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Texas Instruments SN74ALS29841NT
- Part No.:
- SN74ALS29841NT
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ALS29841NT.pdf
- Description:
- BUS DRIVER, ALS SERIES
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Inventory:174
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Product details
Overview
SN74ALS29841NT from Texas Instruments is a 10-bit noninverting transparent D-type latch with 3-state outputs, designed for bus driving in address/data paths with parity. It operates at 4.75–5.25 V, delivers ±48 mA output drive, and features power-up high-impedance state. Used in I/O ports and bidirectional bus drivers in industrial control backplanes.
For engineers reviewing the SN74ALS29841NT datasheet, SN74ALS29841NT pinout, SN74ALS29841NT application, or SN74ALS29841NT equivalent, key selection criteria include bus-structured 24-pin DIP package, OE/LE dual-control timing, 9.5 ns max propagation delay (CL = 50 pF), and ALS family compatibility with TTL-level inputs and 3.3 V–5 V system interfacing.
Technical Context
This device implements ten independent D-type latches with noninverting data paths and separate latch-enable (LE) and output-enable (OE) controls. LE governs data transparency and storage; OE independently places all outputs in high-impedance without affecting internal latch states.
It uses bipolar ALS (Advanced Low-Power Schottky) technology, delivering higher speed and lower power than standard LS logic. The buffered OE and LE inputs reduce DC loading on upstream drivers, and the outputs remain high-impedance during power-up/down-critical for hot-swap and bus arbitration scenarios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.75 V to 5.25 V - Ensures stable operation across standard 5 V supply tolerances in legacy industrial systems. |
| IOH / IOL | −24 mA / +48 mA - Sufficient drive strength to directly interface with multiple TTL loads or capacitive buses up to 300 pF. |
| tPLH / tPHL (D→Q) | 2 ns to 9.5 ns (CL = 50 pF) - Supports high-speed bus cycles in 8086/8088-era microprocessor systems and memory-mapped peripherals. |
| tPZH / tPLZ (OE→Q) | 14 ns to 23 ns (CL = 50–300 pF) - Enables precise bus turn-around timing for bidirectional data transfers without contention. |
| VIH / VIL | 2.0 V / 0.8 V - Compatible with standard TTL input thresholds, allowing direct connection to 74LS/74ALS logic without level-shifting. |
| Operating Temp | 0°C to 70°C - Qualified for commercial-grade embedded systems including test equipment and programmable logic controllers. |
Pinout & Package
SN74ALS29841NT is supplied in a 24-pin plastic DIP (300-mil) package (NT suffix), with bus-structured pinout optimized for PCB layout efficiency in parallel bus architectures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 | Data Inputs (1D–10D) | Noninverting D inputs for each of ten transparent latches; accept standard TTL logic levels. |
| 11 | Latch Enable (LE) | Active-high control: when high, data passes through; when low, latched value holds regardless of D input changes. |
| 12 | GND | Ground reference for all logic and output stages; must be low-impedance for noise immunity. |
| 13 | Output Enable (OE) | Active-low control: when low, outputs drive; when high, all Q pins enter high-impedance state. |
| 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 | Outputs (1Q–10Q) | 3-state buffered outputs capable of sourcing/sinking up to 48 mA; isolated during OE high or power-down. |
| 24 | VCC | +5 V supply rail; requires local 0.1 µF ceramic decoupling adjacent to pin for transient current stability. |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | Minimizes trace crossovers on dense backplane layouts-data inputs on one side, outputs on opposite side, control on center. |
| Power-up high-impedance state | Prevents bus contention during system reset or cold start, eliminating need for external pull-ups or sequenced enable logic. |
| Buffered OE and LE inputs | Reduces DC loading on upstream drivers by >5× vs. unbuffered equivalents-extends fan-out capability in cascaded control trees. |
| Independent OE/LE control | Allows data retention in latches while outputs are disabled-enables safe read-modify-write operations on shared buses. |
Applications
| Microprocessor Address Latching | Parallel I/O Port Expansion |
|---|---|
Use Scenario: Latching 10-bit segment address lines from an 8086/8088 CPU during memory access cycles. IC Role / Device Role / Timing Role: Transparent latch holding address bits stable during ALE deassertion; OE synchronized to memory read/write strobes. Use Value: Eliminates need for discrete buffers and timing glue logic-reduces component count and propagation skew in ISA-style bus designs. | Use Scenario: Expanding GPIO capability in an industrial PLC using a parallel peripheral interface. IC Role / Device Role / Timing Role: Bidirectional data register buffering between microcontroller port and external sensors/actuators via shared data bus. Use Value: Provides 10-bit wide, direction-controlled I/O with hardware-enforced bus isolation-prevents signal contention during mode switching. |
| Parity Bus Interface | Legacy Backplane Data Buffering |
