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Texas Instruments SN74ABT533N
- Part No.:
- SN74ABT533N
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ABT533N.pdf
- Description:
- BUS DRIVER, ABT SERIES, 8-BIT
- Quantity:
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Inventory:3,040
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Product details
Overview
SN74ABT533N from Texas Instruments is an octal transparent D-type latch with 3-state outputs, designed for high-capacitance bus driving and I/O port buffering in 5-V TTL-compatible systems. It features high-drive outputs (–32 mA IOH, 64 mA IOL), latch-enable (LE) and output-enable (OE) control, and operates across –40°C to 85°C. Its primary circuit role is bidirectional data latching and bus isolation in memory interfaces and peripheral controllers.
For engineers reviewing the SN74ABT533N datasheet, SN74ABT533N pinout, SN74ABT533N application, or SN74ABT533N equivalent, key selection considerations include its 20-pin PDIP package, 3.3 ns minimum LE pulse width, 2.1 ns data setup time, and compatibility with legacy 5-V TTL logic families in industrial control and test equipment designs.
Technical Context
This device implements eight independent D-type latches with inverted Q outputs (Q = NOT D when LE is high), enabling transparent data flow followed by edge-triggered latching on LE falling edge. Each latch includes a dedicated D input and Q output, with shared LE and OE controls governing latching and 3-state output behavior respectively.
The BiCMOS EPIC-IIB process delivers low ground bounce (VOLP < 1 V), latch-up immunity >500 mA per JESD-17, and ESD protection >2000 V (MIL-STD-883). Output drive strength and fast propagation delays (tPLH/tPHL ≤ 6.9 ns at CL = 50 pF) support reliable operation on heavily loaded backplanes and legacy bus architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures robust operation under noisy 5-V rail conditions without undervoltage lockout or overvoltage stress. |
| Output Drive | –32 mA IOH / 64 mA IOL - enables direct driving of multiple TTL loads or long PCB traces without external buffers. |
| Propagation Delay | tPLH/tPHL ≤ 6.9 ns (CL = 50 pF) - supports synchronous timing margins in sub-100 MHz bus systems. |
| Setup/Hold Time | tsu = 2.1 ns, th = 2.1 ns - allows tight integration with fast microcontroller GPIO or FPGA I/O without added wait states. |
| 3-State Enable Delay | tPZH/tPLZ ≤ 6.9 ns - guarantees clean bus release/activation during dynamic bus arbitration cycles. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems including programmable logic controllers and instrumentation. |
| Input Clamp Current | –18 mA - protects against transient overvoltage events on data or control lines without external TVS diodes. |
Pinout & Package
SN74ABT533N uses a 20-pin plastic dual in-line package (PDIP-N), 0.3-inch body width, with standard through-hole mounting and JEDEC MS-001AC footprint compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low control: drives all eight Q outputs into high-impedance state when high; no effect on internal latch state. |
| 2–9 | 1D–8D | Data inputs for latches 1 through 8; each directly controls corresponding inverted Q output when LE is high. |
| 10 | GND | Power return reference for all logic and output stages; must be low-inductance connection to minimize ground bounce. |
| 11 | VCC | +5 V supply for internal logic and output drivers; requires local 0.1 µF ceramic decoupling adjacent to pin. |
| 12–19 | 1Q–8Q | Inverted latch outputs (Q = NOT D); tri-stated when OE is high; valid only after LE falling edge completes latching. |
| 20 | LE (Latch Enable) | Active-high transparent mode control: Q follows NOT D while LE = high; latches current D state on LE falling edge. |
Key Features
| Feature | Design Value |
|---|---|
| High-Drive Outputs | –32 mA source / 64 mA sink capability eliminates need for external bus drivers in 5-V TTL systems. |
| Low Ground Bounce | VOLP < 1 V at VCC = 5 V ensures signal integrity on shared ground planes with mixed-signal components. |
| Latch-Up Immunity | Exceeds 500 mA per JESD-17 - prevents destructive latch-up during hot-insertion or ESD transients. |
| ESD Protection | ≥2000 V HBM and ≥200 V machine model - reduces risk of field failure in handling and assembly environments. |
| BiCMOS Process | EPIC-IIB architecture achieves 30% lower power vs. bipolar-only equivalents while maintaining TTL speed. |
Applications
| Industrial PLC I/O Modules | Legacy Bus Interface Adapters |
|---|---|
|
Use Scenario: Isolating and latching digital sensor inputs (e.g., limit switches, encoder signals) in modular PLC backplanes with shared 5-V TTL buses. IC Role / Device Role / Timing Role: Acts as input register: captures asynchronous sensor edges via LE strobe, holds stable values for CPU read, and disables outputs during bus contention using OE. Use Value: Eliminates need for discrete pull-ups or level shifters while supporting hot-swap-safe 3-state control during module insertion/removal. |
Use Scenario: Bridging modern microcontrollers to legacy ISA or VMEbus peripherals requiring octal latched data paths with 3-state bus control. IC Role / Device Role / Timing Role: Serves as bidirectional data buffer: transparently passes CPU writes to peripheral registers, latches reads from peripheral status/data ports, and isolates bus during idle cycles. Use Value: Matches timing requirements of 8-MHz ISA bus (setup/hold >2 ns, delay <7 ns) without adding clock-domain synchronization logic. |
| Test Equipment Signal Conditioning | Digital Logic Analyzer Front-End |
|
Use Scenario: Capturing parallel digital waveforms from DUTs under test using synchronized sampling clocks in benchtop ATE systems. IC Role / Device Role / Timing Role: Functions as acquisition latch: LE aligned to sample clock edge freezes 8-bit parallel data stream; OE enables multiplexed readout to ADC or FPGA controller. Use Value: Provides deterministic capture window (3.3 ns min LE pulse) and noise-immune 64-mA drive into 50-Ω scope inputs or FPGA I/O banks. |
