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Texas Instruments SN74ALS760DW
- Part No.:
- SN74ALS760DW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS760DW.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,017
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Product details
Overview
SN74ALS760DW from Texas Instruments is an octal buffer/line driver with open-collector outputs, designed for memory address bus driving and clock distribution in TTL-compatible systems. It features dual 4-bit channels, symmetrical active-low output-enable (OE) inputs, pnp input structure for reduced DC loading, and operates at 4.5–5.5 V over 0°C to 70°C.
For engineers reviewing the SN74ALS760DW datasheet, SN74ALS760DW pinout, SN74ALS760DW application, or SN74ALS760DW equivalent, key selection criteria include open-collector drive capability (24 mA sink), propagation delay (5–15 ns), dual independent OE control, ALS logic family compatibility, and SOIC-20 packaging for high-density board layouts.
Technical Context
The SN74ALS760DW implements two independent 4-bit non-inverting buffer sections, each with dedicated active-low output-enable (1OE, 2OE) controlling open-collector outputs (1Y1–1Y4, 2Y1–2Y4). Inputs (1A1–1A4, 2A1–2A4) use pnp transistor structures to minimize DC loading on upstream drivers.
Its open-collector architecture enables wired-AND bus interfacing and direct connection to memory address registers without 3-state overlap protection circuitry. Output voltage swing is rail-to-rail relative to external pull-up, supporting TTL- and CMOS-compatible logic levels when terminated appropriately.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation across standard TTL power rails with ±5% tolerance. |
| Output Sink Current | 24 mA per output - Supports direct drive of multiple TTL loads or termination resistors on shared buses. |
| Propagation Delay | 5 ns (min) to 15 ns (max) - Enables reliable timing in 20–30 MHz address/clock distribution paths. |
| Input Voltage Thresholds | VIL = 0.8 V, VIH = 2.0 V - Guarantees noise-immune switching with standard TTL logic families. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial-grade embedded and industrial control applications. |
| Logic Family | ALS (Advanced Low-Power Schottky) - Delivers lower power than standard LS while maintaining speed parity. |
Pinout & Package
SN74ALS760DW is housed in a 20-pin plastic small-outline integrated circuit (SOIC) package (DW), 7.5 mm wide, 12.8 mm long, 2.65 mm max height, with 1.27 mm pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Channel 1 output-enable (active-low) | Disables all four 1Y outputs simultaneously; high-impedance state when asserted high. |
| 1A1–1A4 | Channel 1 data inputs | Non-inverting inputs driving corresponding 1Y1–1Y4 open-collector outputs. |
| 2OE | Channel 2 output-enable (active-low) | Independent control of 2Y1–2Y4; allows asynchronous channel gating. |
| 2A1–2A4 | Channel 2 data inputs | Separate 4-bit input path with no internal coupling to Channel 1. |
| 1Y1–1Y4, 2Y1–2Y4 | Open-collector outputs | Require external pull-up; support wired-AND, bus arbitration, and level translation. |
| VCC (Pin 20) | Positive supply | Must be decoupled locally; powers both channels and input buffers. |
| GND (Pin 10) | Ground reference | Common return for all I/O and internal circuitry; critical for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Open-collector outputs | Enable direct bus-line driving and wired-AND logic without external diodes or clamps. |
| Dual independent OE controls | Allow interleaved or staggered enable timing between channels to reduce simultaneous switching noise. |
| pnp input structure | Reduces input current loading by >90% vs. standard TTL, easing drive requirements for upstream logic. |
| ALS logic family | Combines LS-speed performance (15 ns max delay) with ~30% lower ICC than standard LS at 5 V. |
| No 3-state overlap protection needed | Eliminates external RC networks or timing sequencers required with traditional 3-state drivers. |
Applications
| Memory Address Buffering | System Clock Distribution |
|---|---|
|
Use Scenario: Driving 16-bit address bus lines from a microprocessor or FPGA to multiple memory ICs (SRAM, EPROM). IC Role / Device Role / Timing Role: Non-inverting octal buffer providing fanout and level-shifting via open-collector outputs with external pull-ups. Use Value: Eliminates need for discrete transistors or additional 3-state logic, reducing BOM count and PCB area while ensuring clean address transitions. |
Use Scenario: Distributing a single system clock signal to multiple synchronous peripherals (e.g., UARTs, timers, ADCs). IC Role / Device Role / Timing Role: Dual-channel clock driver with independent OE pins enabling dynamic clock gating per subsystem. Use Value: Minimizes skew across destinations (<15 ns max delay variation) and supports low-power modes via OE-controlled shutdown. |
| Bus Transceiver Interface | Legacy Peripheral Expansion |
|
Use Scenario: Interfacing a microcontroller's data/address bus to legacy ISA-style expansion slots requiring wired-AND handshake signals. IC Role / Device Role / Timing Role: Open-collector line driver implementing bidirectional bus control (e.g., /IOR, /IOW, /MEMR) with pull-up termination. Use Value: Provides robust noise margin and current drive (24 mA) for long traces and multiple load capacitances typical in backplane designs. |
Use Scenario: Adding parallel port or GPIO expansion to industrial controllers using TTL-level peripheral chips (e.g., 8255, 74LS373). IC Role / Device Role / Timing Role: Level-translating buffer between modern MCU I/O and legacy 5 V TTL peripherals with asymmetric voltage thresholds. Use Value: Matches VIH/VIL specs (2.0 V/0.8 V) to ensure reliable recognition of logic states despite voltage drop across long cables or connectors. |
