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Texas Instruments SN74LS652NT
- Part No.:
- SN74LS652NT
- Manufacturer:
- Texas Instruments
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74LS652NT.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,910
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Product details
Overview
SN74LS652NT from Texas Instruments is an octal bus transceiver and register with 3-state outputs, designed for bidirectional data flow control in TTL-based 8-bit parallel buses. It features separate A- and B-bus ports, active-low output-enable (OE\), and latch-enable (LE\) controls, operating at VCC = 5 V with typical propagation delay of 22 ns and fanout of 20 TTL loads.
For engineers reviewing the SN74LS652NT datasheet, SN74LS652NT pinout, SN74LS652NT application, or SN74LS652NT equivalent, key selection considerations include its dual-function capability (transceiver + transparent latch), non-inverting data path, TTL-compatible input thresholds, and SOIC-24 package compatibility with legacy industrial control and data acquisition systems.
Technical Context
The SN74LS652NT integrates eight independent bidirectional bus transceivers with internal latching logic, enabling simultaneous data transfer and storage on a single 24-pin SOIC device. Its LE\ input controls transparent latching of A-to-B or B-to-A data, while OE\ independently enables/disables both direction outputs.
This device operates strictly within the 74LS TTL family electrical and timing specifications: VIH = 2.0 V min, VIL = 0.8 V max, IOH = –15 mA, IOL = 24 mA, and supports wired-AND bus arbitration via 3-state outputs with defined high-impedance leakage limits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74LS TTL - ensures interoperability with legacy LS-series logic without level-shifting. |
| Bus Width | Octal (8-bit) - supports full byte-wide data paths in microprocessor address/data buses. |
| Propagation Delay | 22 ns max (A→B or B→A) - enables reliable operation up to ~20 MHz bus toggle rates. |
| Output Drive | IOL = 24 mA / IOH = –15 mA - sufficient to drive 20 standard TTL inputs directly. |
| Supply Voltage | VCC = 4.75 V to 5.25 V - compatible with regulated 5-V power rails in industrial backplanes. |
| Operating Temp | 0 °C to +70 °C - rated for commercial-grade embedded systems and test equipment. |
Pinout & Package
SN74LS652NT is housed in a 24-pin small-outline integrated circuit (SOIC) package with standard 0.300-inch body width and 1.27-mm lead pitch, suitable for surface-mount assembly and reflow soldering per JEDEC Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | Input/Output port A | 8-bit bidirectional data terminal connected to local subsystem (e.g., CPU data bus). |
| B1–B8 | Input/Output port B | 8-bit bidirectional data terminal connected to peripheral or memory bus segment. |
| OE\ | Active-low output enable | Disables all A/B outputs into high-impedance state when high; enables bidirectional flow when low. |
| LE\ | Active-low latch enable | When low, transparently passes data between A and B; when high, latches last valid data. |
| GND | Ground reference | Common return path for all logic and output currents; requires low-inductance PCB connection. |
| VCC | Positive supply | 5-V DC power input; must be decoupled locally with 0.1-µF ceramic capacitor near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode operation | Functions as either octal transceiver or octal transparent latch depending on LE\ state. |
| Independent output control | OE\ disables outputs without affecting internal latch state or input sampling. |
| TTL-compatible thresholds | VIH = 2.0 V min / VIL = 0.8 V max ensures robust noise margin in mixed-logic systems. |
| High sink current | 24-mA output drive supports direct interfacing to multiple TTL loads or LED indicators. |
Applications
| Industrial PLC Backplane Interface | Data Acquisition System Bus Isolation |
|---|---|
Use Scenario: Connecting microcontroller data bus to modular I/O expansion slots in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional bus transceiver providing controlled data exchange between CPU and field modules while preventing bus contention. Use Value: Enables hot-swap-capable slot architecture using OE\ to isolate faulty modules without resetting the entire system. | Use Scenario: Isolating analog-to-digital converter (ADC) output bus from main controller during conversion cycles. IC Role / Device Role / Timing Role: Octal latch holding stable digital sample values until controller reads them, eliminating metastability risks. Use Value: LE\ synchronizes latch capture with ADC EOC signal, ensuring glitch-free sampled data transfer at up to 1 MHz burst rates. |
| Legacy Computer Memory Expansion | Test Equipment Signal Routing Matrix |
Use Scenario: Adding external RAM or ROM to 8-bit microcomputer systems like Z80 or 8085-based designs. IC Role / Device Role / Timing Role: Address/data bus transceiver buffering memory access signals between CPU and external memory banks. Use Value: Propagation delay under 22 ns meets strict 4-MHz Z80 wait-state timing requirements without added clock stretching. | Use Scenario: Configurable signal routing between multiple DUT interfaces and measurement instruments in automated test fixtures. IC Role / Device Role / Timing Role: Reconfigurable bus switch enabling dynamic assignment of shared test resources across up to eight DUT channels. Use Value: OE\ and LE\ allow real-time reconfiguration of signal paths without power cycling, reducing fixture setup time by >60%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver and latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS245N | Octal transceiver only - no latch function; lacks LE\ input and internal storage capability. | Suitable for pure bidirectional data transfer but cannot hold data during bus arbitration or asynchronous events. | Select SN74LS245N when latch functionality is unnecessary and board space allows separate latch ICs. |
| SN74LS373N | Octal transparent latch only - no bidirectional ports; A/B bus structure replaced by single 8-bit input/output with G\ and OE\. | Used for unidirectional data latching (e.g., address latching), not for bus bridging or dynamic direction control. | Choose SN74LS373N where data flow is strictly one-way and timing-critical address capture is required. |
Compared with SN74LS245N and SN74LS373N, the SN74LS652NT uniquely combines bidirectional bus transceivers and transparent latching in one SOIC-24 package, eliminating interconnect delays and PCB routing complexity in systems requiring both functions.
