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Texas Instruments SN74LS465N
- Part No.:
- SN74LS465N
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74LS465N.pdf
- Description:
- IC BUFF/DVR TRI-ST 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,598
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Product details
Overview
SN74LS465N from Texas Instruments is an octal bus transceiver with 3-state outputs and inverting logic function, designed for bidirectional data transmission in TTL-level systems. It features ±24mA output drive, 15ns typical propagation delay, and operates from a single 5V supply. It is used in microprocessor address/data bus isolation and memory interfacing.
For engineers reviewing the SN74LS465N datasheet, SN74LS465N pinout, SN74LS465N application, or SN74LS465N equivalent, key selection considerations include its inverting transceiver architecture, 3-state control timing, TTL-compatible input thresholds, and dual-directional bus loading behavior in legacy digital systems.
Technical Context
The SN74LS465N integrates eight independent inverting buffer/driver channels, each with separate enable (G) and direction (DIR) controls. Its 3-state outputs support high-impedance disconnection on both A- and B-side buses, enabling flexible bidirectional flow without external logic.
It uses bipolar Schottky TTL technology, ensuring compatibility with LS-TTL logic families. Input thresholds are VIL = 0.8V max and VIH = 2.0V min, and output voltage levels meet standard TTL VOH/VOL specs at rated load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Inverting octal bus transceiver with 3-state outputs |
| Supply Voltage | 4.75V to 5.25V - ensures stable operation within standard TTL rail tolerance |
| Propagation Delay | 15ns typical (A→B or B→A) - supports synchronous bus cycles up to ~33 MHz in controlled layouts |
| Output Drive | ±24mA - sufficient to drive 20 LS-TTL loads or terminate short stubs on backplanes |
| Input Thresholds | VIL ≤ 0.8V, VIH ≥ 2.0V - guarantees noise margin >400mV with LS-TTL sources |
| Operating Temperature | 0°C to +70°C - suitable for commercial-grade industrial control and instrumentation environments |
Pinout & Package
SN74LS465N is housed in a 20-pin plastic dual in-line package (PDIP) with 0.3-inch body width and standard through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A-side inputs/outputs | Bidirectional data terminals connected to one bus segment; inverted relative to B-side |
| 11, 13, 14, 15, 16, 17, 18, 19 | B-side inputs/outputs | Bidirectional data terminals connected to second bus segment; inverted relative to A-side |
| 9 | G (Output Enable) | Active-low global enable controlling all 3-state outputs simultaneously |
| 10 | DIR (Direction Control) | Controls data flow direction: DIR = LOW enables A→B; DIR = HIGH enables B→A |
| 20 | VCC | +5V power supply connection |
| 12 | GND | Ground reference for logic and output stages |
Key Features
| Feature | Design Value |
|---|---|
| Inverting bidirectional data path | Eliminates need for external inverters when matching inverted bus protocols or legacy controller interfaces |
| Independent DIR and G controls | Enables precise sequencing of bus release and direction change - critical for avoiding bus contention in multiprocessor systems |
| ±24mA output sink/source capability | Drives full LS-TTL fanout without external buffers, reducing component count on dense PCBs |
| Matched propagation delays (A→B vs B→A) | Ensures symmetrical timing in time-critical shared-bus arbitration and DMA cycles |
Applications
| Microprocessor Bus Isolation | Memory Address Latching |
|---|---|
Use Scenario: Isolating CPU address/data bus from peripheral expansion slots in 8-bit systems like Z80 or 6502-based designs. IC Role / Device Role / Timing Role: Bidirectional inverting transceiver managing signal direction and level translation between master and slave buses. Use Value: Prevents bus contention during interrupt-driven I/O and allows hot-plug compatible slot design with controlled enable timing. |
Use Scenario: Latching and buffering address lines between microcontroller and static RAM or EPROM in embedded controllers. IC Role / Device Role / Timing Role: Inverting driver providing clean, slew-controlled address signals with 3-state hold during read/write transitions. Use Value: Reduces address skew across parallel memory arrays and maintains setup/hold margins under varying capacitive loads. |
| Legacy Industrial Controller Backplane | TTL-Level Serial Interface Buffering |
Use Scenario: Interfacing multiple PLC I/O modules over a shared TTL backplane with strict noise immunity requirements. IC Role / Device Role / Timing Role: Direction-controlled bus isolator preventing ground loop coupling and enabling module hot-swap via sequenced DIR/G asserts. Use Value: Maintains signal integrity across 10+ inch traces while supporting deterministic bus arbitration in real-time control loops. |
