SN74LS541NS Texas Instruments In Stock
SN74LS541NS is a 8-bit octal buffer and line driver with 3-state outputs by Texas Instruments, featuring non-inverting outputs and two active-low output-enable controls. Key specs: 5 V TTL-compatible logic, 8 channels, 24 mA sink current output, and typical propagation delay of 12 ns. Available in a 20-pin SOIC package, in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- —
- Lifecycle
- ACTIVE
- Datasheet
- N/A
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 8-channel non-inverting 3-state buffer for 8-bit bus driving
- Dual active-low output-enable inputs for flexible bus control
- TTL-compatible 5 V logic with 24 mA output sink current
- Typical propagation delay of 12 ns for fast bus arbitration
- 20-pin SOIC package compatible with standard bus-width PCB layouts
- Low-power Schottky (LS) family for reduced power dissipation vs. standard TTL
Applications
The SN74LS541NS is used as an 8-bit bus buffer and line driver in microprocessor memory address and data bus systems where multiple devices share a common 5 V TTL bus and bus isolation is required. Its 3-state output capability allows multiple SN74LS541NS devices to be connected in parallel on an 8-bit backplane without bus contention, supporting designs in industrial controllers, legacy computing boards, and signal routing applications. Test and measurement equipment and EPROM programmer circuits also use this device to drive high-capacitance PCB traces with the required 24 mA drive strength.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN74LS541NS:
Frequently Asked Questions
How do the two output-enable pins on the SN74LS541NS support bus multiplexing in 8-bit systems?
The SN74LS541NS has 2 independent active-low output-enable (OE) pins that must both be asserted low to enable all 8 output channels simultaneously. In bus multiplexing schemes, one OE can be tied to an address decoder output and the other to a bus grant signal, allowing the device to drive a 5 V TTL 8-bit bus only when both conditions are met, preventing bus contention between multiple drivers sharing the same 8 data lines.
What output drive capability does the SN74LS541NS provide for driving long PCB traces?
Each of the 8 output channels can sink up to 24 mA and source approximately 15 mA, which is sufficient to drive TTL-level loads on board traces up to 20 cm long at standard 5 V logic levels without exceeding the low-level output voltage of 0.5 V. The LS family's output structure also reduces high-frequency ringing on heavily loaded bus traces compared to standard bipolar TTL, as the Schottky transistors switch cleanly within the typical 12 ns propagation delay.
Is the SN74LS541NS a suitable buffer for interfacing a 5 V microprocessor to an 8-bit EPROM data bus?
Yes, the SN74LS541NS is a classic choice for buffering a 5 V microprocessor data bus to an 8-bit EPROM or SRAM, because its non-inverting 3-state outputs with 24 mA drive strength overcome the capacitive load of long PCB traces and multiple EPROM chip-select inputs. The dual OE inputs allow the buffer to be enabled only during valid read cycles, isolating the processor bus from the memory bus during write or DMA cycles and preventing data bus corruption.
When would a designer prefer the SN74LS541NS over the SN74LS244 in a bus buffer application?
Both are 8-bit 3-state buffers, but the SN74LS541NS has all 8 channels in a flow-through pinout where inputs enter from one side and outputs exit the other, simplifying PCB routing for 8-bit parallel data paths. The SN74LS244 splits its 8 channels into two 4-bit groups with separate OE controls, which is preferred when independent 4-bit nibble enabling is needed; the SN74LS541NS with its single-row 8-bit path and 5 V, 24 mA drive is preferred for straightforward full-byte bus isolation and line driving.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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