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Texas Instruments SN74ABT823NT
- Part No.:
- SN74ABT823NT
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ABT823NT.pdf
- Description:
- IC FF D-TYPE SNGL 9BIT 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,729
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Product details
Overview
SN74ABT823NT from Texas Instruments is a 9-bit bus-interface D-type flip-flop with 3-state outputs, designed for high-drive bidirectional bus buffering in industrial and embedded systems. It features –32-mA IOH / 64-mA IOL drive strength, 125-MHz maximum clock frequency, and operates over –40°C to 85°C. Used in I/O port expansion and parity-enabled bus drivers where robust noise immunity and power-up high-impedance safety are required.
For engineers reviewing the SN74ABT823NT datasheet, SN74ABT823NT pinout, SN74ABT823NT application, or SN74ABT823NT equivalent, key selection criteria include its 24-pin PDIP (NT) package, TTL-compatible control inputs (CLKEN, OE, CLR), 3-state output behavior during power sequencing, and EPIC-II™ BiCMOS process enabling low ground bounce (<1 V VOLP) at 5 V.
Technical Context
This device implements nine edge-triggered D-type flip-flops with independent asynchronous clear (CLR), clock-enable (CLKEN), and buffered output-enable (OE) controls. Its EPIC-II™ BiCMOS architecture delivers high-speed switching (tPLH/tPHL ≤ 6.8 ns at 5 V, CL = 50 pF) while maintaining low static current (ICC ≤ 38 mA) and high noise immunity (VIK = –1.2 V).
The SN74ABT823NT supports safe power sequencing: outputs enter high-impedance state when VCC is between 0–2.1 V, and OE must be pulled up externally above 2.1 V to guarantee 3-state behavior. Input transition rate is specified at 5 ns/V, and latch-up performance exceeds 500 mA per JESD17.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 9-bit D-type flip-flop with 3-state outputs, edge-triggered on CLK↑ |
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL/CMOS systems |
| Output Drive | –32 mA IOH / 64 mA IOL - drives heavy capacitive buses without external buffers |
| Max Clock Frequency | 125 MHz - supports high-speed data latching in backplane and memory interface applications |
| Propagation Delay | tPLH/tPHL ≤ 6.8 ns (VCC = 5 V, CL = 50 pF) - enables tight timing margins in synchronous designs |
| Power-Up Behavior | High-impedance outputs when VCC < 2.1 V - prevents bus contention during supply ramp-up |
| ESD Protection | >2000 V HBM, >200 V machine model - enhances reliability in handling and assembly environments |
Pinout & Package
SN74ABT823NT is supplied in a 24-pin plastic dual in-line package (PDIP), designated NT by Texas Instruments. The package has 0.3-inch body width, 0.1-inch lead pitch, and through-hole mounting compatible with standard PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low 3-state control; high-impedance when high, normal logic when low |
| 2–10 | 1D–9D | Data inputs for nine D-type flip-flops |
| 11 | CLR (Clear) | Asynchronous active-low reset forcing all Q outputs low regardless of clock |
| 12 | GND | Ground reference for logic and output stages |
| 13–14 | CLKEN, CLK | CLKEN gates CLK signal; low CLKEN enables clocking, high disables and holds outputs |
| 15–23 | 1Q–9Q | Registered outputs corresponding to D inputs; 3-state when OE is high |
| 24 | VCC | Positive supply (4.5–5.5 V); powers BiCMOS output drivers and internal logic |
Key Features
| Feature | Design Value |
|---|---|
| EPIC-II™ BiCMOS Process | Reduces dynamic power vs. pure bipolar while retaining high drive and speed |
| High-Impedance Power Sequencing | Guaranteed Hi-Z when VCC ∈ [0, 2.1 V], preventing bus conflicts at power-up/down |
| Buffered Control Inputs | CLKEN, OE, and CLR have reduced DC loading - minimizes fanout burden on upstream logic |
| Low Ground Bounce | VOLP < 1 V at VCC = 5 V - maintains signal integrity on shared ground planes |
| Latch-Up Immunity | Exceeds 500 mA per JESD17 - ensures robustness in noisy industrial environments |
Applications
| Industrial Backplane Interface | Embedded I/O Expansion |
|---|---|
Use Scenario: Interfacing microcontroller GPIO banks to legacy parallel backplanes with long trace lengths and high capacitance. IC Role / Device Role / Timing Role: Acts as a registered, 3-state bus buffer that isolates MCU from bus transients and provides synchronized data capture on CLK↑. Use Value: High drive strength (64 mA IOL) ensures reliable signal integrity across 100+ pF loads; power-up Hi-Z prevents initialization glitches. |
Use Scenario: Expanding digital I/O capability in programmable logic controllers (PLCs) requiring hot-swap-safe peripheral connectivity. IC Role / Device Role / Timing Role: Functions as a latch + tri-state driver for parallel I/O ports, supporting read/write handshaking via OE and CLKEN. Use Value: Asynchronous CLR allows system-level reset coordination; buffered OE eliminates loading on control bus lines. |
| Parity-Enabled Bus Driver | Memory Address Latching |
Use Scenario: Driving 9-bit data + parity lines in fault-tolerant communication modules where bit-level error detection is mandatory. IC Role / Device Role / Timing Role: Provides synchronized, glitch-free output registration and 3-state isolation during parity check cycles. Use Value: Matched propagation delays across all 9 channels ensure simultaneous assertion of data and parity bits; low VOLP avoids false parity errors. |
