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Texas Instruments SN74HCT652NT
- Part No.:
- SN74HCT652NT
- Manufacturer:
- Texas Instruments
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74HCT652NT.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,960
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Product details
Overview
SN74HCT652NT from Texas Instruments is an octal bus transceiver and register IC with 3-state outputs, operating at 4.5 V to 5.5 V, delivering 12 ns typical propagation delay, ±6-mA output drive, and low 80-µA max ICC. It enables bidirectional real-time or stored data transfer between two 8-bit buses in industrial control backplanes and legacy microprocessor system expansion interfaces.
For engineers reviewing the SN74HCT652NT datasheet, SN74HCT652NT pinout, SN74HCT652NT application, or SN74HCT652NT equivalent, key selection considerations include dual-clock edge-triggered register storage, independent A/B bus enable controls (OEAB/OEBA), TTL-compatible inputs, and high-current 3-state outputs capable of driving up to 15 LSTTL loads.
Technical Context
The SN74HCT652NT integrates eight identical bidirectional channels, each with D-type flip-flops clocked by separate CLKAB and CLKBA inputs, allowing independent latching of A- or B-bus data on rising edges. Select-control inputs SAB and SBA determine whether real-time or registered data propagates across the transceiver path.
Output-enable inputs OEAB and OEBA operate independently to place either bus side into high-impedance state, enabling isolation, bus sharing, or simultaneous storage without register use when both OEs are active. Input clamping and thermal characteristics (θJA = 67°C/W for NT package) support stable operation in dense PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V TTL/CMOS logic rails and tolerant of supply ripple. |
| Propagation Delay | 12 ns typical (VCC = 5.5 V, CL = 50 pF) - supports synchronous bus timing up to ~22 MHz clock frequency. |
| Output Drive | ±6 mA at 5 V - sufficient to directly drive 15 LSTTL loads without external buffers. |
| Input Current | 1 µA max - ensures minimal loading on upstream logic and compatibility with high-impedance control lines. |
| ICC (Max) | 80 µA - enables low-static-power operation in always-on system management functions. |
| Operating Temp | –40°C to +85°C - qualified for industrial temperature range applications including PLC I/O modules. |
| Logic Family | HCT - TTL-input compatible with CMOS power efficiency; no level-shifting required when interfacing with 74LS or 74F devices. |
Pinout & Package
SN74HCT652NT is housed in a 24-pin plastic dual in-line package (PDIP-NT), with 0.3-inch body width and through-hole mounting. Pin 1 is located at the top-left corner (notch-down orientation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLKAB | Rising-edge clock for storing data from A bus into internal register; triggers A→B or A↔B storage. |
| 2 | SAB | Select control for A→B path: low = real-time A-to-B transfer, high = stored A-data-to-B transfer. |
| 3 | OEAB | Output enable for A-side drivers: low = A outputs active, high = A outputs in high-Z state. |
| 4–11 | A1–A8 | 8-bit data input/output port A - bidirectional I/O pins connected to primary system bus or CPU data lines. |
| 12 | GND | Ground reference for all logic and output circuitry; must be low-inductance connection for noise immunity. |
| 13 | VCC | Positive supply rail (4.5–5.5 V); requires local 0.1-µF ceramic decoupling adjacent to pin. |
| 14 | CLKBA | Rising-edge clock for storing data from B bus into internal register; triggers B→A or A↔B storage. |
| 15 | SBA | Select control for B→A path: low = real-time B-to-A transfer, high = stored B-data-to-A transfer. |
| 16 | OEBA | Output enable for B-side drivers: low = B outputs active, high = B outputs in high-Z state. |
| 17–24 | B1–B8 | 8-bit data input/output port B - bidirectional I/O pins connected to peripheral bus, memory bank, or expansion slot. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent clock domains | Separate CLKAB and CLKBA inputs allow asynchronous latching of A and B bus data without cross-dependency. |
| Multiplexed real-time/stored data paths | SAB/SBA select lines enable dynamic switching between live bus traffic and registered snapshot data per direction. |
| True bidirectional 3-state control | Independent OEAB and OEBA permit selective isolation of either bus while maintaining register state integrity. |
| TTL-compatible inputs | VIH = 2.0 V min / VIL = 0.8 V max eliminates need for external level shifters when interfacing with legacy 74LS systems. |
| High-noise-immunity design | Input clamp current ±20 mA and absolute max ratings up to 7 V supply ensure robustness against ESD and transient coupling. |
Applications
| Industrial Backplane Interface | Microprocessor System Expansion |
|---|---|
|
Use Scenario: Interfacing a main CPU bus to isolated I/O module slots in programmable logic controllers (PLCs) with hot-swap capability. IC Role / Device Role / Timing Role: Bidirectional bus transceiver and latch that isolates CPU address/data during module insertion/removal and holds last valid state via register storage. Use Value: Prevents bus contention during field maintenance; enables deterministic state recovery after reconnection using stored register values. |
Use Scenario: Adding parallel memory or peripheral interfaces to 8-bit microcontrollers (e.g., 8051, Z80) with limited address/data bus drive strength. IC Role / Device Role / Timing Role: Octal buffer/register that extends data bus drive capability and provides synchronized latch points for memory-mapped peripherals. Use Value: Eliminates need for discrete latches and buffers; reduces component count while supporting precise timing control via dedicated clocks. |
| Legacy Bus Arbitration Logic | Test Equipment Data Capture |
|
