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Texas Instruments SN74AS841ADWR
- Part No.:
- SN74AS841ADWR
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74AS841ADWR.pdf
- Description:
- BUS DRIVER, AS SERIES
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- Shipping:
Inventory:1,000
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Product details
Overview
SN74AS841ADWR from Texas Instruments is a 10-bit noninverting D-type latch with 3-state outputs, designed for bus-interface applications in TTL-compatible systems. It features 10 transparent latches, buffered OE and LE inputs, ±24 mA output drive capability at VCC = 5.5 V, and operates over 0°C to 70°C. It is used in bidirectional bus drivers and I/O port expansion where high-drive 3-state buffering is required.
For engineers reviewing the SN74AS841ADWR datasheet, SN74AS841ADWR pinout, SN74AS841ADWR application, or SN74AS841ADWR equivalent, key selection considerations include its 24-pin SOIC (DW) package, 1 ns minimum tPLH/tPHL propagation delay, 2.5 ns setup/hold timing, and compatibility with legacy 5-V TTL bus architectures requiring robust drive strength and bus isolation.
Technical Context
The SN74AS841ADWR implements ten independent D-type transparent latches with noninverting data paths and separate latch-enable (LE) and output-enable (OE) controls. Its internal logic allows data retention during OE deactivation while permitting new data capture on LE transitions.
It uses bipolar AS (Advanced Schottky) technology, delivering faster switching than ALS variants: tPLH/tPHL ≤ 6.5 ns (D→Q), tPLH/tPHL ≤ 12 ns (LE→Q), and tPZH/tPHZ ≤ 8 ns (OE→Q). All outputs enter high-impedance state when OE is high, independent of LE or data state.
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. |
| IOL / IOH | 48 mA sink / –24 mA source - Drives heavily loaded buses directly without external buffers or pull-ups. |
| Propagation Delay (D→Q) | 1–6.5 ns - Enables high-speed data latching in fast synchronous bus interfaces. |
| Setup/Hold Time | 2.5 ns each - Supports tight timing margins in high-frequency address/data strobing. |
| 3-State Enable/Disable Time | tPHZ/tPLZ ≤ 8 ns - Minimizes bus contention windows during output state transitions. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial-grade embedded and industrial control systems. |
| Input Voltage Thresholds | VIH = 2 V, VIL = 0.8 V - Fully compatible with standard TTL logic families. |
Pinout & Package
SN74AS841ADWR is housed in a 24-pin SOIC (DW) package with 300-mil body width and gull-wing leads. Pin spacing is 0.050 inch (1.27 mm), compliant with JEDEC MS-013.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 | Data Inputs (1D–10D) | Noninverting D inputs for ten transparent latches; accept TTL-level signals. |
| 11 | Latch Enable (LE) | Active-high control: enables transparent latching of D inputs to Q outputs. |
| 12 | GND | Ground reference for all internal circuitry and I/O. |
| 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 | Outputs (1Q–10Q) | 3-state buffered outputs; driven low/high or placed in high-Z per OE state. |
| 23 | VCC | Positive supply terminal (4.5–5.5 V); powers all latch and output stages. |
| 24 | Output Enable (OE) | Active-low control: disables all outputs into high-impedance state without affecting latch state. |
Key Features
| Feature | Design Value |
|---|---|
| 10-bit bus-interface latch | Provides full-width data latching for 10-bit address/data buses without external glue logic. |
| 3-state outputs with buffered OE | Reduces DC loading on control lines and prevents bus contention during multi-driver arbitration. |
| Power-up high-impedance state | Ensures safe bus initialization-outputs remain disabled until OE is actively asserted. |
| Bus-structured pinout | Groups D and Q pins contiguously (1–10 and 13–22), simplifying PCB routing and reducing trace skew. |
| AS-family speed grade | Delivers up to 2× faster propagation and tighter timing than ALS equivalents (e.g., SN74ALS841). |
Applications
| Microprocessor Bus Expansion | Legacy Industrial Backplane Interface |
|---|---|
|
Use Scenario: Extending 10-bit address or data bus width between CPU and peripheral ASICs in retro-computing or PLC backplanes. IC Role / Device Role / Timing Role: Acts as a transparent bus latch synchronized to LE strobe, holding data stable during bus turnaround cycles. Use Value: Eliminates need for discrete buffers or additional clock domain synchronization due to sub-7 ns D→Q delay and 2.5 ns timing margins. |
Use Scenario: Isolating and driving shared parallel I/O lines among multiple controllers in factory automation racks. IC Role / Device Role / Timing Role: Provides 3-state bus arbitration via OE, enabling time-multiplexed access to common sensor/actuator data lines. Use Value: 48 mA sink capability drives long traces and multiple TTL inputs directly; high-Z state prevents signal corruption during idle periods. |
| Memory Address Latching | Test Equipment Signal Conditioning |
|
Use Scenario: Capturing and holding upper address bits for EPROM or SRAM access in 8080/Z80-based systems. IC Role / Device Role / Timing Role: Latches address nibbles on LE edge; outputs held stable during memory read/write cycles. Use Value: Noninverting path preserves address bit polarity; 0.35 V VOL at 48 mA ensures noise margin >0.4 V under worst-case load. |
Use Scenario: Buffering and isolating digital stimulus/response signals in automated test fixtures with mixed-voltage DUTs. IC Role / Device Role / Timing Role: Serves as a programmable 10-bit I/O register, decoupling tester logic from DUT electrical loading. Use Value: Buffered OE/LE inputs reduce tester drive burden; power-up high-Z prevents spurious activation during fixture power sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus-interface latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS841DW | Slower propagation (≤13 ns D→Q), lower drive (24 mA sink), ALS bipolar process. | Acceptable where timing budget allows ≥10 ns margins and bus loads are lighter. | Lower power consumption (ICC ≤ 40 mA vs. 94 mA) but sacrifices speed and drive strength. |
| SN74AS841AN | Same logic and timing specs, but in 300-mil plastic DIP (NT) package. | Suitable for through-hole prototyping, breadboarding, or legacy board rework. | Not pin-compatible with SN74AS841ADWR due to different footprint; requires PCB redesign. |
Compared with SN74ALS841DW and SN74AS841AN, the SN74AS841ADWR delivers the highest speed and drive in a surface-mount package-critical for space-constrained, high-density bus interfaces where layout efficiency and signal integrity are prioritized over through-hole serviceability or ultra-low static current.
