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onsemi 74ACT16541SSC
- Part No.:
- 74ACT16541SSC
- Manufacturer:
- onsemi
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
74ACT16541SSC.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,904
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Product details
Overview
74ACT16541SSC from Fairchild Semiconductor is a 16-bit non-inverting buffer/line driver with dual-byte 3-STATE outputs, designed for memory/address bus driving and clock distribution in TTL-compatible systems. It operates from 4.5V to 5.5V, delivers ±24 mA output drive, supports −40°C to +85°C industrial temperature range, and features separate OE1/OE2 control for independent 8-bit byte enable.
For engineers reviewing the 74ACT16541SSC datasheet, pinout, applications, or equivalent options, key selection criteria include byte-level 3-STATE control, 5.2 ns typical propagation delay (CL = 50 pF), ±24 mA drive capability, TTL-compatible input thresholds, and SSOP-48 package compatibility with JEDEC MO-118.
Technical Context
The 74ACT16541SSC implements two independent 8-bit non-inverting buffer sections, each with dedicated active-low Output Enable (OE1, OE2) inputs controlling high-impedance state on its respective output group (O0–O7 and O8–O15). Inputs accept TTL-level voltages (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), and outputs are fully compatible with TTL and CMOS loads.
Its AC performance includes 5.2 ns typical tPLH/tPHL propagation delay, 5.0 ns typical tPZH/tPZL enable time, and 5.6 ns typical tPHZ/tPLZ disable time under 50 pF load. Power dissipation capacitance is 30 pF, supporting low dynamic power in high-speed bus applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across standard 5 V TTL supply tolerances. |
| Output Drive | ±24 mA - Sufficient to drive 10 LSTTL loads or terminate short PCB traces without external buffers. |
| Propagation Delay | 5.2 ns typ (CL = 50 pF) - Enables reliable operation in 100+ MHz address/data bus timing budgets. |
| 3-STATE Enable Time | 5.0 ns typ - Minimizes bus turnaround latency during bidirectional data transfers. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - Guarantees robust noise margin with legacy TTL and mixed-signal interfaces. |
| Operating Temp | −40°C to +85°C - Qualified for industrial-grade embedded control and instrumentation environments. |
| Power Dissipation Cap | 30 pF - Predictable dynamic power consumption for thermal modeling in dense logic layouts. |
Pinout & Package
74ACT16541SSC is housed in a 48-lead Small Shrink Outline Package (SSOP), JEDEC MO-118 compliant, 0.300" wide, with 0.025" pitch and exposed pad not present. Package number: MS48A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | I0–I7 | Byte 0 data inputs - Accept TTL/CMOS logic levels; directly connect to microcontroller port or memory address lines. |
| 9, 10 | OE1, OE2 | Active-low byte enable controls - Independent gating of O0–O7 (OE1) and O8–O15 (OE2); tied together for full 16-bit mode. |
| 11–18 | O0–O7 | Byte 0 3-STATE outputs - High-drive, rail-to-rail capable outputs; enter Z-state when OE1 = HIGH. |
| 19, 20, 21, 22, 23, 24, 25, 26 | I8–I15 | Byte 1 data inputs - Electrically identical to I0–I7; support parallel expansion or dual-bus segmentation. |
| 27–34 | O8–O15 | Byte 1 3-STATE outputs - Match O0–O7 timing and drive; enable/disable independently via OE2. |
| 35, 36 | VCC, GND | Power and ground - Decoupling capacitor (0.1 µF) required per VCC pin for noise suppression in high-speed switching. |
| 37–48 | NC | No-connect pins - Not internally bonded; must remain unconnected per datasheet guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Independent byte control | Separate OE1/OE2 inputs allow concurrent or staggered enable of two 8-bit buses-critical for memory interleaving or dual-processor arbitration. |
| ±24 mA output drive | Eliminates need for external line drivers in 5 V backplane or motherboard trace routing up to 10 cm. |
| TTL-compatible inputs | Accepts standard 0.8 V / 2.0 V thresholds without level-shifting-enables direct interfacing with legacy 74LS/74ALS logic families. |
| Low propagation skew | Matched tPLH/tPHL ensures <0.5 ns inter-output skew across all 16 channels-preserves setup/hold timing in synchronous bus designs. |
| JEDEC MO-118 SSOP | Industry-standard 48-pin SSOP footprint enables drop-in replacement in existing PCB layouts using similar ACT/AC logic devices. |
Applications
| Memory Address Buffering | Microcontroller Bus Expansion |
|---|---|
Use Scenario: Driving 16-bit address bus from an 8-bit microcontroller with external RAM/ROM. IC Role / Device Role / Timing Role: Non-inverting buffer with byte-selectable 3-STATE outputs isolates CPU address lines from memory device inputs while enabling shared bus access. Use Value: Enables deterministic address decoding with 5.2 ns propagation delay and ±24 mA drive-reducing signal integrity risk on 10 cm PCB traces. | Use Scenario: Expanding GPIO count via parallel I/O port using dual 8-bit data latches. IC Role / Device Role / Timing Role: Bidirectional bus transceiver substitute-OE1/OE2 control allows direction switching without external direction logic. Use Value: Eliminates need for discrete direction-control gates; 5.0 ns enable time supports 100 MHz burst-mode peripheral access. |
| Clock Distribution Network | Industrial PLC Backplane Interface |
