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Texas Instruments SN74ALS534ANSR
- Part No.:
- SN74ALS534ANSR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ALS534ANSR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,339
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Product details
Overview
SN74ALS534ANSR from Texas Instruments is an octal D-type edge-triggered flip-flop with inverting 3-state outputs, designed for bus driving in TTL-compatible digital systems. It operates at 0°C to 70°C, supports 35 MHz clock frequency, delivers ±24 mA output drive, and features buffered OE control independent of internal flip-flop operation - enabling bidirectional bus interfacing in industrial I/O and register applications.
For engineers reviewing the SN74ALS534ANSR datasheet, SN74ALS534ANSR pinout, SN74ALS534ANSR application, or SN74ALS534ANSR equivalent, key selection criteria include its inverted Q outputs, 20-pin SOP (NS) package, 3-state timing (tPZH = 3 ns, tPHZ = 1 ns), and compatibility with legacy ALS logic families in memory address latching and data buffering circuits.
Technical Context
This device implements eight independent D-type latches triggered on the positive edge of CLK, with each Q output delivering the logical complement of its D input. The OE input controls all eight outputs simultaneously, placing them in high-impedance state without affecting internal storage - supporting hot-swap bus arbitration and multi-master system design.
It uses bipolar ALS (Advanced Low-Power Schottky) technology, ensuring TTL-level voltage thresholds (VIH = 2 V, VIL = 0.8 V), low propagation delay (tPLH = 3 ns, tPHL = 4 ns at VCC = 5 V), and robust noise immunity. Its 3-state outputs are rated for 24 mA sink and 2.6 mA source current under recommended operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky) - ensures TTL compatibility with reduced power vs standard LS. |
| Clock Frequency | 35 MHz max - enables high-speed data capture in synchronous bus interfaces and register files. |
| Output Drive | 24 mA sink / 2.6 mA source - sufficient to drive 50-pF loads directly without external pull-ups or buffers. |
| Propagation Delay | tPLH = 3 ns, tPHL = 4 ns - supports tight timing margins in 20–30 MHz system clocks. |
| 3-State Enable Time | tPHZ = 1 ns, tPLZ = 2 ns - allows rapid bus release for time-critical arbitration and multiplexing. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL rails and tolerant of nominal supply variation. |
| Operating Temperature | 0°C to 70°C - qualified for commercial and industrial ambient environments. |
Pinout & Package
SOP (Small Outline Package) NS variant: 20-pin, 0.300-inch body width, 1.27 mm pitch, 2.65 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low control: pulls all Q outputs to high-Z when high; no effect on internal latch state. |
| 2–9 | 1D–8D | Data inputs - sampled on CLK↑ rising edge; inverted values appear at corresponding Q outputs. |
| 11–18 | 1Q–8Q | Inverting outputs - Qn = NOT(Dn) when OE is low; high-impedance when OE is high. |
| 10 | GND | Ground reference for all logic and output stages. |
| 20 | VCC | Positive supply (4.5–5.5 V); powers internal logic and output drivers. |
| 19 | CLK | Global clock input - positive-edge sensitive; synchronizes all eight flip-flops simultaneously. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting 3-state outputs | Enables direct connection to shared data/address buses without external inverters or bus transceivers. |
| Buffered OE input | Decouples output enable timing from internal clock domain - eliminates metastability risk during bus handoff. |
| High sink current (24 mA) | Drives heavy capacitive loads (e.g., backplane traces, multiple TTL inputs) without signal degradation. |
| Low propagation delay (3–4 ns) | Supports setup/hold timing closure in 25+ MHz synchronous designs with minimal margin overhead. |
| Independent data retention during OE high | Allows new D inputs to be loaded or old data preserved while outputs remain disabled - critical for pipelined I/O. |
Applications
| Industrial I/O Port Expansion | Memory Address Latching |
|---|---|
Use Scenario: Expanding microcontroller GPIO to drive 8-bit peripheral buses in PLC modules and motor controllers. IC Role / Device Role / Timing Role: Octal latch providing synchronized, isolated output staging with 3-state control for bus contention avoidance. Use Value: Eliminates need for discrete buffers or transceivers; 24 mA drive handles relay coils and opto-isolator inputs directly. |
Use Scenario: Capturing and holding upper address bits during multiplexed address/data cycles in 8080/Z80-based systems. IC Role / Device Role / Timing Role: Edge-triggered register freezing address lines at CLK↑, with OE enabling dynamic bus sharing with data lines. Use Value: Inverted outputs match common address decoder polarity; sub-5 ns delays prevent address skew in 3–4 MHz bus timing. |
| Legacy System Bus Buffering | Test Equipment Signal Conditioning |
Use Scenario: Isolating and driving legacy TTL backplanes in avionics test racks and instrumentation chassis. IC Role / Device Role / Timing Role: Bidirectional bus driver with fast enable/disable (1–2 ns) for controlled signal injection and monitoring. Use Value: High-impedance state prevents loading during idle periods; ALS speed ensures compatibility with 20–30 MHz bus clocks. |
Use Scenario: Synchronizing and conditioning parallel trigger/data signals between FPGA-based pattern generators and DUT interfaces. IC Role / Device Role / Timing Role: Input sampler and output formatter with precise edge alignment and glitch-free 3-state transitions. Use Value: Setup time (10 ns) and hold time (0 ns) simplify timing closure; inverted outputs match differential receiver polarity conventions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS374AN | Non-inverting outputs; identical pinout, timing, and drive capability. | Used where output polarity must match D-input logic without inversion (e.g., non-inverting bus transceivers). | Select when system logic requires true (non-inverted) Q outputs; otherwise SN74ALS534ANSR provides same timing with complementary behavior. |
| SN74AS534ANSR | Faster clock (125 MHz), tighter timing (tPLH = 3 ns, tPHL = 4 ns), higher drive (48 mA sink), but higher ICC (77–120 mA). | Suitable for high-speed test equipment or military-grade systems requiring extended frequency headroom. | Choose SN74AS534ANSR only if >35 MHz operation or >24 mA drive is required; SN74ALS534ANSR offers lower power and proven stability in commercial industrial use. |
Compared with SN74ALS374AN, SN74ALS534ANSR provides inverted outputs for direct interface with common decoder ICs, while retaining identical pinout and timing. Against SN74AS534ANSR, it trades speed and drive for lower power consumption and broader temperature margin within commercial grade.
