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Texas Instruments SN74ALS29828DW
- Part No.:
- SN74ALS29828DW
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ALS29828DW.pdf
- Description:
- BUS DRIVER, ALS SERIES
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Inventory:1,213
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Product details
Overview
SN74ALS29828DW from Texas Instruments is a 10-bit inverting bus driver with dual 3-state enable inputs (OE1, OE2), designed for high-performance memory address buffering and wide-data-path bus interfacing in industrial and embedded systems operating from 0°C to 70°C. It features pnp-input structure reducing DC loading, data flow-through pinout, and power-up high-impedance outputs.
For engineers reviewing the SN74ALS29828DW datasheet, SN74ALS29828DW pinout, SN74ALS29828DW application, or SN74ALS29828DW equivalent, key selection criteria include its 5 V operation, ±24 mA/48 mA output drive, 7 ns propagation delay at 50 pF load, 3-state timing performance, and SOIC-24 package compatibility with legacy TTL bus architectures.
Technical Context
This device implements a dual-NOR 3-state control architecture: either OE1 or OE2 high forces all ten Y outputs into high-impedance, enabling shared-bus arbitration. Its inverted logic function (A→Y̅) distinguishes it from the non-inverting SN74ALS29827, while both share identical pinout, timing, and electrical specs.
Designed for ALS (Advanced Low-Power Schottky) TTL compatibility, it operates within 4.75–5.25 V supply range, supports 300 pF capacitive loads, and delivers guaranteed VOL ≤ 0.5 V at IOL = 48 mA and VOH ≥ 2.0 V at IOH = –24 mA - meeting legacy system-level noise margin and fanout requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Inverting 10-bit buffer with dual 3-state enables (OE1/OE2) |
| Supply Voltage | 4.75 V to 5.25 V - compatible with standard 5 V TTL/ALS rails |
| Output Drive | –24 mA (IOH), +48 mA (IOL) - sufficient for driving 10+ TTL loads or 300 pF buses |
| Propagation Delay | 7 ns (tPLH/tPHL, CL = 50 pF) - supports >100 MHz bus toggle rates in low-capacitance layouts |
| 3-State Enable Timing | tPZL/tPHZ = 12 ns (CL = 5 pF) - ensures clean bus release before next driver activation |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade industrial control and computing applications |
| Input Structure | pnp-based inputs - reduces input current loading on upstream drivers by ~90% vs. standard TTL |
Pinout & Package
SN74ALS29828DW uses a 24-pin SOIC (DW) package with 300-mil body width, gull-wing leads, and JEDEC MS-013 compliant footprint. Pin 1 is marked via notch or bevel; pin 12 is GND, pin 13 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13 | OE1, OE2 | Dual active-low 3-state enable inputs - NOR logic: either high disables all outputs |
| 2–11 | A1–A10 | Inverting data inputs - each drives corresponding Y output with polarity inversion |
| 12 | GND | Ground reference for all internal circuitry and output stage return path |
| 13 | VCC | Positive supply rail (4.75–5.25 V) powering internal logic and output drivers |
| 14–23 | Y1–Y10 | Inverted 3-state outputs - high-impedance when OE1 or OE2 is high; otherwise Yn = A̅n |
| 24 | NC | No connect - internally unconnected; must remain floating or grounded per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Data Flow-Through Pinout | All 10 inputs (A1–A10) on left side, all 10 outputs (Y1–Y10) on right side - simplifies PCB routing and minimizes trace crosstalk in dense bus layouts |
| Power-Up High-Impedance State | Outputs default to Hi-Z at power-on - prevents bus contention during system initialization or reset sequences |
| pnp Input Structure | Reduces input current to ≤0.1 mA (II) - lowers loading on preceding drivers and improves signal integrity in cascaded TTL chains |
| Dual 3-State Control | Independent OE1/OE2 pins allow flexible bus arbitration schemes - e.g., one for local subsystem, one for global backplane control |
Applications
| Memory Address Buffering | Industrial Backplane Interface |
|---|---|
Use Scenario: Buffering 10-bit address lines between microprocessor and multiple memory banks in PLC or CNC controller. IC Role / Device Role / Timing Role: Inverting address driver with 3-state isolation - enables dynamic bank selection without address bus contention. Use Value: Guaranteed 7 ns propagation delay and 48 mA sink capability ensure reliable address setup/hold timing across 300 pF routed traces and multiple DRAM chips. | Use Scenario: Isolating and driving parallel control signals across modular I/O chassis backplanes in factory automation systems. IC Role / Device Role / Timing Role: Bus driver with dual enable control - allows hot-swap module insertion while maintaining signal integrity on shared control bus. Use Value: Power-up Hi-Z state and fast 12 ns output disable time prevent glitches during module insertion/removal sequences. |
| Legacy TTL System Upgrade | Parallel Data Path Expansion |