Availability
SN74LS652NT is available at Aetrix Electronics and suitable for industrial PLC backplanes, data acquisition systems, legacy computer memory expansion, and automated test equipment requiring stable component supply and long-term obsolescence management.
Supply support for SN74LS652NT 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 company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74LS652NT belongs to TI's legacy 74LS logic family, engineered for reliability and interoperability in fixed-function digital systems where predictable timing, noise immunity, and drop-in replacement of aging components are critical.
FAQ
What is the primary function of the SN74LS652NT?
The SN74LS652NT is an octal bus transceiver and register that provides bidirectional data transfer between two 8-bit buses while supporting transparent latching. Its dual functionality allows it to serve as both a bus interface and a data-holding element in systems such as industrial controllers and data acquisition hardware, making the SN74LS652NT especially valuable where space and signal integrity constraints limit discrete component count.
Does the SN74LS652NT support 3.3-V operation?
No, the SN74LS652NT is a 74LS-family TTL device specified only for 5-V operation (4.75 V to 5.25 V). It is not 3.3-V tolerant, and applying 3.3-V logic levels to its inputs may result in marginal or non-compliant switching behavior. For mixed-voltage systems, level-shifting circuitry or a 3.3-V-compatible alternative must be used alongside the SN74LS652NT.
How does the LE\ pin affect data flow in the SN74LS652NT?
When LE\ is low, the SN74LS652NT operates as a transparent octal bus transceiver, passing data bidirectionally between A and B ports in real time. When LE\ is high, it latches and holds the last valid data present on the B port, freezing the output state regardless of subsequent A-port changes - a behavior essential for synchronized sampling in test and measurement applications using the SN74LS652NT.
Is the SN74LS652NT pin-compatible with other 74LS-series octal devices?
The SN74LS652NT uses a unique 24-pin SOIC footprint optimized for its dual A/B bus and dual-control (OE\, LE\) architecture. It is not pin-compatible with SN74LS245N (20-pin) or SN74LS373N (20-pin); layout adaptation is required. However, its pinout follows TI's standard SOIC-24 mechanical dimensions, allowing direct substitution within the SN74LS651/SN74LS652/SN74LS653 family.
What thermal and packaging specifications apply to the SN74LS652NT?
The SN74LS652NT is offered in a SOIC-24 package (DW suffix) rated for 0 °C to +70 °C operation, with NIPDAU lead finish and JEDEC Level-1 moisture sensitivity. Its thermal resistance (θJA) is 100 °C/W typical, and it requires standard 5-V decoupling per TI guidelines. The SN74LS652NT marking "LS652" appears on the top surface, consistent with TI's legacy logic identification scheme.
SN74LS652NT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- 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, 24mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-PDIP
SN74LS652NT FAQ
1.How can I place an order for SN74LS652NT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS652NT 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 SN74LS652NT reliable?
The price and inventory of SN74LS652NT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS652NT is usually 5 days.
3.What payment methods are accepted for SN74LS652NT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS652NT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS652NT?
SN74LS652NT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS652NT 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 SN74LS652NT?
For technical support, including SN74LS652NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS652NT requirements.
6.How does Aetrix verify that SN74LS652NT is sourced from the original manufacturer or authorized distributors?
All SN74LS652NT 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 SN74LS652NT meets industry standards.
7.What is the process for return or replacement of SN74LS652NT?
All SN74LS652NT units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS652NT, 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 SN74LS652NT part is unused and in its original packaging.
Return procedure for SN74LS652NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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