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Texas Instruments CD74AC245EE4
- Part No.:
- CD74AC245EE4
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
CD74AC245EE4.pdf
- Description:
- CD74AC245 OCTAL NON-INVERTING BU
- Quantity:
- Payment:
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Inventory:599
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Product details
Overview
CD74AC245EE4 from Texas Instruments is an octal non-inverting three-state bidirectional bus transceiver in 20-pin PDIP packaging, operating from 1.5V to 5.5V, delivering ±24mA output drive, 4ns typical propagation delay at 5V/25°C/50pF, and ESD protection exceeding 2kV per MIL-STD-883 Method 3015 - used for bidirectional data routing between microcontroller buses and peripheral subsystems in industrial control modules.
For engineers reviewing the CD74AC245EE4 datasheet, CD74AC245EE4 pinout, CD74AC245EE4 application, or CD74AC245EE4 equivalent, key selection considerations include its 1.5–5.5V supply range, direction-controlled bidirectional flow, high-impedance isolation when OE is HIGH, 20-pin DIP footprint compatibility, and robust SCR-latchup-resistant CMOS process for harsh-environment embedded systems.
Technical Context
The CD74AC245EE4 implements a dual-bus architecture with DIR input selecting A→B or B→A data flow, and OE enabling/disabling all outputs simultaneously into high-impedance state. Its Advanced CMOS logic ensures balanced tPLH/tPHL delays and rail-to-rail noise immunity across the full 1.5–5.5V VCC range.
It features buffered inputs, 10pF input capacitance, 15pF three-state output capacitance, and supports fanout to 15 FAST™ ICs or direct 50Ω transmission-line driving - verified at 85°C (75Ω) and 125°C (50Ω) per switching specifications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 5.5V - enables interoperability with 1.8V, 3.3V, and 5V logic domains without level shifters |
| Propagation Delay (tPLH/tPHL) | 7.7ns max at 5V, -55°C to 125°C - ensures timing-critical bus handshaking in real-time control loops |
| Output Drive Current | ±24mA - sufficient to directly drive 50Ω transmission lines or interface with legacy TTL/FAST loads |
| ESD Protection | >2kV per MIL-STD-883 Method 3015 - meets industrial handling and board-level ESD immunity requirements |
| Operating Temperature | -55°C to +125°C - qualified for extended-range automotive, aerospace, and downhole instrumentation |
| Three-State Leakage | ±10µA max at -55°C to 125°C - minimizes standby current in isolated bus segments |
| Input Capacitance | 10pF - reduces capacitive loading on upstream drivers and preserves signal integrity at high frequencies |
Pinout & Package
CD74AC245EE4 uses a 20-pin plastic dual in-line package (PDIP), 0.300" wide, with standard through-hole mounting and JEDEC MS-013 compliant dimensions (13.0mm × 7.6mm × 4.4mm height).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 15, 16, 17, 18, 19, 20 | A0–A7, B0–B7 I/O | Bidirectional data terminals - A-side and B-side pins are functionally identical and interchangeable in layout; each pair routes data in direction set by DIR |
| 9 | GND | Ground reference for all internal circuitry and I/O - must be low-impedance connection to minimize ground bounce during simultaneous switching |
| 10 | VCC | Positive supply rail - requires local 0.1µF ceramic bypass capacitor placed within 5mm of pin per high-speed switching guidelines |
| 11 | DIR | Direction control input - LOW enables B→A transfer; HIGH enables A→B transfer; internally pulled down in absence of external bias |
| 14 | OE | Output enable input - HIGH forces all outputs into high-impedance state; LOW enables bidirectional data flow per DIR setting |
Key Features
| Feature | Design Value |
|---|---|
| SCR-latchup-resistant CMOS process | Prevents destructive latch-up under transient overvoltage or hot-swap conditions in industrial power rails |
| Balanced propagation delays (tPLH ≈ tPHL) | Eliminates duty-cycle distortion in clock-forwarding or synchronous data transfer applications |
| 1.5V to 5.5V operation with 30% noise margin | Ensures reliable logic thresholds across wide VCC tolerances and noisy supply environments |
| ±24mA drive into 50Ω loads | Supports point-to-point or short stub transmission-line topologies without external line drivers |
| Three-state isolation with ≤10µA leakage | Enables multi-drop bus arbitration and prevents contention when multiple transceivers share common lines |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module Bus Extender |
|---|---|
Use Scenario: Isolating and extending CAN or LIN sub-buses between main controller and distributed sensor nodes in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional level-translating buffer managing data flow between 3.3V MCU and 5V legacy I/O modules while maintaining timing alignment across 20cm backplane traces. Use Value: Eliminates need for discrete level shifters and reduces PCB layer count via single-package bidirectional bridging with guaranteed 7.7ns max delay skew. | Use Scenario: Interfacing door module microcontrollers with central body domain controller using shared serial peripheral bus. IC Role / Device Role / Timing Role: Three-state transceiver enabling time-multiplexed access to shared diagnostic and configuration lines without hardware arbitration logic. Use Value: Provides 24mA drive strength to overcome wiring harness capacitance up to 150pF and maintains signal integrity at 2Mbps baud rates. |
| Test Equipment Digital Pattern Generator | Military Radios Data Bus Coupler |
