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Texas Instruments SN74ALS29827DWRE4
- Part No.:
- SN74ALS29827DWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS29827DWRE4.pdf
- Description:
- IC BUF NON-INVERT 5.25V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,220
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Product details
Overview
SN74ALS29827DWRE4 from Texas Instruments is a 10-bit non-inverting buffer and bus driver with dual 3-state enable (OE1/OE2), designed for high-performance bus interfacing in wide data paths or parity-carrying buses. It operates at 4.75–5.25 V, delivers ±48 mA output drive, features pnp inputs to reduce DC loading, and maintains high-impedance outputs at power-up. It is used in memory address register buffering and system bus isolation.
For engineers reviewing the SN74ALS29827DWRE4 datasheet, SN74ALS29827DWRE4 pinout, SN74ALS29827DWRE4 application, or SN74ALS29827DWRE4 equivalent, key selection criteria include true-output logic polarity, dual-OE 3-state control architecture, ALS family propagation delay (≤15 ns at 300 pF), SOIC-24 thermal and layout compatibility, and industrial temperature range support.
Technical Context
The SN74ALS29827DWRE4 implements a dual-input NOR gate for 3-state control: either OE1 or OE2 high forces all ten Y outputs into high-impedance. Its pnp input structure lowers input current draw versus standard TTL, reducing bus loading. The device belongs to the ALS (Advanced Low-Power Schottky) logic family, optimized for speed–power trade-off in legacy 5-V systems.
It provides true (non-inverted) data translation from A1–A10 to Y1–Y10, with data flow-through pinout-inputs on one side (pins 1–11, 13), outputs on the opposite side (pins 14–24, 12). Power-up high-impedance ensures safe bus initialization without contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky) - balances 15 ns propagation delay with 40 mA typical ICC at 5 V. |
| Supply Voltage | 4.75 V to 5.25 V - compatible with regulated 5-V TTL/LS/ALS systems; absolute max 7 V. |
| Output Drive | IOL = 48 mA / IOH = –24 mA - sufficient to drive heavy capacitive loads (e.g., 300-pF buses) without external buffers. |
| Propagation Delay | tPLH/tPHL ≤ 15 ns @ CL = 300 pF - enables reliable operation in 30+ MHz bus environments. |
| 3-State Enable | Dual OE (OE1, OE2) with NOR logic - any OE high disables all outputs; supports flexible bus arbitration schemes. |
| Input Structure | PnP input transistors - reduces IIH/IIL to ≤20 µA/–0.1 mA, minimizing DC loading on upstream drivers. |
| Operating Temperature | 0°C to 70°C - rated for commercial-grade embedded and industrial control applications. |
Pinout & Package
SN74ALS29827DWRE4 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 floor life), tube packaging (25 pcs).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13 | OE1, OE2 | Active-high 3-state enable inputs; NOR logic - either high forces all Y outputs high-Z. |
| 2–11, 14 | A1–A10 | True data inputs; PNP structure minimizes DC loading on source registers or buses. |
| 15–24, 12 | Y1–Y10, GND | Non-inverting buffered outputs; pin 12 is ground reference for all internal circuitry. |
| 24 | VCC | Positive supply terminal; must be decoupled locally (0.1 µF ceramic) due to ALS switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| True-output 10-bit buffering | Preserves signal polarity from A1–A10 to Y1–Y10 - eliminates need for external inverters in address/data path alignment. |
| Data flow-through pinout | Inputs (left side) and outputs (right side) are physically separated - simplifies PCB routing and reduces crosstalk in dense bus layouts. |
| Power-up high-impedance state | Outputs remain tri-stated until both OE1 and OE2 are actively driven low - prevents bus contention during power sequencing. |
| pnp input stage | Reduces input current to ≤20 µA high-level and –0.1 mA low-level - extends fan-out capability in multi-driver bus topologies. |
| Dual 3-state enable logic | Independent OE1/OE2 with NOR gating - enables hierarchical bus control (e.g., master/slave arbitration or memory vs. I/O select). |
Applications
| Memory Address Buffering | System Bus Isolation |
|---|---|
Use Scenario: Buffering 10-bit CPU address lines driving multiple memory chips with cumulative load >200 pF. IC Role / Device Role / Timing Role: Non-inverting address driver with 15 ns max tPLH/tPHL - ensures setup/hold timing margin across full address decode window. Use Value: Eliminates timing skew between parallel address bits and sustains valid address windows under heavy capacitive loading. | Use Scenario: Isolating two 10-bit data buses sharing a common backplane, controlled by separate microcontroller peripherals. IC Role / Device Role / Timing Role: Bidirectional bus interface with dual OE pins - allows independent enable/disable of each bus segment without hardware reconfiguration. Use Value: Prevents signal contention during peripheral handshaking and enables hot-swap-safe bus partitioning. |
| Parity Bus Extension | Legacy Industrial Controller I/O Expansion |
Use Scenario: Extending 10-bit parity check signals from a UART or DMA controller to remote error-detection logic across a 15-cm PCB run. IC Role / Device Role / Timing Role: Low-skew parity repeater with matched propagation delays across all 10 channels - preserves parity generation timing integrity. Use Value: Maintains <1 ns inter-channel skew, ensuring synchronous parity validation at destination latch. | Use Scenario: Adding 10-bit general-purpose I/O to an aging PLC CPU board using existing 5-V ALS-compatible logic rails. IC Role / Device Role / Timing Role: Drop-in-compatible buffer for AM29827-based designs - supports identical pinout, voltage, and timing specs. Use Value: Enables field-upgrade of I/O capacity without redesigning schematics or layout, leveraging proven ALS timing margins. |
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 |
|---|---|---|---|
| SN74ALS29827N | Same logic function and specs, but in 300-mil PDIP (NT) package - larger footprint, through-hole mounting. | Suitable for prototyping, breadboarding, or legacy through-hole production; lacks SOIC thermal performance and density. | Select when manual assembly, socketing, or thermal mass requirements favor DIP over SOIC. |
| AM29827 | Functionally equivalent per TI documentation; identical pinout, timing, and DC specs - manufactured by AMD (now AMD/Xilinx legacy). | Used in original equipment where AMD-sourced components were specified; may differ in lot traceability and long-term availability. | Choose for direct replacement in AMD-designed systems where cross-qualification is already established. |
Compared with SN74ALS29827N and AM29827, the SN74ALS29827DWRE4 offers surface-mount SOIC-24 packaging for higher board density and automated assembly, while retaining identical electrical behavior and ALS-family timing - making it optimal for volume production of space-constrained industrial controllers.
