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Texas Instruments SN74ABT534ADB
- Part No.:
- SN74ABT534ADB
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
SN74ABT534ADB.pdf
- Description:
- BUS DRIVER, ABT SERIES, 8-BIT
- Quantity:
- Payment:
- Shipping:
Inventory:8,820
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Product details
Overview
SN74ABT534ADB from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for high-capacitance bus driving in industrial and embedded systems. It features complementary Q̅ outputs, 5-V TTL-compatible operation (4.5–5.5 V), –32-mA/64-mA output drive, 125-MHz max clock frequency, and operates from –40°C to 85°C.
For engineers reviewing the SN74ABT534ADB datasheet, SN74ABT534ADB pinout, SN74ABT534ADB application, or SN74ABT534ADB equivalent, key selection criteria include its inverted-output architecture, high-drive 3-state capability, EPIC-IIB BiCMOS process for low power and latch-up immunity (>500 mA), and compatibility with legacy TTL bus interfaces.
Technical Context
This device implements eight independent D-type flip-flops, each triggered on the positive clock edge to load the complement (Q̅) of the D-input state. The buffered OE input controls all eight outputs simultaneously into high-impedance without affecting internal storage - enabling transparent data retention during bus contention or hot-swap scenarios.
Its EPIC-IIB BiCMOS design delivers TTL-level input thresholds (VIL = 0.8 V, VIH = 2.0 V), fast timing (tsu = 1.6 ns, th = 2.0 ns), and robust noise immunity with typical ground bounce <1 V at VCC = 5 V. Output enable/disable propagation delays range from 1.0 ns (tPZL) to 6.6 ns (tPHZ) under 50-pF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal D-type flip-flop with inverted Q̅ outputs and 3-state control |
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and mixed-voltage bus systems |
| Output Drive | –32 mA (IOH), 64 mA (IOL) - enables direct driving of heavy capacitive loads (e.g., >50 pF buses) without external buffers |
| Max Clock Frequency | 125 MHz - supports high-speed synchronous data latching in backplane and memory interface applications |
| Propagation Delay | tPLH/tPHL ≤ 7.9 ns (CLK to Q) - guarantees tight timing margins in pipeline-critical designs |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade reliability in non-military embedded environments |
| Input Compatibility | TTL-level inputs (VIL ≤ 0.8 V, VIH ≥ 2.0 V) - interoperable with legacy 74-series and microcontroller GPIOs |
Pinout & Package
SN74ABT534ADB uses a 20-pin Shrink Small-Outline Package (SSOP, DB), 0.65-mm pitch, body size 7.2 × 5.3 mm. Pin numbering follows JEDEC MS-012 standard with exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low control for simultaneous 3-state output disable; does not affect internal flip-flop state |
| 2–9, 11–18 | D1–D8, Q1̅–Q8̅ | Data inputs and complemented outputs; D1/Q1̅ through D8/Q8̅ arranged in interleaved order per datasheet top view |
| 10 | GND | Ground reference for logic and output stages; requires low-inductance connection for noise control |
| 19 | CLK | Single global clock input triggering all eight flip-flops on rising edge |
| 20 | VCC | 5-V supply rail; decoupling capacitor (0.1 µF) required near pin for stable high-speed switching |
Key Features
| Feature | Design Value |
|---|---|
| EPIC-IIB BiCMOS Process | Reduces static current vs. bipolar-only logic while maintaining TTL drive strength and speed |
| Latch-Up Immunity | Exceeds 500 mA per JESD-17 - prevents destructive latch-up during transient overvoltage events |
| Output Ground Bounce | Typical VOLP < 1 V at VCC = 5 V - minimizes signal integrity degradation during simultaneous output switching |
| ESD Protection | ≥2000 V HBM (MIL-STD-883), ≥200 V machine model - enhances handling robustness in manufacturing and field service |
| Bus-Friendly 3-State | Outputs fully isolate from bus when disabled (IOZH/IOZL ≤ ±10 µA) - eliminates need for pull-ups or series resistors |
Applications
| Industrial Backplane Interface | Legacy Microcontroller I/O Expansion |
|---|---|
|
Use Scenario: Interfacing a 16-bit microcontroller with a parallel address/data bus requiring level translation and load isolation. IC Role / Device Role / Timing Role: Acts as a buffered, clock-synchronized latch for bidirectional data transfer, using OE to manage bus ownership between master and peripheral. Use Value: High-drive outputs eliminate external bus transceivers; inverted outputs simplify address decoding logic in fixed-function controllers. |
Use Scenario: Expanding GPIO count on an 8051-family MCU with strict timing constraints and limited PCB area. IC Role / Device Role / Timing Role: Provides synchronized, edge-triggered register storage for peripheral control signals, with OE enabling dynamic reconfiguration of I/O direction. Use Value: 1.6-ns setup time and 125-MHz clock support allow integration into high-frequency polling loops without timing penalties. |
| Memory-Mapped Peripheral Latching | Test Equipment Signal Conditioning |
|
Use Scenario: Capturing status flags from multiple sensors into a shared memory-mapped register bank accessed by a DSP. IC Role / Device Role / Timing Role: Functions as a synchronized input latch, capturing sensor states on CLK edge and presenting them via 3-state outputs to the DSP data bus. Use Value: Complementary Q̅ outputs directly feed active-low enable lines in memory decode logic, reducing external gate count. |
