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Texas Instruments SN74LS652DW
- Part No.:
- SN74LS652DW
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LS652DW.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:121
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Product details
Overview
SN74LS652DW from Texas Instruments is an octal bus transceiver and register with 3-state outputs, designed for bidirectional data flow control in TTL-based systems. It features 8-bit parallel data paths, dual-function operation (transceiver + latch), independent output-enable (OE) and latch-enable (LE) controls, and operates over 0°C to 70°C. It is used in legacy industrial control backplanes and microprocessor system address/data bus isolation.
For engineers reviewing the SN74LS652DW datasheet, SN74LS652DW pinout, SN74LS652DW application, or SN74LS652DW equivalent, key selection criteria include its dual-mode (transmit/latch) functionality, TTL-compatible input thresholds, 3-state output drive capability, and SOIC-24 package compatibility with legacy board layouts.
Technical Context
The SN74LS652DW integrates two functional blocks per device: an octal transceiver path with directional control (DIR) and output enable (OE), plus an octal transparent latch with separate latch-enable (LE). Both sections share common data I/O pins (A0–A7 and B0–B7), enabling time-multiplexed bus usage.
It uses standard LS-TTL circuitry with Schottky-clamped bipolar transistors, delivering typical propagation delays of 15 ns (A→B) and 17 ns (B→A), and supports fan-out of 20 LS-TTL loads. Its 3-state outputs exhibit high-impedance off-state leakage ≤ 20 µA at VCC = 5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | LS-TTL - ensures compatibility with legacy 5-V TTL systems and predictable noise margins |
| Data Width | 8-bit bidirectional - supports full byte-wide data transfer between two buses |
| Operating Temperature | 0°C to 70°C - suitable for commercial-grade embedded control environments |
| Supply Voltage | VCC = 4.75 V to 5.25 V - tight tolerance aligns with regulated 5-V power rails |
| Propagation Delay | 15 ns (A→B), 17 ns (B→A) - enables synchronization in sub-20-ns timing-critical bus cycles |
| Output Drive | 3-state, ±8 mA - allows safe wired-OR bus sharing and hot-swap isolation |
| Input Threshold | VIL ≤ 0.8 V, VIH ≥ 2.0 V - matches standard TTL logic levels for reliable interfacing |
Pinout & Package
SN74LS652DW is housed in a 24-pin SOIC (DW) package with 300-mil body width, gull-wing leads, and RoHS-compliant NiPdAu plating. Pin pitch is 1.27 mm, and moisture sensitivity level is Level-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A7 | Bus A I/O terminals | Octal bidirectional data lines connected to local subsystem (e.g., CPU data bus) |
| B0–B7 | Bus B I/O terminals | Octal bidirectional data lines connected to remote subsystem (e.g., peripheral bus) |
| DIR | Direction control input | High = A→B transfer; Low = B→A transfer - defines real-time data flow direction |
| OE | Output enable input | Low = enables transceiver outputs; High = places all A/B pins in high-impedance state |
| LE | Latch enable input | High = transparent latch mode (data passes); Low = latches current A-side data on falling edge |
| GND | Ground reference | Signal and power return for LS-TTL logic; requires low-inductance PCB connection |
| VCC | Positive supply | +5 V DC supply; decoupling capacitor (0.1 µF) required per device per TI design guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Dual-function integration | Combines octal transceiver and octal latch in one SOIC-24 package - reduces board space and interconnect count vs. discrete solutions |
| Independent control inputs | Separate DIR, OE, and LE pins allow asynchronous coordination of data flow, bus release, and latching - essential for multi-cycle bus protocols |
| TTL-compatible 3-state outputs | Outputs meet LS-TTL VOH/VOL specs and support bus contention-free sharing across multiple drivers |
| Transparent latch operation | Latches data on Bus A when LE transitions from high to low - enables precise capture of transient bus states without external clocking |
| Commercial temperature range | Validated operation from 0°C to 70°C - certified for use in non-automotive, non-military industrial equipment |
Applications
| Microprocessor System Bus Isolation | Industrial PLC Backplane Interface |
|---|---|
Use Scenario: Isolating CPU data/address bus from peripheral expansion slots during DMA or interrupt handling. IC Role / Device Role / Timing Role: SN74LS652DW acts as a controlled bidirectional buffer with latch capability to hold address values while data transfers occur. Use Value: Eliminates need for separate transceivers and latches, reducing component count and timing skew in 8080/Z80-era designs. | Use Scenario: Interfacing modular I/O cards to a central controller bus in programmable logic controllers. IC Role / Device Role / Timing Role: SN74LS652DW serves as a configurable bus repeater and data snapshot unit for deterministic scan-cycle data capture. Use Value: Enables synchronized read/write handshaking using DIR and OE, with LE capturing status before bus release. |
| Legacy Test Equipment Data Path | Embedded Instrumentation Signal Routing |
