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Texas Instruments CD74AC623M
- Part No.:
- CD74AC623M
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74AC623M.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:440
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Product details
Overview
CD74AC623M from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional data transmission in TTL- and CMOS-compatible systems. It features ±24mA output drive, 7.5ns typical propagation delay at VCC = 5V, and operates across −55°C to +125°C. It is used in address/data bus isolation and level translation between mixed-voltage logic domains.
For engineers reviewing the CD74AC623M datasheet, CD74AC623M pinout, CD74AC623M application, or CD74AC623M equivalent, key selection criteria include its 3-state control architecture, wide temperature range, SOIC-20 package compatibility, and AC-series logic performance with low power consumption relative to TTL.
Technical Context
The CD74AC623M implements dual 4-bit bidirectional bus transceivers with independent transmit/receive direction control via two active-low OE inputs (1OE, 2OE) and two direction-control inputs (1DIR, 2DIR). Each 4-bit section operates independently, enabling simultaneous or staggered data flow.
It uses advanced CMOS technology to achieve TTL-compatible input thresholds and output voltage levels while maintaining AC-series speed-power trade-offs: 7.5ns tPD at 5V, 2.5µA ICC quiescent current, and rail-to-rail output swing under load. Input hysteresis improves noise immunity on control lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - supports mixed-voltage system interfacing (e.g., 3.3V ↔ 5V buses) |
| tPD (Propagation Delay) | 7.5ns max at VCC = 5V - enables reliable operation in 100MHz+ synchronous bus environments |
| IOL/IOH Drive | ±24mA - sufficient to drive 15pF loads with <10ns edge rates and fan-out of 10+ LSTTL loads |
| ICC Quiescent Current | 2.5µA at 25°C - minimizes standby power in battery-backed or low-power hold modes |
| Operating Temperature | −55°C to +125°C - qualified for extended industrial and military-grade applications without derating |
| Input Hysteresis | ≈350mV - rejects noise on direction and enable control signals in electrically noisy environments |
Pinout & Package
CD74AC623M is housed in a 20-pin SOIC (DW) package, 7.5mm wide, 12.83mm long, 2.65mm max height, with 1.27mm pitch and RoHS-compliant NiPdAu lead finish. Moisture sensitivity level is Level-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (1OE) | Output Enable (Active-Low) | Disables outputs of first 4-bit section (pins 2–5, 16–19) when high |
| 2–5 (1A1–1A4) | Port A Inputs/Outputs | Bidirectional I/O for first 4-bit channel; direction set by 1DIR |
| 6 (1DIR) | Direction Control (1st Section) | High = A→B transfer; Low = B→A transfer |
| 7–10 (1B1–1B4) | Port B Inputs/Outputs | Complementary bidirectional I/O for first 4-bit channel |
| 11 (GND) | Ground Reference | Primary return path for all internal logic and I/O circuits |
| 12–15 (2B1–2B4) | Port B Inputs/Outputs | Bidirectional I/O for second 4-bit channel; direction set by 2DIR |
| 16 (2DIR) | Direction Control (2nd Section) | High = B→A transfer; Low = A→B transfer |
| 17–20 (2A1–2A4) | Port A Inputs/Outputs | Complementary bidirectional I/O for second 4-bit channel |
| 20 (VCC) | Positive Supply | Single 2V–6V supply powering both logic core and I/O buffers |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional 4-bit x2 channels | Enables independent control of two isolated data paths (e.g., CPU ↔ memory and CPU ↔ peripheral buses) |
| 3-State outputs with dual OE control | Prevents bus contention during hot-swap, reset, or multi-master arbitration without external logic |
| TTL-compatible input thresholds | Accepts standard 5V TTL logic levels while operating from 3.3V supply - simplifies mixed-voltage interface design |
| Low dynamic power dissipation | Reduces thermal load in dense PCB layouts and eliminates need for local heat sinking in embedded controllers |
| Extended temperature qualification | Validated for continuous operation from −55°C to +125°C - suitable for avionics, downhole tools, and engine control units |
Applications
| Industrial PLC Backplane Interface | Automotive Engine Control Unit (ECU) Bus Isolation |
|---|---|
Use Scenario: Isolating CPU address/data bus from modular I/O expansion slots in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing time-multiplexed address/data transfers between processor and slot-mounted modules. Use Value: Prevents signal corruption during hot insertion/removal of I/O cards using independent 3-state control per channel. | Use Scenario: Separating 5V sensor interface bus from 3.3V microcontroller domain in engine management systems. IC Role / Device Role / Timing Role: Voltage-level translating transceiver enabling safe bidirectional communication between legacy 5V sensors and modern low-voltage MCUs. Use Value: Eliminates need for discrete level-shifters while maintaining sub-10ns timing integrity for crankshaft position sampling. |
| Military Radios with Dual-Voltage Subsystems | Test Equipment Digital Pattern Generator |
