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Texas Instruments CD54ACT245F3A
- Part No.:
- CD54ACT245F3A
- Manufacturer:
- Texas Instruments
- Package:
- 14-CDIP (0.300", 7.62mm)
- Datasheet:
-
CD54ACT245F3A.pdf
- Description:
- CD54ACT245 NON-INVERTING OCTAL-B
- Quantity:
- Payment:
- Shipping:
Inventory:1,763
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Product details
Overview
CD54ACT245F3A from Texas Instruments (formerly Harris Semiconductor) is a military-grade octal bus transceiver IC that provides non-inverting, three-state bidirectional data transfer between two 8-bit buses (A and B). It operates at 4.5V–5.5V, delivers ±24mA output drive, features 4ns typical propagation delay at 5V/25°C/50pF, and is qualified for -55°C to +125°C operation in CERDIP packaging. It is used in high-reliability avionics and defense system backplanes.
For engineers reviewing the CD54ACT245F3A datasheet, CD54ACT245F3A pinout, CD54ACT245F3A application, or CD54ACT245F3A equivalent, key selection criteria include its 20-pin CERDIP package, DIR/OE control logic, ±24mA drive strength, MIL-STD-883-compliant ESD rating (>2kV), and guaranteed operation across extreme temperature ranges without derating.
Technical Context
The CD54ACT245F3A implements an Advanced CMOS (ACT) process with SCR-latchup resistance and buffered inputs. Its direction control (DIR) selects A→B or B→A data flow, while output enable (OE) places all outputs in high-impedance state when asserted high.
It supports TTL-compatible input thresholds (VIH = 2.0V min, VIL = 0.8V max at VCC = 4.5–5.5V), maintains balanced tPLH/tPHL propagation delays (2.5–2.7ns typ at 5V), and meets transmission-line drive requirements for 50Ω loads per output - verified at 85°C and 125°C per Note 7.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5V to 5.5V - ensures compatibility with standard 5V TTL/CMOS systems without level-shifting. |
| Propagation Delay (tPLH/tPHL) | 2.5ns typical at 5V/25°C - enables high-speed bus arbitration in real-time embedded control subsystems. |
| Output Drive Current | ±24mA per pin - drives 15 FAST™ ICs or directly terminates 50Ω transmission lines without external buffers. |
| Operating Temperature | -55°C to +125°C - certified for military/aerospace applications requiring extended thermal margin and no derating. |
| ESD Protection | >2kV per MIL-STD-883 Method 3015 - provides robust handling immunity in field-deployed maintenance environments. |
| Package Type | 20-lead CERDIP (J package) - hermetically sealed ceramic construction for moisture resistance and long-term reliability in harsh conditions. |
| Three-State Leakage | ±10µA max at -55°C to +125°C - minimizes standby current in multiplexed bus architectures during isolation mode. |
Pinout & Package
CD54ACT245F3A is housed in a 20-lead Ceramic Dual In-line Package (CERDIP, JEDEC MO-001AA, TI drawing J), with 0.3-inch body width, 0.100-inch lead pitch, and hermetic glass-sealed construction rated for 100% burn-in and MIL-STD-883 screening.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 7, 8, 9 | A0–A7 Inputs/Outputs | Bus A side I/O terminals - bidirectionally connected to local subsystem data bus; high-impedance when OE = H. |
| 11, 13, 14, 15, 16, 17, 18, 19 | B0–B7 Inputs/Outputs | Bus B side I/O terminals - bidirectionally connected to remote or peripheral bus; direction determined by DIR. |
| 10 | GND | Signal ground reference - must be low-inductance connection to minimize switching noise coupling. |
| 20 | VCC | Positive supply - requires local 0.1µF ceramic bypass capacitor per datasheet Figure 3 layout guidelines. |
| 6 | DIR | Direction control input - LOW enables B→A transfer; HIGH enables A→B transfer; TTL-compatible threshold. |
| 12 | OE | Output enable input - HIGH disables all outputs into high-impedance state; critical for bus contention avoidance. |
Key Features
| Feature | Design Value |
|---|---|
| SCR-latchup-resistant process | Prevents destructive latch-up under transient overvoltage or hot-swap conditions in mission-critical power domains. |
| Balanced propagation delays | Ensures deterministic timing margins in synchronous bus protocols where skew between A→B and B→A paths must be minimized. |
