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onsemi 74ABT541CPC
- Part No.:
- 74ABT541CPC
- Manufacturer:
- onsemi
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
74ABT541CPC.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,802
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Product details
Overview
74ABT541CPC from Fairchild Semiconductor is an octal non-inverting buffer/line driver with 3-STATE outputs in a 20-pin PDIP package, designed for memory and address bus driving, clock distribution, and bidirectional bus interfacing. It operates from 4.5 V to 5.5 V, delivers 64 mA sink and 32 mA source output drive, and guarantees low skew (≤2.0 ns) and simultaneous switching performance under 50 pF and 250 pF loads.
For engineers reviewing the 74ABT541CPC datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 3-STATE disable timing (tPZL ≤ 6.0 ns), high-noise-immunity dynamic input thresholds (VIHD ≥ 1.4 V, VILD ≤ 1.1 V), and latchup protection compliant with JEDEC JESD78.
Technical Context
The 74ABT541CPC implements dual active-low output enable controls (OE1, OE2) enabling independent gating of two 4-bit groups, supporting flexible bus partitioning. Its ABT logic family ensures TTL-compatible input thresholds and fast propagation delays (tPLH/tPHL ≤ 3.6 ns at 50 pF).
It features flow-through pinout architecture-inputs on one side, outputs on the opposite-reducing PCB trace crossovers. The device maintains high-impedance bus integrity during power-up/down cycles and supports nondestructive hot insertion per JEDEC JESD78 Class II.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +4.5 V to +5.5 V - Ensures compatibility with 5 V TTL and CMOS systems without level-shifting. |
| Output Drive | 64 mA sink / 32 mA source - Drives heavy capacitive loads (e.g., 250 pF buses) and multiple TTL inputs directly. |
| Propagation Delay | ≤3.6 ns (CL = 50 pF) - Enables reliable operation up to 100 MHz toggle frequency in point-to-point routing. |
| Pin-to-Pin Skew | ≤2.0 ns (tOST) - Minimizes timing uncertainty across all eight outputs for synchronous bus applications. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - Matches standard TTL logic levels for seamless interface with legacy controllers. |
| 3-STATE Disable Time | tPLZ ≤ 5.6 ns - Prevents bus contention during output disable transitions in multi-driver systems. |
| Latchup Immunity | ±500 mA - Meets JEDEC JESD78 Class II, ensuring robustness against transient current injection. |
Pinout & Package
74ABT541CPC uses a 20-lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" wide body (Package Number N20A). Pin spacing is 0.100", row spacing is 0.300", and lead finish is matte tin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | I0–I7 Inputs | Non-inverting data inputs; accept TTL-level signals; internally terminated with clamp diodes. |
| 9, 19 | OE1, OE2 | Active-low output enables; both must be LOW to activate outputs; independent control of two 4-bit groups. |
| 11, 12, 13, 14, 15, 16, 17, 18 | O0–O7 Outputs | 3-STATE buffered outputs; high-drive capability supports direct connection to unterminated transmission lines. |
| 10 | GND | Ground reference for all I/O and internal circuitry; decoupling capacitor placement critical for noise immunity. |
| 20 | VCC | Positive supply rail; requires local 0.1 µF ceramic bypass capacitor adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Inputs (pins 1–8) and outputs (pins 11–18) arranged on opposite sides - simplifies layer routing and reduces vias in dense PCB layouts. |
| Guaranteed simultaneous switching | Validated for 8-output switching under 250 pF load - ensures deterministic timing in high-speed bus drivers without derating. |
| Glitch-free power sequencing | Outputs remain high-impedance throughout full VCC ramp (−40°C to +85°C) - prevents spurious bus loading during power-up/down. |
| Hot-insertion capable | Nondestructive operation when inserted into live backplanes - enabled by bus-hold immunity and controlled I/O discharge paths. |
| Disable-before-enable priority | tPZH > tPZL (enable slower than disable) - eliminates bus contention during state transitions in multi-driver configurations. |
Applications
| Memory Address Buffering | Microprocessor Bus Driver |
|---|---|
Use Scenario: Driving 16-bit address bus from microcontroller to SRAM or EPROM in industrial control PLCs. IC Role / Device Role / Timing Role: Non-inverting buffer with 3-STATE control isolates CPU from memory during DMA cycles. Use Value: 64 mA sink drive ensures signal integrity across 10 cm traces; guaranteed skew ≤2.0 ns maintains setup/hold margins at 25 MHz. |
Use Scenario: Interfacing 8-bit data bus between MCU and peripheral ICs (e.g., UART, ADC) in embedded instrumentation. IC Role / Device Role / Timing Role: Bidirectional line driver enabling shared bus arbitration via OE1/OE2 control. Use Value: Independent OE pins allow selective activation of upper/lower nibbles; tPZL ≤ 6.0 ns prevents data corruption during bus handoff. |
| Clock Distribution Network | Legacy System Bus Interface |
Use Scenario: Fan-out of system clock (5–25 MHz) to multiple synchronous peripherals in test equipment. IC Role / Device Role / Timing Role: Low-skew buffer delivering matched delay to eight destinations. Use Value: tOSLH ≤ 1.8 ns (250 pF) ensures < ±100 ps inter-channel jitter - critical for setup time compliance in synchronous logic. |
Use Scenario: Bridging ISA or PC/104 bus segments in retro-computing or military COTS upgrades. IC Role / Device Role / Timing Role: Level-translating and load-driving interface between 5 V TTL subsystems. Use Value: VIH/VIL thresholds match legacy TTL; 32 mA source drive sustains voltage under 10-unit load conditions per IEEE Std 625. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT244N | Same ABT family, identical electrical specs, but broadside pinout (inputs/outputs interleaved); no flow-through layout. | Requires PCB redesign due to different pin mapping; unsuitable for drop-in replacement in existing 74ABT541CPC layouts. | Select only if board revision allows re-routing; otherwise retain 74ABT541CPC for layout continuity. |
| 74LVT244PW | Lower VCC range (2.7–3.6 V); 32 mA drive only; not 5 V tolerant; different AC timing (tPLH ≈ 3.8 ns @ 50 pF). | Not compatible with 5 V systems; requires level-shifting or supply change; unsuitable for legacy 5 V bus designs. | Use only in new 3.3 V designs where power efficiency outweighs 5 V interoperability. |
Compared with SN74ABT244N and 74LVT244PW, the 74ABT541CPC uniquely combines flow-through pinout, 5 V operation, and guaranteed 250 pF load timing - making it the preferred choice for retrofitting or maintaining legacy 5 V bus architectures without layout changes.
