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NXP Semiconductors 74HCT652D,118
- Part No.:
- 74HCT652D,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74HCT652D,118.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,299
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Product details
Overview
74HCT652D,118 from NXP Semiconductors (formerly Philips) is an octal bus transceiver/register with independent A/B register storage, 3-state outputs, and dual-direction clocked data transfer capability. It operates at 4.5–5.5 V, supports up to 92 MHz clock frequency, features Schmitt-trigger clock inputs, and is used in bidirectional bus interface applications requiring real-time or registered data routing between two 8-bit buses.
For engineers reviewing the 74HCT652D,118 datasheet, 74HCT652D,118 pinout, 74HCT652D,118 application, or 74HCT652D,118 equivalent, key selection criteria include independent A/B clock enable (CPAB/CPBA), separate output enables (OEAB/OEBA), select-controlled real-time vs. registered mode, and SO-24 package compatibility with legacy TTL bus systems.
Technical Context
The 74HCT652D,118 implements dual 8-bit non-inverting transceivers with integrated D-type flip-flops per data path, enabling simultaneous storage of A-bus and B-bus data on independent clock edges. Its logic architecture supports four operational modes-real-time A→B, real-time B→A, stored-A→B + stored-B→A, and isolated bus hold-controlled by SAB/SBA and OEAB/OEBA.
Schmitt-trigger inputs on CPAB and CPBA provide noise immunity for slow-rising clock signals, while HCT-level input thresholds (GND to 3 V) ensure TTL-compatible interfacing. The device meets JEDEC Standard No. 7A and is fully pin-compatible with LSTTL, allowing drop-in replacement in legacy 5 V bus systems without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures robust operation across industrial 5 V rails with ±10% tolerance |
| Max Clock Frequency | 92 MHz - supports high-speed synchronous bus arbitration in microprocessor peripheral interfaces |
| Propagation Delay (An→Bn) | 13 ns @ VCC = 5 V, CL = 15 pF - enables sub-10 ns timing margins in 80 MHz system designs |
| 3-State Enable Time | 15 ns (OEAB/OEBA → Bn/An) - guarantees fast bus turnaround for time-critical DMA transfers |
| Input Capacitance | 3.5 pF - minimizes loading on driving logic and preserves signal integrity on dense PCB traces |
| Power Dissipation Cap. | 28 pF per channel - used to calculate dynamic power: PD = CPD × VCC² × fi + Σ(CL × VCC² × fo) |
Pinout & Package
74HCT652D,118 is housed in a 24-pin Small Outline (SO) plastic package (SOT137A), 7.5 mm wide, with 0.65 mm pitch and gull-wing leads suitable for surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CPAB (Pin 1) | A-to-B clock input | Triggers storage of A-bus data into internal D-flip-flops for later B-bus output |
| SAB (Pin 2) | A-to-B select input | Controls real-time (L) or registered (H) A→B data path; active-low logic |
| OEAB (Pin 3) | A-to-B output enable | Enables/disables B-bus drivers when LOW; HIGH forces high-impedance state |
| A0–A7 (Pins 4–11) | A-bus I/O terminals | Bidirectional data lines shared between A-side logic and internal registers |
| GND (Pin 12) | Ground reference | 0 V return path for all internal logic and output drivers |
| B7–B0 (Pins 13–20) | B-bus I/O terminals | Bidirectional data lines shared between B-side logic and internal registers |
| OEBA (Pin 21) | B-to-A output enable | Enables/disables A-bus drivers when LOW; HIGH forces high-impedance state |
| SBA (Pin 22) | B-to-A select input | Controls real-time (L) or registered (H) B→A data path; active-low logic |
| CPBA (Pin 23) | B-to-A clock input | Triggers storage of B-bus data into internal D-flip-flops for later A-bus output |
| VCC (Pin 24) | Positive supply | 5 V nominal supply powering all logic, registers, and bus drivers |
Key Features
| Feature | Design Value |
|---|---|
| Independent A/B register storage | Allows concurrent capture of data from both buses on separate clock edges, enabling synchronized cross-bus exchange |
| Dual-direction 3-state control | Separate OEAB and OEBA pins permit asymmetric bus drive-e.g., A→B enabled while B→A disabled-to prevent contention |
| Real-time + registered mode selection | SAB/SBA inputs let designers choose transparent pass-through or clock-synchronized latching per direction without external logic |
| Schmitt-trigger clock inputs | CPAB and CPBA tolerate slow-rising or noisy clock edges (e.g., from RC oscillators or long traces), reducing need for external conditioning |
| LSTTL pin compatibility | Direct replacement for 74LS652 in existing 5 V systems-no PCB redesign required for voltage or pinout |
Applications
| Microprocessor System Bus Interface | Industrial PLC Backplane Interconnect |
|---|---|
Use Scenario: Connecting a CPU data bus to a peripheral expansion bus with arbitration between multiple masters. IC Role / Device Role / Timing Role: Bidirectional registered transceiver managing time-aligned data flow between CPU and I/O modules using CPAB/CPBA clocks. Use Value: Eliminates need for external latch + buffer combinations; reduces component count and board space by integrating register + driver + 3-state control. | Use Scenario: Isolating and synchronizing data between redundant controller modules in a safety-critical PLC rack. IC Role / Device Role / Timing Role: Dual-clock bus register ensuring deterministic, glitch-free handoff of status and command data between hot-swappable controllers. Use Value: Prevents bus contention during module insertion/removal via independent OEAB/OEBA control and high-impedance isolation. |
| Legacy Instrumentation Data Multiplexing | Test Equipment Signal Routing Matrix |
