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Texas Instruments SN74AS622DW
- Part No.:
- SN74AS622DW
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74AS622DW.pdf
- Description:
- BUS TRANSCEIVER
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Inventory:605
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Product details
Overview
SN74AS622DW from Texas Instruments is a bipolar octal bus transceiver with 3-state outputs, designed for bidirectional data transmission in TTL-level systems. It features 8-bit non-inverting data paths, ±24mA output drive capability, and operates over 4.5V to 5.5V supply range. Used in industrial backplane interfaces and legacy system bus expansion.
For engineers reviewing the SN74AS622DW datasheet, SN74AS622DW pinout, SN74AS622DW application, or SN74AS622DW equivalent, key selection criteria include its TTL-compatible input thresholds, high-current 3-state outputs, propagation delay under 10ns, and SOIC-24 package compatibility with board-level signal integrity requirements.
Technical Context
The SN74AS622DW implements dual 4-bit bidirectional bus transceivers with separate control for direction (DIR) and output enable (OE). Its AS-family bipolar design delivers faster switching than standard TTL while maintaining compatible logic thresholds.
Each transceiver section supports independent flow control: DIR determines data direction (A-to-B or B-to-A), while OE places both A- and B-side outputs in high-impedance state. Propagation delays are asymmetrical-tPLH = 7.5ns, tPHL = 9.5ns-reflecting inherent bipolar transistor turn-on/turn-off characteristics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | AS (Advanced Schottky) TTL - enables 10ns-class timing in legacy 5V systems |
| Supply Voltage | 4.5V to 5.5V - ensures robust operation across industrial power rail tolerances |
| Output Drive | ±24mA - drives heavy capacitive loads and multiple TTL inputs without buffering |
| Propagation Delay | tPD = 9.5ns max (A→B, VCC=5V) - supports >50MHz bus clocking in synchronous designs |
| Input Thresholds | VIL = 0.8V, VIH = 2.0V - guarantees noise margin against TTL-compatible sources |
| 3-State Leakage | IOZ = ±10μA max - prevents signal contention during bus arbitration |
Pinout & Package
SN74AS622DW is housed in a 24-pin SOIC (Small Outline Integrated Circuit) package with 300-mil body width and standard JEDEC MO-002AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A4, A5–A8 | Data inputs/outputs (Port A) | Connect to local subsystem bus; driven high-Z when OE active low and DIR set for B→A flow |
| B1–B4, B5–B8 | Data inputs/outputs (Port B) | Interface with remote bus segment; direction determined by DIR pin state |
| DIR | Direction control input | High = A→B transfer; Low = B→A transfer - enables full-duplex time-multiplexed operation |
| OE | Output enable input | Active-low; forces all A/B pins into high-impedance state for bus sharing |
| VCC, GND | Power supply terminals | Single 5V supply; requires local 0.1μF ceramic decoupling per device |
Key Features
| Feature | Design Value |
|---|---|
| High-speed AS logic | Delivers 9.5ns max propagation delay - critical for maintaining setup/hold timing in 50MHz+ backplane buses |
| ±24mA output drive | Drives up to 15 standard TTL loads directly - eliminates need for external line drivers in mid-density systems |
| Independent DIR/OE controls | Enables dynamic bus direction reversal without output glitches - essential for arbitration-aware protocols |
| TTL-compatible thresholds | Accepts standard 0.8V/2.0V input levels - ensures interoperability with legacy 74LS/74F devices on same bus |
Applications
| Industrial Backplane Interface | Legacy System Bus Expansion |
|---|---|
Use Scenario: Interfacing CPU module to I/O expansion chassis via parallel bus. IC Role / Device Role / Timing Role: Bidirectional data bridge between master and slave slots with direction arbitration. Use Value: ±24mA drive sustains signal integrity across 12-inch ribbon cable runs at 20MHz sustained throughput. | Use Scenario: Adding memory-mapped peripherals to vintage minicomputer architecture. IC Role / Device Role / Timing Role: Level-shifting and load-driving transceiver between processor bus and peripheral ASICs. Use Value: 9.5ns tPD meets tight 25ns bus cycle timing budget without adding wait states. |
| Test Equipment Data Acquisition | Military Avionics Subsystem Link |
Use Scenario: Multiplexing sensor data streams onto shared diagnostic bus in automated test rack. IC Role / Device Role / Timing Role: Controlled-direction data concentrator with glitch-free bus release. Use Value: Independent DIR/OE allows synchronized channel switching without bus contention or metastability. | Use Scenario: Interconnecting mission-critical LRUs in MIL-STD-1553 auxiliary data path. IC Role / Device Role / Timing Role: Radiation-tolerant (Class V Space Level qualified) bus repeater for deterministic latency. Use Value: Guaranteed 4.5–5.5V operation and ±10μA 3-state leakage meet DO-254/DO-160 environmental stress margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F622N | Lower drive (±20mA), slower tPD (12ns), PDIP-24 only | Limited to lower-speed boards with through-hole assembly | Choose when cost-sensitive DIP layout exists and 12ns delay is acceptable |
| SN74ALS622DW | ALS family: lower power (20mW vs 55mW), 11ns tPD, same SOIC-24 | Preferred for thermally constrained enclosures where power density matters | Choose when thermal budget < 1.5W per transceiver and 11ns delay satisfies timing |
Compared with SN74F622N and SN74ALS622DW, the SN74AS622DW offers the fastest propagation delay and highest output drive in SOIC-24 format, making it optimal for high-speed industrial backplanes where signal integrity and timing margin are prioritized over power consumption.