Use Scenario: Fan-out of system clock to multiple synchronous peripherals (ADC, DAC, FPGA config). IC Role / Device Role / Timing Role: Low-skew, high-drive clock buffer-each output replicates input with matched delay and edge integrity. Use Value: Maintains <0.5 ns inter-channel skew across 16 outputs, preserving setup/hold margins for multi-device synchronous sampling. | Use Scenario: Isolating field I/O modules from central controller bus in modular PLC chassis. IC Role / Device Role / Timing Role: Byte-controlled bus driver-OE1/OE2 coordinate module addressing and data transfer handshaking over shared backplane. Use Value: Supports hot-swap-safe 3-STATE isolation and −40°C to +85°C operation-meeting EN 61000-6-2 industrial immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit buffer/line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74AC16541SSC | AC family: lower ICC (1.5 mA max), higher speed (tPLH = 3.5 ns typ), but reduced noise margin (VIH = 3.15 V min at VCC = 5 V). | Better for low-power, high-frequency designs where TTL input compatibility is not required. | Select when optimizing for speed/power trade-off and interfacing exclusively with CMOS logic. |
| SN74LVCH16541APAG | LVCH family: 3.3 V only (VCC = 1.65–3.6 V), bus-hold inputs, higher drive (±24 mA), but no 5 V tolerance. | Suitable for modern 3.3 V systems with mixed-voltage I/O; incompatible with 5 V buses. | Choose for 3.3 V embedded systems requiring bus-hold protection and lower supply voltage operation. |
Compared with 74AC16541SSC and SN74LVCH16541APAG, the 74ACT16541SSC uniquely balances 5 V TTL compatibility, industrial temperature range, and byte-level 3-STATE control-making it optimal for legacy industrial controllers and mixed-voltage board upgrades where input threshold robustness is critical.
Availability
74ACT16541SSC is available at Aetrix Electronics and suitable for memory address buffering, microcontroller bus expansion, and clock distribution applications requiring stable component supply, long-term industrial availability, and JEDEC-compliant SSOP packaging.
Supply support for 74ACT16541SSC 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 analog and power IC manufacturer, acquired by ON Semiconductor in 2016; its ACT logic portfolio remains widely supported in industrial design.
The 74ACT16541SSC belongs to the Advanced CMOS Technology (ACT) logic family, engineered for high-speed, TTL-compatible 5 V digital interface applications with enhanced noise immunity and drive strength.
FAQ
What is the maximum output current rating for the 74ACT16541SSC?
The 74ACT16541SSC is rated for ±24 mA DC output source/sink current per pin under guaranteed operating conditions (VCC = 4.5–5.5 V, TA = −40°C to +85°C). This value is confirmed in the DC Electrical Characteristics table of the official Fairchild datasheet DS500300, and supports driving 10 LSTTL loads without degradation. Exceeding this limit risks parametric shift or latch-up.
Does the 74ACT16541SSC support 3.3 V operation?
No, the 74ACT16541SSC is specified only for 4.5 V to 5.5 V supply operation per its Recommended Operating Conditions. Applying 3.3 V violates the minimum VCC requirement and results in undefined logic behavior, insufficient noise margin, and failure to meet VOH/VOL specifications. For 3.3 V systems, consider SN74LVCH16541APAG instead.
How are the OE1 and OE2 pins used in the 74ACT16541SSC?
In the 74ACT16541SSC, OE1 controls the 3-STATE state of outputs O0–O7, and OE2 controls O8–O15. Both are active-low: outputs go to high impedance when the respective OE is HIGH, and pass inverted input data when LOW. They may be tied together for unified 16-bit control or driven separately for byte-granular bus arbitration-enabling flexible memory banking or peripheral multiplexing.
Is the 74ACT16541SSC pin-compatible with other 48-pin SSOP logic buffers?
The 74ACT16541SSC uses JEDEC MO-118 compliant 48-pin SSOP (package MS48A) with standardized pinout for 16-bit dual-byte buffers. It shares footprint and pin function with 74AC16541SSC and 74F16541SSC, but not with non-byte-controlled variants like 74ACT16244. Always verify pin mapping against specific datasheets before substitution.
What is the typical propagation delay of the 74ACT16541SSC at 5 V?
The typical propagation delay (tPLH/tPHL) of the 74ACT16541SSC is 5.2 ns at VCC = 5.0 V with CL = 50 pF, as specified in the AC Electrical Characteristics table of DS500300. This value applies uniformly across all 16 channels and is measured under standard load conditions-supporting reliable timing closure in 100 MHz synchronous bus designs.
74ACT16541SSC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ACT
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
74ACT16541SSC FAQ
1.How can I place an order for 74ACT16541SSC through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT16541SSC 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 74ACT16541SSC reliable?
The price and inventory of 74ACT16541SSC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT16541SSC is usually 5 days.
3.What payment methods are accepted for 74ACT16541SSC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT16541SSC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT16541SSC?
74ACT16541SSC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT16541SSC 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 74ACT16541SSC?
For technical support, including 74ACT16541SSC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT16541SSC requirements.
6.How does Aetrix verify that 74ACT16541SSC is sourced from the original manufacturer or authorized distributors?
All 74ACT16541SSC 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 74ACT16541SSC meets industry standards.
7.What is the process for return or replacement of 74ACT16541SSC?
All 74ACT16541SSC units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT16541SSC, 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 74ACT16541SSC part is unused and in its original packaging.
Return procedure for 74ACT16541SSC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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