Availability
SN74ALS534ANSR is available at Aetrix Electronics and suitable for industrial I/O expansion, memory address latching, and legacy TTL bus buffering requiring stable component supply across long-lifecycle embedded programs.
Supply support for SN74ALS534ANSR 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, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
SN74ALS534ANSR belongs to TI's legacy ALS logic family, engineered for high-speed, low-power TTL-compatible digital interfacing in systems where reliability, timing precision, and backward compatibility are critical.
FAQ
What is the function of the OE pin on the SN74ALS534ANSR?
The OE (Output Enable) pin on the SN74ALS534ANSR is an active-low control that places all eight Q outputs into a high-impedance state when asserted high. It does not affect internal flip-flop operation - data remains stored and can be updated via D inputs or CLK edges regardless of OE state. This enables safe bus sharing and hot-swap capability in multi-driver systems.
Does the SN74ALS534ANSR have non-inverting or inverting outputs?
The SN74ALS534ANSR has inverting outputs: each Qn output reflects the logical complement of its corresponding Dn input after the positive clock edge. This is confirmed by the function table and logic diagram in the official TI datasheet SDAS168B. For non-inverting behavior, SN74ALS374AN is the functional counterpart with identical pinout and timing.
What package type is used for the SN74ALS534ANSR?
The SN74ALS534ANSR uses a 20-pin SOP (Small Outline Package) with drawing code NS - distinct from SOIC (DW) and PDIP (N) variants. It measures 13.0 mm × 7.6 mm, has 1.27 mm lead pitch, 2.65 mm max height, and is supplied in tape-and-reel format (2000 units per reel) with MSL Level-1 rating.
Can the SN74ALS534ANSR operate at 3.3 V?
No, the SN74ALS534ANSR is specified only for 4.5 V to 5.5 V supply operation per TI's recommended conditions. It is not 3.3 V tolerant: VIH minimum is 2.0 V, but VCC below 4.5 V risks unreliable switching, increased propagation delay, and potential latch-up. For 3.3 V systems, consider modern alternatives like SN74LVC574A.
How does the SN74ALS534ANSR differ from the SN74AS534ANSR?
The SN74ALS534ANSR uses Advanced Low-Power Schottky (ALS) technology, offering 35 MHz max clock, 24 mA sink drive, and 19 mA ICC typical. The SN74AS534ANSR uses Advanced Schottky (AS), delivering 125 MHz clock, 48 mA sink, but 77–120 mA ICC. Both share pinout and 3-state functionality, but AS consumes significantly more power for higher speed.
SN74ALS534ANSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 35 MHz
- Max Propagation Delay @ V, Max CL:
- 16ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 2.6mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 19 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74ALS534ANSR FAQ
1.How can I place an order for SN74ALS534ANSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS534ANSR 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 SN74ALS534ANSR reliable?
The price and inventory of SN74ALS534ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS534ANSR is usually 5 days.
3.What payment methods are accepted for SN74ALS534ANSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS534ANSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS534ANSR?
SN74ALS534ANSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS534ANSR 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 SN74ALS534ANSR?
For technical support, including SN74ALS534ANSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS534ANSR requirements.
6.How does Aetrix verify that SN74ALS534ANSR is sourced from the original manufacturer or authorized distributors?
All SN74ALS534ANSR 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 SN74ALS534ANSR meets industry standards.
7.What is the process for return or replacement of SN74ALS534ANSR?
All SN74ALS534ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS534ANSR, 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 SN74ALS534ANSR part is unused and in its original packaging.
Return procedure for SN74ALS534ANSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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