Use Scenario: Level-shifting and driving RS-232 line drivers or UART handshaking lines in older test equipment. IC Role / Device Role / Timing Role: Inverting buffer stage converting internal logic levels to robust TTL-compatible control signals. Use Value: Provides noise-immune handshaking (RTS/CTS) with guaranteed 400mV noise margin and fast edge rates for reliable serial framing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS245N | Non-inverting octal transceiver; identical pinout and timing but no logic inversion | Suitable where bus protocol requires direct (non-inverted) data flow, e.g., most standard data bus extensions | Select SN74LS245N when system logic does not require inversion; SN74LS465N remains necessary where inversion is built into bus handshake or address decoding. |
| SN74ALS465AN | Advanced LS version with lower power (19mW vs 48mW), faster tpd (10ns), and tighter VIH/VIL thresholds | Better suited for high-density, low-power, or higher-speed upgrades where board layout allows same footprint | SN74ALS465AN offers performance upgrade path; verify compatibility with existing enable/direction timing margins before substitution. |
Compared with SN74LS245N and SN74ALS465AN, the SN74LS465N uniquely provides inverting logic in a standard LS-TTL package, making it irreplaceable in legacy designs where inversion is embedded in bus protocol timing or address mapping - neither alternative delivers identical functional behavior without circuit redesign.
Availability
SN74LS465N is available at Aetrix Electronics and suitable for microprocessor bus isolation, memory address latching, and legacy industrial controller backplane applications requiring stable component supply and long-term obsolescence management.
Supply support for SN74LS465N 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 for industrial, automotive, and communications markets.
The SN74LS465N belongs to TI's classic 74LS logic family, developed for high-reliability, medium-speed TTL-compatible digital systems where predictable timing, noise immunity, and interoperability with legacy components are essential.
FAQ
What is the logic function of the SN74LS465N?
The SN74LS465N is an inverting octal bus transceiver with 3-state outputs. Each channel passes data from A to B or B to A with logical inversion, and all outputs enter high-impedance state when G is high. Its DIR pin determines direction, and it operates strictly at 5V TTL levels - no CMOS or mixed-voltage support.
Does the SN74LS465N support non-inverting operation?
No, the SN74LS465N performs fixed inverting logic on all data paths - there is no mode or configuration to disable inversion. For non-inverting behavior, the SN74LS245N is the direct functional counterpart with identical pinout and timing, differing only in logic polarity.
What are the recommended operating conditions for SN74LS465N?
The SN74LS465N must be operated at VCC = 4.75V–5.25V and ambient temperature 0°C–70°C. Exceeding these ranges risks timing violations or output drive degradation. Input voltages must stay within 0V–5.5V, and outputs should not source/sink beyond ±24mA continuously.
Can SN74LS465N replace SN74LS245N in an existing design?
No - the SN74LS465N cannot directly replace SN74LS245N without logic redesign because it inverts all data bits. Swapping them causes functional failure unless upstream/downstream logic compensates for inversion. Verify bus protocol specification before substitution.
Is SN74LS465N still in active production?
Texas Instruments lists SN74LS465N as active and available through authorized distributors. While newer logic families exist, TI continues manufacturing this part for legacy system support, with documented lifecycle commitments and no announced discontinuance date for the PDIP variant.
SN74LS465N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- -
- 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:
- 20-PDIP
SN74LS465N FAQ
1.How can I place an order for SN74LS465N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS465N 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 SN74LS465N reliable?
The price and inventory of SN74LS465N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS465N is usually 5 days.
3.What payment methods are accepted for SN74LS465N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS465N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS465N?
SN74LS465N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS465N 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 SN74LS465N?
For technical support, including SN74LS465N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS465N requirements.
6.How does Aetrix verify that SN74LS465N is sourced from the original manufacturer or authorized distributors?
All SN74LS465N 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 SN74LS465N meets industry standards.
7.What is the process for return or replacement of SN74LS465N?
All SN74LS465N units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS465N, 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 SN74LS465N part is unused and in its original packaging.
Return procedure for SN74LS465N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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