Use Scenario: Routing measurement data between ADC/DAC modules and display/control processors in benchtop instruments. IC Role / Device Role / Timing Role: SN74LS652DW functions as a reconfigurable data highway with latch-on-demand for stable waveform display buffering. Use Value: Provides deterministic 8-bit data capture without external clock domain crossing logic. | Use Scenario: Managing shared sensor data bus among multiple microcontrollers in distributed monitoring nodes. IC Role / Device Role / Timing Role: SN74LS652DW operates as a managed bus arbitrator, using OE to isolate inactive nodes and LE to freeze diagnostic snapshots. Use Value: Supports fault-tolerant bus operation with hardware-level isolation and state retention. |
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 |
|---|---|---|---|
| SN74LS245N | Octal transceiver only - no latch function; DIP-20 package; lacks LE input and A/B latch capability | Suitable only for pure bidirectional data transfer; cannot replace SN74LS652DW where latching is required | Select SN74LS245N only if latch functionality is omitted from system architecture |
| SN74LS373N | Octal transparent latch only - no transceiver path or DIR/OE-controlled bidirectional I/O | Applicable only for unidirectional data latching; requires external transceivers for bus arbitration | Choose SN74LS373N when bus direction is fixed and latching is the sole requirement |
Compared with SN74LS245N and SN74LS373N, the SN74LS652DW uniquely combines both transceiver and latch functions in one device, eliminating inter-device timing skew and reducing PCB routing complexity in systems requiring coordinated data movement and state capture.
Availability
SN74LS652DW is available at Aetrix Electronics and suitable for industrial control backplanes, legacy test equipment refurbishment, and embedded instrumentation requiring stable component supply and long-term obsolescence management.
Supply support for SN74LS652DW 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 company founded in 1930, specializing in analog, embedded processing, and logic ICs with broad industrial and automotive portfolio coverage.
The SN74LS652DW belongs to TI's legacy 74LS logic family, engineered for reliability and interoperability in commercial-grade digital systems requiring robust TTL-level signal integrity and deterministic timing behavior.
FAQ
What is the primary function of the SN74LS652DW?
The SN74LS652DW is an octal bus transceiver and register that provides bidirectional 8-bit data transfer with integrated transparent latching. Its dual functionality allows it to serve as both a directional data buffer and a data capture latch within a single SOIC-24 package, supporting legacy TTL system architectures where space and timing determinism are critical.
Does the SN74LS652DW support 3-state outputs?
Yes, the SN74LS652DW features fully 3-state outputs controlled by the OE (output enable) input. When OE is high, all A0–A7 and B0–B7 pins enter high-impedance mode, allowing safe bus sharing without contention. This behavior is specified in the TI SDLS191A datasheet and verified across commercial temperature range (0°C to 70°C).
What is the role of the LE (latch-enable) pin on the SN74LS652DW?
The LE pin on the SN74LS652DW controls the transparent latch section: when LE is high, data passes through from Bus A to internal latch; when LE transitions from high to low, the current Bus A data is captured and held. This enables precise, edge-triggered snapshotting of bus states without requiring an external clock signal - a key capability distinguishing SN74LS652DW from basic transceivers.
Can the SN74LS652DW be used in place of the SN74LS245?
No - the SN74LS652DW cannot directly replace the SN74LS245 because it includes additional latch functionality and different pinout (SOIC-24 vs. DIP-20). While both provide octal bidirectional transfer, SN74LS652DW requires LE and DIR control signals not present in SN74LS245 designs. Substitution would require PCB layout and firmware changes.
What package type does the SN74LS652DW use?
The SN74LS652DW uses a 24-pin SOIC (DW) package with 300-mil width, 1.27-mm lead pitch, and NiPdAu lead finish. It is RoHS-compliant, rated MSL Level-1, and intended for surface-mount assembly with peak reflow up to 260°C. The part marking "LS652" appears on the top surface per TI packaging documentation.
SN74LS652DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN74LS652DW FAQ
1.How can I place an order for SN74LS652DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS652DW 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 SN74LS652DW reliable?
The price and inventory of SN74LS652DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS652DW is usually 5 days.
3.What payment methods are accepted for SN74LS652DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS652DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS652DW?
SN74LS652DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS652DW 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 SN74LS652DW?
For technical support, including SN74LS652DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS652DW requirements.
6.How does Aetrix verify that SN74LS652DW is sourced from the original manufacturer or authorized distributors?
All SN74LS652DW 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 SN74LS652DW meets industry standards.
7.What is the process for return or replacement of SN74LS652DW?
All SN74LS652DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS652DW, 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 SN74LS652DW part is unused and in its original packaging.
Return procedure for SN74LS652DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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