Use Scenario: Replacing obsolete 74LS244/245 in aging test equipment where inverted logic is acceptable or compensated in firmware. IC Role / Device Role / Timing Role: Drop-in-compatible ALS upgrade - same pinout as AM29828, higher speed, lower power than LS family. Use Value: 50% faster propagation (vs. 74LS244) and pnp inputs reduce upstream driver loading - extends life of legacy board designs without redesign. | Use Scenario: Expanding 8-bit data bus to 10-bit parity-carry path in embedded communication protocol handler (e.g., MIL-STD-1553 interface logic). IC Role / Device Role / Timing Role: Parity bit buffer and bus driver - provides matched delay and drive strength for critical timing paths. Use Value: Matched tPLH/tPHL (7 ns) and symmetric output drive ensure deterministic setup/hold margins for parity validation logic downstream. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit inverting bus driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS29827DW | Non-inverting logic function (A→Y); otherwise identical pinout, timing, and drive specs | Used where true (non-inverted) data path required - no logic inversion in signal chain | Select SN74ALS29827DW when system-level logic does not require inversion; SN74ALS29828DW when inversion is needed or already compensated |
| AM29828 (AMD) | Functionally equivalent per TI documentation; identical AC/DC specs and pinout - manufactured by AMD prior to TI acquisition | No functional difference; legacy sourcing only - no new production or support from AMD | Prefer SN74ALS29828DW for active production; AM29828 only for legacy repair or cross-reference verification |
Compared with SN74ALS29827DW and AM29828, the SN74ALS29828DW offers identical timing and drive but delivers inverted outputs - making it optimal for systems where polarity inversion aligns with existing decode logic or simplifies external gate count.
Availability
SN74ALS29828DW is available at Aetrix Electronics and suitable for industrial control systems, legacy test equipment upgrades, and embedded computing platforms requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS29828DW 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 ICs with broad industrial, automotive, and communications portfolio coverage.
The SN74ALS29828DW belongs to TI's legacy Advanced Low-Power Schottky (ALS) logic family, engineered for high-speed, low-power TTL-compatible bus interfacing in commercial-temperature industrial and computing systems.
FAQ
What logic function does the SN74ALS29828DW implement?
The SN74ALS29828DW implements a 10-bit inverting buffer with dual 3-state enable inputs. Each output Yn is the logical inverse of its corresponding input An (Yn = A̅n), and all outputs enter high-impedance when either OE1 or OE2 is driven high. This function is explicitly defined in the TI SDAS095B datasheet and distinguishes it from the non-inverting SN74ALS29827DW.
What is the recommended operating voltage range for the SN74ALS29828DW?
The SN74ALS29828DW is specified for operation from 4.75 V to 5.25 V, with nominal performance at 5 V. This range ensures compatibility with standard 5 V TTL and ALS logic families. Operation outside this range - including absolute maximum rating of 7 V - risks permanent damage or undefined behavior, as confirmed in the absolute maximum ratings table of the official datasheet.
Does the SN74ALS29828DW have a power-up high-impedance feature?
Yes, the SN74ALS29828DW enters a high-impedance state on all outputs at power-up, regardless of OE1/OE2 logic levels. This behavior is documented in the "Features" section of the SDAS095B datasheet and prevents bus contention during system startup or reset. It is implemented via internal power-on reset circuitry and applies specifically to the SN74ALS29828DW and its sibling SN74ALS29827DW.
What package type is used for the SN74ALS29828DW?
The SN74ALS29828DW uses a 24-pin SOIC (DW) package - a surface-mount, 300-mil wide small-outline integrated circuit with gull-wing leads. This package is confirmed in TI's Packaging Information Addendum and matches the pinout diagram labeled "DW OR NT PACKAGE (TOP VIEW)" in the SDAS095B datasheet. No other package variants are assigned to the "DW" suffix.
How does the SN74ALS29828DW differ from the SN74ALS29827DW?
The SN74ALS29828DW and SN74ALS29827DW share identical pinout, timing, drive strength, and 3-state control architecture, but differ exclusively in logic polarity: SN74ALS29828DW provides inverted outputs (Y = A̅), while SN74ALS29827DW provides true outputs (Y = A). This functional distinction is stated in the device description and logic symbol sections of the SDAS095B datasheet and is the sole differentiating specification between the two part numbers.
SN74ALS29828DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74ALS29828DW FAQ
1.How can I place an order for SN74ALS29828DW through Aetrix?
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5.How can I obtain technical support or documentation for SN74ALS29828DW?
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6.How does Aetrix verify that SN74ALS29828DW is sourced from the original manufacturer or authorized distributors?
All SN74ALS29828DW 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 SN74ALS29828DW meets industry standards.
7.What is the process for return or replacement of SN74ALS29828DW?
All SN74ALS29828DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS29828DW, 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 SN74ALS29828DW part is unused and in its original packaging.
Return procedure for SN74ALS29828DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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