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Texas Instruments CD74AC623E
- Part No.:
- CD74AC623E
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74AC623E.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:386
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Product details
Overview
CD74AC623E from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional data transfer between two 8-bit buses in TTL/CMOS mixed-signal systems. It features ±24mA output drive, 5.5V absolute maximum supply rating, and operates across −55°C to +125°C. It is used in industrial control backplanes and legacy system bus interfacing.
For engineers reviewing the CD74AC623E datasheet, CD74AC623E pinout, CD74AC623E application, or CD74AC623E equivalent, key selection criteria include its 3-state enable timing, high noise immunity (400mV typical), wide temperature range, and compatibility with both AC and ACT logic families.
Technical Context
The CD74AC623E implements dual 4-bit directional control via separate OE\ (output enable) and DIR (direction) inputs, enabling independent control of data flow direction per nibble. Its CMOS input structure provides high input impedance and low static current draw.
It uses standard AC-series silicon process with Schmitt-trigger inputs on control pins (OE\ and DIR), ensuring robust noise rejection during bus arbitration. Propagation delay is 7.5ns (max) at VCC = 5V, with matching tPLH/tPHL skew under 1.5ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced CMOS (AC), TTL-compatible input thresholds |
| Supply Voltage Range | 2V to 6V - supports mixed-voltage system interfacing |
| Output Drive | ±24mA - sufficient to drive 15 LSTTL loads or 20pF capacitive bus |
| Propagation Delay | 7.5ns max at 5V - enables operation up to ~80MHz bus toggle rate |
| Operating Temperature | −55°C to +125°C - qualified for extended industrial/military environments |
| Input Hysteresis | 400mV typ on OE\ and DIR - prevents chatter during slow-rising control signals |
| Quiescent Current | 4µA max at 25°C - negligible standby power in battery-backed systems |
Pinout & Package
CD74AC623E is supplied in a 20-lead plastic dual-in-line package (PDIP-N), 7.62mm wide, 24.13mm long, with 2.54mm lead pitch and 3.3mm body height. Lead finish is NiPdAu (NIPDAU), RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | High = A→B transfer; Low = B→A transfer; Schmitt-triggered |
| 2–9 (A1–A8) | Bus A Data Inputs/Outputs | Bidirectional I/O port; high-impedance when OE\ = High |
| 10 (GND) | Ground Reference | Signal and power return path for all internal logic and I/O |
| 11–18 (B1–B8) | Bus B Data Inputs/Outputs | Bidirectional I/O port; complements A-side behavior per DIR state |
| 19 (OE\) | Output Enable (Active-Low) | Low enables transceiver; High forces all A/B pins into high-Z state |
| 20 (VCC) | Positive Supply | 2V–6V DC supply; decoupling capacitor required within 10mm |
Key Features
| Feature | Design Value |
|---|---|
| Independent Direction Control | Single DIR pin governs full 8-bit bidirectional flow without per-bit routing |
| High Noise Immunity | 400mV input hysteresis on control pins eliminates false triggering in noisy backplane environments |
| Wide Supply Range | 2V–6V operation allows direct interface with 3.3V microcontrollers and 5V legacy peripherals |
| Matched Propagation Skew | <1.5ns tPLH/tPHL mismatch ensures clean 8-bit data capture without nibble skew |
| Extended Temperature Qualification | −55°C to +125°C operation verified per MIL-STD-883, suitable for aerospace avionics and downhole tools |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
Use Scenario: Interfacing a modern 3.3V FPGA-based controller to a legacy 5V VMEbus peripheral card. IC Role / Device Role / Timing Role: Bidirectional level-translating bus transceiver with direction arbitration. Use Value: Eliminates need for discrete level shifters and reduces PCB layer count by consolidating 16 signal lines into one IC. | Use Scenario: Adding local memory expansion to a 1980s-era 8086-based industrial PLC with limited board space. IC Role / Device Role / Timing Role: Octal data buffer with 3-state isolation for shared address/data bus segmentation. Use Value: Enables hot-swappable module design via controlled OE\ sequencing, preventing bus contention during insertion. |
| Military Data Acquisition Subsystem | Automated Test Equipment (ATE) Signal Routing |
Use Scenario: Isolating sensor front-end analog-to-digital converters from central processing unit in a ruggedized field-deployable DAQ unit. IC Role / Device Role / Timing Role: Radiation-tolerant data conduit with guaranteed operation at −55°C ambient. Use Value: Maintains deterministic timing margins across extreme thermal cycling due to matched propagation characteristics. | Use Scenario: Reconfigurable signal path switching between DUT interface connectors and measurement instruments in modular ATE rack. IC Role / Device Role / Timing Role: Programmable bus gate with fast enable/disable for test sequence synchronization. Use Value: Achieves sub-10ns channel switching latency without external glue logic, reducing test cycle time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT623N | ACT family: higher speed (5.5ns max), tighter drive strength (±24mA same), but lower noise margin (300mV hysteresis) | Preferred where maximum throughput >100MHz is required; less tolerant of EMI in unshielded enclosures | Select SN74ACT623N only if system-level timing budget demands sub-6ns propagation and layout includes strict EMI mitigation. |
| CD74HC623E | HC family: slower (18ns max), lower drive (±7.8mA), wider VCC range (2–6V same), no Schmitt-triggered controls | Suitable for low-power, low-speed embedded subsystems where cost and quiescent current dominate over speed | Choose CD74HC623E when operating below 10MHz and total system power must remain under 100µW per transceiver. |
Compared with SN74ACT623N and CD74HC623E, the CD74AC623E delivers optimal balance of speed, noise immunity, and temperature resilience - making it the default choice for industrial backplanes and military-grade bus extensions where reliability trumps peak performance.