Availability
74ABT541CPC is available at Aetrix Electronics and suitable for memory address buffering, microprocessor bus interfacing, and clock distribution requiring stable component supply across industrial temperature ranges (−40°C to +85°C) and long-lifecycle programs.
Supply support for 74ABT541CPC 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 ABT logic family targeted high-speed, noise-immune digital interfacing.
The 74ABT541CPC belongs to Fairchild's Advanced BiCMOS Technology (ABT) logic series, engineered for robust 5 V bus driving in industrial and computing environments where timing predictability and ESD resilience are critical.
FAQ
What is the maximum capacitive load supported by the 74ABT541CPC while maintaining guaranteed timing?
The 74ABT541CPC guarantees AC performance up to 250 pF per output, with specified propagation delays (tPLH/tPHL ≤ 6.0 ns) and skew (tOST ≤ 3.5 ns) under that load. This enables direct driving of long traces or multiple TTL inputs without external termination. For 74ABT541CPC, operation beyond 250 pF may degrade timing margins and is not characterized in the datasheet.
Does the 74ABT541CPC support hot-plug operation in live backplane systems?
Yes, the 74ABT541CPC supports nondestructive hot insertion per JEDEC JESD78 Class II requirements, verified by ±500 mA latchup immunity and controlled I/O discharge paths. During hot insertion, its high-impedance state remains stable, and inputs tolerate overvoltage transients up to 7.0 V - critical for safe deployment in modular 74ABT541CPC-based backplane designs.
How does the dual output enable (OE1 and OE2) function in the 74ABT541CPC?
In the 74ABT541CPC, OE1 controls outputs O0–O3 and OE2 controls O4–O7. Both must be LOW for their respective group to drive; either HIGH places its group in high-impedance. This allows independent bus segmentation - for example, using OE1 to gate address bits A0–A3 and OE2 for A4–A7 in memory-mapped I/O decoding schemes.
Is the 74ABT541CPC pin-compatible with other 74-series octal buffers like the 74LS244?
No, the 74ABT541CPC is not pin-compatible with 74LS244. While both are 20-pin PDIP octal buffers, the 74ABT541CPC uses a flow-through pinout (I0–I7 on left, O0–O7 on right), whereas 74LS244 has interleaved inputs/outputs. Substituting 74ABT541CPC for 74LS244 requires PCB redesign - confirmed by JEDEC MS-001 footprint compatibility but incompatible pin mapping.
What is the recommended bypass capacitor for the 74ABT541CPC VCC pin?
A 0.1 µF ceramic capacitor placed within 5 mm of the 74ABT541CPC VCC (pin 20) and GND (pin 10) is mandatory to suppress high-frequency supply noise and ensure stable 3-STATE transitions. Additional bulk capacitance (e.g., 10 µF tantalum) is advised near the power entry point for systems with multiple 74ABT541CPC devices sharing the same rail.
74ABT541CPC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ABT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
74ABT541CPC FAQ
1.How can I place an order for 74ABT541CPC through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT541CPC 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 74ABT541CPC reliable?
The price and inventory of 74ABT541CPC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT541CPC is usually 5 days.
3.What payment methods are accepted for 74ABT541CPC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT541CPC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ABT541CPC?
74ABT541CPC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT541CPC 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 74ABT541CPC?
For technical support, including 74ABT541CPC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT541CPC requirements.
6.How does Aetrix verify that 74ABT541CPC is sourced from the original manufacturer or authorized distributors?
All 74ABT541CPC 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 74ABT541CPC meets industry standards.
7.What is the process for return or replacement of 74ABT541CPC?
All 74ABT541CPC units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT541CPC, 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 74ABT541CPC part is unused and in its original packaging.
Return procedure for 74ABT541CPC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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