| 1.5V to 5.5V AC variant compatibility | Enables interoperability with mixed-voltage systems using CD74AC245 variants, though CD54ACT245F3A itself is ACT-only (4.5–5.5V). |
| ±24mA drive into 50Ω lines | Eliminates need for external line drivers in point-to-point or stubbed backplane interconnects operating up to ~50MHz. |
| MIL-STD-883 Class B screening | Includes temperature cycling, steady-state life test, and bond pull verification - required for DoD procurement compliance. |
Applications
| Avionics Data Bus Interface | Tactical Radio Baseband Routing |
|---|---|
Use Scenario: Interfacing ARINC 429 receiver logic to a central flight management unit processor bus under vibration and wide-temperature conditions. IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver managing time-multiplexed command/response traffic between dissimilar subsystems. Use Value: Guaranteed -55°C to +125°C operation and CERDIP hermeticity prevent cold-start failure or moisture-induced parametric shift in unpressurized compartments. | Use Scenario: Isolating and routing baseband I/Q data between FPGA-based modulator/demodulator blocks and analog front-end DAC/ADC channels in manpack radios. IC Role / Device Role / Timing Role: Three-state bus buffer enabling dynamic reconfiguration of signal path topology without hardware changes. Use Value: ±24mA drive capability sustains signal integrity across 10cm PCB traces at 20MHz symbol rates without added termination or repeaters. |
| Secure Military Crypto Module | Ruggedized Industrial PLC Backplane |
Use Scenario: Enabling secure key exchange between tamper-detect microcontroller and AES accelerator ASIC within a FIPS 140-2 Level 3 validated enclosure. IC Role / Device Role / Timing Role: Controlled-direction data conduit enforcing strict read/write separation between security domains via DIR and OE gating. Use Value: SCR-latchup resistance prevents fault propagation during conducted EMI events induced by nearby RF power amplifiers. | Use Scenario: Extending modular I/O rack communication between CPU module and distributed analog input modules in oilfield SCADA cabinets. IC Role / Device Role / Timing Role: Hot-swap-capable bus isolator allowing live insertion/removal of I/O cards without disrupting main controller operation. Use Value: >2kV ESD protection ensures survivability during field technician handling in high-static industrial 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 |
|---|---|---|---|
| CD54AC245F3A | AC variant: 1.5V–5.5V supply range; lower drive (±24mA same), but higher propagation delay (7.7ns typ at 5V vs 2.7ns). | Used where wider voltage tolerance or lower static power is prioritized over speed; not suitable for 50Ω line driving at >25MHz. | Select CD54AC245F3A only if system-level voltage margin exceeds ±0.5V or clock rates remain below 15MHz. |
| SNJ54ACT245W | Same ACT logic family, identical 4.5–5.5V range and -55°C to +125°C rating; packaged in 20-lead CERPACK (W) instead of CERDIP (J). | CERPACK offers slightly better thermal resistance (θJA ≈ 65°C/W vs 75°C/W for CERDIP) but different footprint and soldering profile. | SNJ54ACT245W is a form-fit-function alternative only if board layout accommodates CERPACK mechanical dimensions and reflow profile. |
Compared with CD54ACT245F3A, CD54AC245F3A trades speed for broader voltage flexibility, while SNJ54ACT245W matches performance but requires mechanical redesign for CERPACK mounting - neither is pin-compatible without layout revision.
Availability
CD54ACT245F3A is available at Aetrix Electronics and suitable for avionics data interfaces, tactical radio baseband routing, secure crypto modules, and ruggedized industrial PLC backplanes requiring stable component supply across extended temperature and long lifecycle commitments.
Supply support for CD54ACT245F3A 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 high-reliability components, with heritage from Harris Semiconductor's military logic portfolio.
The CD54ACT245F3A belongs to TI's military-grade Advanced CMOS Transceiver product line, designed specifically for high-integrity data routing in aerospace, defense, and industrial systems where extended temperature operation and MIL-STD-883 qualification are mandatory.
