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Texas Instruments SN74ALS29827DWG4
- Part No.:
- SN74ALS29827DWG4
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS29827DWG4.pdf
- Description:
- IC BUF NON-INVERT 5.25V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,663
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Product details
Overview
SN74ALS29827DWG4 from Texas Instruments is a 10-bit non-inverting buffer/bus driver with dual 3-state enable inputs (OE1, OE2), designed for high-performance bus interfacing in wide data paths and memory address register buffering. It operates at 4.75–5.25 V, delivers ±48 mA output drive, features pnp input structure to reduce DC loading, and maintains high-impedance state at power-up. It is used in industrial control backplanes and legacy TTL-compatible memory subsystems.
For engineers reviewing the SN74ALS29827DWG4 datasheet, SN74ALS29827DWG4 pinout, SN74ALS29827DWG4 application, or SN74ALS29827DWG4 equivalent, key selection criteria include its true-output logic, 24-pin SOIC (DW) package, 0°C to 70°C temperature range, 15 ns propagation delay (CL = 300 pF), and dual-NOR 3-state control architecture.
Technical Context
The SN74ALS29827DWG4 implements a dual-gated 3-state output control using a 2-input NOR gate per enable input - either OE1 or OE2 high forces all ten Y outputs into high-impedance. Its pnp-based input stage minimizes DC current draw on driving sources, critical in dense TTL bus environments.
It provides true (non-inverted) data translation across all ten channels (A1–A10 → Y1–Y10), with data flow-through pinout: all inputs on one side (pins 1–11, excluding GND/VCC), all outputs on the opposite side (pins 13–24, excluding VCC/GND). This layout simplifies PCB routing in parallel bus architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 10-bit non-inverting buffer with dual 3-state enable (OE1/OE2) |
| Supply Voltage | 4.75 V to 5.25 V - compatible with standard 5 V TTL systems |
| Output Drive | –24 mA (IOH), +48 mA (IOL) - sufficient to drive 20+ TTL loads or 50 Ω transmission lines |
| Propagation Delay | 15 ns max (A→Y, CL = 300 pF) - supports ≤33 MHz bus operation in typical layouts |
| Enable/Disable Time | 20 ns tPZH / 23 ns tPZL (CL = 300 pF) - ensures clean bus arbitration during hot-swap or dynamic enable sequencing |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade industrial control and computing equipment |
| Input Structure | pnp input stage - reduces input current to ≤0.1 mA, lowering fanout burden on upstream drivers |
Pinout & Package
SN74ALS29827DWG4 is housed in a 24-pin SOIC (DW) package, 300-mil width, with gull-wing leads and RoHS-compliant NiPdAu finish (MSL Level-1, unlimited reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13 | OE1, OE2 | Dual active-high 3-state enable inputs - NOR logic: either high disables all outputs |
| 2–11 | A1–A10 | True data inputs - pnp-coupled for low DC loading on source buses |
| 14–23 | Y1–Y10 | Non-inverting buffered outputs - capable of sourcing/sinking up to 48 mA each |
| 12 | GND | Ground reference - shared return for all I/O and internal logic |
| 24 | VCC | Positive supply - must be decoupled locally (0.1 µF ceramic + 10 µF tantalum) |
Key Features
| Feature | Design Value |
|---|---|
| Data flow-through pinout | Inputs (A1–A10, OE1/OE2) on left side, outputs (Y1–Y10) on right side - enables straight-layer PCB trace routing without layer jumps |
| Power-up high-impedance state | Outputs remain in 3-state until both OE1 and OE2 are actively driven low - prevents bus contention during system reset or power ramp |
| pnp input structure | Reduces input current to ≤0.1 mA at VI = 5.5 V - allows direct interface with older 74LS/74ALS drivers without level-shifting |
| Dual independent enable control | OE1 and OE2 provide redundant or partitioned bus control - supports split-bus architectures or fault-isolation schemes |
Applications
| Memory Address Buffering | Industrial Backplane Interface |
|---|---|
Use Scenario: Buffering 10-bit address lines between microprocessor and static RAM or EPROM in legacy industrial controllers. IC Role / Device Role / Timing Role: Non-inverting address latch driver with 3-state isolation during DMA cycles or peripheral access. Use Value: Ensures signal integrity across 15 cm backplane traces while preventing address bus contention during memory refresh or interrupt servicing. | Use Scenario: Interfacing multiple 8-bit microcontrollers to a shared 10-bit I/O expansion bus in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Bus transceiver enabling bidirectional but time-multiplexed data transfer via OE-controlled direction gating. Use Value: Eliminates need for discrete bus switches; dual OE inputs allow synchronized enable/disable across multiple SN74ALS29827DWG4 devices on same bus segment. |
| Legacy TTL System Upgrade | Test Equipment Signal Conditioning |
