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Texas Instruments SN74AS760N
- Part No.:
- SN74AS760N
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74AS760N.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:158
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Product details
Overview
SN74AS760N from Texas Instruments is a dual 4-bit non-inverting open-collector buffer/line driver IC designed for memory address bus driving and clock distribution in TTL-compatible systems. It features two independent 4-bit channels, pnp input structure for reduced DC loading, symmetrical active-low output-enable (OE) inputs, and delivers 64 mA low-level output current at VCC = 4.5 V. It operates across 0°C to 70°C and is housed in a 20-pin plastic DIP (N) package.
For engineers reviewing the SN74AS760N datasheet, SN74AS760N pinout, SN74AS760N application, or SN74AS760N equivalent, this device is selected for high-current bus interfacing where 3-state overlap protection elimination, fast enable/disable timing (tPHL/tPLH ≤ 7 ns), and robust open-collector drive capability are critical in legacy TTL and mixed-logic memory subsystems.
Technical Context
The SN74AS760N implements two independent 4-bit non-inverting buffer sections, each with dedicated active-low output-enable (1OE, 2OE) controlling all four outputs per section. Its pnp input stage minimizes input current draw, reducing loading on preceding logic stages-especially beneficial in dense address decoding trees. The open-collector outputs allow wired-AND bus configurations and direct interface to higher-voltage buses up to 7 V.
Timing behavior is characterized with CL = 50 pF and RL = 500 Ω: propagation delay from A to Y is 1–7 ns (tPHL) and 3–18.5 ns (tPLH); enable-to-output delays (tPHL/tPLH from OE to Y) are 1–7 ns and 3–18.5 ns respectively. These values reflect its Advanced Schottky (AS) process, optimized for speed over standard ALS variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced Schottky TTL (AS), fully compatible with 74LS/74ALS input thresholds and drive levels |
| Supply Voltage | 4.5 V to 5.5 V - supports stable operation across standard TTL rail tolerances |
| Output Type | Open-collector - enables wired-AND bus structures and level translation up to 7 V external pull-up |
| IOL (max) | 64 mA per output - sufficient to drive multiple TTL loads or memory address lines without buffering |
| Propagation Delay | 1–7 ns (A→Y tPHL) - ensures tight timing margins in high-speed address latching and clock fanout |
| Enable Delay | 1–7 ns (OE→Y tPHL) - minimizes bus contention window during 3-state transitions |
| Operating Temp | 0°C to 70°C - qualified for commercial-grade embedded and industrial control applications |
Pinout & Package
SN74AS760N is supplied in a 20-pin plastic dual in-line package (PDIP-N), 300-mil width, with standard through-hole mounting and 0.1-inch pin pitch. Pin 1 is located at the top-left corner when viewed from the top with notch or dot orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output-enable inputs | Enable/disable all four outputs of respective 4-bit sections; low = outputs active (sinking), high = high-impedance |
| 1A1–1A4, 2A1–2A4 | Non-inverting data inputs | Eight total inputs grouped as two independent 4-bit channels; directly drive corresponding Y outputs when OE is asserted |
| 1Y1–1Y4, 2Y1–2Y4 | Open-collector outputs | Eight open-collector outputs; require external pull-up resistors; support bus arbitration and voltage-level flexibility |
| VCC | Positive supply | Connects to +5 V rail; powers internal logic and output transistors |
| GND | Ground reference | Common return path for supply and signal references; must be low-impedance for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Eliminates 3-state overlap protection | Enables safe bus sharing without external timing coordination between OE signals of multiple drivers |
| pnp input structure | Reduces input current to ≤20 µA (IIH) and −1 mA (IIL), minimizing loading on upstream address generators or decoders |
| Symmetrical active-low OE inputs | Allows synchronous enable/disable of both 4-bit sections using shared control logic or independent gating |
| Open-collector output compatibility | Supports direct connection to 5 V, 12 V, or 24 V buses via external pull-up, enabling mixed-voltage system interfacing |
| AS-series speed-power optimization | Delivers 6 ns typical tPHL at 5 V while maintaining <94 mA ICC (outputs low), outperforming ALS equivalents by >2× in speed |
Applications
| Memory Address Bus Driver | System Clock Distribution |
|---|---|
Use Scenario: Driving 16-bit memory address lines from a microprocessor or address latch in an 8-bit or 16-bit embedded system. IC Role / Device Role / Timing Role: Non-inverting octal buffer providing high-current sinking capability to ensure clean TTL-level address signals across long PCB traces or backplane stubs. Use Value: 64 mA IOL per output guarantees reliable logic-low assertion under capacitive and fanout loads typical in static RAM or EPROM address decoding. | Use Scenario: Distributing a master system clock to multiple peripheral controllers or timing-critical peripherals requiring synchronized enable timing. IC Role / Device Role / Timing Role: Dual-channel clock buffer with matched enable-to-output delay (≤7 ns) ensuring simultaneous clock edge delivery across multiple destinations. Use Value: Sub-7 ns tPHL(OE→Y) eliminates skew-induced setup/hold violations when enabling clock paths in multi-chip timing domains. |
| Bus Transceiver Interface | TTL-to-Higher-Voltage Logic Translation |