Availability
SN74AS841ADWR is available at Aetrix Electronics and suitable for microprocessor bus expansion, legacy industrial backplane interface, and memory address latching requiring stable component supply and long-term obsolescence management.
Supply support for SN74AS841ADWR 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 leader founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74AS841ADWR belongs to TI's legacy 74AS logic family-designed specifically for high-speed, high-drive 5-V TTL bus interfacing in systems demanding deterministic timing and robust noise immunity.
FAQ
What logic family does SN74AS841ADWR belong to, and how does it differ from 74ALS variants?
The SN74AS841ADWR belongs to the 74AS (Advanced Schottky) logic family. It differs from 74ALS by using higher-speed bipolar transistors and optimized drive circuitry, achieving up to 2× faster propagation delays (e.g., 6.5 ns max D→Q vs. 13 ns for SN74ALS841) and stronger output drive (±24 mA vs. ±2.6 mA). The SN74AS841ADWR retains TTL-compatible voltage thresholds and pinout but requires careful attention to increased ICC (up to 94 mA).
Does SN74AS841ADWR support hot insertion or live bus connection?
No-SN74AS841ADWR is not hot-swap rated. Its absolute maximum rating for voltage applied to a disabled 3-state output is 5.5 V, and it lacks built-in current limiting or slew-rate control for live insertion. Connecting or disconnecting while powered risks latch-up or damage if bus voltages exceed VCC or fall outside VI limits (–0.5 V to 7 V). System-level protection (e.g., series resistors, bus guards) is required for such use cases.
What is the function of the LE and OE pins on SN74AS841ADWR, and can they be tied together?
LE (pin 11) is active-high and controls data latching: when high, D inputs pass transparently to internal latch nodes; when low, stored data holds. OE (pin 24) is active-low and controls output state: when low, Q outputs drive high/low; when high, all Q pins go high-impedance. They serve independent functions and must not be tied together-doing so eliminates independent control of data capture versus bus release, violating the intended bus-arbitration sequence.
Is SN74AS841ADWR RoHS compliant, and what is its moisture sensitivity level?
Yes, SN74AS841ADWR is RoHS compliant (lead-free finish: NiPdAu over Cu leadframe). Its MSL rating is Level-1 (unlimited floor life at ≤30°C/85% RH), meaning it may be mounted without baking or special handling per JEDEC J-STD-020. This applies to the DW package variant shipped in tube packaging, confirmed in TI's official packaging addendum.
How does the power-up behavior of SN74AS841ADWR affect system initialization?
At power-up, SN74AS841ADWR outputs default to high-impedance regardless of OE or LE state-ensuring no bus contention during supply ramp. Internal latches retain undefined states until first valid LE transition, but outputs remain safely isolated. This behavior eliminates need for external reset sequencing or pull-up/pull-down networks on Q lines, simplifying boot-time reliability in multi-drop bus systems.
SN74AS841ADWR 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:
- -
SN74AS841ADWR FAQ
1.How can I place an order for SN74AS841ADWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS841ADWR 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 SN74AS841ADWR reliable?
The price and inventory of SN74AS841ADWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS841ADWR is usually 5 days.
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SN74AS841ADWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS841ADWR 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 SN74AS841ADWR?
For technical support, including SN74AS841ADWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS841ADWR requirements.
6.How does Aetrix verify that SN74AS841ADWR is sourced from the original manufacturer or authorized distributors?
All SN74AS841ADWR 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 SN74AS841ADWR meets industry standards.
7.What is the process for return or replacement of SN74AS841ADWR?
All SN74AS841ADWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS841ADWR, 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 SN74AS841ADWR part is unused and in its original packaging.
Return procedure for SN74AS841ADWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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