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Texas Instruments SN74ALS996NT3
- Part No.:
- SN74ALS996NT3
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ALS996NT3.pdf
- Description:
- BUS DRIVER, ALS SERIES
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Inventory:2,660
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Product details
Overview
SN74ALS996NT3 from Texas Instruments is an 8-bit edge-triggered D-type flip-flop with 3-state outputs, bus-structured pinout, and read-back capability for bidirectional data bus interfacing. It operates at up to 35 MHz, supports true/complement output polarity control via T/C input, and features asynchronous clear (CLR), output enable (OE), and read (RD) functions. It is used in legacy industrial control backplanes and microprocessor system data latching.
For engineers reviewing the SN74ALS996NT3 datasheet, SN74ALS996NT3 pinout, SN74ALS996NT3 application, or SN74ALS996NT3 equivalent, key selection criteria include its 24-pin PDIP (NT) package, 0°C to 70°C temperature range, 48 mA low-level output drive (–1 version only), bus-compatible 3-state I/O architecture, and compatibility with ALS logic families.
Technical Context
This device implements eight independent D-type flip-flops triggered on the low-to-high CLK transition when EN is low. Internal registers retain data during OE high (high-impedance outputs), and RD enables read-back of Q outputs onto D inputs - requiring EN low and CLK high to avoid bus contention.
The T/C input selects non-inverted (T/C = H) or inverted (T/C = L) Q output polarity. CLR asynchronously resets all flip-flops low. Timing parameters are specified for VCC = 4.5 V to 5.5 V, with tPLH/tPHL propagation delays ≤28 ns and setup/hold times tightly constrained (e.g., tsu = 15 ns, th = 5 ns).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced Low-Power Schottky (ALS), TTL-compatible input thresholds and output drive |
| Function | 8-bit edge-triggered D flip-flop with 3-state outputs, read-back, polarity control, and async clear |
| Max Clock Frequency | 35 MHz - supports high-speed data capture in legacy microprocessor bus cycles |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL systems; absolute max 7 V |
| Output Drive (IOL) | 24 mA (standard); 48 mA only for –1 version under 4.75–5.25 V - not applicable to SN74ALS996NT3 |
| Operating Temperature | 0°C to 70°C - commercial-grade rating; SN54ALS996 variants support −55°C to 125°C |
| Package | 24-pin plastic dual-in-line (NT) - through-hole mounting, 300-mil width, JEDEC MO-058 AA compliant |
Pinout & Package
SN74ALS996NT3 uses a 24-pin plastic DIP (NT) package with 300-mil body width, standard through-hole footprint, and JEDEC MO-058 AA mechanical outline. Pin 1 is marked by notch or dot; pin numbering follows standard DIP convention (counter-clockwise from top-left corner).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1D–8D (Pins 1,2,3,4,5,6,7,8) | Data Inputs | Asynchronous D inputs for each flip-flop; accept TTL-level signals; read-back source when RD active |
| EN (Pin 9) | Enable Control | Low enables clocking and read-back; transitions must occur only when CLK is high to prevent false triggering |
| RD (Pin 10) | Read Control | Low enables read-back mode: Q outputs driven onto D inputs; requires EN low and CLK high |
| CLK (Pin 11) | Clock Input | Positive-edge-triggered; low-to-high transition latches D inputs into flip-flops when EN is low |
| GND (Pin 12) | Ground Reference | Power return path for logic and output drivers; decoupling recommended near pin |
| VCC (Pin 24) | Supply Voltage | +5 V nominal supply; must be stable within 4.5–5.5 V for guaranteed operation |
| 1Q–8Q (Pins 13–20) | Registered Outputs | Bus-driving 3-state outputs; polarity controlled by T/C; disabled by OE high |
| OE (Pin 21) | Output Enable | High places all Q outputs in high-impedance state; does not affect internal register state |
| T/C (Pin 22) | True/Complement Select | High → Q = stored data; Low → Q = inverted stored data; affects all outputs simultaneously |
| CLR (Pin 23) | Asynchronous Clear | Active-low reset; forces all flip-flops to 0 regardless of CLK, EN, or RD state |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | Enables direct PCB routing between D and Q pins across adjacent channels, reducing trace crosstalk and layout complexity in backplane designs |
| 3-state I/O with read-back capability | Allows single-bus bidirectional data flow: write to registers via D inputs, then read stored values back onto same bus using RD and EN |
| True/complement output polarity control | T/C input lets system firmware select non-inverted or inverted Q outputs without external inverters - critical for bus parity or signal alignment |
| Asynchronous clear with override priority | CLR forces all registers low immediately, independent of clock or enable state - essential for deterministic power-on or fault-recovery initialization |
| ALS family performance | Delivers 35 MHz operation with <28 ns propagation delay and 15 ns setup time while maintaining TTL-compatible voltage levels and noise margins |
Applications
| Industrial Backplane Data Latching | Microprocessor System Bus Interface |
|---|---|
|
Use Scenario: Storing address/data from a shared ISA-style bus during DMA cycles or peripheral handshaking. IC Role / Device Role / Timing Role: Acts as an 8-bit transparent latch and read-back register synchronized to CPU CLK and controlled by EN/RD/OE. Use Value: Eliminates need for separate latch + transceiver ICs; enables compact, low-latency bus snooping and diagnostic read-back in PLC I/O modules. |
Use Scenario: Capturing and holding status flags from multiple sensors before parallel-to-serial conversion. IC Role / Device Role / Timing Role: Functions as a synchronized input register with configurable output polarity (T/C) and bus-isolation (OE). Use Value: Reduces component count in sensor interface cards; allows real-time flag monitoring via read-back without interrupting main data flow. |
| Legacy Test Equipment Signal Capture | Digital Logic Training Board |
|
