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Texas Instruments SN74ALS623ANSR
- Part No.:
- SN74ALS623ANSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ALS623ANSR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,653
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Product details
Overview
SN74ALS623ANSR from Texas Instruments is an octal bus transceiver with true logic output, 3-state bidirectional operation, and dual output-enable control (OEAB/OEBA) enabling asynchronous A↔B data flow in industrial and legacy computing buses. It operates from 4.5 V to 5.5 V, supports 0°C to 70°C ambient, and delivers 24 mA low-level output drive for TTL-compatible interfacing.
For engineers reviewing the SN74ALS623ANSR datasheet, SN74ALS623ANSR pinout, SN74ALS623ANSR application, or SN74ALS623ANSR equivalent, this device serves as a legacy-compatible, non-inverting 8-bit bus isolator with latch capability, precise timing control, and SOP-20 packaging optimized for space-constrained PCB layouts.
Technical Context
The SN74ALS623ANSR implements dual independent enable logic: OEAB controls A→B transmission while OEBA controls B→A transmission, allowing full bidirectional isolation or simultaneous bidirectional latching when both enables are active. Its ALS (Advanced Low-Power Schottky) process ensures compatibility with standard TTL voltage thresholds and fan-out requirements.
It features true (non-inverting) logic path between A and B ports, 3-state outputs with fast enable/disable times (tPZH/tPLZ ≤ 22 ns), and propagation delays of 2–13 ns (A↔B) under 50 pF load. All I/O pins tolerate up to 5.5 V input, and absolute maximum VCC is 7 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across standard 5 V supply rails with ±5% tolerance. |
| Logic Type | True (non-inverting) - Preserves signal polarity across A↔B bus paths without inversion overhead. |
| IOL / IOH | 24 mA / –15 mA - Drives standard TTL loads directly; sufficient for 10-unit fan-out at 5 V. |
| tPLH / tPHL | 2–13 ns - Enables high-speed bus arbitration in legacy microprocessor systems (e.g., Z80, 8080). |
| Operating Temp | 0°C to 70°C - Qualified for commercial-grade embedded and industrial control applications. |
| Output Type | 3-state (tri-state) - Allows multiple devices to share common bus lines without contention. |
| Package | SOP-20 (NS) - Surface-mount, 24.4 mm tape-and-reel format (2000 pcs/reel); footprint compatible with SOIC-20 but thinner profile. |
Pinout & Package
SOP-20 (NS) package: 20-pin small-outline plastic package, 1.27 mm pitch, 13.0 mm body width, 7.6 mm body length, max height 2.65 mm. RoHS-compliant, NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OEAB) | Output Enable A→B | Active-low control: enables A-port drivers to drive B bus; high = high-Z A outputs. |
| 2–9 (A1–A8) | A-side Data Inputs/Outputs | Bidirectional I/O pins connected to A bus; driven by internal transceivers when enabled. |
| 10 (GND) | Ground Reference | Primary power return path for all logic and I/O circuits; must be low-impedance. |
| 11–18 (B1–B8) | B-side Data Inputs/Outputs | Bidirectional I/O pins connected to B bus; driven by internal transceivers when enabled. |
| 19 (OEBA) | Output Enable B→A | Active-low control: enables B-port drivers to drive A bus; high = high-Z B outputs. |
| 20 (VCC) | Positive Supply | 5 V nominal power rail; decoupling capacitor required near pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent output enables | OEAB and OEBA allow asymmetric bus control-e.g., A→B only, B→A only, or isolated state-without external logic. |
| Local bus-latch capability | Simultaneous assertion of OEAB and OEBA holds both A and B buses in last valid state, eliminating need for external latches. |
| True (non-inverting) logic path | Eliminates signal polarity correction in A↔B data routing, reducing design complexity in backplane or memory-mapped I/O systems. |
| ALS process technology | Delivers TTL-compatible speed/power trade-off: faster than LS, lower power than AS, with robust noise immunity. |
| 3-state bus isolation | High-impedance outputs prevent bus contention during multi-master arbitration or hot-swap scenarios. |
Applications
| Industrial Backplane Interfacing | Legacy Microprocessor Bus Extension |
|---|---|
Use Scenario: Connecting CPU address/data bus to peripheral expansion slots in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Bidirectional bus buffer with independent direction control, enabling CPU read/write cycles to isolated I/O modules. Use Value: Prevents bus loading and timing skew across long traces; dual OE allows precise cycle-by-cycle direction management. |
Use Scenario: Extending Z80 or 8085 system bus to add memory-mapped peripherals without altering master timing. IC Role / Device Role / Timing Role: Synchronous 8-bit transceiver that meets strict setup/hold timing windows of vintage CPUs. Use Value: Propagation delay ≤13 ns ensures compatibility with 4–6 MHz clock domains; 3-state outputs support multi-drop bus topologies. |
| Embedded System Bus Isolation | Test Equipment Signal Routing |
Use Scenario: Isolating sensor interface bus from main controller bus in medical diagnostic equipment. IC Role / Device Role / Timing Role: Fault-containment barrier that disables data flow on fault detection via OEAB/OEBA deassertion. Use Value: Prevents fault propagation between subsystems; latched state preserves bus integrity during reset or error recovery. |
