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Texas Instruments SN74LS652DWR
- Part No.:
- SN74LS652DWR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LS652DWR.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,281
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Product details
Overview
SN74LS652DWR from Texas Instruments is an octal bus transceiver and register IC with 3-state outputs, designed for bidirectional data flow control in TTL-based 8-bit parallel bus systems. 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 fan-out of 20 TTL loads.
For engineers reviewing the SN74LS652DWR datasheet, SN74LS652DWR pinout, SN74LS652DWR application, or SN74LS652DWR equivalent, key selection considerations include its dual-function capability (transceiver + transparent latch), independent bus direction control, 24-pin SOIC package compatibility, and legacy TTL logic level interface requirements in industrial control and retro-computing systems.
Technical Context
The SN74LS652DWR integrates eight non-inverting bidirectional buffers with latching capability on both A and B buses. Its internal architecture supports simultaneous data latching and bus isolation via separate LE\ and OE\ signals, enabling synchronous data capture and controlled output drive without bus contention.
It operates strictly within the 5-V ±5% TTL supply range, exhibits guaranteed high-impedance output states when OE\ is high, and maintains compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and output drive levels (VOH = 2.7 V min at IOH = –400 µA, VOL = 0.5 V max at IOL = 8 mA) per standard LS-TTL specifications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 5 V ±5% - required for correct TTL logic threshold compliance and output drive strength |
| Propagation Delay | 22 ns max (A→B or B→A) - determines maximum synchronous bus clock rate in latch-enabled mode |
| Fan-out | 20 TTL loads - supports direct connection to multiple downstream LS-TTL inputs without buffering |
| Output Drive | 8 mA sink / 400 µA source - sufficient to drive standard TTL inputs and small capacitive loads (≤15 pF) |
| Operating Temp | 0°C to +70°C - suitable for commercial-grade embedded systems, not extended or military temperature ranges |
| Logic Family | LS-TTL - ensures voltage-level and timing compatibility with SN74LSxx series components |
Pinout & Package
SN74LS652DWR is housed in a 24-pin SOIC (DW) package with standard 0.300-inch body width, gull-wing leads, and RoHS-compliant NiPdAu (NIPDAU) finish. The package is moisture-sensitive Level-1 (unlimited floor life at ≤30°C/60% RH) and rated for peak reflow at 260°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | A-side data inputs/outputs | Bidirectional port connected to local subsystem (e.g., CPU data bus); driven or read based on OE\ and direction control |
| B1–B8 | B-side data inputs/outputs | Bidirectional port connected to external bus (e.g., memory or peripheral bus); direction determined by LE\ and OE\ state |
| OE\ | Output enable (active low) | When high, places all A- and B-port outputs in high-impedance state; essential for bus arbitration |
| LE\ | Latch enable (active low) | When pulsed low, captures and holds current A- and B-port data; enables transparent latch functionality |
| GND | Ground reference | Signal and power return path; must be low-inductance connection to minimize switching noise |
| VCC | Positive supply | 5-V TTL supply; requires local 0.1-µF ceramic decoupling capacitor adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual-function operation | Simultaneous transceiver and transparent latch behavior eliminates need for separate buffer + latch ICs in bus interface designs |
| Independent bus control | Separate LE\ and OE\ pins allow precise timing coordination between data capture and bus release, preventing glitches during handshaking |
| 3-state outputs | Full high-impedance isolation on both A and B ports when OE\ is asserted, enabling safe multi-drop bus sharing |
| TTL-compatible I/O | Guaranteed VIH/VIL and VOH/VOL margins ensure interoperability with legacy SN74LSxx, SN74Sxx, and 74xx families without level-shifting |
Applications
| Industrial PLC Backplane Interface | Retrocomputing Bus Expansion |
|---|---|
Use Scenario: Interfacing microprocessor local bus to modular I/O backplane in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional data transceiver with latch synchronization for cycle-stable communication between CPU and distributed I/O modules. Use Value: Eliminates timing skew between address/data setup and strobe assertion using LE\-controlled latching, ensuring reliable 8-bit parallel transfers at ≤20 MHz effective rate. | Use Scenario: Extending data/address bus in 1980s-era 8-bit computer clones (e.g., Z80 or 6502-based systems). IC Role / Device Role / Timing Role: Registered bus driver providing clean, latched signal routing between CPU, RAM, and expansion slots. Use Value: Matches original system timing budgets with 22-ns propagation and TTL-compatible thresholds, preserving compatibility with vintage peripheral timing constraints. |
| Legacy Test Equipment Data Path | Embedded Instrumentation Subsystem |
Use Scenario: Isolating and synchronizing digital stimulus/response paths in automated test equipment mainframes. IC Role / Device Role / Timing Role: Controlled-direction bus transceiver enabling repeatable data capture from DUT while preventing backdrive into controller logic. Use Value: High-impedance isolation via OE\ allows safe hot-swap of test modules without disrupting master controller operation. | Use Scenario: Managing shared sensor data bus among multiple ADCs and microcontrollers in fixed-function instrumentation. IC Role / Device Role / Timing Role: Latched bus interface coordinating time-critical analog-to-digital sample transfer across isolated subsystems. Use Value: LE\-triggered capture ensures atomic sampling window alignment across distributed sensors, reducing jitter-induced measurement error. |
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 |
|---|---|---|---|
| SN74LS651DWR | Lacks latch-enable (LE\) function; only transceiver mode with direction control via DIR pin | Suitable for simpler unidirectional or direction-switched bus interfaces without data hold requirement | Select when latch functionality is unnecessary and board layout favors single-direction control logic |
| SN74LS653DWR | Includes DIR pin instead of LE\; provides true directional control (A→B or B→A) but no transparent latching | Better suited for point-to-point bus extension where data flow direction changes infrequently | Choose when deterministic bus direction is prioritized over synchronized data capture across both ports |
Compared with SN74LS651DWR and SN74LS653DWR, the SN74LS652DWR uniquely combines bidirectional transceivers with independent latch-enable capability-enabling simultaneous data capture and bus isolation critical for handshake-driven or multi-master bus architectures.
