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Texas Instruments SN74BCT652NT
- Part No.:
- SN74BCT652NT
- Manufacturer:
- Texas Instruments
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74BCT652NT.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:990
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Product details
Overview
SN74BCT652NT from Texas Instruments is an octal bus transceiver and register IC with 3-state outputs, designed for bidirectional data routing between two 8-bit buses (A and B) while supporting real-time or stored data transfer. It features independent clock (CLKAB/CLKBA), select (SAB/SBA), and output-enable (OEAB/OEBA) controls, operates at 5 V, supports up to 77 MHz clock frequency, and is rated for 0°C to 70°C industrial temperature range.
For engineers reviewing the SN74BCT652NT datasheet, SN74BCT652NT pinout, SN74BCT652NT application, or SN74BCT652NT equivalent, key selection criteria include its dual-register architecture, glitch-free multiplexed bus control, BiCMOS low-ICCZ design, and compatibility with standard 5-V TTL logic systems in legacy computing and industrial backplane interfaces.
Technical Context
The SN74BCT652NT integrates eight identical bidirectional channels, each combining a D-type flip-flop register, transceiver path, and independent enable/select logic. Real-time vs. stored data selection is controlled by SAB/SBA inputs, with no decoding glitches during mode transitions due to dedicated synchronous select circuitry.
It supports four fundamental bus-management functions: real-time A→B and B→A transfer, simultaneous storage from A/B buses, and retrieval of stored data to either or both buses. Clock inputs (CLKAB/CLKBA) trigger edge-sensitive latching regardless of OE or S states, enabling transparent storage even during active bus operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL and CMOS systems without level-shifting. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial/industrial environments, excluding extended or military-grade use. |
| Max Clock Frequency | 77 MHz - Enables high-speed synchronous bus interfacing in legacy microprocessor and memory subsystems. |
| Output Drive (IOL) | 64 mA - Supports direct driving of multiple TTL loads or termination-resistor networks on parallel buses. |
| ICCZ (Quiescent Current) | 10–17 mA - Reduced standby power versus earlier bipolar-only transceivers, critical for dense backplane designs. |
| Propagation Delay (tPLH/tPHL) | 1.7–11.6 ns - Sub-12 ns timing enables cycle-accurate synchronization in 20+ ns bus cycles. |
| ESD Rating | >2000 V HBM - Meets MIL-STD-883C requirements, ensuring robustness during board handling and insertion. |
Pinout & Package
SN74BCT652NT is supplied in a 24-pin plastic DIP (Dual In-line Package) with 300-mil width, through-hole mounting, and industry-standard pin spacing (0.1 inch). The package supports manual soldering, socketing, and legacy PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLKAB | Clock input for latching data from A bus into internal register A; rising-edge triggered. |
| 2 | SAB | Select input controlling A→B path: low = real-time A data, high = stored A data. |
| 3 | OEAB | Output-enable for A→B direction: low = enabled (A drives B), high = 3-state (B isolated). |
| 4–11 | A1–A8 | 8-bit bidirectional data port A - connects to source system (e.g., CPU address/data bus). |
| 12 | GND | Ground reference for all internal circuitry and I/O signaling. |
| 13 | VCC | Positive supply rail (4.5–5.5 V); decoupling capacitor required near pin for noise suppression. |
| 14 | CLKBA | Clock input for latching data from B bus into internal register B; rising-edge triggered. |
| 15 | SBA | Select input controlling B→A path: low = real-time B data, high = stored B data. |
| 16 | OEBA | Output-enable for B→A direction: low = enabled (B drives A), high = 3-state (A isolated). |
| 17–24 | B1–B8 | 8-bit bidirectional data port B - connects to destination system (e.g., peripheral or memory bus). |
Key Features
| Feature | Design Value |
|---|---|
| Independent A/B registers and enables | Enables asymmetric bus control - e.g., store A while transferring B in real time, without mutual blocking. |
| Glitch-free select logic | Eliminates transient bus contention during SAB/SBA transitions, preventing data corruption in synchronous systems. |
| Power-up 3-state mode | Outputs default to high-impedance at power-on, preventing bus conflicts before system initialization completes. |
| BiCMOS process technology | Combines bipolar speed and CMOS input impedance, reducing ICCZ by >50% vs. pure bipolar predecessors. |
| Multiplexed real-time/stored data paths | Allows single device to serve as both buffer and latch - reduces component count in bus arbitration logic. |
Applications
| Legacy Microprocessor Bus Interface | Industrial Backplane Data Routing |
|---|---|
|
Use Scenario: Interfacing an 8086/80286 CPU data bus to dual-memory banks or peripheral controllers with shared address/data lines. IC Role / Device Role / Timing Role: Bidirectional transceiver and register that isolates CPU from memory/peripheral timing domains while latching addresses or control words. Use Value: Eliminates need for separate octal latches and transceivers, simplifying layout and reducing propagation skew across 16-bit data paths. |
Use Scenario: Managing data flow between redundant PLC modules on a DIN-rail-mounted backplane with hot-swap capability. IC Role / Device Role / Timing Role: Bus arbitrator and state-holding element that maintains last valid data during module insertion/removal sequences. Use Value: Prevents bus floating during reconfiguration via power-up 3-state and independent OE control per direction. |
| Test Equipment Signal Switching | Avionics Data Concentrator Interface |
|
