My Inquiry
My Account
Texas Instruments SN74LS368ANSR
- Part No.:
- SN74LS368ANSR
- Manufacturer:
- Texas Instruments
- Package:
- 16-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LS368ANSR.pdf
- Description:
- IC BUFFER INVERT 5.25V 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,888
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74LS368ANSR from Texas Instruments is a dual 4-bit inverting line driver/receiver IC in SOP-16 package, operating from 4.75 V to 5.25 V with typical propagation delay of 15 ns and output drive capability of ±8 mA. It functions as a bidirectional bus interface with three-state outputs, commonly used in industrial control backplanes and legacy TTL system data buffering.
For engineers reviewing the SN74LS368ANSR datasheet, SN74LS368ANSR pinout, SN74LS368ANSR application, or SN74LS368ANSR equivalent, key selection criteria include its 16-pin SOP (NS) package, guaranteed -40°C to +85°C industrial temperature range, three-state enable logic (active-low OE), and compatibility with standard LS-TTL input thresholds and output drive levels.
Technical Context
The SN74LS368ANSR implements two independent 4-bit channels, each with four inverting buffers and individual active-low output-enable (OE) controls. Each channel supports bidirectional data flow when paired with complementary devices like SN74LS367A, enabling half-duplex bus arbitration in legacy parallel interfaces.
Its internal architecture uses standard bipolar TTL circuitry with Schottky-clamped transistors to limit saturation and reduce propagation delay. Input hysteresis is not present; inputs conform strictly to LS-TTL voltage thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), and outputs meet LS-TTL VOH/VOL specs under specified load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75 V to 5.25 V - Ensures compatibility with standard 5 V TTL power rails and noise margin compliance. |
| Propagation Delay | 15 ns max (tPLH/tPHL) - Enables reliable operation in 33 MHz synchronous bus systems with setup/hold timing budgets. |
| Output Drive | ±8 mA (IOH/IOL) - Sufficient to drive 10 LS-TTL loads or terminate short stubs on unterminated buses. |
| Input Thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V - Matches standard LS-TTL logic families for seamless interconnection without level shifting. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial and industrial embedded applications where ambient does not exceed 70°C. |
| Package | SOP (NS)-16 - Surface-mount 16-pin small-outline package with 1.27 mm pitch, compatible with standard reflow profiles (Level-1). |
Pinout & Package
SOP (NS)-16 package: 16-pin surface-mount small-outline package, 10.4 mm × 5.3 mm body, 1.27 mm lead pitch, maximum height 2.00 mm, pin 1 marked by beveled corner and notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | Active-low Output Enable (OE) | Controls three-state output of respective 4-bit channel; low enables outputs, high disables (high-Z). |
| 2–5, 10–13 | Data Inputs (A1–A4, B1–B4) | Inverting inputs: logic high at input produces logic low at corresponding output. |
| 6–9, 14, 16 | Data Outputs (Y1–Y4, Y5–Y8) | Inverting outputs: driven low when OE active and input high; high-Z when OE inactive. |
| 8 | GND | Ground reference for all internal circuitry and I/O pins. |
| 16 | VCC | +5 V supply pin; decoupling capacitor required within 1 cm for stable switching performance. |
Key Features
| Feature | Design Value |
|---|---|
| Three-state outputs | Independent OE control per 4-bit channel enables time-multiplexed bus sharing without external logic. |
| Inverting logic function | Provides signal polarity inversion essential for differential bus drivers and complemented control paths. |
| LS-TTL compatible I/O | Meets TI's LS family DC and AC specifications, ensuring drop-in replacement in existing LS-based designs. |
| Low-power Schottky technology | Reduces propagation delay vs. standard TTL while maintaining comparable power consumption (~19 mW per channel). |
| RoHS-compliant packaging | NIPDAU lead finish and SOP-16 package support lead-free assembly per IPC-J-STD-020. |
Applications
| Industrial Backplane Interface | Legacy Test Equipment Bus |
|---|---|
Use Scenario: Interfacing microcontroller GPIO banks to isolated 16-bit parallel I/O modules across long PCB traces in programmable logic controllers. IC Role / Device Role / Timing Role: Inverting line driver/receiver providing level-shifted, buffered, and three-state-controlled signals between CPU and peripheral cards. Use Value: Enables deterministic bus arbitration via OE control, reduces signal reflections with matched output impedance, and maintains LS-TTL noise margins over 15 cm trace lengths. | Use Scenario: Bidirectional data transfer between pattern generator ASIC and DUT interface board in automated test systems using IEEE-488-compatible parallel handshaking. IC Role / Device Role / Timing Role: Dual-channel inverting buffer with independent OE allows synchronized read/write direction switching on shared 8-bit data lines. Use Value: Eliminates need for discrete inverters and tristate logic gates, reducing component count and layout area while preserving timing integrity at 10 MHz burst rates. |
| Embedded System Expansion Port | Legacy Instrumentation Data Link |
Use Scenario: Extending address/data bus from an 8051-based controller to external EPROM and latch peripherals in medical diagnostic hardware. IC Role / Device Role / Timing Role: Inverting receiver driving local bus segments with controlled slew rate and three-state isolation during memory access cycles. Use Value: Prevents bus contention during instruction fetch and data write phases, supports clean signal edges up to 20 MHz clock domains. | Use Scenario: Isolating and conditioning digital control signals between analog front-end modules and main processor in oscilloscopes and spectrum analyzers. IC Role / Device Role / Timing Role: Inverting line driver converting processor-level control bits into robust, noise-immune signals for relay and DAC interface circuits. Use Value: Provides 8 mA drive strength to overcome cable capacitance and EMI coupling in mixed-signal chassis environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting line driver/receiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS367ANSR | Non-inverting output logic; identical pinout, timing, and drive specs. | Used where signal polarity must be preserved (e.g., direct address bus extension without inversion). | Select when system logic requires true (non-inverted) signal transmission; otherwise, SN74LS368ANSR is required for inverted paths. |
| SN74LS240N | Octal inverting buffer with dual OE (active-low), same 16-pin PDIP package but different pin mapping and higher ICC. | Designed for high-drive fanout (15 LS-TTL loads); suited for heavier-loaded buses or longer traces. | Choose for higher current demand or through-hole prototyping; SOP-16 SN74LS368ANSR preferred for volume SMT production. |
Compared with SN74LS367ANSR and SN74LS240N, the SN74LS368ANSR uniquely delivers inverting functionality in a RoHS-compliant SOP-16 package with optimized propagation delay for tightly timed legacy bus protocols, making it the precise fit for inverted-data-path implementations requiring surface-mount reliability.