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 |
|---|---|---|---|
| SN74AS760DW | Faster propagation (1–7 ns vs. 5–15 ns) but higher ICC (60–94 mA vs. 9–19 mA); AS family, not ALS. | Better suited for high-speed clock trees where power is secondary; less ideal for battery-powered or thermally constrained designs. | Select SN74AS760DW only if sub-10 ns timing is mandatory and thermal/power budgets allow doubling of supply current. |
| SN74LS244N | Standard LS family; slower (20–45 ns), lower drive (15 mA), no pnp inputs; PDIP-20 only. | Compatible pinout but requires layout change for SOIC; suitable for cost-sensitive, non-speed-critical upgrades of legacy LS designs. | Choose SN74LS244N for drop-in replacement in existing LS-based systems where SOIC packaging is not required. |
Compared with SN74ALS760DW, SN74AS760DW trades power efficiency for speed, while SN74LS244N offers broader legacy compatibility at the expense of performance and modern packaging - making SN74ALS760DW optimal for balanced speed, density, and thermal design in new commercial-grade implementations.
Availability
SN74ALS760DW is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, bus interface, and legacy peripheral expansion requiring stable component supply and long-term industrial availability.
Supply support for SN74ALS760DW 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, delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ALS760DW belongs to TI's legacy TTL logic portfolio, engineered specifically to replace discrete buffer arrays and simplify memory and bus interface design in 1980s–1990s-era digital systems while maintaining backward compatibility.
FAQ
What is the maximum sink current per output of the SN74ALS760DW?
The SN74ALS760DW guarantees a minimum sink current of 24 mA per open-collector output under recommended operating conditions (VCC = 4.5 V, TA = 0°C to 70°C). This rating ensures reliable drive of multiple TTL inputs or termination resistors on shared buses without exceeding VOL limits (0.35–0.5 V). Exceeding 24 mA may degrade output voltage compliance or increase junction temperature beyond safe limits.
Does the SN74ALS760DW require external pull-up resistors on its outputs?
Yes, the SN74ALS760DW requires external pull-up resistors on all open-collector outputs (1Y1–1Y4 and 2Y1–2Y4) to establish defined high-level logic states. Typical values range from 1 kΩ to 10 kΩ depending on bus capacitance and rise-time requirements. Without pull-ups, outputs remain floating when not actively sinking current, risking undefined logic levels and system instability.
Can the SN74ALS760DW operate with a 3.3 V supply?
No, the SN74ALS760DW is not rated for 3.3 V operation. Its absolute maximum supply voltage is 7 V, but the recommended operating range is strictly 4.5 V to 5.5 V. At 3.3 V, input thresholds (VIH = 2.0 V, VIL = 0.8 V) and output drive capability fall outside specification, resulting in unreliable switching and potential functional failure. Use 74LVC244 or similar 3.3 V–compatible buffers instead.
What is the purpose of the pnp input structure in the SN74ALS760DW?
The pnp input structure in the SN74ALS760DW reduces DC input loading by limiting input current to ≤20 µA (IIH) and ≤−0.1 mA (IIL), significantly lower than standard TTL inputs. This eases drive requirements for upstream logic gates or microcontroller I/O pins, minimizes cumulative loading on shared signal lines, and improves noise immunity in high-fanout configurations - a key advantage in dense memory address routing.
How does the SN74ALS760DW differ from the SN74ALS244 in functionality?
The SN74ALS760DW differs from the SN74ALS244 by featuring dual independent active-low output-enable (1OE and 2OE) inputs - one per 4-bit channel - whereas the SN74ALS244 has a single OE controlling all eight outputs. This enables selective channel activation, critical for reducing simultaneous switching noise and implementing staggered bus access protocols in memory and peripheral interfaces.
SN74ALS760DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- -, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ALS760DW FAQ
1.How can I place an order for SN74ALS760DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS760DW 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 SN74ALS760DW reliable?
The price and inventory of SN74ALS760DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS760DW is usually 5 days.
3.What payment methods are accepted for SN74ALS760DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS760DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS760DW?
SN74ALS760DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS760DW 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 SN74ALS760DW?
For technical support, including SN74ALS760DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS760DW requirements.
6.How does Aetrix verify that SN74ALS760DW is sourced from the original manufacturer or authorized distributors?
All SN74ALS760DW 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 SN74ALS760DW meets industry standards.
7.What is the process for return or replacement of SN74ALS760DW?
All SN74ALS760DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS760DW, 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 SN74ALS760DW part is unused and in its original packaging.
Return procedure for SN74ALS760DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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