guarantee correct logic interpretation despite EMI-induced voltage droop. |
Use Scenario: Generating precise, synchronized stimulus waveforms for DUT testing with programmable enable timing. IC Role / Device Role / Timing Role: Waveform shaper and bus driver with sub-10 ns enable/disable transitions (tZH/tHZ ≤ 11 ns). Use Value: Fast output enable/disable allows dynamic bus allocation between test channels; low ICCZ reduces thermal drift in calibrated systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT540N | CMOS, 5 V only, higher VOH (4.4 V), lower VOL (0.5 V), no internal pull-ups | Requires external pull-ups for unused inputs; better noise immunity but less tolerant of floating nodes | Preferred where strict 5 V operation and lowest VOL are critical; not drop-in due to missing pull-ups |
| 74HC540PW | High-speed CMOS, wider VCC range (2–6 V), lower drive (7.8 mA), no Bi-CMOS speed/power balance | Unsuitable for 64 mA loads; requires level translation if interfacing legacy TTL | Select when supply flexibility matters more than drive strength; verify IOL/VOL under actual load |
Compared with SN74ACT540N and 74HC540PW, the 74BC540AFP-E uniquely balances TTL compatibility, strong drive, and integrated pull-ups - making it optimal for legacy system upgrades and industrial bus interfaces where input robustness and output strength are jointly essential.
Availability
74BC540AFP-E is available at Aetrix Electronics and suitable for industrial control systems, memory subsystems, and microcontroller peripheral expansion requiring stable component supply and long-term industrial temperature support.
Supply support for 74BC540AFP-E 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 is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, and logic devices for industrial, automotive, and infrastructure markets.
The HD74BC540A family was designed to replace high-power bipolar buffers in 5 V TTL systems, offering Bi-CMOS efficiency without sacrificing speed or drive strength.
FAQ
What is the logic function of the 74BC540AFP-E?
The 74BC540AFP-E is an octal inverting buffer with 3-state outputs: each input A1–A8 is inverted and appears at corresponding Y1–Y8 when both G1 and G2 are low. When either enable is high, all outputs enter high-impedance state. This behavior is confirmed in the function table and logic diagram on pages 2 and 3 of the official datasheet.
Does the 74BC540AFP-E require external pull-up resistors on unused inputs?
No - the 74BC540AFP-E includes built-in input pull-up circuits, allowing unused A pins to remain unconnected without risk of floating logic states. This feature is explicitly stated in the "Features" section and verified in the electrical characteristics table (II ≤ ±1.0 µA at VIN = 5.5 V).
What is the maximum output sink current specification for the 74BC540AFP-E?
The 74BC540AFP-E guarantees 64 mA sink current per output (IOL = 64 mA) while maintaining VOL ≤ 0.55 V at VCC = 4.5 V, as specified in the "Electrical Characteristics" table on page 4. This enables direct driving of multiple TTL loads or moderate capacitive buses.
Can the 74BC540AFP-E operate reliably at 4.5 V supply?
Yes - the 74BC540AFP-E is fully characterized down to 4.5 V (VCC min), with all parameters including VOH ≥ 2.4 V, VOL ≤ 0.55 V, and tPLH/tPHL ≤ 7.0 ns validated across –40°C to +85°C at this voltage, per the "Recommended Operating Conditions" and "Electrical Characteristics" tables.
Is the 74BC540AFP-E pin-compatible with standard 74LS540 or 74F540 devices?
No - although functionally similar, the 74BC540AFP-E uses a 20-pin SOP (FP-20DAV) package with different pin assignments (e.g., VCC at pin 1, GND at pin 20) versus the 20-pin DIP layout of 74LS540. PCB redesign is required; it is not a drop-in replacement.
74BC540AFP-E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
74BC540AFP-E FAQ
1.How can I place an order for 74BC540AFP-E through Aetrix?
Please submit a Request for Quotation (RFQ) for 74BC540AFP-E 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 74BC540AFP-E reliable?
The price and inventory of 74BC540AFP-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74BC540AFP-E is usually 5 days.
3.What payment methods are accepted for 74BC540AFP-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74BC540AFP-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74BC540AFP-E?
74BC540AFP-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74BC540AFP-E 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 74BC540AFP-E?
For technical support, including 74BC540AFP-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74BC540AFP-E requirements.
6.How does Aetrix verify that 74BC540AFP-E is sourced from the original manufacturer or authorized distributors?
All 74BC540AFP-E 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 74BC540AFP-E meets industry standards.
7.What is the process for return or replacement of 74BC540AFP-E?
All 74BC540AFP-E units undergo pre-shipment inspection (PSI). If there is an issue with 74BC540AFP-E, 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 74BC540AFP-E part is unused and in its original packaging.
Return procedure for 74BC540AFP-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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