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Texas Instruments CD54HCT245F
- Part No.:
- CD54HCT245F
- Manufacturer:
- Texas Instruments
- Package:
- 20-CDIP (0.300", 7.62mm)
- Datasheet:
-
CD54HCT245F.pdf
- Description:
- CD54HCT245 HIGH SPEED CMOS LOGIC
- Quantity:
- Payment:
- Shipping:
Inventory:992
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Product details
Overview
CD54HCT245F from Texas Instruments is a high-speed octal three-state bidirectional bus transceiver in CERDIP package, operating at 4.5V–5.5V with 10ns typical propagation delay (CL = 15pF), ±25mA output drive, and -55°C to +125°C temperature range-used for asynchronous data bus interfacing in military-grade embedded control systems.
For engineers reviewing the CD54HCT245F datasheet, CD54HCT245F pinout, CD54HCT245F application, or CD54HCT245F equivalent, key selection criteria include LSTTL-compatible input thresholds (VIL ≤ 0.8V, VIH ≥ 2.0V), three-state enable timing (tPLZ/tPHZ ≤ 45ns), bus driving capability (15 LSTTL loads), and CERDIP packaging for ruggedized thermal and mechanical reliability.
Technical Context
The CD54HCT245F implements non-inverting bidirectional data flow between two 8-bit buses (A0–A7 and B0–B7) controlled by DIR and OE inputs. Its HCT logic family ensures direct compatibility with LSTTL inputs while delivering CMOS-level quiescent current (ICC ≤ 160µA over full temperature range).
Direction control is synchronous: DIR = low enables B→A transfer; DIR = high enables A→B transfer. OE = high forces all I/Os into high-impedance state regardless of DIR, with leakage limited to ±10µA (IOZ) across -55°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V to 5.5V - Ensures stable operation in 5V LSTTL-compatible systems without level-shifting. |
| Propagation Delay | 10ns typical (A↔B, CL = 15pF, TA = 25°C) - Enables sub-100MHz bus handshaking in real-time control loops. |
| Output Drive | ±25mA per pin - Supports direct connection to 15 LSTTL loads or large-capacitance backplanes (≤50pF). |
| Operating Temperature | -55°C to +125°C - Qualified for extended-range military and aerospace applications per MIL-PRF-38535. |
| Input Thresholds | VIL ≤ 0.8V, VIH ≥ 2.0V - Guarantees reliable logic recognition when driven by standard 5V TTL outputs. |
| Three-State Leakage | ±10µA max (IOZ, -55°C to +125°C) - Minimizes signal integrity risk during bus isolation in multi-drop configurations. |
Pinout & Package
CD54HCT245F uses a 20-lead CERDIP (Ceramic Dual In-line Package) with 0.3-inch body width, 0.1-inch lead pitch, and hermetic sealing for moisture resistance and long-term reliability in harsh environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19–20 | A0–A7 I/O | Octal bidirectional data port A - Connects to local subsystem bus; direction determined by DIR. |
| 2–9 | B0–B7 I/O | Octal bidirectional data port B - Interfaces with external bus or peripheral; isolated when OE = high. |
| 10 | GND | Ground reference - Must be low-impedance connection to minimize noise coupling in mixed-signal systems. |
| 11 | VCC | Positive supply - Requires local 0.1µF ceramic decoupling adjacent to pin to suppress switching transients. |
| 12 | DIR | Direction control input - Low = B→A transfer; high = A→B transfer; TTL-compatible threshold. |
| 13 | OE | Output enable input - High = all I/Os in high-Z; low = active data transfer; active-low polarity. |
Key Features
| Feature | Design Value |
|---|---|
| LSTTL Input Compatibility | VIL ≤ 0.8V / VIH ≥ 2.0V at VCC = 5V - Eliminates need for external level translators when interfacing with legacy TTL logic. |
| High-Drive Three-State Outputs | ±25mA sink/source per pin - Drives long traces or multiple receivers without external buffers in avionics backplanes. |
| Wide Temperature Range | -55°C to +125°C operation - Meets MIL-STD-883 requirements for deployment in uncontrolled environmental enclosures. |
| Low Quiescent Power | ICC ≤ 160µA at -55°C to +125°C - Reduces system-level heat generation in densely packed military computing modules. |
| Controlled Transition Times | tTHL/tTLH ≤ 18ns (CL = 50pF) - Limits EMI emissions and crosstalk in high-density PCB layouts with adjacent signal routing. |
Applications
| Avionics Data Bus Interface | Military Vehicle Control System |
|---|---|
Use Scenario: Bidirectional communication between flight computer and sensor acquisition module across a 2m ribbon cable with 45pF/m capacitance. IC Role / Device Role / Timing Role: Bus transceiver managing A-B data flow under DIR control, with OE used for fault-isolation during watchdog-triggered resets. Use Value: 15 LSTTL load drive capability maintains signal integrity across full cable length; -55°C to +125°C rating supports operation in unheated aircraft bays. |
Use Scenario: Interfacing a radiation-hardened microcontroller to CAN bus transceivers and analog I/O expanders in tracked vehicle engine control unit. IC Role / Device Role / Timing Role: Level-shifting and bus buffering between 5V MCU GPIO and mixed-voltage peripherals; DIR toggled per command packet direction. Use Value: LSTTL-compatible inputs accept direct connection to legacy 5V logic; CERDIP package resists thermal shock during rapid ambient temperature swings. |
| Tactical Radio Baseband Processing | Secure Crypto Module Interconnect |
Use Scenario: Isolating baseband DSP and RF front-end ICs during RF transmit bursts to prevent digital noise coupling into sensitive analog paths. IC Role / Device Role / Timing Role: Three-state gate controlled by RF power amplifier enable signal; OE asserted during TX to disconnect digital bus from RF section. Use Value: IOZ ≤ ±10µA ensures negligible leakage current during isolation, preserving signal integrity in low-noise receiver chains. |