Availability
SN74ALS29827DWRE4 is available at Aetrix Electronics and suitable for memory address buffering, system bus isolation, and parity bus extension requiring stable component supply and long-lifecycle support in industrial control and legacy computing systems.
Supply support for SN74ALS29827DWRE4 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 heritage in TTL, LS, ALS, and advanced logic families.
The SN74ALS29827DWRE4 belongs to TI's legacy ALS logic portfolio, engineered for high-speed, low-power 5-V bus interfacing in industrial, computing, and communications infrastructure where reliability and timing predictability are critical.
FAQ
What logic family does the SN74ALS29827DWRE4 belong to, and how does it compare to standard TTL?
The SN74ALS29827DWRE4 belongs to the Advanced Low-Power Schottky (ALS) logic family. Compared to standard TTL, it delivers faster propagation delay (≤15 ns vs. ~30 ns), lower power consumption (ICC = 25–40 mA vs. ~50 mA), and reduced input current due to its PNP input structure. These improvements make the SN74ALS29827DWRE4 suitable for high-density, high-speed bus applications where timing and loading matter.
Does the SN74ALS29827DWRE4 support inverted output functionality?
No - the SN74ALS29827DWRE4 provides true (non-inverting) output logic. Its functional counterpart, the SN74ALS29828, provides inverted outputs. The datasheet explicitly distinguishes these two part numbers by output polarity, and the SN74ALS29827DWRE4's logic diagram and truth table confirm direct A-to-Y mapping without inversion.
What is the recommended decoupling strategy for the SN74ALS29827DWRE4?
Each SN74ALS29827DWRE4 should have a 0.1 µF ceramic capacitor placed as close as possible between VCC (pin 24) and GND (pin 12). For boards with multiple devices, add a bulk 4.7 µF–10 µF tantalum or aluminum electrolytic capacitor near the power entry point. This mitigates switching noise from the ALS family's fast edge rates and prevents supply rail collapse during simultaneous 10-bit output transitions.
Can the SN74ALS29827DWRE4 be used in systems operating outside the 0°C to 70°C range?
No - the SN74ALS29827DWRE4 is characterized and guaranteed only for operation from 0°C to 70°C. While absolute maximum ratings allow storage down to –65°C and up to 150°C, functional operation outside the specified temperature range is not assured. For extended temperature applications, consider modern alternatives qualified for –40°C to 85°C or higher.
Is the SN74ALS29827DWRE4 pin-compatible with the AM29827?
Yes - the SN74ALS29827DWRE4 is functionally and pin-compatible with the AMD AM29827, as confirmed in the TI datasheet: "Functionally Equivalent to AMD's AM29827 and AM29828." Both share identical pinout, electrical specifications, timing parameters, and SOIC-24 packaging, enabling direct substitution in legacy designs originally specifying AM29827.
SN74ALS29827DWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
SN74ALS29827DWRE4 FAQ
1.How can I place an order for SN74ALS29827DWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS29827DWRE4 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 SN74ALS29827DWRE4 reliable?
The price and inventory of SN74ALS29827DWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS29827DWRE4 is usually 5 days.
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Once your SN74ALS29827DWRE4 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 SN74ALS29827DWRE4?
For technical support, including SN74ALS29827DWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS29827DWRE4 requirements.
6.How does Aetrix verify that SN74ALS29827DWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74ALS29827DWRE4 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 SN74ALS29827DWRE4 meets industry standards.
7.What is the process for return or replacement of SN74ALS29827DWRE4?
All SN74ALS29827DWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS29827DWRE4, 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 SN74ALS29827DWRE4 part is unused and in its original packaging.
Return procedure for SN74ALS29827DWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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