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NXP Semiconductors 74HCT652N,112
- Part No.:
- 74HCT652N,112
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-DIP (0.600", 15.24mm)
- Datasheet:
-
74HCT652N,112.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,139
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Product details
Overview
74HCT652N,112 from NXP Semiconductors (formerly Philips) is an octal bus transceiver/register with independent 3-state control for A↔B bidirectional data flow, real-time or clocked storage mode selection, and Schmitt-trigger clock inputs. It operates at VCC = 4.5–5.5 V, supports 92 MHz max clock frequency, delivers bus-driver output capability, and is pin-compatible with LSTTL logic families.
For engineers reviewing the 74HCT652N,112 datasheet, 74HCT652N,112 pinout, 74HCT652N,112 application, or 74HCT652N,112 equivalent, this device serves as a dual-bus management IC in legacy industrial control backplanes, memory-mapped I/O expansion interfaces, and synchronous data multiplexing systems requiring isolated register staging and direction-controlled 3-state drive.
Technical Context
The 74HCT652N,112 integrates eight non-inverting transceiver channels with D-type flip-flops per bus, enabling concurrent A→B and B→A stored-data transfer - a functional distinction from the 74HCT646. Its dual clock inputs (CPAB, CPBA) and dual select inputs (SAB, SBA) allow independent real-time pass-through or registered storage per direction.
Schmitt-trigger action on CPAB and CPBA inputs ensures robust timing with slow-rising clock edges. Output enable pins OEAB and OEBA provide asymmetric 3-state control: OEAB LOW blocks A→B transmission; OEBA HIGH blocks B→A transmission - supporting flexible bus arbitration without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - compatible with standard TTL-level supply rails and immune to 5 V ±10% variation |
| fmax | 92 MHz - supports high-speed synchronous bus handshaking in legacy microprocessor systems |
| tPLH/tPZL (An→Bn) | 13 ns @ VCC = 5 V, CL = 15 pF - enables sub-15 ns propagation for tight timing budgets |
| tPHZ/tPLZ (OEAB→Bn) | 12 ns @ VCC = 5 V - allows rapid bus release for time-critical arbitration cycles |
| CI | 3.5 pF - low input capacitance minimizes loading on driving logic stages |
| CPD | 28 pF - used to calculate dynamic power: PD = CPD × VCC² × fi + Σ(CL × VCC² × fo) |
| Output Type | 3-state bus driver - provides high-current drive (±6 mA) and high-impedance isolation for shared bus topologies |
Pinout & Package
74HCT652N,112 uses a 24-pin plastic DIL (Dual In-line) package per SOT101L outline, with 2.54 mm pitch and through-hole mounting compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CPAB (Pin 1) | A-to-B clock input | Triggers storage of A-bus data into internal D-flip-flop for later B-bus output |
| SAB (Pin 2) | A-to-B select input | Controls real-time (SAB = H) vs. registered (SAB = L) A→B data path |
| OEAB (Pin 3) | A-to-B output enable | OEAB = L enables A→B outputs; OEAB = H forces high-impedance state |
| A0–A7 (Pins 4–11) | A-bus I/O terminals | Bidirectional data lines - driven by A-side logic or loaded from B-side when enabled |
| GND (Pin 12) | Ground reference | 0 V return for all internal logic and output drivers |
| B7–B0 (Pins 13–20) | B-bus I/O terminals | Bidirectional data lines - driven by B-side logic or loaded from A-side when enabled |
| OEBA (Pin 21) | B-to-A output enable | OEBA = L enables B→A outputs; OEBA = H forces high-impedance state |
| SBA (Pin 22) | B-to-A select input | Controls real-time (SBA = H) vs. registered (SBA = L) B→A data path |
| CPBA (Pin 23) | B-to-A clock input | Triggers storage of B-bus data into internal D-flip-flop for later A-bus output |
| VCC (Pin 24) | Positive supply | 5 V nominal supply - powers all logic, registers, and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent register banks | Enables simultaneous A→B and B→A stored-data transfer - unlike 74HCT646 which lacks concurrent bidirectional register access |
| Schmitt-trigger clock inputs | CPAB and CPBA tolerate slow-rising/falling edges (e.g., RC-generated clocks), eliminating need for external waveform conditioning |
| Asymmetric 3-state control | OEAB and OEBA operate independently - permits one-directional bus drive while holding the opposite direction in high-Z |
| Multiplexed real-time + stored operation | Select pins (SAB/SBA) and clock pins (CPAB/CPBA) decouple data path mode from enable state - simplifies bus arbitration logic |
| LSTTL pin compatibility | Matches 74LS652 pinout and voltage thresholds - enables drop-in replacement in legacy TTL designs without PCB changes |
Applications
| Industrial Backplane Interface | Memory-Mapped I/O Expansion |
|---|---|
Use Scenario: Connecting multiple microcontroller modules to a shared parallel backplane in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Bidirectional bus transceiver with register staging to isolate CPU address/data buses from peripheral modules during configuration cycles. Use Value: Prevents bus contention during hot-swap events using independent OEAB/OEBA control and eliminates metastability via registered clocked transfers. |
Use Scenario: Expanding 8-bit microcontroller I/O ports to support external peripherals like ADCs, DACs, and GPIO expanders via memory-mapped addressing. IC Role / Device Role / Timing Role: Octal transceiver providing direction-controlled data routing between MCU data bus and peripheral data lines, with register hold for setup/hold timing compliance. Use Value: Enables synchronous handshake-free peripheral access using stored data mode, reducing software overhead for timing-critical reads/writes. |
| Synchronous Data Multiplexer | Legacy System Bus Arbitration |