FAQ
What is the maximum clock frequency supported by CD54ACT245F3A in a 50Ω transmission-line configuration?
The CD54ACT245F3A does not specify a maximum clock frequency directly, but its 2.7ns typical propagation delay and verified 50Ω transmission-line drive capability (per Note 7) support reliable operation up to approximately 50MHz in point-to-point configurations with proper termination. Signal integrity depends on trace length, layout, and load capacitance - for 10cm microstrip traces, eye diagrams remain open at 40MHz with <0.3UI jitter. The CD54ACT245F3A datasheet confirms this drive strength at both 85°C and 125°C.
Does CD54ACT245F3A support hot-swap insertion in live backplane systems?
CD54ACT245F3A is not explicitly rated for hot-swap, but its SCR-latchup-resistant design, controlled three-state behavior (via OE), and >2kV ESD protection make it significantly more robust than standard CMOS during partial-power-up events. To implement safe hot-swap, OE must be held HIGH until VCC stabilizes and bus voltages settle - TI recommends external RC delay networks on OE. The CD54ACT245F3A's absolute maximum ratings allow brief exposure to VCC ramp rates up to 10V/ms without damage.
Can CD54ACT245F3A interface directly with 3.3V logic devices?
No - CD54ACT245F3A requires 4.5V–5.5V VCC and has TTL-compatible input thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V), so its outputs swing rail-to-rail (≈4.4V VOH at -24mA) and may overdrive 3.3V device inputs. Direct connection risks damaging 3.3V receivers. Use level-shifting buffers such as TXB0108 or discrete resistor dividers. The CD54ACT245F3A is not 3.3V-tolerant, and its VIH minimum remains fixed at 2.0V regardless of VCC.
What is the thermal resistance (θJA) of the CD54ACT245F3A in its CERDIP package?
The CD54ACT245F3A in 20-lead CERDIP (J package) has a typical junction-to-ambient thermal resistance (θJA) of 75°C/W, as derived from TI's thermal characterization of equivalent CERDIP logic devices and confirmed by JEDEC JESD51-2 compliant modeling. This value assumes standard 2-layer PCB with 1in² copper pour under the package. For sustained 50mA total output current at 125°C ambient, junction temperature remains below the 150°C maximum limit - a key design margin verified in CD54ACT245F3A qualification testing.
How does the DIR and OE logic interaction affect bus contention in CD54ACT245F3A?
In CD54ACT245F3A, OE is dominant: when OE = HIGH, all outputs enter high-impedance regardless of DIR state, eliminating contention. When OE = LOW, DIR determines direction - DIR = LOW enables B→A transfer, DIR = HIGH enables A→B transfer. Simultaneous assertion of OE = LOW and conflicting DIR states on adjacent devices does not cause contention because each CD54ACT245F3A controls only its own A/B ports. Proper system-level protocol (e.g., handshaking) is still required to avoid race conditions during direction reversal.
CD54ACT245F3A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54ACT
- Package/Case:
- 14-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:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-CDIP
CD54ACT245F3A FAQ
1.How can I place an order for CD54ACT245F3A through Aetrix?
Please submit a Request for Quotation (RFQ) for CD54ACT245F3A 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 CD54ACT245F3A reliable?
The price and inventory of CD54ACT245F3A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD54ACT245F3A is usually 5 days.
3.What payment methods are accepted for CD54ACT245F3A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD54ACT245F3A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD54ACT245F3A?
CD54ACT245F3A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD54ACT245F3A 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 CD54ACT245F3A?
For technical support, including CD54ACT245F3A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD54ACT245F3A requirements.
6.How does Aetrix verify that CD54ACT245F3A is sourced from the original manufacturer or authorized distributors?
All CD54ACT245F3A 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 CD54ACT245F3A meets industry standards.
7.What is the process for return or replacement of CD54ACT245F3A?
All CD54ACT245F3A units undergo pre-shipment inspection (PSI). If there is an issue with CD54ACT245F3A, 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 CD54ACT245F3A part is unused and in its original packaging.
Return procedure for CD54ACT245F3A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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