Use Scenario: Routing parallel test vectors between FPGA pattern generator and DUT socket in automated test equipment. IC Role / Device Role / Timing Role: High-speed bidirectional bus repeater synchronizing 8-bit data paths between 5V logic analyzer front-end and 3.3V FPGA core. Use Value: Delivers 4ns typical propagation delay and <10pF input capacitance to preserve edge fidelity at >50MHz toggle rates. | Use Scenario: Coupling encrypted data streams between secure crypto processor and RF baseband IC in tactical radios. IC Role / Device Role / Timing Role: Radiation-tolerant bus isolator preventing fault propagation between mission-critical subsystems during EMI events. Use Value: Leverages -55°C to +125°C qualification and >2kV ESD rating to sustain operation in airborne vibration and thermal cycling environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC245N | Same AC logic family, identical pinout, 20-pin PDIP, but TI's current production version with updated RoHS compliance and MSL Level-1 rating | Identical functional behavior and timing; differs only in manufacturing date code, traceability, and moisture sensitivity classification | Select SN74AC245N for new designs requiring latest TI wafer fab controls and tape-and-reel availability. |
| 74LCX245M | Lower 2.0–3.6V supply range, 24mA drive, but uses Low-Voltage CMOS (LCX) process with different VIH/VIL thresholds and higher ICC at 3.3V | Suitable only for 3.3V-only systems; not interoperable with 5V buses or 1.8V logic without additional translation | Choose 74LCX245M only when system operates strictly at 3.3V and requires lower static power than AC series. |
Compared with SN74AC245N, CD74AC245EE4 offers identical electrical performance but older packaging documentation and no MSL rating - whereas 74LCX245M trades supply flexibility for reduced 3.3V quiescent current, making it unsuitable for mixed-voltage bus bridging where CD74AC245EE4 excels.
Availability
CD74AC245EE4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, and military radio data buses requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD74AC245EE4 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 specializing in analog, embedded processing, and connectivity technologies with over 90 years of innovation in industrial, automotive, and aerospace markets.
The CD74AC245EE4 belongs to TI's legacy Advanced CMOS (AC) logic family, designed specifically for high-speed, low-power bidirectional bus interfacing in ruggedized embedded systems where voltage flexibility and latch-up immunity are critical.
FAQ
What is the maximum operating temperature range for CD74AC245EE4?
The CD74AC245EE4 is rated for continuous operation from -55°C to +125°C, meeting extended industrial and military environmental requirements. This specification is validated per the Absolute Maximum Ratings table and confirmed across all DC and switching parameters in the datasheet's -55°C to 125°C characterization columns - ensuring reliable functionality in engine compartments, downhole tools, and avionics enclosures where ambient extremes occur.
Does CD74AC245EE4 support 1.8V logic levels?
Yes, CD74AC245EE4 fully supports 1.8V operation: its 1.5V to 5.5V supply range includes 1.8V nominal, and DC specifications guarantee VIH = 1.2V and VIL = 0.3V at VCC = 1.5V - providing 0.6V noise margin. Input thresholds scale linearly with VCC, so at 1.8V supply, VIH is ~1.3V and VIL is ~0.5V, compatible with standard 1.8V CMOS outputs without level shifting.
How does the DIR pin control data direction in CD74AC245EE4?
In CD74AC245EE4, the DIR pin determines bidirectional flow: when DIR = LOW, data transfers from B-bus to A-bus; when DIR = HIGH, data flows from A-bus to B-bus. This control is asynchronous and immediate - propagation delay applies, but no clock or setup time is required. The truth table explicitly defines this behavior, and OE must be LOW for either direction to be active.
Can CD74AC245EE4 drive 50Ω transmission lines directly?
Yes, CD74AC245EE4 is specified to drive 50Ω transmission lines directly: the datasheet confirms ±24mA output drive capability verified at 85°C (75Ω) and 125°C (50Ω) per Note 7. At VCC = 5V, VOL ≤ 0.5V at 24mA ensures clean low-level signaling, and VOH ≥ 3.7V guarantees robust high-level margins - eliminating need for external line drivers in point-to-point or short-stub configurations up to 30cm.
Is CD74AC245EE4 pin-compatible with CD74ACT245EE4?
No, CD74AC245EE4 is not pin-compatible with CD74ACT245EE4 in functional operation: although both share identical 20-pin PDIP mechanical footprint and pin assignments, the ACT variant requires 4.5–5.5V supply and has TTL-compatible input thresholds (VIH = 2.0V min), while AC accepts 1.5–5.5V and uses CMOS thresholds (VIH = 3.85V at 5.5V). Swapping them risks input threshold mismatch and undefined logic states outside 5V operation.
CD74AC245EE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
CD74AC245EE4 FAQ
1.How can I place an order for CD74AC245EE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74AC245EE4 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 CD74AC245EE4 reliable?
The price and inventory of CD74AC245EE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC245EE4 is usually 5 days.
3.What payment methods are accepted for CD74AC245EE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC245EE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74AC245EE4?
CD74AC245EE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74AC245EE4 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 CD74AC245EE4?
For technical support, including CD74AC245EE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC245EE4 requirements.
6.How does Aetrix verify that CD74AC245EE4 is sourced from the original manufacturer or authorized distributors?
All CD74AC245EE4 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 CD74AC245EE4 meets industry standards.
7.What is the process for return or replacement of CD74AC245EE4?
All CD74AC245EE4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC245EE4, 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 CD74AC245EE4 part is unused and in its original packaging.
Return procedure for CD74AC245EE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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