Use Scenario: Latching address signals from a multiplexed CPU bus to static RAM or peripheral decoders in legacy 8/16-bit systems. IC Role / Device Role / Timing Role: Captures and holds address bits on rising clock edge, then presents stable outputs to memory enable logic. Use Value: 125-MHz max clock supports fast address setup; high-impedance outputs allow shared address/data bus reuse without contention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 9-bit bus-interface flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT821N | 8-bit version (not 9-bit); identical timing, drive, and package options | Not suitable for 9-bit data paths or parity-plus-8 configurations | Select only if bus width is exactly 8 bits and no parity extension is needed |
| SN74ALVC16373DL | 16-bit, 3.3-V only (1.65–3.6 V), lower drive (–24/+24 mA), different pinout | Requires level-shifting for 5-V systems; unsuitable for direct replacement in legacy 5-V designs | Consider only for new 3.3-V designs prioritizing lower power over legacy compatibility |
Compared with SN74ABT823NT, SN74ABT821N offers identical electrical behavior but lacks the ninth bit required for parity support, while SN74ALVC16373DL trades voltage compatibility and pin compatibility for higher density and lower voltage operation - neither is pin- or functionally interchangeable without board redesign.
Availability
SN74ABT823NT is available at Aetrix Electronics and suitable for industrial backplane interfaces, embedded I/O expansion, parity-enabled bus drivers, and memory address latching requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABT823NT 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 heritage in high-reliability logic families.
The SN74ABT823NT belongs to TI's ABT (Advanced BiCMOS Technology) logic series, engineered for high-speed, high-drive 5-V bus interfacing in industrial and military-grade systems where noise immunity and power sequencing safety are critical.
FAQ
What is the operating temperature range for SN74ABT823NT?
The SN74ABT823NT is characterized for operation from –40°C to +85°C, meeting commercial and industrial environmental requirements. This range is validated per the recommended operating conditions in the SCBS158E datasheet and applies specifically to the NT (plastic DIP) package variant. Operation outside this range may result in undefined timing or output behavior and is not guaranteed by Texas Instruments.
Does SN74ABT823NT support hot insertion or live insertion into a powered bus?
SN74ABT823NT supports controlled hot insertion due to its guaranteed high-impedance state when VCC is below 2.1 V and its robust ESD protection (>2000 V HBM). However, OE must be externally pulled to VCC via a resistor to ensure Hi-Z above 2.1 V; uncontrolled OE states during partial power application can cause bus contention. Full hot-plug compliance requires external circuitry per system-level design.
Can SN74ABT823NT be used with 3.3-V logic inputs?
No - SN74ABT823NT 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 CMOS outputs may meet VIH under nominal conditions, voltage margin degrades with temperature and process variation. For reliable 3.3-V interfacing, level-shifting or a 3.3-V-compatible alternative like SN74ALVC16373 is required.
What is the purpose of the CLKEN pin on SN74ABT823NT?
The CLKEN (clock enable) pin on SN74ABT823NT acts as a synchronous gate for the clock signal: when CLKEN is low, the device responds to rising edges on CLK; when CLKEN is high, the internal clock path is disabled and outputs hold their last state. This enables selective latching without toggling the main clock line, reducing system-wide clock distribution load and simplifying multi-device synchronization.
Is SN74ABT823NT RoHS compliant?
Yes - SN74ABT823NT is RoHS compliant per TI's packaging documentation. The NT package uses leaded solder (SnPb) finish, which qualifies under RoHS exemption 7a (lead in high-melting-temperature type solders). TI confirms full compliance status in the Package Option Addendum dated 15-Jul-2026, and the part marking reflects standard catalog production release.
SN74ABT823NT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 9
- Clock Frequency:
- 200 MHz
- Max Propagation Delay @ V, Max CL:
- 6.1ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 250 µA
- Input Capacitance:
- 4 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-PDIP
SN74ABT823NT FAQ
1.How can I place an order for SN74ABT823NT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT823NT 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 SN74ABT823NT reliable?
The price and inventory of SN74ABT823NT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT823NT is usually 5 days.
3.What payment methods are accepted for SN74ABT823NT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT823NT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT823NT?
SN74ABT823NT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT823NT 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 SN74ABT823NT?
For technical support, including SN74ABT823NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT823NT requirements.
6.How does Aetrix verify that SN74ABT823NT is sourced from the original manufacturer or authorized distributors?
All SN74ABT823NT 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 SN74ABT823NT meets industry standards.
7.What is the process for return or replacement of SN74ABT823NT?
All SN74ABT823NT units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT823NT, 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 SN74ABT823NT part is unused and in its original packaging.
Return procedure for SN74ABT823NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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