Use Scenario: Driving parity check bits onto a 16-bit data bus alongside main data path in telecom line cards. IC Role / Device Role / Timing Role: Dedicated parity bit latch synchronized to main data latch enable, with independent OE for parity-only enable. Use Value: Enables concurrent parity generation and transmission without adding latency to primary data path-supports real-time error detection. | Use Scenario: Isolating and strengthening signals on a VMEbus or Multibus II backplane with long trace runs and high capacitance. IC Role / Device Role / Timing Role: High-drive 3-state buffer for address or control lines, with OE controlled by slot-select decoding logic. Use Value: Compensates for >100 pF bus loading and maintains signal integrity over 12-inch traces-avoids timing violations in multi-slot chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AS29841N | Faster propagation (tPLH/tPHL ≤ 5.5 ns @ CL=50 pF) but higher ICC (110 mA typical); AS family, not ALS. | Better suited for high-speed timing-critical paths; less suitable for low-power or thermally constrained boards. | Select when speed > 8 ns is required and power budget allows ≥25% increase in supply current. |
| SN74F29841N | Standard F-series: tPLH/tPHL ≤ 7 ns, ICC ≈ 75 mA, VIH/VIL identical; no power-up Hi-Z guarantee per datasheet. | Compatible pinout and voltage specs, but lacks guaranteed high-impedance at power-up-requires external reset coordination. | Acceptable where board-level power sequencing ensures OE is held high until VCC stabilizes. |
Compared with SN74ALS29841NT, SN74AS29841N trades higher speed for increased power and thermal load, while SN74F29841N offers cost-effective timing performance but removes the critical power-up Hi-Z safety feature essential for uncontrolled power domains.
Availability
SN74ALS29841NT is available at Aetrix Electronics and suitable for industrial control backplanes, legacy microprocessor support circuits, and parallel I/O expansion requiring stable component supply and long-lifecycle obsolescence management.
Supply support for SN74ALS29841NT 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
Texas Instruments is a U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ALS29841NT belongs to TI's legacy Advanced Low-Power Schottky (ALS) logic family, engineered for high-speed, low-power bus interfacing in commercial-grade computing and control systems of the 1980s–1990s.
FAQ
What is the function of the LE and OE pins on the SN74ALS29841NT?
The LE (Latch Enable) pin controls data transparency: when high, inputs pass through to outputs; when low, outputs hold the last latched value. The OE (Output Enable) pin independently controls output state: low enables drive, high forces all outputs into high-impedance. In SN74ALS29841NT, OE does not affect internal latch operation-data can be updated while outputs remain disabled.
Does the SN74ALS29841NT have guaranteed high-impedance on power-up?
Yes. The SN74ALS29841NT enters a high-impedance state on all Q outputs during power-up and power-down, regardless of OE or LE state. This behavior is explicitly characterized in the datasheet and prevents bus contention in systems lacking strict power sequencing-making SN74ALS29841NT suitable for hot-plug-capable backplanes.
What is the maximum capacitive load the SN74ALS29841NT can drive reliably?
The SN74ALS29841NT is characterized for CL = 50 pF and CL = 300 pF loads, with specified timing parameters up to 300 pF. Its ±48 mA output drive supports stable edge rates on heavily loaded buses. For reliable operation beyond 300 pF, external series termination or reduced slew rate design practices are recommended-SN74ALS29841NT itself does not include slew-rate control.
Is the SN74ALS29841NT RoHS compliant?
No. Per TI's Packaging Information Addendum, SN74ALS29841NT is marked "OBSOLETE" with Eco Plan listed as "TBD", indicating no Pb-Free (RoHS) conversion was implemented. It contains leaded solder and leaded die attach, consistent with 1990s-era commercial DIP packaging. Aetrix Electronics supplies only fully traceable, original TI-manufactured SN74ALS29841NT units meeting original spec.
Can the SN74ALS29841NT be used in place of the SN74ALS29841DW?
Yes-SN74ALS29841NT and SN74ALS29841DW share identical logic functionality, timing, and DC specifications. They differ only in package: NT is 24-pin PDIP, DW is SOIC-24. Pinout is identical. However, SN74ALS29841NT's DIP package provides easier prototyping and socket-based replacement in legacy systems where the SN74ALS29841NT is specified.
SN74ALS29841NT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- 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:
- -
SN74ALS29841NT FAQ
1.How can I place an order for SN74ALS29841NT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS29841NT 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 SN74ALS29841NT reliable?
The price and inventory of SN74ALS29841NT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS29841NT is usually 5 days.
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4.How is shipping managed for SN74ALS29841NT?
SN74ALS29841NT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS29841NT 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 SN74ALS29841NT?
For technical support, including SN74ALS29841NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS29841NT requirements.
6.How does Aetrix verify that SN74ALS29841NT is sourced from the original manufacturer or authorized distributors?
All SN74ALS29841NT 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 SN74ALS29841NT meets industry standards.
7.What is the process for return or replacement of SN74ALS29841NT?
All SN74ALS29841NT units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS29841NT, 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 SN74ALS29841NT part is unused and in its original packaging.
Return procedure for SN74ALS29841NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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