My Inquiry
My Account
Texas Instruments SN74AS756DW
- Part No.:
- SN74AS756DW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AS756DW.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:140
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74AS756DW from Texas Instruments is an octal noninverting 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 (1OE, 2OE), pnp input structure for reduced DC loading, and operates at 4.5–5.5 V over 0°C to 70°C. Its 64 mA low-level output current supports direct drive of terminated bus lines.
For engineers reviewing the SN74AS756DW datasheet, SN74AS756DW pinout, SN74AS756DW application, or SN74AS756DW equivalent, key selection criteria include open-collector drive capability, 3-state overlap elimination, fan-out density for address buffering, and compatibility with legacy AS-family timing and logic families.
Technical Context
The SN74AS756DW implements two independent 4-bit noninverting buffer sections, each with dedicated active-low output-enable control (1OE and 2OE). Its pnp input stage minimizes input current draw, enabling high fan-in without excessive loading on upstream drivers.
All outputs are open-collector, requiring external pull-up resistors, and support up to 64 mA sink current per output at VCC = 4.5 V. Propagation delays range from 1 ns (tPHL) to 19.5 ns (tPLH), optimized for high-speed address and clock line buffering where 3-state contention must be avoided.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal noninverting buffer with dual 4-bit channels and independent OE controls |
| Output Type | Open-collector - enables wired-OR bus interfacing and level translation via external pull-up |
| IOL (max) | 64 mA per output - sufficient to drive standard 50 Ω terminated transmission lines or multiple TTL inputs |
| tPHL / tPLH | 1 ns / 19.5 ns (VCC = 4.5–5.5 V, CL = 50 pF) - supports >50 MHz address/clock edge rates in buffered paths |
| VCC Range | 4.5 V to 5.5 V - compatible with regulated 5 V supply rails and tolerant of typical rail variation |
| Operating Temperature | 0°C to 70°C - rated for commercial-grade industrial and computing applications |
| Input Structure | pnp-based - reduces DC input loading to ≤0.5 mA (IIL), preserving drive strength of preceding logic stages |
Pinout & Package
SN74AS756DW is housed in a 20-pin SOIC (DW) package, 7.5 mm wide, 12.83 mm long, with 1.27 mm pitch and 2.65 mm max height. Pin 1 is marked by a beveled corner or notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1OE (Active-Low Output Enable) | Enables/disables first 4-bit channel (1Y1–1Y4); low = outputs active, high = high-impedance |
| 2–5, 8–9 | 1A1–1A4, 2A1–2A4 | Noninverting data inputs for both 4-bit channels |
| 12–14, 16, 18 | 1Y1–1Y4, 2Y1–2Y4 | Open-collector outputs - require external pull-up; sink up to 64 mA each |
| 19 | 2OE (Active-Low Output Enable) | Enables/disables second 4-bit channel (2Y1–2Y4); independent control from 1OE |
| 10 | GND | Ground reference for all logic and output stages |
| 20 | VCC | Positive supply (4.5–5.5 V) for internal logic and output pull-down transistors |
Key Features
| Feature | Design Value |
|---|---|
| Eliminates 3-state overlap protection | Open-collector outputs prevent bus contention during enable/disable transitions - no external arbitration logic required |
| Dual independent output-enable controls | 1OE and 2OE allow staggered or selective activation of two 4-bit groups - enables partial bus gating without full rebuffering |
| pnp input structure | Reduces input current to ≤0.5 mA (IIL), minimizing loading on upstream AS/ALS drivers and improving system fan-out scalability |
| High sink current per output | 64 mA IOL rating supports direct interface to terminated buses, memory address latches, and LED indicators without external drivers |
| AS-family speed and noise immunity | Sub-20 ns propagation delay with tight skew (<1 ns tPHL/tPLH delta) ensures clean timing margins in synchronous address paths |
Applications
| Memory Address Buffering | Bus Transceiver Interface |
|---|---|
|
Use Scenario: Driving 16-bit memory address bus from microprocessor or FPGA output pins with limited drive strength. IC Role / Device Role / Timing Role: Noninverting octal buffer providing current gain and isolation between controller and memory subsystem. Use Value: Eliminates need for discrete transistor arrays or additional 3-state logic; open-collector outputs simplify bus arbitration with multiple masters. |
Use Scenario: Level-shifting and bidirectional bus control in legacy 5 V parallel interfaces (e.g., ISA, custom backplane). IC Role / Device Role / Timing Role: Open-collector line driver enabling wired-OR bus topology and voltage translation via pull-up selection. Use Value: Supports mixed-voltage signaling (e.g., 5 V bus with 3.3 V controller) using appropriate pull-up voltage; eliminates level-shifter ICs. |
| Clock Distribution Network | Legacy System Bus Driver |
|
Use Scenario: Distributing a single clock signal to multiple memory or peripheral chips while maintaining edge integrity. IC Role / Device Role / Timing Role: Low-skew, high-drive buffer replicating clock to multiple loads without fan-out degradation. Use Value: 1 ns tPHL ensures minimal clock skew across 8 outputs; pnp inputs reduce jitter contribution from source driver loading. |