Use Scenario: Buffering and conditioning 8-bit parallel data channels from probe pods before serialization or storage in logic analyzer memory. IC Role / Device Role / Timing Role: Performs channel registration: holds sampled data stable during variable-depth FIFO write cycles; OE gates output to prevent bus contention during memory access conflicts. Use Value: Delivers consistent VOL/VOLP performance (<0.55 V / <1 V) critical for accurate threshold detection in high-speed digital capture circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT533N | AC-family CMOS: 4.5–5.5 V supply, ±24 mA drive, higher noise margin (VIH = 3.5 V), slower tPLH (7.5 ns typical). | Better noise immunity in electrically noisy industrial cabinets but less suitable for driving long traces or heavy capacitive loads. | Select when system prioritizes noise rejection over raw drive strength and speed. |
| SN74LS573N | LS-TTL family: 4.75–5.25 V, ±24 mA drive, higher ICC (30 mA active), no 3-state OE - outputs always enabled. | Requires external bus transceivers for bidirectional use; unsuitable for shared-bus arbitration without additional logic. | Choose only for fixed-direction, non-multiplexed bus extensions where OE functionality is unnecessary. |
Compared with SN74ACT533N and SN74LS573N, the SN74ABT533N uniquely balances high-current drive, fast 3-state switching, and BiCMOS power efficiency-making it optimal for legacy 5-V bus systems requiring both latching and dynamic bus control without added components.
Availability
SN74ABT533N is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy bus interface adapters, test equipment signal conditioning, digital logic analyzer front-ends, and embedded controller expansion subsystems requiring stable component supply across extended product lifecycles.
Supply support for SN74ABT533N 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 for industrial, automotive, and communications markets.
The ABT logic family-including SN74ABT533N-is engineered for high-speed, high-drive 5-V TTL-compatible applications where bus loading, ground bounce, and latch-up immunity are critical design constraints.
FAQ
What is the maximum capacitive load the SN74ABT533N can drive reliably?
The SN74ABT533N is characterized for CL = 50 pF in timing tests, and its 64-mA IOL rating supports driving up to 1000 pF with acceptable rise/fall times in point-to-point configurations. For distributed bus loads exceeding 200 pF, layout optimization (short traces, ground plane) and verification against VOL/VOLP limits at worst-case temperature and voltage is recommended. The SN74ABT533N datasheet specifies performance under 50-pF conditions, not absolute maximum capacitance.
Does the SN74ABT533N support hot-swap operation on a live 5-V bus?
The SN74ABT533N provides inherent hot-swap resilience due to its high latch-up immunity (>500 mA per JESD-17) and robust ESD protection (≥2000 V HBM). However, OE must be held high (via pull-up to VCC) during power-up to ensure outputs remain in high-impedance state until firmware initializes control lines. The SN74ABT533N does not include internal power sequencing logic, so external RC-based OE delay or supervisor ICs are recommended for fully autonomous hot-swap compliance.
Can the SN74ABT533N be used with 3.3-V microcontrollers?
No-the SN74ABT533N is strictly a 5-V device with VIH = 2.0 V minimum and VIL = 0.8 V maximum, making it incompatible with 3.3-V logic levels without level translation. Driving its D or LE inputs directly from a 3.3-V MCU risks marginal high-level recognition and increased static power consumption. The SN74ABT533N requires 5-V supply and 5-V-compatible input sources; use SN74LVC533A for true 3.3-V operation.
What is the purpose of the inverted Q outputs in the SN74ABT533N?
The SN74ABT533N outputs the logical complement of D inputs (Q = NOT D) when LE is high-this inversion is intrinsic to its internal gate structure and cannot be disabled. This behavior is leveraged in applications like address/data bus inversion, parity generation, or complementary signal routing. The SN74ABT533N's function table explicitly defines Q = NOT D during transparent mode, and users must account for this inversion in system-level logic design.
How does the SN74ABT533N differ from the SN74ABT533A variant?
The SN74ABT533N is the PDIP-packaged version of the SN74ABT533A, sharing identical electrical specifications, timing parameters, and functional behavior. The "N" suffix denotes plastic DIP packaging (20-pin, 0.3-inch width), while "A" indicates the commercial temperature grade (–40°C to +85°C). All SN74ABT533A variants-including SN74ABT533N-meet the same AC/DC specs; the N package is preferred for prototyping, through-hole assembly, and legacy board compatibility.
SN74ABT533N 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:
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- Input Type:
- -
- Output Type:
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- Current - Output High, Low:
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- Voltage - Supply:
- -
- Operating Temperature:
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SN74ABT533N FAQ
1.How can I place an order for SN74ABT533N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT533N 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 SN74ABT533N reliable?
The price and inventory of SN74ABT533N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT533N is usually 5 days.
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Once your SN74ABT533N 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 SN74ABT533N?
For technical support, including SN74ABT533N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT533N requirements.
6.How does Aetrix verify that SN74ABT533N is sourced from the original manufacturer or authorized distributors?
All SN74ABT533N 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 SN74ABT533N meets industry standards.
7.What is the process for return or replacement of SN74ABT533N?
All SN74ABT533N units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT533N, 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 SN74ABT533N part is unused and in its original packaging.
Return procedure for SN74ABT533N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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