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Texas Instruments SN74ALS29841DW
- Part No.:
- SN74ALS29841DW
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ALS29841DW.pdf
- Description:
- BUS DRIVER, ALS SERIES
- Quantity:
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- Shipping:
Inventory:542
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Product details
Overview
SN74ALS29841DW from Texas Instruments is a 10-bit transparent D-type latch with noninverting 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 SN74ALS29841DW datasheet, SN74ALS29841DW pinout, SN74ALS29841DW application, or SN74ALS29841DW equivalent, key selection factors include bus-structured SOIC-24 pinout, 9.5 ns max propagation delay (CL = 50 pF), guaranteed 0°C to 70°C operation, and ALS-family logic compatibility with TTL-level inputs.
Technical Context
This device implements ten independent transparent latches with buffered LE (latch-enable) and OE (output-enable) controls. LE governs data capture timing with 2.5 ns setup and 4.5 ns hold times; OE independently places all outputs in high-impedance without affecting internal latch states.
The SN74ALS29841DW uses bipolar ALS (Advanced Low-Power Schottky) technology, delivering higher drive strength than standard LS logic while maintaining compatible input thresholds. Its bus-structured pinout minimizes trace crossovers in dense PCB layouts for parallel bus interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky) - ensures TTL-compatible input levels and improved noise margin over standard LS. |
| Supply Voltage | 4.75 V to 5.25 V - supports stable operation across standard 5 V ±5% rails in industrial systems. |
| Output Drive | −24 mA (high), +48 mA (low) - sufficient to directly drive 50-pF bus loads without external buffers or pull-ups. |
| Propagation Delay | Max 9.5 ns (D→Q, CL = 50 pF) - enables reliable timing in 100+ MHz bus cycles with margin. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems including test equipment and computing peripherals. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - ensures robust recognition of TTL logic levels under voltage variation. |
| Power-Up State | Outputs default to high-impedance - prevents bus contention during system reset or power sequencing. |
Pinout & Package
SN74ALS29841DW is housed in a 24-pin plastic small-outline integrated circuit (SOIC) package (DW suffix), 300-mil width, with standard JEDEC MS-013AC footprint and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low control: asserts high-impedance on all Q outputs when high; no effect on internal latch state. |
| 2–11 | 1D–10D | Noninverting data inputs - latch transparently when LE is high; data held when LE goes low. |
| 12 | GND | Ground reference for logic and power - must be low-impedance connection to minimize noise coupling. |
| 13 | VCC | +5 V supply - bypassing with 0.1 µF ceramic capacitor near pin required for stable switching. |
| 14–23 | 1Q–10Q | 3-state noninverting outputs - drive bus lines directly; enter high-Z when OE = high or during power transition. |
| 24 | LE (Latch Enable) | Active-high control: enables transparency of D→Q path; latches data on falling edge (synchronous capture). |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | Alternating D/Q pins per side reduce PCB routing congestion and crosstalk in parallel bus implementations. |
| Buffered control inputs (OE, LE) | Reduces DC loading on upstream drivers - allows fanout to multiple SN74ALS29841DW devices without buffer amplification. |
| Power-up high-impedance state | Eliminates bus contention at power-on - critical for hot-swap-capable or multi-master backplane designs. |
| Extra bus-driving latches | Supports wider address/data paths (e.g., 10-bit parity extension) without requiring additional discrete latches or glue logic. |
| ALS process technology | Delivers 2× speed and 50% lower power vs. standard LS - improves timing margin in legacy 5 V systems. |
Applications
| Industrial Backplane I/O Port | Legacy Computing Address Latch |
|---|---|
|
Use Scenario: Isolating microprocessor address/data buses from peripheral expansion slots in programmable logic controllers. IC Role / Device Role / Timing Role: 10-bit transparent latch buffers address lines with parity; LE synchronized to CPU ALE signal for cycle-accurate capture. Use Value: Enables direct connection of 10-bit wide bus segments without level-shifting or buffering, reducing component count and board area. |
Use Scenario: Holding 10-bit memory-mapped I/O addresses in vintage PC/AT-style expansion cards. IC Role / Device Role / Timing Role: Acts as address latch during early bus cycle phase; OE controlled by ISA IOR/IOW# to isolate bus during data transfer. Use Value: Provides deterministic 9.5 ns D→Q delay and guaranteed high-Z on power-up - prevents spurious writes during boot. |
| Test Equipment Signal Conditioning | Parallel Data Acquisition Interface |
|
Use Scenario: Buffering and isolating digital stimulus signals in automated test equipment (ATE) channel cards. IC Role / Device Role / Timing Role: Latches pattern generator outputs before driving DUT interface; OE used for channel enable/disable sequencing. Use Value: ±48 mA drive capability drives long traces and capacitive fixtures directly; bus-structured pinout simplifies layout for 10-channel modules. |