Use Scenario: Isolating and conditioning digital stimulus signals in automated test equipment where channel crosstalk must be minimized. IC Role / Device Role / Timing Role: Serves as a gated, clock-aligned buffer stage with precise enable/disable timing to prevent signal glitches during test vector transitions. Use Value: Sub-5-ns OE-to-output delays (tPZL, tPHZ) ensure deterministic signal assertion/retraction aligned to system clock edges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop with 3-state output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT574ADBR | Inverting outputs replaced with true (non-inverted) Q outputs; identical timing, drive, and package | Requires logic inversion in downstream decode circuitry if Q̅ functionality is needed | Select when system design relies on true-Q outputs and avoids added inverters |
| SN74ACT534DBR | ACT family: CMOS input structure (higher VIH/VIL thresholds), lower ICC (15 µA vs. 250 µA), same 3-state drive | Not TTL-input compatible; requires ≥3.5 V VIH, unsuitable for 5-V TTL bus interfacing | Select only in pure CMOS systems where input threshold compatibility is verified |
Compared with SN74ABT534ADB, SN74ABT574ADBR offers functional equivalence except for output polarity, enabling drop-in replacement where Q̅ is not required; SN74ACT534DBR trades TTL input compatibility for lower static power but cannot interface directly with legacy TTL sources.
Availability
SN74ABT534ADB is available at Aetrix Electronics and suitable for industrial backplane interfaces, microcontroller I/O expansion, memory-mapped peripheral latching, and test equipment signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for SN74ABT534ADB 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 leader specializing in analog, embedded processing, and logic solutions, with decades of heritage in standard logic innovation.
The SN74ABT534ADB belongs to TI's ABT advanced BiCMOS logic family, engineered for high-speed, high-drive 5-V bus interface applications where TTL compatibility, noise immunity, and latch-up robustness are critical.
FAQ
What is the output polarity configuration of the SN74ABT534ADB?
The SN74ABT534ADB provides complemented (inverted) Q̅ outputs - on the rising edge of CLK, each Q̅ output assumes the logical inverse of its corresponding D input. This architecture simplifies negative-logic decoding in address/data bus systems and reduces external gate count in fixed-function controllers.
Does the SN74ABT534ADB support hot insertion or live bus swapping?
Yes - the SN74ABT534ADB supports controlled hot insertion via its OE pin: tying OE to VCC through a pullup resistor ensures outputs remain in high-impedance during power-up/down sequences. Its latch-up immunity (>500 mA) and ESD protection (≥2000 V HBM) further enhance robustness in field-replaceable module applications.
Can the SN74ABT534ADB operate reliably at 5.5 V supply?
Yes - the SN74ABT534ADB is rated for VCC up to 5.5 V per absolute maximum ratings, and all recommended operating conditions (including timing and drive specs) are guaranteed across 4.5 V to 5.5 V. Operation at 5.5 V increases output drive margin but slightly raises ICC; thermal design must account for θJA = 115°C/W in DB package.
What is the minimum recommended pullup resistor value for OE on the SN74ABT534ADB?
The minimum OE pullup resistor value depends on the current-sinking capability of the driving source. Since OE is active-low and internally buffered, TI recommends sizing the resistor so that the voltage at OE remains ≥2.0 V (VIH) when driven low. For a typical 5-V system with 20-mA sink capacity, a 240-Ω resistor ensures reliable high-impedance default state.
How does the SN74ABT534ADB handle unused D inputs?
Unused D inputs on the SN74ABT534ADB must be held static - either tied to VCC or GND - to prevent floating nodes that could cause excessive ICC, noise coupling, or metastability. TI specifies this in Note 3 of the datasheet; leaving inputs unconnected violates recommended operating conditions and may degrade timing or increase power consumption.
SN74ABT534ADB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Type:
- -
- Output Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Clock Frequency:
- -
- Max Propagation Delay @ V, Max CL:
- -
- Trigger Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Current - Quiescent (Iq):
- -
- Input Capacitance:
- -
- Operating Temperature:
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- Grade:
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- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74ABT534ADB FAQ
1.How can I place an order for SN74ABT534ADB through Aetrix?
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5.How can I obtain technical support or documentation for SN74ABT534ADB?
For technical support, including SN74ABT534ADB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT534ADB requirements.
6.How does Aetrix verify that SN74ABT534ADB is sourced from the original manufacturer or authorized distributors?
All SN74ABT534ADB 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 SN74ABT534ADB meets industry standards.
7.What is the process for return or replacement of SN74ABT534ADB?
All SN74ABT534ADB units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT534ADB, 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 SN74ABT534ADB part is unused and in its original packaging.
Return procedure for SN74ABT534ADB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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