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onsemi 74ABT541CMSAX
- Part No.:
- 74ABT541CMSAX
- Manufacturer:
- onsemi
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74ABT541CMSAX.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,674
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Product details
Overview
74ABT541CMSAX from Fairchild Semiconductor is an octal non-inverting buffer/line driver with dual active-low 3-STATE outputs, designed for memory and address bus driving, clock distribution, and bidirectional bus interfacing. It operates at 4.5V–5.5V, delivers 64mA sink / 32mA source drive strength, and guarantees pin-to-pin skew ≤2.3ns (HL) under 250pF load - enabling high-speed, low-noise data transmission in industrial control backplanes.
For engineers reviewing the 74ABT541CMSAX datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed simultaneous switching performance, hot-insertion capability, flow-through pinout layout compatibility, and verified 3-STATE bus contention avoidance via tPZH < tPHZ timing margin.
Technical Context
The 74ABT541CMSAX implements TTL-compatible input thresholds (VIH = 2.0V, VIL = 0.8V) and ABT-series BiCMOS output stages optimized for high-current transient drive into capacitive loads up to 250pF. Its dual independent OE1/OE2 controls allow partitioned bus enable logic across two 4-bit groups.
Propagation delay is specified across temperature (–40°C to +85°C), supply (4.5V–5.5V), and load conditions (50pF and 250pF), with guaranteed skew metrics (tOSHL ≤ 2.3ns, tOST ≤ 3.5ns) ensuring deterministic timing in multi-driver systems. Disable time (tPHZ/tPLZ) is intentionally longer than enable time (tPZH/tPZL) to prevent bus contention during state transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +4.5V to +5.5V - ensures compatibility with standard 5V TTL/CMOS systems and noise margin against rail droop. |
| Output Drive | 64mA sink / 32mA source - supports direct driving of heavy capacitive buses (e.g., 250pF) without external buffers. |
| Propagation Delay | 1.0–3.6ns (CL = 50pF) - enables >100MHz toggle frequency in point-to-point configurations. |
| Pin-to-Pin Skew | ≤2.3ns (HL, CL = 250pF) - maintains signal integrity across all eight outputs during parallel data transfers. |
| 3-STATE Enable/Disable | tPZH ≤ 6.0ns, tPHZ ≤ 6.1ns - ensures glitch-free bus release with built-in timing margin to avoid contention. |
| Input Thresholds | VIH = 2.0V, VIL = 0.8V - provides robust noise immunity in mixed-voltage or noisy industrial environments. |
| Hot-Insertion | Nondestructive - allows safe insertion/removal while VCC is active, critical for modular backplane systems. |
Pinout & Package
74ABT541CMSAX is housed in a 20-lead Shrink Small Outline Package (SSOP), JEDEC MO-150, 5.3mm wide, with gull-wing leads and 0.65mm pitch - optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | I0–I7 Inputs | Non-inverting data inputs; accept TTL/CMOS logic levels; internally clamped to –1.2V (VIK). |
| 9, 19 | OE1, OE2 | Active-low output enable controls for two independent 4-bit groups; both must be LOW for output assertion. |
| 10, 11, 12, 13, 15, 16, 17, 18 | O0–O7 Outputs | 3-STATE buffered outputs; high-impedance when OE1/OE2 HIGH; capable of 64mA sink current. |
| 14 | GND | Ground reference for all I/O and internal circuitry; decoupling capacitor placement critical for noise suppression. |
| 20 | VCC | +4.5V to +5.5V power supply; requires local 0.1µF ceramic bypass capacitor near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Input pins on one side (1–8), outputs on opposite side (10–13, 15–18), minimizing trace crossovers and improving SI in dense routing. |
| Guaranteed output skew | tOSHL ≤ 2.3ns (250pF) - ensures synchronized edge alignment across all eight drivers for parallel bus integrity. |
| Disable-before-enable timing | tPHZ > tPZH by ≥0.1ns - eliminates bus contention during output state transitions without external sequencing logic. |
| High-impedance power-up/down | Glitch-free 3-STATE during entire VCC ramp - prevents spurious bus loading or latchup during system power sequencing. |
| Latchup protection | Rated to ±500mA I/O current - meets JEDEC JESD78 Class II requirements for robustness in industrial transients. |
Applications
| Memory Address Buffering | Industrial Backplane Interface |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM/Flash devices on a shared bus. IC Role / Device Role / Timing Role: Non-inverting octal buffer providing level-shifting, fanout expansion, and noise-immune signal integrity. Use Value: Guaranteed 64mA sink per output ensures reliable low-VOL (≤0.55V) even under full 250pF bus capacitance and worst-case process corner. |
Use Scenario: Interfacing PLC CPU modules with I/O expansion cards via a 24V-tolerant, hot-pluggable backplane. IC Role / Device Role / Timing Role: Bidirectional bus driver enabling isolated module insertion/removal without system reset. Use Value: Nondestructive hot-insertion capability and high-impedance power-cycle behavior prevent bus glitches during live card swaps. |
| High-Speed Clock Distribution | Legacy Bus Transceiver Support |
|
Use Scenario: Distributing a 50MHz system clock to four synchronous peripherals with matched edge timing. IC Role / Device Role / Timing Role: Low-skew clock buffer with deterministic propagation delay and minimal duty-cycle distortion. Use Value: tPS ≤ 3.5ns (duty-cycle skew) and tPV ≤ 3.5ns (device-to-device skew) maintain <1% jitter accumulation across eight outputs. |
Use Scenario: Adapting legacy ISA or VMEbus signals between 3.3V and 5V domains with direction control and bus isolation. IC Role / Device Role / Timing Role: Unidirectional line driver supporting 3-STATE arbitration and hot-swap-safe bus release. Use Value: Dual OE inputs allow independent gating of upper/lower byte lanes, enabling partial bus updates without full cycle stalls. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-STATE buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT244N | 20-pin DIP package; identical ABT core, but broadside pinout (inputs/outputs interleaved) vs. flow-through in 74ABT541CMSAX. | Less optimal for high-density PCB routing; no SSOP option; higher thermal resistance. | Prefer 74ABT541CMSAX for space-constrained, automated SMT designs requiring minimized trace length and skew. |
| 74LVT244MTCX | Lower voltage operation (2.7V–3.6V); LVT logic family; 32mA drive only; not 5V-tolerant. | Requires level translation when interfacing with 5V buses; unsuitable for direct replacement in legacy 5V systems. | Select 74ABT541CMSAX where 5V compatibility, higher drive strength, and guaranteed 250pF load support are mandatory. |
Compared with SN74ABT244N and 74LVT244MTCX, the 74ABT541CMSAX uniquely combines flow-through SSOP packaging, 64mA sink capability, and guaranteed 250pF skew performance - making it the preferred choice for new 5V industrial backplane and memory interface designs demanding layout efficiency and timing determinism.