Use Scenario: Multiplexing sensor readings from eight analog front-ends onto a shared digital acquisition bus. IC Role / Device Role / Timing Role: Octal transceiver capturing parallel ADC outputs into internal registers before serial readout, decoupling sampling from bus timing. Use Value: Enables precise timestamp alignment of multi-channel measurements using CPAB edge-triggered storage. | Use Scenario: Configurable signal routing between DUT ports and measurement instruments in automated test systems. IC Role / Device Role / Timing Role: Reconfigurable bus interface supporting both real-time signal pass-through and buffered pattern replay via SAB/SBA mode selection. Use Value: Supports mixed-mode testing (e.g., live stimulus + captured response replay) without FPGA or microcontroller intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver/register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT646D,623 | Lacks simultaneous A↔B stored-data transfer; only supports unidirectional registered transfer per clock cycle | Not suitable for applications requiring concurrent A→B and B→A registered data exchange | Select 74HCT646D,623 only when simpler single-direction registered buffering suffices and cost is prioritized |
| SN74HCT652N | DIP-24 package (SOT101L); identical logic, timing, and DC specs but through-hole mounting | Used in prototyping, legacy repair, or low-volume through-hole assemblies where SO-24 reflow is impractical | Choose SN74HCT652N for breadboard evaluation or field-replacement of older DIP-based systems |
Compared with 74HCT652D,118, the 74HCT646D,623 offers lower gate count but omits dual-register concurrency, while SN74HCT652N delivers identical functionality in through-hole form-making the SO-24 variant optimal for space-constrained, high-density production boards requiring surface-mount reliability.
Availability
74HCT652D,118 is available at Aetrix Electronics and suitable for microprocessor bus interfaces, industrial PLC backplanes, legacy instrumentation multiplexing, and test equipment signal routing requiring stable component supply and long-term obsolescence mitigation.
Supply support for 74HCT652D,118 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
NXP Semiconductors is a global semiconductor leader delivering high-performance analog, logic, and automotive ICs, with roots in Philips' pioneering logic portfolio and strong focus on industrial and automotive reliability.
The 74HCT652D,118 belongs to the 74HCT family of TTL-compatible CMOS logic devices, designed specifically for robust 5 V bus interfacing in industrial control, test equipment, and legacy system upgrades where LSTTL replacement and noise-immune clocking are critical.
FAQ
What is the operating voltage range for the 74HCT652D,118?
The 74HCT652D,118 operates over a supply voltage range of 4.5 V to 5.5 V. This 5 V-centric specification ensures compatibility with standard TTL and LSTTL logic families while maintaining CMOS power efficiency. Operation outside this range may result in undefined behavior or increased quiescent current. All AC and DC parameters in the official NXP datasheet are guaranteed only within this window.
Does the 74HCT652D,118 support simultaneous bidirectional registered data transfer?
Yes, the 74HCT652D,118 uniquely supports concurrent stored-A→B and stored-B→A transfer on a single device. When both OEAB and OEBA are LOW and SAB = SBA = HIGH, clocking CPAB stores A-bus data while CPBA stores B-bus data-and both sets are driven onto opposite buses simultaneously. This capability distinguishes it from the 74HCT646 and is confirmed in the function table and application notes of the original Philips datasheet.
What package type is used for the 74HCT652D,118?
The 74HCT652D,118 uses a 24-pin Small Outline (SO) plastic package designated SOT137A. It features gull-wing leads, 0.65 mm pitch, and a 7.5 mm body width. This surface-mount package is RoHS-compliant and qualified for reflow soldering per J-STD-020, making it suitable for automated high-volume PCB assembly.
How does the 74HCT652D,118 handle clock input noise or slow edges?
The 74HCT652D,118 incorporates Schmitt-trigger circuitry on both CPAB and CPBA clock inputs. This provides hysteresis-typically 0.5 V threshold separation-which rejects noise below the hysteresis band and allows reliable triggering even with rise/fall times exceeding 100 ns. This eliminates the need for external RC filtering or dedicated clock conditioners in noisy industrial environments.
Is the 74HCT652D,118 pin-compatible with older TTL devices?
Yes, the 74HCT652D,118 is fully pin-compatible with the 74LS652 and meets JEDEC Standard No. 7A. Its HCT input thresholds (0–3 V) match TTL logic levels, and its output drive strength (±4 mA) meets LSTTL fan-out requirements. This allows direct replacement in existing 5 V systems without changes to PCB layout, firmware, or surrounding logic.
74HCT652D,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SO
74HCT652D,118 FAQ
1.How can I place an order for 74HCT652D,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT652D,118 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 74HCT652D,118 reliable?
The price and inventory of 74HCT652D,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT652D,118 is usually 5 days.
3.What payment methods are accepted for 74HCT652D,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT652D,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT652D,118?
74HCT652D,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT652D,118 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 74HCT652D,118?
For technical support, including 74HCT652D,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT652D,118 requirements.
6.How does Aetrix verify that 74HCT652D,118 is sourced from the original manufacturer or authorized distributors?
All 74HCT652D,118 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 74HCT652D,118 meets industry standards.
7.What is the process for return or replacement of 74HCT652D,118?
All 74HCT652D,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT652D,118, 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 74HCT652D,118 part is unused and in its original packaging.
Return procedure for 74HCT652D,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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