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Texas Instruments CD54AC245F3A
- Part No.:
- CD54AC245F3A
- Manufacturer:
- Texas Instruments
- Package:
- 20-CDIP (0.300", 7.62mm)
- Datasheet:
-
CD54AC245F3A.pdf
- Description:
- NON-INVERTING OCTAL-BUS TRANSCEI
- Quantity:
- Payment:
- Shipping:
Inventory:4,777
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Product details
Overview
CD54AC245F3A from Texas Instruments is a military-grade octal non-inverting three-state bus transceiver in a 20-pin CDIP (J) package, operating from 1.5 V to 5.5 V over –55°C to +125°C. It provides bidirectional A↔B data flow controlled by DIR and OE pins, delivers ±24 mA output drive, and achieves 4 ns typical propagation delay at 5 V/25°C/50 pF - enabling high-speed inter-bus communication in rugged avionics and defense systems.
For engineers reviewing the CD54AC245F3A datasheet, CD54AC245F3A pinout, CD54AC245F3A application, or CD54AC245F3A equivalent, key selection criteria include its wide supply range (1.5–5.5 V), SCR-latchup-resistant CMOS process, balanced propagation delays, 50 Ω transmission-line drive capability, and guaranteed operation across extended military temperature extremes.
Technical Context
The CD54AC245F3A implements a dual-bus bidirectional interface using positive-logic DIR control to select direction (A→B when DIR = HIGH, B→A when DIR = LOW) and active-LOW OE to enable/disable all outputs into high-impedance state. Its Advanced CMOS logic ensures compatibility with both TTL and CMOS inputs while maintaining low power consumption versus bipolar FAST™ families.
It features buffered inputs, 10 pF input capacitance, 15 pF three-state output capacitance, and 57 pF power dissipation capacitance - supporting stable timing in mixed-voltage systems. The device meets MIL-PRF-38535 Class B requirements and is SCR-latchup resistant per JEDEC JESD78.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5 V to 5.5 V - supports interoperability across 1.8 V, 3.3 V, and 5 V logic domains without level shifters |
| Propagation Delay (tPLH/tPHL) | Typ. 4 ns at VCC = 5 V, TA = 25°C, CL = 50 pF - enables ≤250 MHz data throughput in point-to-point links |
| Output Drive Current | ±24 mA - drives 50 Ω transmission lines directly and fans out to 15 FAST™ ICs |
| Operating Temperature | –55°C to +125°C - qualified for military, aerospace, and downhole industrial environments |
| Input/Output Voltage Levels | VIH = 1.2 V (min) at 1.5 V VCC; VIL = 0.3 V (max) - ensures robust noise immunity at 30% of supply |
| Three-State Leakage | ±10 µA max at VCC = 5.5 V - minimizes standby current in high-density bus architectures |
Pinout & Package
CD54AC245F3A uses a 20-pin Ceramic Dual In-line Package (CDIP, J) with 0.3-inch body width, 24.2 mm × 7.62 mm overall dimensions, and 24.2 mm × 6.92 mm body size. Pin 1 is located at the left end of the top row, identified by a circular index mark.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 DIR | Direction Control Input | High = A→B data flow; Low = B→A data flow; determines signal path polarity |
| 2–9 A0–A7 | Bidirectional Bus A Terminals | Interface to local processor/data bus; function as inputs or outputs depending on DIR state |
| 10 GND | Ground Reference | Primary return path for all internal logic and I/O circuits; must be low-inductance connection |
| 11–18 B0–B7 | Bidirectional Bus B Terminals | Interface to peripheral/memory bus; mirror A-side behavior under DIR control |
| 19 OE | Output Enable Input | Active-LOW: OE = LOW enables transceiver; OE = HIGH places all outputs in high-Z state |
| 20 VCC | Power Supply | Single-supply rail supporting 1.5–5.5 V; requires local 0.1 µF bypass capacitor per VCC pin |
Key Features
| Feature | Design Value |
|---|---|
| SCR-latchup-resistant CMOS process | Guarantees immunity to destructive latchup events in high-noise or ESD-prone environments |
| Balanced tPLH/tPHL propagation delays | Minimizes duty-cycle distortion in clock-forwarding or data-strobe applications |
| 1.5 V to 5.5 V wide supply range | Eliminates need for external voltage translators between mixed-voltage subsystems |
| ±24 mA output drive capability | Directly terminates 50 Ω PCB traces without external line drivers or resistive networks |
| Buffered inputs with 10 pF CI | Reduces capacitive loading on upstream drivers and improves signal integrity at high edge rates |
Applications
| Avionics Data Bus Interface | Military Vehicle Control Network |
|---|---|
|
Use Scenario: Bidirectional data exchange between flight computer (A bus) and sensor acquisition module (B bus) in a fly-by-wire system. IC Role / Device Role / Timing Role: Level-shifting, direction-controlled bus transceiver managing real-time command/response traffic. Use Value: Guaranteed operation at –55°C to +125°C and ±24 mA drive ensure reliable link integrity under extreme thermal cycling and vibration. |
Use Scenario: Interfacing a 3.3 V mission computer to legacy 5 V weapon subsystems via shared vehicle backbone bus. IC Role / Device Role / Timing Role: Voltage-tolerant octal transceiver enabling seamless protocol-agnostic data bridging. Use Value: 1.5–5.5 V supply range and balanced noise immunity eliminate external level shifters and reduce board area by 35%. |
| Secure Communications Crypto Module | Ruggedized Industrial PLC Backplane |
|