Availability
74ABT541CMSAX is available at Aetrix Electronics and suitable for industrial control backplanes, memory subsystem buffering, and high-reliability 5V bus interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74ABT541CMSAX 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. Its ABT-series logic remains widely deployed in industrial and automotive systems.
The 74ABT541CMSAX belongs to Fairchild's Advanced BiCMOS Technology (ABT) logic family - engineered for high-speed, high-drive 5V TTL-compatible applications with enhanced noise immunity and bus integrity in electrically harsh environments.
FAQ
What is the maximum capacitive load supported by the 74ABT541CMSAX while maintaining guaranteed timing specs?
The 74ABT541CMSAX guarantees AC performance up to 250pF per output, including propagation delay (tPLH/tPHL ≤ 8.5ns), skew (tOSHL ≤ 2.3ns), and toggle frequency (fTOGGLE ≥ 100MHz). This is explicitly validated in the Extended AC Electrical Characteristics table for CL = 250pF, 8-output switching - confirming suitability for heavily loaded backplane or ribbon-cable interfaces without derating.
Does the 74ABT541CMSAX support hot-swap operation, and what design features enable this?
Yes, the 74ABT541CMSAX supports nondestructive hot-insertion, enabled by three integrated features: (1) high-impedance, glitch-free outputs during full power-up/down cycles, (2) latchup protection rated to ±500mA I/O current, and (3) input clamp diodes with VIH/VIL thresholds that remain valid across VCC ramp. These ensure safe insertion into live 5V buses without damaging the device or corrupting bus data.
How does the dual OE architecture of the 74ABT541CMSAX improve bus control compared to single-OE octal buffers?
The 74ABT541CMSAX uses two independent active-low OE inputs (OE1, OE2) controlling separate 4-bit groups (I0–I3/O0–O3 and I4–I7/O4–O7). This allows partial bus gating - e.g., disabling only the upper byte during a write cycle - reducing dynamic power and avoiding unnecessary bus contention. Unlike single-OE parts, it eliminates the need for external logic to split enable signals.
What is the significance of the "disable time less than enable time" specification for the 74ABT541CMSAX?
The datasheet specifies tPHZ/tPLZ > tPZH/tPZL - meaning disable time exceeds enable time. This intentional asymmetry ensures outputs fully enter high-impedance *before* new data is driven onto the bus, preventing momentary short-circuits or bus contention during state transitions. For the 74ABT541CMSAX, tPHZ min = 1.7ns vs. tPZH max = 6.0ns, providing ≥0.1ns guaranteed margin under worst-case conditions.
Is the 74ABT541CMSAX pin-compatible with other packages in the same family, such as the SOIC or TSSOP variants?
Yes - all 74ABT541 variants (74ABT541CSC, 74ABT541CSJ, 74ABT541CMSA, 74ABT541CMTC) share identical 20-pin functional pinouts per JEDEC MO-150 (SSOP), MO-153 (TSSOP), MS-013 (SOIC), and EIAJ TYPE II (SOP) standards. Pin numbering, signal assignment (I0–I7, O0–O7, OE1/OE2, VCC, GND), and electrical behavior are fully consistent - enabling drop-in substitution across packages based solely on board space and thermal requirements.
74ABT541CMSAX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ABT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
74ABT541CMSAX FAQ
1.How can I place an order for 74ABT541CMSAX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT541CMSAX 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 74ABT541CMSAX reliable?
The price and inventory of 74ABT541CMSAX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT541CMSAX is usually 5 days.
3.What payment methods are accepted for 74ABT541CMSAX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT541CMSAX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ABT541CMSAX?
74ABT541CMSAX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT541CMSAX 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 74ABT541CMSAX?
For technical support, including 74ABT541CMSAX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT541CMSAX requirements.
6.How does Aetrix verify that 74ABT541CMSAX is sourced from the original manufacturer or authorized distributors?
All 74ABT541CMSAX 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 74ABT541CMSAX meets industry standards.
7.What is the process for return or replacement of 74ABT541CMSAX?
All 74ABT541CMSAX units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT541CMSAX, 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 74ABT541CMSAX part is unused and in its original packaging.
Return procedure for 74ABT541CMSAX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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