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Texas Instruments SN74LS368ANE4
- Part No.:
- SN74LS368ANE4
- Manufacturer:
- Texas Instruments
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74LS368ANE4.pdf
- Description:
- BUS DRIVER, LS SERIES, 2-FUNC, 4
- Quantity:
- Payment:
- Shipping:
Inventory:875
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Product details
Overview
SN74LS368ANE4 from Texas Instruments is a dual 4-bit inverting bus transceiver with three-state outputs, designed for bidirectional data flow control in TTL-level digital systems. It features 16-pin PDIP packaging, operates from 0°C to 70°C, supports ±24mA output drive, and implements active-low output-enable (OE) control per side. It is used in legacy industrial control backplanes and microprocessor address/data bus isolation.
For engineers reviewing the SN74LS368ANE4 datasheet, SN74LS368ANE4 pinout, SN74LS368ANE4 application, or SN74LS368ANE4 equivalent, key selection considerations include its non-inverting A→B and inverting B→A data paths, guaranteed 35ns maximum propagation delay at VCC = 5V, and compatibility with standard LS-TTL logic families in mixed-signal board designs.
Technical Context
The SN74LS368ANE4 integrates two independent 4-bit transceiver sections - each with separate A- and B-side I/Os and dedicated active-low OE inputs - enabling simultaneous or selective bidirectional data transfer. Its internal architecture uses standard bipolar TTL circuitry with Schottky-clamped transistors to ensure noise immunity and predictable switching thresholds.
Each transceiver section provides true (A→B) and complemented (B→A) outputs, allowing flexible bus arbitration and signal inversion without external logic. Output enable timing is synchronized to input transitions, with guaranteed setup/hold margins relative to OE assertion for glitch-free state transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | LS-TTL - ensures interoperability with 74LS-series components and defined VIH/VIL thresholds (2.0V/0.8V). |
| Propagation Delay | 35 ns max (A→B or B→A) at VCC = 5V - determines maximum clock rate in synchronous bus interfaces. |
| Output Drive | ±24 mA (IOH/IOL) - supports direct driving of multiple LS loads (fan-out ≥20) without buffers. |
| Operating Temperature | 0°C to +70°C - validated for commercial-grade embedded control and instrumentation applications. |
| Supply Voltage | 4.75V to 5.25V - tight regulation required to maintain timing specs and noise margin compliance. |
| Three-State Enable | Active-low OE per section - allows independent bus contention management for A and B ports. |
Pinout & Package
SN74LS368ANE4 is housed in a 16-pin plastic dual in-line package (PDIP-N), 0.300" wide, with standard through-hole mounting and JEDEC MO-015AC outline. Pin 1 is marked by a notch or dot; pin numbering follows counterclockwise convention from top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | OE (Active-Low) | Output-enable control for respective 4-bit transceiver section; low = enabled, high = high-impedance. |
| 2–5, 10–13 | A1–A4 / B1–B4 | Bidirectional data I/O pairs; A→B path is non-inverting, B→A path is inverting. |
| 6, 7, 14, 16 | GND / VCC | Ground (pins 6, 14) and +5V supply (pins 7, 16); dual power/ground pins reduce switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent transceivers | Enables isolated control of two 4-bit buses (e.g., CPU address vs. peripheral data) with separate OE signals. |
| True + Complemented outputs | Eliminates need for external inverters when bidirectional inverted signaling is required (e.g., differential bus termination). |
| High-output current drive | ±24 mA capability allows direct interface to multiple LS-TTL inputs or LED indicators without pull-up resistors. |
| Guaranteed 35 ns propagation | Supports reliable operation up to ~14 MHz in synchronous bus cycles with adequate setup/hold margins. |
Applications
| Industrial Backplane Interface | Legacy Microprocessor Bus Isolation |
|---|---|
Use Scenario: Isolating address/data lines between a main controller and modular I/O cards in a DIN-rail mounted PLC chassis. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing multiplexed 8-bit address and 8-bit data lanes with direction control via system FPGA. Use Value: Prevents bus contention during hot-swap events and enables voltage-level translation between mismatched subsystems using only passive pull-ups. | Use Scenario: Interfacing Z80 or 8085 CPU with memory-mapped peripherals where address latching and data buffering are required. IC Role / Device Role / Timing Role: Provides direction-controlled data path between CPU AD0–AD7 and peripheral registers while maintaining LS-TTL timing integrity. Use Value: Eliminates need for discrete 74LS244/245 combinations, reducing component count and PCB area in space-constrained SBC designs. |
| Test Equipment Signal Routing | Automated Test Fixture Control |
Use Scenario: Configurable signal routing matrix in benchtop logic analyzers or boundary-scan test adapters. IC Role / Device Role / Timing Role: Reconfigurable bidirectional channel for injecting or capturing test vectors on DUT pins under software control. Use Value: Enables dynamic reassignment of probe channels without hardware changes, improving test coverage and reducing fixture complexity. | Use Scenario: Controlling relay banks and reading sensor status in automated functional test fixtures for PCB assembly verification. IC Role / Device Role / Timing Role: Transceiver handling parallel control word writes and status readbacks over shared 8-bit control bus. Use Value: Allows single microcontroller port to manage >16 relays and sensors using time-multiplexed bidirectional communication. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS245N | Octal (8-bit) non-inverting transceiver; single OE; no complemented outputs. | Suitable for unidirectional or simple bidirectional data movement without inversion requirement. | Select when full 8-bit width and simplified control (one OE) outweigh need for per-section enable or B→A inversion. |
| SN74LS367AN | Hex non-inverting buffer with three-state outputs; no B-side I/O or bidirectional capability. | Used for unidirectional bus driving or address latching where direction reversal is handled externally. | Choose when only A→B signal conditioning is needed and space permits separate drivers for reverse path. |
Compared with SN74LS245N and SN74LS367AN, the SN74LS368ANE4 uniquely delivers dual 4-bit bidirectional paths with built-in inversion on one direction - making it irreplaceable in designs requiring compact, self-contained bus arbitration with mixed logic polarity.