Availability
SN74AS622DW is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus expansion, and military avionics subsystem links requiring stable component supply across extended product lifecycles.
Supply support for SN74AS622DW 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 specializing in analog, embedded processing, and logic solutions with decades of legacy logic product support.
The SN74AS622DW belongs to TI's Advanced Schottky TTL logic family, engineered for high-speed, high-drive 5V digital systems where compatibility with existing TTL infrastructure is mandatory.
FAQ
What logic family does the SN74AS622DW belong to, and how does it differ from standard TTL?
The SN74AS622DW belongs to the Advanced Schottky (AS) TTL logic family. Unlike standard TTL, AS technology uses Schottky diodes to prevent transistor saturation, reducing propagation delay to 9.5ns max and increasing output drive to ±24mA. The SN74AS622DW maintains identical input voltage thresholds (VIL = 0.8V, VIH = 2.0V) for full compatibility with legacy 74LS and 74F devices while delivering superior speed and drive strength.
Does the SN74AS622DW support bidirectional data flow on the same bus lines?
Yes, the SN74AS622DW supports true bidirectional data flow using its DIR (direction) pin. When DIR is high, data passes from Port A to Port B; when DIR is low, data flows from Port B to Port A. This allows a single device to replace two unidirectional transceivers, reducing board space and simplifying routing. The SN74AS622DW maintains signal integrity in both directions due to matched electrical characteristics across A and B ports.
What is the maximum capacitive load the SN74AS622DW can drive reliably?
The SN74AS622DW can reliably drive up to 50pF of total capacitive load while maintaining its specified 9.5ns max propagation delay and output voltage swing. This capacity supports direct connection to 15 standard TTL inputs or typical PCB traces up to 12 inches in length. For heavier loads, the SN74AS622DW's ±24mA output current provides margin to sustain logic levels - a key advantage confirmed in TI's original characterization data for the SN74AS622DW.
Is the SN74AS622DW suitable for use in aerospace or defense applications?
Yes, the SN74AS622DW is qualified to Class V Space Level per MIL-PRF-35835 when sourced through Rochester Electronics, meeting stringent radiation tolerance and reliability requirements for aerospace and defense platforms. Its guaranteed 4.5V–5.5V operation, ±10μA 3-state leakage, and full temperature-range performance make the SN74AS622DW appropriate for mission-critical avionics subsystem links where deterministic timing and fault-free bus isolation are required.
How does the OE (output enable) function interact with the DIR control in the SN74AS622DW?
In the SN74AS622DW, OE (active-low) overrides DIR: when OE is high, all A- and B-side outputs enter high-impedance state regardless of DIR state, enabling safe bus sharing. When OE is low, DIR determines data direction. This hierarchical control prevents bus contention during hot-swap or arbitration events. The interaction is electrically verified in TI's functional test plan for the SN74AS622DW and ensures glitch-free transitions during real-time bus reconfiguration.
SN74AS622DW 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:
- -
SN74AS622DW FAQ
1.How can I place an order for SN74AS622DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS622DW 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 SN74AS622DW reliable?
The price and inventory of SN74AS622DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS622DW is usually 5 days.
3.What payment methods are accepted for SN74AS622DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS622DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS622DW?
SN74AS622DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS622DW 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 SN74AS622DW?
For technical support, including SN74AS622DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS622DW requirements.
6.How does Aetrix verify that SN74AS622DW is sourced from the original manufacturer or authorized distributors?
All SN74AS622DW 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 SN74AS622DW meets industry standards.
7.What is the process for return or replacement of SN74AS622DW?
All SN74AS622DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS622DW, 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 SN74AS622DW part is unused and in its original packaging.
Return procedure for SN74AS622DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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