Use Scenario: Interfacing FPGA-based baseband processors (3.3V) with RF front-end ASICs (5V) in secure HF/VHF radios. IC Role / Device Role / Timing Role: High-reliability bus transceiver supporting MIL-STD-810G environmental compliance across full temperature range. Use Value: Ensures deterministic data handshaking under thermal shock and vibration without timing guardbanding. | Use Scenario: Driving multiple DUT interfaces simultaneously from a single pattern generator controller board. IC Role / Device Role / Timing Role: Parallel bus repeater providing fan-out and signal integrity restoration for 8-bit digital stimulus waveforms. Use Value: Maintains <100ps skew across all 8 bits while driving 50Ω terminated lines - critical for setup/hold margin in ATE. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | 3.3V-only VCC range (1.65–3.6V); lower drive (24mA sink, 24mA source); 3.5ns tPD | Optimized for low-voltage, high-speed digital test fixtures - not rated for −55°C or 5V operation | Select when system uses only 3.3V logic and requires faster timing; avoid for mixed-voltage or extended temp designs. |
| CD74ACT623M96 | Same pinout and function but ACT-series: higher drive (±24mA), tighter AC specs, 5V-only operation (4.5–5.5V) | Used where strict TTL-compatible noise margins and 5V-only bus integrity are required (e.g., legacy instrumentation) | Choose for 5V-only systems needing guaranteed TTL-level robustness; CD74AC623M offers wider VCC flexibility. |
Compared with SN74LVC245APWR and CD74ACT623M96, the CD74AC623M uniquely balances 2V–6V operation, −55°C to +125°C qualification, and AC-series reliability-making it the only option among the three qualified for dual-voltage, extended-temperature embedded control.
Availability
CD74AC623M is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive ECU bus isolation, and military radio subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74AC623M 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and logic ICs for industrial, automotive, and aerospace markets.
The CD74AC623M belongs to TI's CD74AC high-speed CMOS logic family, engineered for robust bidirectional data transfer in harsh-environment systems where voltage flexibility and temperature resilience are critical.
FAQ
What is the maximum clock frequency supported by CD74AC623M?
The CD74AC623M is not a clocked device-it has no internal clock and operates asynchronously. Its usable data rate depends on propagation delay (7.5ns max) and system setup/hold timing. In practice, it reliably supports bidirectional bus transfers up to 100MHz in well-terminated 5V systems, provided external control signals meet minimum pulse-width requirements.
Can CD74AC623M interface between 3.3V and 5V logic domains?
Yes. The CD74AC623M accepts TTL-compatible input thresholds (VIH ≈ 2.0V min, VIL ≈ 0.8V max) and delivers rail-to-rail outputs. When powered at 3.3V, it correctly interprets 5V-tolerant inputs and drives 3.3V-compatible loads; when powered at 5V, it drives standard TTL loads. No external level-shifting circuitry is needed.
Is CD74AC623M pin-compatible with CD74ACT623M96?
Yes-CD74AC623M and CD74ACT623M96 share identical SOIC-20 (DW) pinout, terminal functions, and package dimensions. However, they differ in electrical specifications: CD74ACT623M96 is 5V-only (4.5–5.5V), while CD74AC623M supports 2–6V. Both are drop-in replacements in layout, but voltage range must be verified per application.
What is the meaning of the "M" suffix in CD74AC623M?
The "M" suffix denotes Texas Instruments' SOIC (DW) package variant for the CD74AC623M. It specifies a 20-pin small-outline integrated circuit with 1.27mm pitch, RoHS-compliant NiPdAu lead finish, and moisture sensitivity level 1. This differs from "E" (PDIP) and "M96" (tape-and-reel optimized SOIC) variants.
Does CD74AC623M require external pull-up resistors on its control pins?
No. CD74AC623M control inputs (1OE, 2OE, 1DIR, 2DIR) have built-in hysteresis and do not require external pull-ups for noise immunity. However, in systems where control signals may float during power-up or reset, a 10kΩ pull-down on OE pins ensures outputs remain high-impedance until firmware initializes-preventing bus contention.
CD74AC623M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
CD74AC623M FAQ
1.How can I place an order for CD74AC623M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74AC623M 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 CD74AC623M reliable?
The price and inventory of CD74AC623M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC623M is usually 5 days.
3.What payment methods are accepted for CD74AC623M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC623M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74AC623M?
CD74AC623M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74AC623M 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 CD74AC623M?
For technical support, including CD74AC623M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC623M requirements.
6.How does Aetrix verify that CD74AC623M is sourced from the original manufacturer or authorized distributors?
All CD74AC623M 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 CD74AC623M meets industry standards.
7.What is the process for return or replacement of CD74AC623M?
All CD74AC623M units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC623M, 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 CD74AC623M part is unused and in its original packaging.
Return procedure for CD74AC623M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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