Use Scenario: Replacing obsolete 74ALS244 or 74ALS240 buffers in aging test fixtures requiring higher drive strength and tighter timing. IC Role / Device Role / Timing Role: Drop-in-compatible 10-bit buffer with identical pinout family alignment and improved VOL/VOL specs. Use Value: Maintains existing PCB layout while improving noise margin (VOL = 0.35 V max) and reducing ground bounce through controlled edge rates. | Use Scenario: Driving calibrated 50 Ω coaxial cables from digital pattern generators in automated test equipment (ATE). IC Role / Device Role / Timing Role: Impedance-matched output driver with fast enable/disable (tPZL = 23 ns) for precise signal gating. Use Value: Enables sub-25 ns pulse blanking windows and eliminates reflections on 1 m cables due to +48 mA sink capability and low output capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit non-inverting bus driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS244N | Octal (8-bit), not 10-bit; single OE; no dual-enable NOR logic | Lacks Y9/Y10 outputs and independent OE2 control - requires two devices for full 10-bit coverage | Select only if board space permits dual 8-bit packages and system does not require simultaneous 10-bit enable coordination. |
| AM29827 (AMD) | Functionally equivalent per TI datasheet; identical pinout, timing, and electrical specs | No functional difference - historically sourced as second-source part for military/aerospace programs | Choose when dual-sourcing compliance or long-term obsolescence mitigation is required; same footprint and qualification level. |
Compared with SN74ALS29827DWG4, SN74ALS244N requires additional components to achieve 10-bit coverage and lacks coordinated dual-enable control, while AM29827 offers identical functionality with certified second-source pedigree - making it ideal for programs requiring vendor diversification without design change.
Availability
SN74ALS29827DWG4 is available at Aetrix Electronics and suitable for industrial control backplanes, legacy memory subsystems, and test equipment signal conditioning requiring stable component supply and long-lifecycle support.
Supply support for SN74ALS29827DWG4 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ALS29827DWG4 belongs to TI's legacy ALS (Advanced Low-Power Schottky) logic family, engineered for high-speed, low-power TTL-compatible bus interfacing in mission-critical industrial and computing systems.
FAQ
What logic family does the SN74ALS29827DWG4 belong to, and how does it differ from standard TTL?
The SN74ALS29827DWG4 belongs to Texas Instruments' Advanced Low-Power Schottky (ALS) logic family. Unlike standard TTL, ALS uses Schottky-clamped transistors to reduce propagation delay and power consumption simultaneously - achieving 15 ns max tPLH at 40 mA drive while drawing only 25–40 mA ICC. Its pnp input structure further lowers input current versus 74LS, making it ideal for high-fanout bus designs where loading matters.
Does the SN74ALS29827DWG4 support hot insertion or live bus swapping?
The SN74ALS29827DWG4 supports controlled hot insertion when OE1 and OE2 are held high (disabled) before power application - its power-up high-impedance state prevents bus contention. However, it lacks built-in bus-hold or Ioff protection, so external series resistors or hot-swap controllers are recommended for frequent live insertion into powered backplanes.
Can SN74ALS29827DWG4 replace SN74ALS244 in an existing design?
SN74ALS29827DWG4 cannot directly replace SN74ALS244 due to differing pin count (24 vs. 20), channel count (10 vs. 8), and enable architecture (dual OE vs. single OE). While both are ALS-family non-inverting buffers, substituting requires PCB modification to accommodate extra pins and updated enable logic - though its superior drive strength and timing may justify redesign in high-reliability upgrades.
What is the maximum capacitive load the SN74ALS29827DWG4 can drive while maintaining specified timing?
The SN74ALS29827DWG4 is characterized for CL = 50 pF and CL = 300 pF loads. At 300 pF, tPLH/tPHL is guaranteed ≤15 ns. Driving >300 pF increases delay nonlinearly and risks overshoot; for >500 pF loads, use series termination or buffer staging. The device's 48 mA sink capability helps maintain edge integrity, but layout parasitics dominate beyond 300 pF.
Is SN74ALS29827DWG4 RoHS compliant and what is its moisture sensitivity level?
Yes, SN74ALS29827DWG4 is RoHS compliant (lead-free NiPdAu finish) and rated MSL Level-1 (unlimited floor life, peak reflow ≤260°C). It ships in tube packaging (25 units/tube) and requires no baking prior to assembly - consistent with TI's DW-package standard for commercial-temperature logic devices.
SN74ALS29827DWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 10
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 48mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN74ALS29827DWG4 FAQ
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For technical support, including SN74ALS29827DWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS29827DWG4 requirements.
6.How does Aetrix verify that SN74ALS29827DWG4 is sourced from the original manufacturer or authorized distributors?
All SN74ALS29827DWG4 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 SN74ALS29827DWG4 meets industry standards.
7.What is the process for return or replacement of SN74ALS29827DWG4?
All SN74ALS29827DWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS29827DWG4, 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 SN74ALS29827DWG4 part is unused and in its original packaging.
Return procedure for SN74ALS29827DWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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