Use Scenario: Implementing a unidirectional data bus driver in a legacy industrial controller with shared address/data multiplexing. IC Role / Device Role / Timing Role: Open-collector octal driver enabling wired-AND arbitration between multiple bus masters via external pull-up and enable sequencing. Use Value: Elimination of 3-state overlap protection simplifies control logic and prevents bus contention during power-up or reset transitions. | Use Scenario: Interfacing 5 V TTL logic to 12 V relay drivers or optocoupler inputs in factory automation I/O modules. IC Role / Device Role / Timing Role: Level-translating buffer using open-collector outputs pulled to 12 V, preserving TTL input compatibility while sourcing higher-voltage loads. Use Value: Rated 7 V off-state output voltage tolerance allows safe operation with 12 V pull-ups without clamping diodes or external protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal open-collector buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS760N | Lower IOL (24 mA), slower tPHL (up to 12 ns), lower ICC (19 mA max), ALS-family process | Preferred where power efficiency and moderate speed suffice; unsuitable for high-fanout or sub-10 ns timing-critical buses | Select SN74ALS760N only if system load requires ≤24 mA sink and timing budget allows ≥12 ns delays. |
| SN74AS244N | Same AS family, but with 3-state (not open-collector) outputs; includes complementary OE/OE inputs | Used where bidirectional bus control or strict 3-state isolation is required; incompatible with wired-AND or external pull-up architectures | Choose SN74AS244N only when 3-state operation is mandatory and open-collector functionality is not needed. |
Compared with SN74ALS760N and SN74AS244N, the SN74AS760N uniquely combines high-current open-collector drive (64 mA), sub-7 ns enable timing, and overlap-protection elimination-making it irreplaceable in legacy TTL bus designs demanding both robustness and speed without redesigning bus topology.
Availability
SN74AS760N is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, bus interfacing, and TTL-to-higher-voltage translation requiring stable component supply and long-term obsolescence management.
Supply support for SN74AS760N 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 solutions for industrial, automotive, and communications markets.
The SN74AS760N belongs to TI's legacy Advanced Schottky TTL logic family, engineered specifically to replace 74LS/74ALS buffers in high-density memory and bus systems where speed, current drive, and open-collector flexibility are essential.
FAQ
What is the maximum output sink current specification for SN74AS760N?
The SN74AS760N is rated for a minimum low-level output current (IOL) of 48 mA and a maximum of 64 mA per output at VCC = 4.5 V, as specified in the switching characteristics table. This high sink capability enables direct driving of multiple TTL inputs or memory address lines without intermediate buffering, and is a key differentiator from ALS-family equivalents like SN74ALS760N (24 mA max).
Does SN74AS760N support 3-state operation?
No, SN74AS760N does not support true 3-state (high-impedance) operation. It features open-collector outputs controlled by active-low output-enable (OE) inputs: when OE is high, outputs are in high-impedance (open), and when OE is low, outputs actively sink current. Unlike 3-state devices such as SN74AS244N, SN74AS760N lacks a totem-pole high-side driver and cannot source current-only sink.
Can SN74AS760N be used with a 12 V pull-up resistor?
Yes, SN74AS760N supports off-state output voltages up to 7 V per absolute maximum ratings, and its open-collector outputs tolerate external pull-up voltages beyond VCC. While 12 V exceeds the 7 V absolute max, safe operation requires external clamping (e.g., 5.1 V Zener to GND) or use of a series current-limiting resistor. For robust 12 V interfacing, verify layout and transient conditions per TI application notes on open-collector bus design.
What is the operating temperature range for SN74AS760N?
The SN74AS760N is characterized for operation from 0°C to 70°C, consistent with commercial-grade TTL logic. This range is explicitly defined in the recommended operating conditions table and distinguishes it from the military-grade SN54AS760 (−55°C to 125°C). Designs targeting extended temperature environments must select the SN54AS760 variant or confirm derating compliance per TI's thermal guidelines.
How does SN74AS760N eliminate the need for 3-state overlap protection?
SN74AS760N eliminates 3-state overlap protection by using open-collector outputs with strictly defined enable timing: when OE transitions from low to high, outputs enter high-impedance state within ≤7 ns (tPHZ), and no shoot-through current path exists between drivers. This deterministic disable behavior-combined with absence of active pull-up circuitry-prevents bus contention during enable/disable transitions, removing the need for external delay networks or synchronized OE sequencing.
SN74AS760N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- Open Collector
- Current - Output High, Low:
- -, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74AS760N FAQ
1.How can I place an order for SN74AS760N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS760N 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 SN74AS760N reliable?
The price and inventory of SN74AS760N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS760N is usually 5 days.
3.What payment methods are accepted for SN74AS760N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS760N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS760N?
SN74AS760N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS760N 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 SN74AS760N?
For technical support, including SN74AS760N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS760N requirements.
6.How does Aetrix verify that SN74AS760N is sourced from the original manufacturer or authorized distributors?
All SN74AS760N 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 SN74AS760N meets industry standards.
7.What is the process for return or replacement of SN74AS760N?
All SN74AS760N units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS760N, 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 SN74AS760N part is unused and in its original packaging.
Return procedure for SN74AS760N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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