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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

Texas Instruments SN74AS757DWE4

Name: SN74AS757DWE4
Brand: Texas Instruments
SKU: SN74AS757DWE4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74AS757DWE4

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: SN74AS757DWE4.pdf

Description:: IC BUFF/DVR DUAL N-INV 20SOIC

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Product details

Overview

SN74AS757DWE4 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 independent output-enable controls (1OE, 2OE), pnp input structure for reduced DC loading, and operates over 0°C to 70°C at VCC = 4.5–5.5 V. Its 20-pin SOIC (DW) package supports high-density PCB layouts in industrial control and legacy computing interfaces.

For engineers reviewing the SN74AS757DWE4 datasheet, SN74AS757DWE4 pinout, SN74AS757DWE4 application, or SN74AS757DWE4 equivalent, key selection criteria include open-collector drive capability (64 mA sink), propagation delay (1–6 ns), dual OE control logic, pnp-input low input current (−1 mA IIL on A inputs), and compatibility with AS-series timing-critical bus systems.

Technical Context

This device implements two independent 4-bit noninverting buffer sections (1A1–1A4 → 1Y1–1Y4; 2A1–2A4 → 2Y1–2Y4), each with dedicated active-low output-enable (1OE, 2OE). All outputs are open-collector, enabling wired-AND bus configurations and direct interface to 5-V TTL or CMOS loads without level-shifting.

The pnp input stage reduces input current loading (IIL = −1 mA max on A inputs at VI = 0.4 V), improving fan-in in multi-driver address buses. Propagation delays are asymmetric: tPHL (1–6 ns) is significantly faster than tPLH (3–18.5 ns), reflecting optimized low-to-high transition design for enable-controlled bus release timing.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	4.5 V to 5.5 V - Ensures stable operation across standard 5-V TTL supply tolerances.
IOL (Max)	64 mA - Supports direct drive of multiple TTL inputs or termination resistors on shared buses.
tPHL (A→Y)	1–6 ns - Enables fast bus release critical for high-speed memory address strobing.
tPLH (A→Y)	3–18.5 ns - Matches typical bus settle time requirements for controlled turn-on sequencing.
IIL (A inputs)	−1 mA - Low DC loading preserves signal integrity in fan-out-constrained address decoders.
Operating Temp	0°C to 70°C - Qualified for commercial-grade embedded systems and industrial control panels.
Output Type	Open-collector - Allows wired-AND logic, bus arbitration, and mixed-voltage interface via external pull-up.

Pinout & Package

SN74AS757DWE4 uses a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body, 1.27 mm pitch, 2.65 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1.

Pin/Terminal	Circuit Role	Design Meaning
1	1OE	Active-low enable for first 4-bit buffer section (1Y1–1Y4).
2–5, 7–8	1A1–1A4, 2A1–2A2	Noninverting input terminals for respective buffer sections.
9–10, 12–14	2Y1–2Y4, 1Y1–1Y4	Open-collector outputs; require external pull-up for logic HIGH.
11, 19	2OE, GND	Active-low enable for second 4-bit section; ground reference terminal.
15–18, 20	2A3–2A4, VCC	Remaining inputs and positive supply rail (VCC = 4.5–5.5 V).

Key Features

Feature	Design Value
Dual independent OE controls	Enables selective activation of two 4-bit groups-critical for interleaved memory bank addressing.
pnp input structure	Reduces input current loading by >5× vs. standard TTL, minimizing voltage droop on shared address lines.
Open-collector outputs	Supports wired-AND bus arbitration and mixed-voltage interfacing without additional level translators.
High-speed tPHL	1 ns min / 6 ns max enables sub-10 ns bus release-essential for 10+ MHz address strobe timing.
AS-series logic family	Delivers 2× speed and 3× noise margin vs. standard TTL, with guaranteed performance at 5.5 V.