Use Scenario: Isolating cryptographic processor memory bus from external I/O controller during secure boot sequence. IC Role / Device Role / Timing Role: Three-state-enabled bus buffer providing hardware-enforced data path isolation. Use Value: Active-LOW OE allows fail-safe disable via FPGA GPIO; high-Z leakage <10 µA prevents bus contention during reset. |
Use Scenario: Extending modular I/O rack backplane to support mixed-voltage analog/digital modules in oilfield control cabinets. IC Role / Device Role / Timing Role: Robust bus repeater driving long parallel traces across noisy 24 V DC industrial environment. Use Value: SCR-latchup resistance and 4 ns propagation delay maintain deterministic timing despite EFT bursts up to 4 kV. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD54ACT245F3A | TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at 5 V); faster tPLH/tPHL (2.7 ns typ) | Optimized for legacy 5 V TTL systems; less suitable for sub-3.3 V domains | Select when interfacing exclusively with 5 V TTL logic and maximum speed is critical |
| SN74AC245N | Commercial temperature range only (–40°C to +85°C); same AC logic family and pinout | Not qualified for military/aerospace use; RoHS-compliant (Pb-free) | Select for cost-sensitive industrial designs where extended temperature is not required |
Compared with CD54AC245F3A, CD54ACT245F3A offers tighter timing but narrower voltage flexibility, while SN74AC245N provides identical functionality at lower cost and environmental compliance - yet lacks the military-grade reliability and extended temperature margin essential for defense-critical deployments.
Availability
CD54AC245F3A is available at Aetrix Electronics and suitable for avionics data bus interfaces, military vehicle control networks, secure communications crypto modules, and ruggedized industrial PLC backplanes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD54AC245F3A 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 designing analog and embedded processing chips for industrial, automotive, and aerospace markets, with over 90 years of innovation in high-reliability components.
CD54AC245F3A belongs to TI's military-grade Advanced CMOS (AC) logic family, engineered specifically for high-speed, low-power, radiation-tolerant digital interfacing in safety-critical defense and space applications.
FAQ
What is the maximum operating temperature for CD54AC245F3A?
The CD54AC245F3A is rated for continuous operation from –55°C to +125°C ambient temperature, meeting MIL-PRF-38535 Class B requirements. This specification is validated across all electrical parameters in the datasheet's Recommended Operating Conditions table and confirmed in thermal testing per JEDEC JESD51-1.
Does CD54AC245F3A support 3.3 V logic levels?
Yes, CD54AC245F3A fully supports 3.3 V operation: its 1.5 V to 5.5 V supply range includes 3.3 V nominal, and input thresholds scale accordingly (e.g., VIH = 2.1 V min at VCC = 3.3 V). Output VOH/VOL specs guarantee compatibility with standard 3.3 V CMOS receivers.
How does the DIR pin control data direction in CD54AC245F3A?
In CD54AC245F3A, the DIR pin is a logic-level control: when DIR = HIGH, data flows from A-bus inputs to B-bus outputs; when DIR = LOW, data flows from B-bus inputs to A-bus outputs. This bidirectional routing is concurrent across all eight channels and independent of OE state.
Is CD54AC245F3A pin-compatible with CD74AC245E?
Yes, CD54AC245F3A and CD74AC245E share identical pinout, logic function, and AC electrical characteristics. The difference lies solely in packaging (CDIP vs. PDIP) and qualification: CD54AC245F3A is military-qualified (Class B), while CD74AC245E is commercial-grade.
What is the purpose of the OE pin in CD54AC245F3A?
The OE (Output Enable) pin in CD54AC245F3A is an active-LOW control that places all A- and B-side outputs into high-impedance state when asserted HIGH. When OE = LOW, the transceiver operates normally per DIR setting - enabling bus sharing and preventing contention in multi-master systems.
CD54AC245F3A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54AC
- Package/Case:
- 20-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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-CDIP
CD54AC245F3A FAQ
1.How can I place an order for CD54AC245F3A through Aetrix?
Please submit a Request for Quotation (RFQ) for CD54AC245F3A 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 CD54AC245F3A reliable?
The price and inventory of CD54AC245F3A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD54AC245F3A is usually 5 days.
3.What payment methods are accepted for CD54AC245F3A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD54AC245F3A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD54AC245F3A?
CD54AC245F3A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD54AC245F3A 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 CD54AC245F3A?
For technical support, including CD54AC245F3A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD54AC245F3A requirements.
6.How does Aetrix verify that CD54AC245F3A is sourced from the original manufacturer or authorized distributors?
All CD54AC245F3A 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 CD54AC245F3A meets industry standards.
7.What is the process for return or replacement of CD54AC245F3A?
All CD54AC245F3A units undergo pre-shipment inspection (PSI). If there is an issue with CD54AC245F3A, 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 CD54AC245F3A part is unused and in its original packaging.
Return procedure for CD54AC245F3A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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