Availability
CD74AC623E is available at Aetrix Electronics and suitable for industrial control backplanes, military data acquisition subsystems, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74AC623E 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 over 90 years of innovation in industrial, automotive, and aerospace electronics.
The CD74AC623E belongs to TI's legacy AC logic family, engineered for high-reliability, wide-temperature interoperability between TTL and CMOS systems in mission-critical infrastructure.
FAQ
What is the maximum clock frequency supported by the CD74AC623E?
The CD74AC623E does not operate on a clock signal - it is an asynchronous bus transceiver. Its usable data toggle rate is determined by propagation delay (7.5ns max) and system setup/hold timing. At 5V, it reliably supports bidirectional bus transfers up to approximately 80MHz under typical load conditions. The CD74AC623E requires no external clock and responds immediately to changes on DIR and OE\ inputs.
Does the CD74AC623E support 3.3V-only operation?
Yes, the CD74AC623E supports 3.3V-only operation within its specified 2V–6V supply range. At VCC = 3.3V, it maintains TTL-compatible input thresholds and delivers ±24mA output drive, enabling direct interfacing with 3.3V microcontrollers while retaining compatibility with 5V peripherals. The CD74AC623E's AC logic family ensures stable operation across this full voltage range without derating.
Is the CD74AC623E pin-compatible with the CD74ACT623 series?
No, the CD74AC623E is not pin-compatible with the CD74ACT623 series. While both share identical pin count (20), package outline (PDIP-N), and functional pin assignments, the CD74ACT623 variants use different logic families (ACT vs AC) with distinct electrical characteristics - including input threshold levels, output drive profiles, and noise immunity. The CD74AC623E must be selected based on its specific AC-family specifications, not substituted without verifying system-level timing and voltage margin compliance.
What is the purpose of the Schmitt-trigger inputs on the CD74AC623E?
The CD74AC623E integrates Schmitt-trigger circuitry on its DIR and OE\ control inputs to provide hysteresis (~400mV), which prevents multiple output transitions caused by slow-rising or noisy control signals. This feature ensures clean, chatter-free bus direction and output-enable switching in electrically harsh environments such as industrial motor drives or military vehicle platforms. The CD74AC623E's Schmitt-trigger inputs eliminate the need for external RC filtering on control lines.
Can the CD74AC623E be used in place of a 74LS623 in legacy designs?
Yes, the CD74AC623E can replace 74LS623 in most legacy designs, provided VCC is set to 5V and timing margins are re-verified. It offers superior performance: lower power consumption (4µA vs 18mA quiescent), faster propagation (7.5ns vs 25ns), and higher output drive (±24mA vs ±8mA). However, the CD74AC623E's CMOS input structure requires attention to unused input termination - floating LS623 inputs may be tolerated, but CD74AC623E inputs must be pulled high or low to avoid undefined states.
CD74AC623E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 1.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
CD74AC623E FAQ
1.How can I place an order for CD74AC623E through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74AC623E 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 CD74AC623E reliable?
The price and inventory of CD74AC623E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC623E is usually 5 days.
3.What payment methods are accepted for CD74AC623E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC623E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74AC623E?
CD74AC623E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74AC623E 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 CD74AC623E?
For technical support, including CD74AC623E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC623E requirements.
6.How does Aetrix verify that CD74AC623E is sourced from the original manufacturer or authorized distributors?
All CD74AC623E 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 CD74AC623E meets industry standards.
7.What is the process for return or replacement of CD74AC623E?
All CD74AC623E units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC623E, 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 CD74AC623E part is unused and in its original packaging.
Return procedure for CD74AC623E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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