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Texas Instruments SN74ABT533APWLE
- Part No.:
- SN74ABT533APWLE
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ABT533APWLE.pdf
- Description:
- BUS DRIVER, ABT SERIES, 8-BIT
- Quantity:
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Inventory:7,000
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Product details
Overview
SN74ABT533APWLE 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. It features –32-mA IOH / 64-mA IOL drive strength, 5-V supply operation (4.5–5.5 V), and operates from –40°C to 85°C. Its latch-enable (LE) and output-enable (OE) inputs enable precise data latching and bus isolation in bidirectional systems.
For engineers reviewing the SN74ABT533APWLE datasheet, SN74ABT533APWLE pinout, SN74ABT533APWLE application, or SN74ABT533APWLE equivalent, key selection criteria include 3-state bus-driving capability, TTL-compatible input thresholds, propagation delay under 7 ns, latch timing margins (tsu = 2.1 ns, th = 2.1 ns), and TSSOP-20 packaging for space-constrained PCB layouts.
Technical Context
This device implements eight independent inverting D-type latches-each Q output follows the complement of its D input when LE is high, and holds that inverted state when LE goes low. The OE input controls all eight outputs simultaneously, placing them in high-impedance (Z) state without affecting internal latch operation or stored data.
Its EPIC-IIB BiCMOS process delivers high drive while minimizing power dissipation and ground bounce (VOLP < 1 V). Input thresholds meet standard TTL levels (VIH = 2 V, VIL = 0.8 V), and absolute maximum ratings support robust operation up to 7 V on VCC and VI, with latch-up immunity exceeding 500 mA per JESD-17.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and mixed-voltage logic systems. |
| Output Drive | –32 mA IOH / 64 mA IOL - enables direct driving of heavy capacitive loads (e.g., >50 pF buses) without external buffers. |
| Propagation Delay | tPLH/tPHL ≤ 6.4 ns (D→Q), tPLH/tPHL ≤ 7.3 ns (LE→Q) - supports high-speed data capture in 100+ MHz bus environments. |
| Setup/Hold Time | tsu = 2.1 ns, th = 2.1 ns - allows tight timing integration with fast microcontrollers and FPGAs. |
| 3-State Enable Time | tPZH/tPLZ ≤ 6.9 ns - ensures rapid bus release for time-critical arbitration and multiplexing. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and communications equipment. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - guarantees reliable interfacing with legacy TTL and CMOS logic families. |
Pinout & Package
TSSOP-20 package (PW), 6.5 mm × 4.4 mm body, 0.65 mm pitch, 1.2 mm max height - optimized for automated SMT assembly and high-density routing in compact industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | D1–D8 Data Inputs | Inverted latching path: each D input drives complementary Q output when LE is active. |
| 9 | GND | Ground reference for all logic and output stages; must be low-impedance for stable VOLP performance. |
| 10 | VCC | 5-V supply rail; decoupling capacitor required near pin to suppress switching noise. |
| 11–18 | Q1–Q8 Outputs | Inverted latched outputs; tri-stated when OE is high, enabling shared bus topology. |
| 19 | OE | Active-low output enable - asserts high-impedance state independently of LE or stored data. |
| 20 | LE | Latch-enable - rising edge captures D-input states; level-sensitive for transparent operation. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting Latch Architecture | Each Q output is the logical inverse of its D input - simplifies polarity-aware bus inversion without external gates. |
| High-Drive 3-State Outputs | –32 mA/64 mA drive with controlled Z-state leakage (< ±10 µA) - eliminates need for pull-up/down resistors on shared data lines. |
| Low Ground Bounce | VOLP < 1 V at 5 V/25°C - maintains signal integrity during simultaneous output switching in multi-bit buses. |
| Robust ESD Protection | >2000 V HBM, >200 V machine model - withstands handling and board-level electrostatic events in manufacturing and field service. |
| JEDEC Latch-Up Immunity | >500 mA per JESD-17 - prevents destructive latch-up during voltage transients or overvoltage conditions. |
Applications
| Bus Interface Buffer | I/O Port Expander |
|---|---|
Use Scenario: Isolating a microcontroller's parallel data bus from a high-capacitance backplane or peripheral module. IC Role / Device Role / Timing Role: Acts as a direction-controlled, inverting latch buffer with OE-gated 3-state outputs to prevent bus contention during read/write cycles. Use Value: Enables clean bus turn-around using single-cycle OE assertion, eliminating timing gaps required by non-latching drivers. | Use Scenario: Extending GPIO count on an FPGA or ASIC via parallel 8-bit I/O port with local data retention. IC Role / Device Role / Timing Role: Provides edge-triggered input sampling and level-hold output staging, synchronized to system clock via LE control. Use Value: Reduces FPGA pin count and logic utilization by offloading input debouncing and output drive requirements. |
| Bidirectional Data Register | Legacy System Glue Logic |
Use Scenario: Implementing a dual-role register in a shared-memory interface where data flows both to and from a DSP core. IC Role / Device Role / Timing Role: Functions as a transparent latch during write phases (LE high) and a static hold register during read phases (LE low). Use Value: Eliminates need for separate input and output registers, cutting component count and PCB area in memory-mapped peripherals. | Use Scenario: Interfacing modern 5-V microcontrollers with older TTL-based instrumentation subsystems. IC Role / Device Role / Timing Role: Translates between contemporary logic drive strengths and legacy load requirements while preserving signal polarity via inversion. Use Value: Restores timing margin lost due to degraded rise/fall times in aging backplanes, thanks to 64-mA sink capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT573APWR | Non-inverting output logic; identical timing, drive, and package. | Used where output polarity must match input (no inversion); requires no logic inversion in upstream design. | Select when system-level signal flow mandates non-inverted Q = D behavior. |
| SN74LVTH573APWRE4 | Lower voltage operation (2.7–3.6 V), reduced drive (–24 mA/48 mA), LVTH CMOS process. | Suitable for mixed-voltage 3.3-V domains; not interoperable with 5-V buses without level translation. | Choose for power-sensitive 3.3-V systems where full 5-V ABT drive is unnecessary. |
Compared with SN74ABT533APWLE, SN74ABT573APWR offers identical speed and drive but non-inverting functionality-ideal for polarity-critical paths-while SN74LVTH573APWRE4 trades 5-V compatibility and peak drive for lower power and 3.3-V native operation, requiring voltage domain isolation in hybrid designs.
