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Texas Instruments SN74ALS623ADWR
- Part No.:
- SN74ALS623ADWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS623ADWR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,525
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Product details
Overview
SN74ALS623ADWR from Texas Instruments is an octal bus transceiver with true logic output, 3-state outputs, and dual output-enable control (OEAB/OEBA) enabling bidirectional A↔B data flow in asynchronous bus systems. It operates at 4.5–5.5 V, supports 0°C to 70°C ambient, delivers 24 mA low-level output drive, and features 2–13 ns propagation delays for A↔B paths.
For engineers reviewing the SN74ALS623ADWR datasheet, SN74ALS623ADWR pinout, SN74ALS623ADWR application, or SN74ALS623ADWR equivalent, this device serves as a legacy-compatible, TTL-compatible bidirectional bus interface for industrial control backplanes, legacy computing data buses, and isolated I/O expansion where latch capability and bus isolation timing are critical.
Technical Context
The SN74ALS623ADWR implements a dual-enable 8-bit transceiver architecture with independent OEAB (A-to-B enable) and OEBA (B-to-A enable) inputs, allowing simultaneous bidirectional data transfer or bus latching when both enables are active. Its true-output logic and 3-state outputs eliminate signal contention during direction switching.
It uses ALS (Advanced Low-Power Schottky) bipolar technology, delivering TTL-compatible voltage thresholds (VIH = 2 V, VIL = 0.8 V), robust noise immunity (VIK = –1.2 V), and guaranteed 24 mA sink current per output at VOL ≤ 0.4 V - validated across 0°C to 70°C operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Type | True-output, non-inverting octal bus transceiver with 3-state outputs |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/LS bus systems |
| Output Drive | 24 mA sink (IOL), –15 mA source (IOH) - sufficient to drive multiple TTL loads |
| Propagation Delay | 2–13 ns (A↔B), 2–22 ns (enable-to-output) - supports >30 MHz bus toggle rates |
| Operating Temperature | 0°C to 70°C - qualified for commercial and industrial ambient environments |
| Input Thresholds | VIH = 2 V, VIL = 0.8 V - ensures reliable interfacing with standard TTL logic families |
| Bus Isolation | High-impedance 3-state outputs when OEAB and OEBA are high - prevents bus contention |
Pinout & Package
SN74ALS623ADWR is housed in a 20-pin SOIC (DW) package, 7.5 mm wide, 12.83 mm long, 2.65 mm max height, RoHS-compliant with NiPdAu lead finish and moisture sensitivity level (MSL) 1 (260°C reflow unlimited).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OEAB, OEBA | Active-low output-enable controls: OEAB enables A→B, OEBA enables B→A |
| 2–9 | A1–A8 | Input/output port A - connects to first 8-bit data bus |
| 11–18 | B1–B8 | Input/output port B - connects to second 8-bit data bus |
| 10 | GND | Ground reference for all logic and I/O circuits |
| 20 | VCC | +5 V supply rail - must be decoupled locally per best practice |
Key Features
| Feature | Design Value |
|---|---|
| Local bus-latch capability | Simultaneous assertion of OEAB and OEBA holds both A and B bus states without external latches |
| Dual-directional control | Independent OEAB/OEBA pins allow asymmetric enable timing - critical for handshaking protocols |
| TTL-compatible I/O | VIH/VIL, VOH/VOL, and IOL/IOH fully meet TTL specifications - ensures drop-in replacement in legacy designs |
| Bus isolation integrity | Outputs achieve >10⁹ Ω off-state impedance - prevents leakage-induced bus corruption during disable |
| ALS process reliability | Advanced Low-Power Schottky construction provides stable timing and reduced power vs. standard LS |
Applications
| Industrial Backplane Interface | Legacy Computing Data Bus |
|---|---|
Use Scenario: Interfacing microprocessor local bus to isolated peripheral expansion slots in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional data bridge between CPU address/data bus and modular I/O cards, with precise OE timing to avoid bus contention. Use Value: Enables hot-swap-safe bus isolation and deterministic 2–13 ns latency for real-time I/O response within 100 µs control cycles. |
Use Scenario: Extending 8-bit data paths between Z80 or 8085 CPU modules and memory-mapped peripherals in vintage computer replicas. IC Role / Device Role / Timing Role: True-logic transceiver providing synchronous A↔B data routing under discrete control signals (RD/WR, MREQ). Use Value: Maintains TTL-level compatibility and timing margins required for cycle-accurate execution on sub-10 MHz architectures. |
| Isolated I/O Expansion | Test Equipment Bus Coupling |
Use Scenario: Adding isolated digital I/O banks to embedded test fixtures where ground separation prevents noise coupling. IC Role / Device Role / Timing Role: Signal-level translator between controller-side logic and opto-isolated field-side bus, using OEAB/OEBA for direction arbitration. Use Value: Eliminates need for separate direction-control logic and reduces PCB footprint by integrating dual-enable latching. |
Use Scenario: Coupling GPIB or IEEE-488 bus segments to internal diagnostic logic in automated test equipment. IC Role / Device Role / Timing Role: High-fidelity bus repeater that preserves signal integrity and timing skew across segmented backplanes. Use Value: Delivers <13 ns max propagation delay and <22 ns max enable-to-output delay - essential for maintaining IEEE-488 setup/hold compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS623AN | Same logic function and specs, but in 20-pin PDIP (N) package - through-hole mounting, no reflow constraints | Preferred for prototyping, manual assembly, or legacy board repair where SOIC footprint is unavailable | Select when mechanical fit, hand-soldering, or socket compatibility is required over surface-mount density |
| SN74AS623 | Faster propagation (1–9 ns vs. 2–13 ns) and higher drive (64 mA IOL), but increased ICC (up to 189 mA) and different input leakage (–0.75 mA IIL) | Suitable for high-speed backplanes requiring tighter timing margins, but demands stricter power delivery and thermal management | Choose only when speed gain justifies higher power, cost, and layout complexity - not a direct drop-in replacement |
Compared with SN74ALS623AN, SN74ALS623ADWR offers superior board-space efficiency and reflow compatibility; compared with SN74AS623, it trades speed for lower power and broader legacy system compatibility - making it optimal for stable, cost-sensitive industrial bus interfaces.