Availability
SN74LS652DWR is available at Aetrix Electronics and suitable for industrial PLC backplanes, retrocomputing bus expansion, and legacy test equipment data paths requiring stable component supply and long-term obsolescence management.
Supply support for SN74LS652DWR 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 founded in 1930, specializing in analog, embedded processing, and logic technologies with broad industrial, automotive, and communications applications.
The SN74LS652DWR belongs to TI's legacy TTL logic portfolio, engineered specifically for robust, pin-compatible replacement in 8-bit parallel bus systems where timing predictability, bus contention avoidance, and backward compatibility with 1970s–1980s digital architectures are essential.
FAQ
What is the primary function of the SN74LS652DWR in a digital system?
The SN74LS652DWR serves as an octal bidirectional bus transceiver with integrated transparent latch functionality. It enables controlled data exchange between two 8-bit buses (A and B) while allowing synchronous capture of bus values via its LE\ input. This dual capability makes SN74LS652DWR especially valuable in systems requiring both real-time bus driving and glitch-free data sampling, such as industrial backplanes and vintage computer expansions.
Does the SN74LS652DWR support 3.3-V operation?
No, the SN74LS652DWR is strictly a 5-V TTL device and does not support 3.3-V operation. Its input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and output drive characteristics (VOH ≥ 2.7 V at –400 µA) are specified only for VCC = 5 V ±5%. Using SN74LS652DWR with 3.3-V logic may result in unreliable switching, excessive current draw, or damage due to input overvoltage conditions.
How does the LE\ pin differ from OE\ on the SN74LS652DWR?
The LE\ (Latch Enable) pin controls data capture: when pulsed low, it transparently latches current values on both A and B ports. The OE\ (Output Enable) pin controls output state: when high, it forces all A- and B-port outputs into high-impedance mode regardless of LE\ state. In SN74LS652DWR, these functions operate independently-allowing latched data retention while outputs remain isolated-a key distinction from simpler transceivers like SN74LS651DWR.
Is the SN74LS652DWR pin-compatible with other members of the SN74LS65x family?
SN74LS652DWR shares the same 24-pin SOIC (DW) package and pinout with SN74LS651DWR and SN74LS653DWR per TI's SDLS191A datasheet. However, functional pin assignments differ: SN74LS652DWR uses pins 1 and 2 for LE\ and OE\, whereas SN74LS651DWR uses pin 1 for DIR and SN74LS653DWR repurposes pin 2. Thus, SN74LS652DWR is not a drop-in replacement without logic redesign.
What thermal and packaging specifications apply to the SN74LS652DWR?
The SN74LS652DWR is packaged in a 24-pin SOIC (DW) with NiPdAu (NIPDAU) lead finish, rated for moisture sensitivity Level-1 (unlimited floor life at ≤30°C/60% RH), and qualified for peak reflow soldering at 260°C. Its commercial temperature range is 0°C to +70°C, and it requires standard 5-V decoupling (0.1 µF ceramic near VCC) to maintain stable operation under dynamic bus loading.
SN74LS652DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN74LS652DWR FAQ
1.How can I place an order for SN74LS652DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS652DWR 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 SN74LS652DWR reliable?
The price and inventory of SN74LS652DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS652DWR is usually 5 days.
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SN74LS652DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS652DWR 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 SN74LS652DWR?
For technical support, including SN74LS652DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS652DWR requirements.
6.How does Aetrix verify that SN74LS652DWR is sourced from the original manufacturer or authorized distributors?
All SN74LS652DWR 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 SN74LS652DWR meets industry standards.
7.What is the process for return or replacement of SN74LS652DWR?
All SN74LS652DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS652DWR, 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 SN74LS652DWR part is unused and in its original packaging.
Return procedure for SN74LS652DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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