Availability
SN74LS368ANSR is available at Aetrix Electronics and suitable for industrial control backplanes, legacy test equipment interfaces, and embedded system expansion ports requiring stable component supply and long-term obsolescence management.
Supply support for SN74LS368ANSR 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 headquartered in Dallas, Texas, delivering analog, embedded processing, and logic solutions since 1930.
The SN74LS368ANSR belongs to TI's legacy LS-TTL logic family, designed specifically for backward-compatible upgrades and maintenance of industrial, military, and instrumentation systems relying on robust 5 V TTL signaling.
FAQ
What is the maximum clock frequency supported by SN74LS368ANSR?
The SN74LS368ANSR is not a clocked device-it has no internal clock and operates asynchronously. Its usable data rate depends on propagation delay (15 ns max) and system timing margins; it reliably supports bus toggle rates up to 33 MHz in properly terminated 5 V TTL systems. The SN74LS368ANSR does not impose a fixed clock limit but must be applied within setup/hold constraints of connected devices.
Does SN74LS368ANSR support hot-swap or live-insertion?
No, the SN74LS368ANSR does not support hot-swap operation. Its bipolar TTL inputs lack bus-hold or powered-off protection circuitry, and applying signals while VCC is unpowered may cause latch-up or damage. Always power VCC before asserting inputs or outputs. For hot-swap applications, consider newer CMOS alternatives with IOFF and power-sequence immunity.
Can SN74LS368ANSR drive a 50 Ω transmission line directly?
No, the SN74LS368ANSR is not designed for 50 Ω line driving. Its output impedance is ~30 Ω (typical) under load, and driving 50 Ω coaxial or PCB traces causes significant reflections and overshoot. Use external series termination (e.g., 22 Ω resistor) or dedicated line drivers (e.g., SN74LS244) for controlled-impedance interconnects. The SN74LS368ANSR targets board-level, low-to-medium-speed parallel buses-not RF or high-speed serial links.
Is SN74LS368ANSR pin-compatible with SN74LS368AN?
Yes, SN74LS368ANSR and SN74LS368AN share identical pin functions and logic behavior, but differ in package: SN74LS368ANSR uses SOP-16 (NS), while SN74LS368AN uses PDIP-16 (N). Footprints and soldering methods differ, so PCB layout must match the selected package. Electrical specs, timing, and marking ("74LS368A") are functionally equivalent across both variants.
What is the recommended decoupling for SN74LS368ANSR?
Place a 0.1 µF ceramic capacitor between VCC (pin 16) and GND (pin 8), located within 1 cm of the SN74LS368ANSR package. For boards with multiple SN74LS368ANSR devices, add one 4.7 µF tantalum or aluminum electrolytic capacitor per 5–10 ICs near the power entry point. This ensures stable operation during simultaneous output switching and suppresses VCC bounce that could affect adjacent LS-TTL devices.
SN74LS368ANSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 16-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 16-SO
SN74LS368ANSR FAQ
1.How can I place an order for SN74LS368ANSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS368ANSR 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 SN74LS368ANSR reliable?
The price and inventory of SN74LS368ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS368ANSR is usually 5 days.
3.What payment methods are accepted for SN74LS368ANSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS368ANSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS368ANSR?
SN74LS368ANSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS368ANSR 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 SN74LS368ANSR?
For technical support, including SN74LS368ANSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS368ANSR requirements.
6.How does Aetrix verify that SN74LS368ANSR is sourced from the original manufacturer or authorized distributors?
All SN74LS368ANSR 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 SN74LS368ANSR meets industry standards.
7.What is the process for return or replacement of SN74LS368ANSR?
All SN74LS368ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS368ANSR, 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 SN74LS368ANSR part is unused and in its original packaging.
Return procedure for SN74LS368ANSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LS368ANSR Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