Use Scenario: Interfacing modern controllers to vintage peripherals requiring TTL-compatible open-collector handshake signals (e.g., READY, WAIT, IRQ). IC Role / Device Role / Timing Role: Robust 64 mA sink driver for generating active-low control strobes with fast fall times. Use Value: Meets strict timing requirements of legacy bus protocols (e.g., <10 ns fall time into 50 Ω load) without external components. |
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 |
|---|---|---|---|
| SN74AS240N | Octal inverting buffer with 3-state (not open-collector) outputs; identical pinout but different logic polarity and output architecture | Requires redesign of enable logic and bus termination; not drop-in for wired-OR or level-shift use cases | Select only if 3-state operation and inversion are acceptable and bus contention is managed externally |
| SN74AS244DW | Octal noninverting buffer with 3-state (not open-collector) outputs; same DW package, but lacks open-collector sink capability | Cannot perform wired-OR or level translation; requires separate bus arbitration or pull-up networks | Choose when high-impedance tri-state behavior is needed instead of open-collector bus driving |
Compared with SN74AS240N and SN74AS244DW, the SN74AS756DW uniquely provides open-collector outputs with 64 mA sink capability and dual independent enables - making it irreplaceable for bus arbitration, level translation, and legacy TTL bus driving where 3-state overlap must be eliminated.
Availability
SN74AS756DW is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, legacy bus interfacing, and industrial control systems requiring stable component supply across extended production lifecycles.
Supply support for SN74AS756DW 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 decades of legacy product support and military-grade qualification heritage.
The SN74AS756DW belongs to TI's Advanced Schottky (AS) logic family, engineered for high-speed, low-power 5 V TTL-compatible systems where timing precision, bus drive strength, and reliability in industrial environments are critical.
FAQ
What is the maximum sink current per output on the SN74AS756DW?
The SN74AS756DW supports up to 64 mA of low-level output current (IOL) per open-collector output when VCC = 4.5 V, enabling direct drive of terminated transmission lines, multiple TTL inputs, or indicator LEDs without external amplification. This rating is confirmed under recommended operating conditions and verified in the SDAS040B datasheet Table 3.
Does the SN74AS756DW have 3-state outputs or open-collector outputs?
The SN74AS756DW has open-collector outputs - not 3-state. Each output can sink current when enabled but presents high impedance only when its respective output-enable input (1OE or 2OE) is high. There is no active-high output state; external pull-up resistors are mandatory for logic HIGH assertion.
Can the SN74AS756DW replace the SN74AS244 in a design?
No - the SN74AS756DW cannot directly replace the SN74AS244 because the latter features 3-state (totem-pole) outputs, while the SN74AS756DW uses open-collector outputs. Substitution would require changes to pull-up network design, enable logic polarity, and bus arbitration strategy, as wired-OR functionality and level translation are inherent to SN74AS756DW but absent in SN74AS244.
What is the operating temperature range for the SN74AS756DW?
The SN74AS756DW is characterized for operation from 0°C to 70°C, consistent with commercial-grade specifications. This range is explicitly defined in the "recommended operating conditions" table of the SDAS040B datasheet and applies to all DW-package variants including SN74AS756DW and SN74AS756DW.A.
Is the SN74AS756DW RoHS compliant?
Yes - the SN74AS756DW is RoHS compliant, with NiPdAu (NIPDAU) lead finish and moisture sensitivity level (MSL) rating of Level-1 at 260°C peak reflow. This compliance is documented in TI's Package Option Addendum (15-Jul-2026), confirming suitability for lead-free assembly processes.
SN74AS756DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, 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:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AS756DW FAQ
1.How can I place an order for SN74AS756DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS756DW 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 SN74AS756DW reliable?
The price and inventory of SN74AS756DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS756DW is usually 5 days.
3.What payment methods are accepted for SN74AS756DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS756DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS756DW?
SN74AS756DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS756DW 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 SN74AS756DW?
For technical support, including SN74AS756DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS756DW requirements.
6.How does Aetrix verify that SN74AS756DW is sourced from the original manufacturer or authorized distributors?
All SN74AS756DW 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 SN74AS756DW meets industry standards.
7.What is the process for return or replacement of SN74AS756DW?
All SN74AS756DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS756DW, 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 SN74AS756DW part is unused and in its original packaging.
Return procedure for SN74AS756DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74AS756DW 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…