Use Scenario: Managing shared access between multiple masters (e.g., DMA controller and CPU) on a common ISA-style 8-bit data bus. IC Role / Device Role / Timing Role: Directional bus isolator with real-time pass-through and stored arbitration state retention during master handoff. Use Value: Enables glitch-free bus ownership transition by holding prior master's data in registers while new master asserts control. |
Use Scenario: Capturing parallel digital signals from DUTs in automated test equipment (ATE) with precise timestamp alignment. IC Role / Device Role / Timing Role: Synchronized data sampler that latches parallel bus values on external trigger (CLKAB/CLKBA) and holds until readout. Use Value: Provides deterministic capture window with sub-20 ns setup/hold margins; supports repeatable waveform reconstruction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver and register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT640N | Octal transceiver only - no internal registers; lacks CLKAB/CLKBA, SAB/SBA, and storage functionality. | Suitable for simple bidirectional buffering without data retention; cannot replace SN74HCT652NT where register hold is required. | Select SN74HCT640N only if real-time-only transfer suffices and board layout allows removal of clock/select logic. |
| SN74ACT652N | Faster propagation delay (typ. 8.5 ns), higher drive (±24 mA), but requires 4.5–5.5 V and has higher ICC (max 4 mA). | Better suited for high-speed timing-critical designs; not drop-in due to increased power and potential signal integrity impact. | Choose SN74ACT652N when tpd < 10 ns is mandatory and thermal/power budget permits higher dissipation. |
Compared with SN74HCT640N, the SN74HCT652NT adds essential register storage and dual-clock control for deterministic bus state management; compared with SN74ACT652N, it trades speed for lower static power and broader noise margin in industrial environments.
Availability
SN74HCT652NT is available at Aetrix Electronics and suitable for industrial automation backplanes, microprocessor expansion interfaces, legacy bus arbitration systems, and test equipment data capture requiring stable component supply over extended production lifecycles.
Supply support for SN74HCT652NT 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 logic solutions with over 50 years of industrial-grade product heritage.
The SN74HCT652NT belongs to TI's HCT logic family, designed specifically for seamless interoperability between TTL and CMOS systems in cost-sensitive, noise-resilient industrial control applications.
FAQ
What is the function of the SAB and SBA pins on the SN74HCT652NT?
The SAB pin controls data flow direction from bus A to bus B: when low, real-time A data passes to B; when high, stored A data transfers to B. Similarly, SBA selects real-time (low) or stored (high) B-to-A transfer. These inputs operate independently, enabling asymmetric data routing modes in the SN74HCT652NT without requiring clock edges.
Can the SN74HCT652NT operate reliably at 3.3 V?
No - the SN74HCT652NT is specified only for 4.5 V to 5.5 V operation per its recommended conditions. At 3.3 V, VIH/VIL thresholds are not met, input recognition fails, and output drive falls outside specification. For 3.3-V systems, consider TI's SN74LVC652 or similar LVC-family alternatives instead of the SN74HCT652NT.
How does the SN74HCT652NT handle power-up sequencing to avoid bus contention?
To ensure high-impedance outputs at power-up, OEBA should be tied to VCC via a pullup resistor and OEAB to GND via a pulldown resistor. This forces both bus sides into tri-state before internal logic stabilizes. The minimum resistor value depends on driver sink/source capability - typically 1–10 kΩ suffices for the SN74HCT652NT.
Does the SN74HCT652NT support simultaneous storage of data on both A and B buses?
Yes - asserting low-to-high transitions on both CLKAB and CLKBA while SAB and SBA are in real-time mode (low) stores A-bus data into the A register and B-bus data into the B register concurrently. The SN74HCT652NT's dual-clock architecture enables this coordinated latching without interlock timing constraints.
What is the maximum capacitive load the SN74HCT652NT can drive while maintaining specified timing?
The SN74HCT652NT's timing parameters (e.g., tpd = 12 ns typ.) are characterized at CL = 50 pF. At CL = 150 pF, tpd increases to 20 ns (VCC = 5.5 V). Driving >150 pF risks violating setup/hold windows in high-speed systems; for heavier loads, add series termination or buffer stages rather than exceeding the SN74HCT652NT's rated drive capability.
SN74HCT652NT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-PDIP
SN74HCT652NT FAQ
1.How can I place an order for SN74HCT652NT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT652NT 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 SN74HCT652NT reliable?
The price and inventory of SN74HCT652NT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT652NT is usually 5 days.
3.What payment methods are accepted for SN74HCT652NT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCT652NT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HCT652NT?
SN74HCT652NT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT652NT 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 SN74HCT652NT?
For technical support, including SN74HCT652NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT652NT requirements.
6.How does Aetrix verify that SN74HCT652NT is sourced from the original manufacturer or authorized distributors?
All SN74HCT652NT 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 SN74HCT652NT meets industry standards.
7.What is the process for return or replacement of SN74HCT652NT?
All SN74HCT652NT units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT652NT, 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 SN74HCT652NT part is unused and in its original packaging.
Return procedure for SN74HCT652NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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