Use Scenario: Secure boundary between tamper-detect FPGA and cryptographic co-processor in NSA-certified encryption hardware. IC Role / Device Role / Timing Role: Physically separated bus interface with controlled enable/disable timing to prevent side-channel timing analysis during key operations. Use Value: Propagation delay consistency (±3ns variation over temperature) enables deterministic bus arbitration timing for TEMPEST-compliant designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal three-state bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD74HCT245E | Same logic function and electrical specs, but in PDIP package (non-hermetic, 0.3" width, Pb-free finish) | Suitable for commercial/industrial prototyping; lacks CERDIP's hermeticity and extended temp margin | Select when cost-sensitive evaluation or non-military production is required and MIL-spec packaging is unnecessary. |
| SN74HCT245N | Identical HCT logic, same pinout, but rated only to -40°C to +85°C and offered in PDIP/SOIC only | Not qualified for extended temperature or military use; lower reliability screening | Choose for consumer or industrial applications where full -55°C to +125°C operation is not mandated. |
Compared with CD54HCT245F, CD74HCT245E provides identical functionality in a lower-cost plastic package with reduced environmental robustness, while SN74HCT245N offers broader commercial availability but omits military-grade temperature and reliability qualification.
Availability
CD54HCT245F is available at Aetrix Electronics and suitable for avionics data bus interface, military vehicle control system, tactical radio baseband processing, and secure crypto module interconnect requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CD54HCT245F 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 expertise in analog, embedded processing, and high-reliability logic solutions, serving aerospace, defense, and industrial markets since 1930.
The CD54HCT245F belongs to TI's military-grade HCT logic family, designed specifically for high-integrity bidirectional bus interfacing in systems demanding extended temperature operation, hermetic packaging, and MIL-PRF-38535 compliance.
FAQ
What is the maximum operating voltage for CD54HCT245F?
The CD54HCT245F operates strictly within 4.5V to 5.5V supply range. Exceeding 5.5V violates absolute maximum ratings and risks permanent damage. This narrow window ensures LSTTL input compatibility and stable CMOS output levels, making it unsuitable for 3.3V or 6V systems without level translation.
Does CD54HCT245F support hot insertion or live bus swapping?
No, CD54HCT245F does not support hot insertion. Its absolute maximum ratings specify no DC input voltage below GND or above VCC, and the device lacks bus-hold or power-up/down protection circuitry. Applying signals before VCC stabilization may cause latch-up or excessive current flow, requiring strict power sequencing in backplane designs.
How does the direction control (DIR) pin behave during power-up?
During power-up, the DIR pin has no defined state until VCC reaches valid logic thresholds; its value is indeterminate and must be externally held stable via pull-up or pull-down resistor. TI recommends tying DIR to a known logic level (e.g., via 10kΩ to VCC or GND) before enabling OE to prevent unintended bus contention during initialization of the CD54HCT245F.
Is CD54HCT245F pin-compatible with CD54HC245F?
Yes, CD54HCT245F is pin-compatible with CD54HC245F - both share identical CERDIP-20 pinout, terminal functions, and physical dimensions. However, CD54HC245F operates from 2V–6V and uses CMOS input thresholds, whereas CD54HCT245F requires 4.5V–5.5V and accepts LSTTL inputs, so voltage domain and driver compatibility must be verified separately.
What is the recommended termination for unused I/O pins on CD54HCT245F?
Unused I/O pins on CD54HCT245F must be terminated to VCC or GND via 10kΩ–1MΩ resistors, as specified in the truth table note. Floating inputs can cause increased ICC, oscillation, or excessive heating due to undefined input states - especially critical in high-reliability applications where the CD54HCT245F is deployed.
CD54HCT245F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54HCT
- Package/Case:
- 20-CDIP (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:
- 4mA, 4mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-CDIP
CD54HCT245F FAQ
1.How can I place an order for CD54HCT245F through Aetrix?
Please submit a Request for Quotation (RFQ) for CD54HCT245F 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 CD54HCT245F reliable?
The price and inventory of CD54HCT245F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD54HCT245F is usually 5 days.
3.What payment methods are accepted for CD54HCT245F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD54HCT245F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD54HCT245F?
CD54HCT245F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD54HCT245F 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 CD54HCT245F?
For technical support, including CD54HCT245F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD54HCT245F requirements.
6.How does Aetrix verify that CD54HCT245F is sourced from the original manufacturer or authorized distributors?
All CD54HCT245F 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 CD54HCT245F meets industry standards.
7.What is the process for return or replacement of CD54HCT245F?
All CD54HCT245F units undergo pre-shipment inspection (PSI). If there is an issue with CD54HCT245F, 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 CD54HCT245F part is unused and in its original packaging.
Return procedure for CD54HCT245F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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