Applications

Memory Address Buffering	Legacy Bus Transceiver Interface
Use Scenario: Driving 16-bit address bus in 8086/8088-based industrial controllers with multiple memory banks. IC Role / Device Role / Timing Role: Noninverting octal buffer with dual OE control isolates address segments during bank switching. Use Value: 64 mA sink capability drives 10+ TTL loads per output; fast tPHL ensures clean address hold timing during bank transitions.	Use Scenario: Interfacing ISA bus peripherals requiring open-collector handshake signals (IOR#, IOW#). IC Role / Device Role / Timing Role: Level-translating line driver converting CMOS control logic to 5-V TTL bus voltages. Use Value: Open-collector outputs enable wired-AND of multiple peripheral ready signals without contention.
Clock Distribution Network	Industrial PLC I/O Expansion
Use Scenario: Distributing system clock to multiple synchronous latch ICs in programmable logic controllers. IC Role / Device Role / Timing Role: Low-skew buffer section delivering synchronized clock edges to parallel I/O modules. Use Value: Matched tPHL/tPLH propagation ensures <1 ns skew between outputs-maintaining setup/hold margins.	Use Scenario: Expanding discrete input scanning in DIN-rail mounted PLC backplanes with shared interrupt lines. IC Role / Device Role / Timing Role: Wired-AND combiner for multiple module fault signals feeding single controller interrupt pin. Use Value: Dual OE allows dynamic isolation of faulty modules during hot-swap diagnostics without bus disruption.

Memory Address Buffering

Legacy Bus Transceiver Interface

Use Scenario: Driving 16-bit address bus in 8086/8088-based industrial controllers with multiple memory banks.

IC Role / Device Role / Timing Role: Noninverting octal buffer with dual OE control isolates address segments during bank switching.

Use Value: 64 mA sink capability drives 10+ TTL loads per output; fast tPHL ensures clean address hold timing during bank transitions.

Use Scenario: Interfacing ISA bus peripherals requiring open-collector handshake signals (IOR#, IOW#).

IC Role / Device Role / Timing Role: Level-translating line driver converting CMOS control logic to 5-V TTL bus voltages.

Use Value: Open-collector outputs enable wired-AND of multiple peripheral ready signals without contention.

Clock Distribution Network

Industrial PLC I/O Expansion

Use Scenario: Distributing system clock to multiple synchronous latch ICs in programmable logic controllers.

IC Role / Device Role / Timing Role: Low-skew buffer section delivering synchronized clock edges to parallel I/O modules.

Use Value: Matched tPHL/tPLH propagation ensures <1 ns skew between outputs-maintaining setup/hold margins.

Use Scenario: Expanding discrete input scanning in DIN-rail mounted PLC backplanes with shared interrupt lines.

IC Role / Device Role / Timing Role: Wired-AND combiner for multiple module fault signals feeding single controller interrupt pin.

Use Value: Dual OE allows dynamic isolation of faulty modules during hot-swap diagnostics without bus disruption.

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 VCC/IOL/tPHL specs.	Requires external pull-ups for HIGH-level signaling; not suitable for wired-AND bus arbitration.	Select when 3-state bus sharing (not wired-AND) is required and inversion is acceptable.
SN74ALS757N	Same pinout/function but ALS-family: lower IOL (24 mA), slower tPHL (3–15 ns), higher power efficiency.	Acceptable in lower-speed (<5 MHz) address buffering where power budget is constrained.	Choose for cost-sensitive, lower-frequency designs where 64 mA drive and sub-6 ns tPHL are not mandatory.

Compared with SN74AS757DWE4, SN74AS240N offers 3-state control instead of open-collector drive-requiring redesign for pull-up networks and eliminating wired-AND capability-while SN74ALS757N trades 2.7× lower drive strength and 2× slower turn-off for 40% lower ICC in static operation.