Availability
SN74ALS623ADWR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy computing data buses, and isolated I/O expansion requiring stable component supply across extended production lifecycles.
Supply support for SN74ALS623ADWR 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 with broad industrial and automotive qualification.
SN74ALS623ADWR belongs to TI's legacy ALS logic family, designed specifically for robust, pin-compatible upgrades of 74LS-series bus interfaces in commercial and industrial systems requiring proven reliability and long-term availability.
FAQ
What is the operating voltage range for SN74ALS623ADWR?
The SN74ALS623ADWR operates over a supply voltage range of 4.5 V to 5.5 V. This range ensures full compatibility with standard 5 V TTL and ALS logic families while maintaining specified timing, drive strength, and noise margin performance across the entire 0°C to 70°C temperature range. Operation outside this range may result in undefined behavior or permanent damage.
Does SN74ALS623ADWR support bus latching functionality?
Yes, SN74ALS623ADWR supports local bus-latch capability. When both OEAB and OEBA are asserted low simultaneously, the device enters a transparent latched state where each output reinforces its corresponding input - allowing both A and B buses to retain their last valid logic states without external storage elements. This feature is explicitly documented in the functional description and timing diagrams of the official datasheet.
What is the maximum propagation delay for data transfer in SN74ALS623ADWR?
The maximum propagation delay for SN74ALS623ADWR is 13 ns for A-to-B or B-to-A data paths under recommended conditions (VCC = 4.5–5.5 V, CL = 50 pF). The worst-case enable-to-output delay (tPZH/tPLZ) is 22 ns. These values are measured per JEDEC-standard load conditions and are guaranteed across the full 0°C to 70°C operating temperature range.
Can SN74ALS623ADWR replace SN74LS623 in existing designs?
Yes, SN74ALS623ADWR is a direct functional and pin-compatible upgrade for SN74LS623. It maintains identical pinout, logic function, voltage thresholds, and timing behavior while offering improved speed (reduced tPLH/tPHL), lower power consumption, and enhanced noise immunity due to ALS process advantages. No PCB or firmware changes are required for substitution.
What package type is used for SN74ALS623ADWR?
SN74ALS623ADWR uses a 20-pin SOIC (DW) package - a surface-mount, gull-wing leaded outline measuring 7.5 mm × 12.83 mm with 1.27 mm pitch and 2.65 mm maximum height. It is RoHS-compliant, has NiPdAu lead finish, and carries MSL Level-1 rating for unlimited floor life and 260°C reflow compatibility.
SN74ALS623ADWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 15mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ALS623ADWR FAQ
1.How can I place an order for SN74ALS623ADWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS623ADWR 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 SN74ALS623ADWR reliable?
The price and inventory of SN74ALS623ADWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS623ADWR is usually 5 days.
3.What payment methods are accepted for SN74ALS623ADWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS623ADWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS623ADWR?
SN74ALS623ADWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS623ADWR 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 SN74ALS623ADWR?
For technical support, including SN74ALS623ADWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS623ADWR requirements.
6.How does Aetrix verify that SN74ALS623ADWR is sourced from the original manufacturer or authorized distributors?
All SN74ALS623ADWR 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 SN74ALS623ADWR meets industry standards.
7.What is the process for return or replacement of SN74ALS623ADWR?
All SN74ALS623ADWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS623ADWR, 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 SN74ALS623ADWR part is unused and in its original packaging.
Return procedure for SN74ALS623ADWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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