Use Scenario: Routing stimulus/response signals between DUT (device under test) and ATE (automated test equipment) in boundary-scan or functional testers. IC Role / Device Role / Timing Role: Programmable bus gate with register hold, allowing test patterns to be preloaded and applied synchronously to multiple DUT pins. Use Value: Enables deterministic timing alignment across 8-bit test vectors using CLKAB/CLKBA edges, critical for setup/hold compliance. |
Use Scenario: Aggregating discrete sensor outputs (e.g., pressure, temperature) onto a centralized ARINC 429-compatible bus controller interface. IC Role / Device Role / Timing Role: Level-shifting and buffering element converting TTL-level sensor data to robust 5-V bus drivers with ESD-hardened I/O. Use Value: Delivers MIL-STD-883C-compliant ESD protection (>2000 V HBM) and stable drive strength across wide temperature excursions. |
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 |
|---|---|---|---|
| SN74ACT652N | AC-family CMOS; lower ICCZ (2 µA typical), higher noise immunity, but reduced drive (24 mA IOL), 4.5–5.5 V only. | Preferred for low-power, noise-sensitive digital systems; not suitable for driving heavy TTL loads or long traces. | Choose SN74ACT652N when power efficiency and noise rejection outweigh raw drive strength and legacy TTL compatibility. |
| SN74LS652N | LS-TTL family; slower (max 30 MHz), higher ICC (40 mA typical), no BiCMOS benefits, but pinout-identical and drop-in replaceable. | Used where strict LS-TTL voltage thresholds and timing margins are required, or for cost-sensitive legacy repairs. | Choose SN74LS652N only for exact LS-TTL system compliance or field replacement where SN74BCT652NT is obsolete and unavailable. |
Compared with SN74ACT652N and SN74LS652N, the SN74BCT652NT uniquely balances 77-MHz speed, 64-mA drive, and BiCMOS quiescent current reduction - making it optimal for performance-critical 5-V bus interfaces where both speed and load-driving capability are essential.
Availability
SN74BCT652NT is available at Aetrix Electronics and suitable for legacy computing upgrades, industrial backplane redesigns, and avionics interface modernization requiring stable component supply and long-term obsolescence mitigation.
Supply support for SN74BCT652NT 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 U.S.-based semiconductor leader founded in 1930, delivering analog, embedded processing, and logic solutions across automotive, industrial, and communications markets.
The SN74BCT652NT belongs to TI's BCT (Bipolar-CMOS Transceiver) logic family, engineered specifically for high-speed, low-noise, 5-V bus interfacing in systems demanding both TTL compatibility and improved power efficiency.
FAQ
What is the maximum clock frequency supported by the SN74BCT652NT?
The SN74BCT652NT supports a maximum clock frequency of 77 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C). This specification applies to both CLKAB and CLKBA inputs and ensures reliable edge-triggered latching of data into internal registers without setup/hold violations.
Does the SN74BCT652NT have built-in ESD protection, and what level is certified?
Yes, the SN74BCT652NT provides ESD protection exceeding 2000 V per MIL-STD-883C, Method 3015 (Human Body Model), and over 200 V using the Machine Model (C = 200 pF, R = 0). This level of protection is integrated into the BiCMOS process and requires no external components for basic handling robustness.
Can the SN74BCT652NT operate with a 3.3-V supply?
No, the SN74BCT652NT is specified only for 4.5 V to 5.5 V operation. Its BiCMOS architecture and TTL-compatible input thresholds (VIH = 2 V min, VIL = 0.8 V max) require a nominal 5-V supply. Using 3.3 V will result in undefined logic states, failed output drive, and potential damage due to improper biasing.
How does the SN74BCT652NT handle bus contention during mode switching?
The SN74BCT652NT eliminates decoding glitches during SAB/SBA transitions using dedicated synchronous select logic - ensuring no transient bus contention occurs when switching between real-time and stored data modes. This behavior is verified in the function table and timing diagrams of the official datasheet SCBS038A.
Is the SN74BCT652NT pin-compatible with other members of the '652 family?
Yes, the SN74BCT652NT shares identical pinout and functionality with SN74LS652N and SN74ACT652N in the 24-pin DIP (NT) package. However, electrical characteristics differ significantly - especially drive strength, speed, and power consumption - so electrical validation is required before substitution.
SN74BCT652NT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- 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:
- 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-PDIP
SN74BCT652NT FAQ
1.How can I place an order for SN74BCT652NT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT652NT 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 SN74BCT652NT reliable?
The price and inventory of SN74BCT652NT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT652NT is usually 5 days.
3.What payment methods are accepted for SN74BCT652NT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74BCT652NT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74BCT652NT?
SN74BCT652NT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT652NT 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 SN74BCT652NT?
For technical support, including SN74BCT652NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT652NT requirements.
6.How does Aetrix verify that SN74BCT652NT is sourced from the original manufacturer or authorized distributors?
All SN74BCT652NT 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 SN74BCT652NT meets industry standards.
7.What is the process for return or replacement of SN74BCT652NT?
All SN74BCT652NT units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT652NT, 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 SN74BCT652NT part is unused and in its original packaging.
Return procedure for SN74BCT652NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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