Availability
SN74ABT533APWLE is available at Aetrix Electronics and suitable for industrial control interfaces, legacy bus expansion, and embedded I/O port buffering requiring stable component supply across extended product lifecycles.
Supply support for SN74ABT533APWLE 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 innovation in high-reliability interface and bus technologies.
The SN74ABT533A family was engineered for robust 5-V bus interfacing in industrial and computing systems, emphasizing high drive, noise immunity, and latch-up resilience in electrically harsh environments.
FAQ
What is the function of the LE and OE pins on the SN74ABT533APWLE?
The LE (latch-enable) pin controls data capture: when high, Q outputs follow the inverse of D inputs; when low, Q holds the last inverted D state. OE (output-enable) is active-low and places all eight Q outputs in high-impedance state without affecting internal latch operation or stored data. This separation allows concurrent data loading and bus release - critical for synchronous bus arbitration in the SN74ABT533APWLE.
Does the SN74ABT533APWLE support 3.3-V logic inputs?
No - the SN74ABT533APWLE is a 5-V-only device with TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max). While 3.3-V logic may register as valid high/low under ideal conditions, it violates recommended operating conditions and risks marginal switching, especially across temperature and voltage tolerances. For 3.3-V systems, consider SN74LVTH573APWRE4 instead of SN74ABT533APWLE.
What is the maximum capacitive load the SN74ABT533APWLE can drive reliably?
The SN74ABT533APWLE is characterized with CL = 50 pF in timing tests and supports sustained 64-mA low-level output current. Based on its drive strength and VOLP specification (<1 V), it reliably drives ≥100 pF total bus capacitance in typical PCB layouts - verified by TI's application notes on ABT-series bus loading. For loads exceeding 100 pF, verify signal integrity with IBIS simulation using the official SN74ABT533APWLE model.
Is the SN74ABT533APWLE pin-compatible with other TSSOP-20 octal latches?
Yes - the SN74ABT533APWLE shares identical TSSOP-20 (PW) pinout and footprint with SN74ABT573APWR and SN74LVTH573APWRE4. All three use the same 20-pin arrangement: D1–D8 on pins 1–8, GND on 9, VCC on 10, Q1–Q8 on 11–18, OE on 19, and LE on 20. However, logic polarity (inverting vs. non-inverting) and voltage compatibility differ - physical compatibility does not imply functional drop-in replacement for SN74ABT533APWLE.
How should OE be handled during power-up to avoid bus contention with the SN74ABT533APWLE?
To ensure high-impedance outputs at power-up, OE must be held high (inactive) until VCC stabilizes. TI recommends tying OE to VCC through a pullup resistor; minimum value is determined by the driver's current-sinking capability - typically 4.7 kΩ suffices for most microcontroller or CPLD drivers. This prevents unintended low-impedance output states during brown-out or reset sequences in systems using SN74ABT533APWLE.
SN74ABT533APWLE 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:
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- Qualification:
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- Mounting Type:
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- Supplier Device Package:
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SN74ABT533APWLE FAQ
1.How can I place an order for SN74ABT533APWLE through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT533APWLE on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SN74ABT533APWLE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT533APWLE is usually 5 days.
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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 SN74ABT533APWLE?
For technical support, including SN74ABT533APWLE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT533APWLE requirements.
6.How does Aetrix verify that SN74ABT533APWLE is sourced from the original manufacturer or authorized distributors?
All SN74ABT533APWLE 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 SN74ABT533APWLE meets industry standards.
7.What is the process for return or replacement of SN74ABT533APWLE?
All SN74ABT533APWLE units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT533APWLE, 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 SN74ABT533APWLE part is unused and in its original packaging.
Return procedure for SN74ABT533APWLE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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