Use Scenario: Sampling and freezing waveforms from digital circuit nodes for manual analysis on analog oscilloscopes. IC Role / Device Role / Timing Role: Serves as a manually triggered snapshot register - CLK edge captures D inputs, Q outputs drive scope probe points. Use Value: Provides deterministic, glitch-free sampling with visible bus-drive strength (24 mA) suitable for driving passive probes and indicator LEDs. |
Use Scenario: Teaching synchronous logic design principles including edge-triggering, 3-state control, and bus contention avoidance. IC Role / Device Role / Timing Role: Demonstrates multi-function register behavior: write (CLK+EN), read-back (RD+EN), polarity inversion (T/C), and output disable (OE). Use Value: Enables hands-on verification of timing constraints (tsu/th), bus-structured pin mapping, and asynchronous reset behavior in lab environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit registered bus-interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS573N | Octal transparent latch (no flip-flop clocking, no read-back, no T/C control); identical NT package and ALS specs | Lacks edge-triggered storage and bidirectional read-back; suited only for level-sensitive latching | Select when synchronous clocking and read-back are unnecessary; lower complexity and cost |
| SN74ALS273N | 8-bit D flip-flop with CLR but no RD, T/C, or 3-state outputs; same NT package and timing | Outputs always enabled; no bus-sharing capability; no polarity inversion | Choose for simple clocked storage where outputs drive dedicated lines, not shared buses |
Compared with SN74ALS996NT3, SN74ALS573N offers simpler level-sensitive latching without clock edge dependency or read-back, while SN74ALS273N provides basic edge-triggered storage but lacks bus interface features - making SN74ALS996NT3 uniquely suited for bidirectional, polarity-configurable, 3-state bus applications.
Availability
SN74ALS996NT3 is available at Aetrix Electronics and suitable for industrial backplane latching, microprocessor bus interfacing, and legacy test equipment signal capture requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS996NT3 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 solutions with broad industrial and automotive reach.
SN74ALS996NT3 belongs to TI's legacy Advanced Low-Power Schottky (ALS) logic family, designed for high-speed, low-power TTL-compatible systems in 1980s-era computing, instrumentation, and industrial control platforms.
FAQ
What is the operating temperature range for SN74ALS996NT3?
The SN74ALS996NT3 is rated for commercial operation from 0°C to 70°C. This distinguishes it from the military-grade SN54ALS996 variant, which operates from −55°C to 125°C. The NT package is specified only for this commercial range, and operation outside these limits may result in parametric failure or reduced reliability. Always verify ambient and junction temperatures in final PCB layout.
Does SN74ALS996NT3 support 48 mA output drive?
No, SN74ALS996NT3 does not support 48 mA output drive. That specification applies exclusively to the SN74ALS996-1 version (e.g., SN74ALS996-1DWR) under strict 4.75–5.25 V VCC conditions. The standard SN74ALS996NT3 is rated for 24 mA IOL per output. Using it in 48 mA-demanding circuits risks output voltage degradation or thermal overstress.
How does the read-back function work on SN74ALS996NT3?
The read-back function on SN74ALS996NT3 activates when both EN and RD are low while CLK is high. This drives the current Q output states onto the corresponding D inputs, enabling bidirectional bus use. Crucially, EN must remain low during the entire read cycle, and CLK must stay high to prevent unintended latching - violating this timing causes bus contention or metastability.
Can SN74ALS996NT3 be used as a drop-in replacement for SN74ALS573N?
No, SN74ALS996NT3 is not a drop-in replacement for SN74ALS573N. While both use the same NT package and share ALS logic levels, SN74ALS996NT3 is edge-triggered (CLK-dependent) with read-back and polarity control, whereas SN74ALS573N is level-sensitive (transparent latch). Pin functions differ significantly - e.g., RD, T/C, and CLR on SN74ALS996NT3 have no counterpart on SN74ALS573N.
What is the purpose of the T/C pin on SN74ALS996NT3?
On SN74ALS996NT3, the T/C (True/Complement) pin controls output polarity: when T/C = HIGH, Q outputs mirror the stored register values; when T/C = LOW, Q outputs are inverted. This eliminates external inverters in applications requiring programmable signal polarity - such as bus parity generation, differential signaling interfaces, or configurable logic test patterns.
SN74ALS996NT3 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:
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SN74ALS996NT3 FAQ
1.How can I place an order for SN74ALS996NT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS996NT3 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 SN74ALS996NT3 reliable?
The price and inventory of SN74ALS996NT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS996NT3 is usually 5 days.
3.What payment methods are accepted for SN74ALS996NT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS996NT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS996NT3?
SN74ALS996NT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS996NT3 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 SN74ALS996NT3?
For technical support, including SN74ALS996NT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS996NT3 requirements.
6.How does Aetrix verify that SN74ALS996NT3 is sourced from the original manufacturer or authorized distributors?
All SN74ALS996NT3 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 SN74ALS996NT3 meets industry standards.
7.What is the process for return or replacement of SN74ALS996NT3?
All SN74ALS996NT3 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS996NT3, 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 SN74ALS996NT3 part is unused and in its original packaging.
Return procedure for SN74ALS996NT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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