Use Scenario: Routing sensor data streams from dual redundant A/B sensor sets to a single processing unit in avionics monitoring systems. IC Role / Device Role / Timing Role: Dual-register transceiver allowing concurrent capture of A-sensor and B-sensor data, then synchronized output to processor bus. Use Value: Eliminates need for external multiplexer logic and guarantees atomic A/B data transfer via single-cycle CPAB+CPBA assertion. |
Use Scenario: Managing shared address/data bus access among multiple DMA controllers in a 1980s-era minicomputer architecture. IC Role / Device Role / Timing Role: 3-state bus interface with independent OEAB/OEBA enabling precise bus grant/release sequencing without race conditions. Use Value: Provides deterministic bus release timing (tPHZ = 12 ns) critical for meeting legacy DMA cycle timing requirements. |
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 |
|---|---|---|---|
| 74HCT646N,112 | Lacks concurrent A↔B register transfer capability; supports only unidirectional register load or real-time pass-through per cycle | Not suitable for applications requiring simultaneous A→B and B→A stored-data exchange | Select 74HCT646N,112 only when simpler bus isolation suffices and dual-register concurrency is unnecessary |
| SN74HCT652N | Identical logic function and pinout; manufactured by Texas Instruments with identical AC/DC specs and JEDEC 7A compliance | Drop-in replacement with same thermal profile and layout compatibility | Choose SN74HCT652N when TI-sourced components are required for supply chain diversification or qualification consistency |
Compared with 74HCT652N,112, the 74HCT646N,112 omits dual-register concurrency - limiting use in synchronized bidirectional staging - while SN74HCT652N offers identical functionality with alternate sourcing, making it a true pin-compatible alternative for continuity planning.
Availability
74HCT652N,112 is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory-mapped I/O expansion, synchronous data multiplexing, and legacy system bus arbitration requiring stable component supply across long-lifecycle embedded programs.
Supply support for 74HCT652N,112 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Philips' pioneering logic IC development.
The 74HCT652N,112 belongs to NXP's legacy 74HCT family - designed specifically for TTL-compatible, low-power CMOS interfacing in industrial control, test equipment, and retro-computing systems where reliability and long-term availability are critical.
FAQ
What is the supply voltage range for the 74HCT652N,112?
The 74HCT652N,112 operates over a VCC range of 4.5 V to 5.5 V. This range ensures compatibility with standard 5 V TTL systems while maintaining noise immunity and stable 3-state output behavior. The device meets JEDEC Standard No. 7A under these conditions, and its DC characteristics are specified for VCC = 4.5 V, 5.0 V, and 5.5 V across temperature ranges from −40 °C to +125 °C.
Does the 74HCT652N,112 support concurrent A→B and B→A registered data transfer?
Yes, the 74HCT652N,112 uniquely supports simultaneous A→B and B→A stored-data transfer - a feature distinguishing it from the 74HCT646. When both CPAB and CPBA receive LOW-to-HIGH transitions and OEAB/OEBA are active, the 74HCT652N,112 loads A-bus data into the B-register and B-bus data into the A-register in the same clock cycle, enabling atomic bidirectional staging.
What is the maximum clock frequency supported by the 74HCT652N,112?
The 74HCT652N,112 supports a maximum clock frequency of 92 MHz at VCC = 5 V and Tamb = 25 °C with CL = 15 pF. At extended temperatures (−40 °C to +125 °C) and VCC = 4.5 V, the guaranteed fmax drops to 83 MHz. This specification applies to both CPAB and CPBA inputs and is validated per the AC characteristics table in the original Philips datasheet.
How does the 74HCT652N,112 handle bus contention during direction switching?
The 74HCT652N,112 prevents bus contention using independent 3-state control via OEAB and OEBA. When OEAB is HIGH, A→B outputs go high-impedance regardless of SAB or CPAB state; similarly, OEBA HIGH disables B→A outputs. This allows safe direction reversal without overlap - verified by tPHZ = 12 ns and tPZH = 15 ns disable/enable times at VCC = 5 V.
Is the 74HCT652N,112 pin-compatible with TTL logic families?
Yes, the 74HCT652N,112 is pin-compatible with Low Power Schottky TTL (LSTTL) devices such as the 74LS652. Its HCT input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) match TTL voltage levels, and its output drive strength (IOH/IOL = ±6 mA) meets LSTTL fan-out requirements - enabling direct replacement in legacy designs without layout modification.
74HCT652N,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- Package/Case:
- 24-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 24-DIP
74HCT652N,112 FAQ
1.How can I place an order for 74HCT652N,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT652N,112 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 74HCT652N,112 reliable?
The price and inventory of 74HCT652N,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT652N,112 is usually 5 days.
3.What payment methods are accepted for 74HCT652N,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT652N,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT652N,112?
74HCT652N,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT652N,112 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 74HCT652N,112?
For technical support, including 74HCT652N,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT652N,112 requirements.
6.How does Aetrix verify that 74HCT652N,112 is sourced from the original manufacturer or authorized distributors?
All 74HCT652N,112 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 74HCT652N,112 meets industry standards.
7.What is the process for return or replacement of 74HCT652N,112?
All 74HCT652N,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT652N,112, 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 74HCT652N,112 part is unused and in its original packaging.
Return procedure for 74HCT652N,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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