Use Scenario: Configurable signal path switching in automated test equipment (ATE) for DUT stimulus/response routing. IC Role / Device Role / Timing Role: Reconfigurable bidirectional channel controlled by FPGA GPIOs driving OEAB/OEBA. Use Value: Eliminates mechanical relays; enables sub-20 ns reconfiguration latency for high-throughput parametric testing. |
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, 20 pcs/tube. | Preferred for prototyping, manual assembly, or legacy board rework where SOP-20 footprint is unavailable. | Select SN74ALS623AN for hand-soldered development boards or field repair; SN74ALS623ANSR for automated SMT production. |
| SN74AS623 | Faster propagation (1–9 ns vs. 2–13 ns) and higher drive (64 mA IOL), but consumes more ICC (up to 189 mA) and uses same SOP-20 package. | Suitable for high-speed bus segments requiring tighter timing margins, but requires enhanced thermal management. | Choose SN74AS623 only if timing budget demands <10 ns delay and board layout accommodates higher power dissipation. |
Compared with SN74ALS623AN, SN74ALS623ANSR offers surface-mount scalability and tape-and-reel automation; compared with SN74AS623, it trades speed for lower power and broader legacy compatibility-making it optimal for cost-sensitive, thermally constrained commercial designs.
Availability
SN74ALS623ANSR is available at Aetrix Electronics and suitable for industrial backplanes, legacy microprocessor bus extensions, and embedded system bus isolation requiring stable component supply over extended product lifecycles.
Supply support for SN74ALS623ANSR 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 with decades of expertise in logic ICs, analog, and embedded processing solutions, serving industrial, automotive, and communications markets.
The SN74ALS623ANSR belongs to TI's legacy Advanced Low-Power Schottky (ALS) logic family, engineered for reliable, pin-compatible replacement of older TTL bus components in long-lifecycle industrial systems.
FAQ
What is the logic configuration of SN74ALS623ANSR?
The SN74ALS623ANSR implements true (non-inverting) logic with 3-state outputs. Data passes unchanged from A to B or B to A depending on OEAB and OEBA states. Unlike SN74ALS620A (inverting), SN74ALS623ANSR preserves signal polarity, simplifying bus interface design in systems where inversion would require additional logic.
Does SN74ALS623ANSR support bus latching functionality?
Yes. When both OEAB and OEBA are asserted low, the SN74ALS623ANSR enters local bus-latch mode: both A and B ports retain their last driven states, effectively storing 16 bits of data without external latches. This behavior is confirmed in the functional table and described in the device description section of the datasheet.
What are the absolute maximum ratings for SN74ALS623ANSR?
The SN74ALS623ANSR has an absolute maximum VCC of 7 V, input voltage limit of 7 V on all pins, and I/O port voltage limit of 5.5 V. Storage temperature range is –65°C to 150°C. Exceeding these values may cause permanent damage; operation must remain within recommended conditions (4.5–5.5 V, 0–70°C).
Is SN74ALS623ANSR pin-compatible with other variants in the SN74ALS62x series?
Yes. SN74ALS623ANSR shares identical pinout and package dimensions with SN74ALS620A, SN74ALS621A, and SN74ALS623A in SOP-20 (NS) and SOIC-20 (DW) packages. However, logic behavior differs: SN74ALS620A is inverting, SN74ALS621A has open-collector outputs, and only SN74ALS623A/SN74AS623 are true 3-state.
What is the recommended operating condition for output current in SN74ALS623ANSR?
The SN74ALS623ANSR is rated for IOL = 24 mA (low-level) and IOH = –15 mA (high-level) under recommended conditions (VCC = 4.5–5.5 V, TA = 0–70°C). These values ensure reliable TTL-compatible drive strength while maintaining VOL ≤ 0.5 V and VOH ≥ 2.4 V per electrical characteristics tables.
SN74ALS623ANSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-SO
SN74ALS623ANSR FAQ
1.How can I place an order for SN74ALS623ANSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS623ANSR 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 SN74ALS623ANSR reliable?
The price and inventory of SN74ALS623ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS623ANSR is usually 5 days.
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SN74ALS623ANSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS623ANSR 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 SN74ALS623ANSR?
For technical support, including SN74ALS623ANSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS623ANSR requirements.
6.How does Aetrix verify that SN74ALS623ANSR is sourced from the original manufacturer or authorized distributors?
All SN74ALS623ANSR 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 SN74ALS623ANSR meets industry standards.
7.What is the process for return or replacement of SN74ALS623ANSR?
All SN74ALS623ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS623ANSR, 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 SN74ALS623ANSR part is unused and in its original packaging.
Return procedure for SN74ALS623ANSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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