Use Scenario: Capturing parallel outputs from 10-bit ADCs in real-time data loggers or oscilloscope front-ends. IC Role / Device Role / Timing Role: Synchronizes ADC conversion results into system bus using LE edge-triggered capture; OE manages bus arbitration. Use Value: High-impedance outputs prevent loading of shared data bus during acquisition; ALS speed supports >10 MHz sampling rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AS29841DW | Faster propagation (5.5 ns typ), higher ICC (110 mA), same pinout and function - AS family offers speed upgrade with increased power draw. | Preferred where timing margin is critical and power budget allows; not drop-in due to higher supply current and thermal requirements. | Select SN74AS29841DW only if design requires sub-7 ns D→Q delay and can accommodate higher quiescent current. |
| SN74LS29841N | Same logic function and pinout, but in PDIP-24 (NT package); slower (15 ns max), lower drive (±20 mA), higher power consumption. | Suitable for prototyping or through-hole legacy systems; lacks SOIC thermal and density advantages of SN74ALS29841DW. | Choose SN74LS29841N only for hand-soldered prototypes or replacement in existing DIP-based boards. |
Compared with SN74AS29841DW and SN74LS29841N, the SN74ALS29841DW delivers optimal balance of speed (9.5 ns), drive strength (±48 mA), and power efficiency (85 mA max ICC) in surface-mount form - making it the preferred choice for space-constrained, production-ready 5 V bus interfaces.
Availability
SN74ALS29841DW is available at Aetrix Electronics and suitable for industrial backplane I/O ports, legacy computing address latching, and test equipment signal conditioning requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS29841DW 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 global semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ALS29841DW belongs to TI's legacy ALS logic product line, engineered for high-speed, low-power 5 V TTL-compatible bus interfacing in industrial control and computing infrastructure.
FAQ
What is the operating temperature range for the SN74ALS29841DW?
The SN74ALS29841DW is characterized for operation from 0°C to 70°C. This commercial-grade temperature range is validated per TI's recommended operating conditions and applies to all electrical specifications including propagation delay, output drive, and input thresholds. The device is not rated for extended industrial (−40°C to 85°C) or automotive temperature ranges.
Does the SN74ALS29841DW support true bidirectional bus operation?
The SN74ALS29841DW does not implement internal direction control like a transceiver; however, its independent OE and LE controls enable bidirectional bus usage when paired with complementary devices. For example, one SN74ALS29841DW can drive address lines while another handles data - both sharing the same bus with OE coordinated to avoid contention.
What is the maximum capacitive load the SN74ALS29841DW can drive reliably?
The SN74ALS29841DW is specified for CL = 50 pF and CL = 300 pF in its switching characteristics table, with propagation delays up to 16 ns at 300 pF. Its ±48 mA output drive supports direct connection to typical PCB traces and stubs totaling ≤300 pF, provided proper VCC decoupling and ground integrity are maintained.
Is the SN74ALS29841DW pin-compatible with other 10-bit latches in the 74xx family?
Yes - the SN74ALS29841DW shares identical pinout and function with SN74AS29841DW and SN74LS29841N, including D/Q ordering, OE/LE placement, and power/ground positions. This allows direct substitution within the same package type, though electrical parameters (speed, drive, power) differ across families.
How does the power-up high-impedance feature of the SN74ALS29841DW improve system reliability?
The SN74ALS29841DW outputs remain in high-impedance during power-up and power-down transitions, preventing unintended bus contention or signal corruption when VCC ramps. This eliminates need for external reset sequencing or pull-up/down resistors on Q lines - a critical advantage in multi-board backplane systems where power timing skew is unavoidable.
SN74ALS29841DW 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:
- -
SN74ALS29841DW FAQ
1.How can I place an order for SN74ALS29841DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS29841DW 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 SN74ALS29841DW reliable?
The price and inventory of SN74ALS29841DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS29841DW is usually 5 days.
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4.How is shipping managed for SN74ALS29841DW?
SN74ALS29841DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS29841DW 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 SN74ALS29841DW?
For technical support, including SN74ALS29841DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS29841DW requirements.
6.How does Aetrix verify that SN74ALS29841DW is sourced from the original manufacturer or authorized distributors?
All SN74ALS29841DW 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 SN74ALS29841DW meets industry standards.
7.What is the process for return or replacement of SN74ALS29841DW?
All SN74ALS29841DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS29841DW, 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 SN74ALS29841DW part is unused and in its original packaging.
Return procedure for SN74ALS29841DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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