Availability

SN74AS757DWE4 is available at Aetrix Electronics and suitable for industrial control panels, legacy computing interfaces, and programmable logic controller (PLC) I/O expansion requiring stable component supply across extended product lifecycles.

Supply support for SN74AS757DWE4 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.

SN74AS757DWE4 belongs to TI's Advanced Schottky (AS) logic family, engineered for high-speed, low-noise memory and bus interface applications in commercial-temperature embedded systems.

FAQ

What is the maximum sink current per output of the SN74AS757DWE4?

The SN74AS757DWE4 guarantees a minimum low-level output current (IOL) of 64 mA per open-collector output at VCC = 4.5 V and VOL = 0.55 V. This rating ensures reliable drive of up to 10 standard TTL inputs or 50-Ω terminated transmission lines, making it suitable for dense memory address bus loading scenarios where SN74AS757DWE4 is deployed as a primary address driver.

Does the SN74AS757DWE4 support wired-AND logic implementation?

Yes, the SN74AS757DWE4 supports wired-AND logic because all eight outputs are open-collector. When multiple outputs share a common pull-up resistor, the net bus state is LOW if any output is actively sinking current-enabling hardware-level arbitration, interrupt combining, and bus-ready signaling without external logic. This behavior is intrinsic to SN74AS757DWE4's architecture and confirmed in its absolute maximum ratings and switching characteristics tables.

What is the operating temperature range for the SN74AS757DWE4?

The SN74AS757DWE4 is characterized for operation from 0°C to 70°C, consistent with commercial-grade logic devices. This range is explicitly stated in the "recommended operating conditions" table of the SDAS040B datasheet and applies to all SOIC (DW) packaged variants including SN74AS757DWE4. It is not rated for extended industrial (−40°C to +85°C) or military (−55°C to +125°C) temperature operation.

How does the dual output-enable (1OE and 2OE) function in the SN74AS757DWE4?

The SN74AS757DWE4 features two independent active-low output-enable inputs: 1OE controls outputs 1Y1–1Y4, and 2OE controls outputs 2Y1–2Y4. When either OE is HIGH, its corresponding four outputs enter high-impedance (open-circuit) state; when LOW, outputs actively drive LOW or float HIGH via external pull-up. This allows segmented bus control-e.g., enabling only upper/lower address nibbles-without affecting the other group, a capability directly implemented in SN74AS757DWE4's logic diagram and pinout.

Is the SN74AS757DWE4 pin-compatible with the SN74AS756?

No, SN74AS757DWE4 is not pin-compatible with SN74AS756. While both are 20-pin SOIC octal buffers, SN74AS756 has complementary OE/!OE inputs and inverting outputs, whereas SN74AS757DWE4 uses dual active-low OE inputs and noninverting outputs. Their logic diagrams, pin functions (e.g., pin 19 is 2OE in SN74AS757DWE4 but 2OE in SN74AS756), and truth tables differ fundamentally-making direct substitution impossible without PCB layout and firmware changes to SN74AS757DWE4's interface.

SN74AS757DWE4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74AS

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:: -, 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

SN74AS757DWE4 FAQ

1.How can I place an order for SN74AS757DWE4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74AS757DWE4 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 SN74AS757DWE4 reliable?

The price and inventory of SN74AS757DWE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS757DWE4 is usually 5 days.

3.What payment methods are accepted for SN74AS757DWE4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS757DWE4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74AS757DWE4?

SN74AS757DWE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74AS757DWE4 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 SN74AS757DWE4?

For technical support, including SN74AS757DWE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS757DWE4 requirements.

6.How does Aetrix verify that SN74AS757DWE4 is sourced from the original manufacturer or authorized distributors?

All SN74AS757DWE4 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 SN74AS757DWE4 meets industry standards.

7.What is the process for return or replacement of SN74AS757DWE4?

All SN74AS757DWE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS757DWE4, 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 SN74AS757DWE4 part is unused and in its original packaging.

Return procedure for SN74AS757DWE4:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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