Texas Instruments SN74AS763DW

Overview

SN74AS763DW from Texas Instruments is an octal buffer/line driver with complementary G and G̅ inputs, designed for bus-oriented memory address driving and clock distribution. It features open-collector outputs capable of sinking up to 64 mA, operates at 4.5–5.5 V supply, and is rated for 0°C to 70°C industrial temperature range.

For engineers reviewing the SN74AS763DW datasheet, SN74AS763DW pinout, SN74AS763DW application, or SN74AS763DW equivalent, this page delivers verified electrical specs, true pin mapping, real-world use cases in memory and bus systems, and two confirmed alternative parts with documented functional and parametric differences.

Technical Context

The SN74AS763DW implements dual 4-bit noninverting buffer architecture with separate active-low enable inputs (1G and 2G) controlling independent output groups. Each group contains four open-collector outputs driven by corresponding A-inputs, with G/G̅ logic enabling simultaneous or staggered activation.

It uses advanced Schottky (AS) bipolar technology for high-speed operation: tPHL as low as 1 ns and tPLH up to 20 ns under 50-pF load and 500-Ω pull-up. Its IOL = 64 mA rating supports direct drive of TTL loads and termination-resistor networks without external buffers.

Key Specifications

Pinout & Package

SN74AS763DW is housed in a 20-pin SOIC (DW) package with 0.300-inch body width and standard JEDEC MS-013 outline. Pin spacing is 0.050 inch (1.27 mm), compatible with automated SMT assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal open-collector buffer applications.

Compared with SN74AS763DW, SN74ALS763DW trades 2.7× less drive strength and ~30% higher propagation delay for 65% lower quiescent current, while SN74F763N matches drive performance but increases power draw by 15% and requires PCB redesign for DIP mounting.

Availability

SN74AS763DW is available at Aetrix Electronics and suitable for memory address buffering, industrial I/O expansion, clock distribution networks, and bus transceiver interfaces requiring stable component supply and long-term obsolescence mitigation.

Supply support for SN74AS763DW 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 across industrial, automotive, and communications markets.

The SN74AS763DW belongs to TI's AS-series advanced Schottky logic family, engineered for high-speed, high-drive digital interfacing in memory, bus, and clock subsystems where timing precision and load-driving capability are critical.

FAQ

What is the maximum output sink current specification for SN74AS763DW?

The SN74AS763DW is rated for a guaranteed minimum output sink current (IOL) of 48 mA and a maximum of 64 mA under recommended operating conditions (VCC = 4.5 V to 5.5 V). This value is measured at VOL ≤ 0.55 V and supports robust drive into TTL loads or terminated transmission lines. The 64-mA rating appears in the electrical characteristics table for SN74AS763 under IOL test condition with VCC = 4.5 V and IOL = 64 mA.

Does SN74AS763DW support 3.3-V input logic levels?

SN74AS763DW does not guarantee reliable recognition of 3.3-V logic-high inputs. Its VIH (minimum high-level input voltage) is specified as 2.0 V, and it is designed for 5-V TTL-compatible signaling. While a 3.3-V signal may often register as HIGH due to margin, TI's datasheet defines no guaranteed switching threshold below 2.0 V, and operation outside the 4.5–5.5 V VCC range voids specifications. For mixed-voltage systems, level-shifting circuitry is required before the SN74AS763DW inputs.

What is the function of the 2G/2G̅ terminals on SN74AS763DW?

On SN74AS763DW, pin 19 is labeled "2G/2G̅" to indicate it carries the active-low enable signal for the second output group (2Y1–2Y4), and the internal complement (2G̅) is made available for synchronous control of associated logic. Unlike SN74AS762, which has true/complementary outputs, SN74AS763DW uses complementary enable inputs to coordinate dual-group activation without external inversion-enabling precise timing alignment between both sets of outputs.

Can SN74AS763DW replace SN74AS762DW in an existing design?

No-SN74AS763DW is not a drop-in replacement for SN74AS762DW. Although both are octal buffers in DW packages, SN74AS762DW features true and complementary outputs (Y and Y̅), whereas SN74AS763DW provides only noninverting outputs with complementary G/G̅ enables. Their pinouts differ: SN74AS762DW dedicates pins to Y̅ outputs, while SN74AS763DW uses those pins for additional A inputs and G̅ logic. Board-level redesign is required to substitute one for the other.

What package type does SN74AS763DW use, and is it RoHS-compliant?

SN74AS763DW uses a 20-pin plastic small-outline integrated circuit (SOIC) package designated "DW" per TI's packaging nomenclature, with 300-mil body width and standard gull-wing leads. While the original TI datasheet predates RoHS (1986), Rochester Electronics-the current manufacturer-certifies its rebuilt SN74AS763DW to meet RoHS Directive 2011/65/EU and provides material declarations upon request. Aetrix Electronics supplies only RoHS-compliant units with full traceability.