Availability
SN74LS368ANE4 is available at Aetrix Electronics and suitable for industrial control backplanes, legacy microprocessor bus isolation, and automated test fixture control requiring stable component supply across long-lifecycle programs.
Supply support for SN74LS368ANE4 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 90 years of innovation in industrial, automotive, and communications markets.
The SN74LS368ANE4 belongs to TI's legacy 74LS logic family, engineered for robustness and compatibility in mission-critical commercial and industrial systems where reliability and long-term availability are essential.
FAQ
What is the function of pin 1 and pin 15 on the SN74LS368ANE4?
Pin 1 and pin 15 are independent active-low output-enable (OE) inputs controlling the left and right 4-bit transceiver sections respectively. When low, each enables bidirectional data flow on its associated A/B port pair; when high, it places that section's outputs in high-impedance state. This allows selective bus arbitration without affecting the other section - a key feature leveraged in the SN74LS368ANE4 for modular system design.
Does the SN74LS368ANE4 support hot-swapping in live backplane systems?
The SN74LS368ANE4 is not hot-swap rated and lacks built-in bus-fault protection or power-up sequencing logic. While its three-state outputs help prevent contention during insertion, safe hot-swap operation requires external current-limiting resistors, slew-rate controlled OE control, and system-level power sequencing - capabilities not inherent to the SN74LS368ANE4 itself.
Can the SN74LS368ANE4 be used with 3.3V logic systems?
No - the SN74LS368ANE4 is strictly a 5V-only device with TTL input thresholds (VIH = 2.0V min, VIL = 0.8V max) and 4.75–5.25V supply requirement. Direct connection to 3.3V logic risks undriven inputs, marginal noise margins, and potential damage due to input clamp diode conduction; level-shifting circuitry is mandatory for interoperability with SN74LS368ANE4.
How does the SN74LS368ANE4 differ from the SN74LS245 in terms of signal inversion?
Unlike the SN74LS245 - which provides identical (non-inverting) data transfer in both directions - the SN74LS368ANE4 implements true (A→B) and complemented (B→A) outputs per section. This means data written to B-side appears inverted when read back from A-side, a feature absent in SN74LS245 and critical for certain parity generation or differential signaling schemes within the SN74LS368ANE4's target applications.
Is the SN74LS368ANE4 RoHS compliant?
Yes - the SN74LS368ANE4 uses NiPdAu (NIPDAU) lead finish and is RoHS compliant per TI's packaging documentation. The "E4" suffix specifically denotes this RoHS-compliant PDIP variant, distinguishing it from legacy SNPB (lead-based) versions used in military-grade derivatives like SNJ54LS368AJ.
SN74LS368ANE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 2, 4 (Hex)
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 2.6mA, 24mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
SN74LS368ANE4 FAQ
1.How can I place an order for SN74LS368ANE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS368ANE4 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 SN74LS368ANE4 reliable?
The price and inventory of SN74LS368ANE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS368ANE4 is usually 5 days.
3.What payment methods are accepted for SN74LS368ANE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS368ANE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS368ANE4?
SN74LS368ANE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS368ANE4 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 SN74LS368ANE4?
For technical support, including SN74LS368ANE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS368ANE4 requirements.
6.How does Aetrix verify that SN74LS368ANE4 is sourced from the original manufacturer or authorized distributors?
All SN74LS368ANE4 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 SN74LS368ANE4 meets industry standards.
7.What is the process for return or replacement of SN74LS368ANE4?
All SN74LS368ANE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS368ANE4, 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 SN74LS368ANE4 part is unused and in its original packaging.
Return procedure for SN74LS368ANE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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