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Texas Instruments 74ACT11623NT
- Part No.:
- 74ACT11623NT
- Manufacturer:
- Texas Instruments
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
74ACT11623NT.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,448
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Product details
Overview
74ACT11623NT from Texas Instruments is a 16-bit dual-supply bidirectional transceiver with independent A↔B bus direction control, TTL-compatible inputs, and flow-through pinout for PCB layout optimization. It operates from −40°C to 85°C at 4.5–5.5 V, delivers ±24 mA output drive, and supports asynchronous two-way data transfer between local buses in industrial control and legacy computing systems.
For engineers reviewing the 74ACT11623NT datasheet, 74ACT11623NT pinout, 74ACT11623NT application, or 74ACT11623NT equivalent, key selection criteria include its dual-enable latch capability, 1.5 ns minimum propagation delay, 500-mA latch-up immunity at 125°C, and NT-package compatibility with through-hole prototyping and high-reliability board assemblies.
Technical Context
The 74ACT11623NT implements a dual-control transceiver architecture where GBA enables B→A data flow and GAB enables A→B flow; simultaneous assertion of both enables transparent latching mode. Its EPIC (Enhanced-Performance Implanted CMOS) 1-µm process ensures stable operation across full industrial temperature range with low ground bounce.
Center-pin VCC and GND placement minimizes high-speed switching noise, while flow-through pin arrangement (A1–A8 left, B1–B8 right, controls centered) reduces trace crossovers. Input clamping (±20 mA) and output clamping (±50 mA) support robust ESD resilience without external protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL/CMOS logic rails and stable operation under rail droop. |
| Propagation Delay (tPLH/tPHL) | 1.5 ns (min) to 8.5 ns (max) - Enables sub-100 MHz bus handshaking in synchronous local bus interfaces. |
| Output Drive (IOL/IOH) | ±24 mA - Sustains signal integrity driving 50-pF loads across 16 bidirectional lines without external buffers. |
| Latch-Up Immunity | 500 mA typical at 125°C - Prevents destructive latch-up during transient overvoltage or hot-insertion events. |
| Input Voltage Thresholds | VIL = 0.8 V, VIH = 2.0 V - Guarantees reliable recognition of TTL-level signals across temperature and voltage corners. |
| Power Dissipation Capacitance | 41 pF (enabled), 8 pF (disabled) - Reduces dynamic power by >80% when transceiver is gated off between transfers. |
Pinout & Package
74ACT11623NT uses a 24-pin plastic dual-inline package (PDIP), 300-mil width, with through-hole mounting and industry-standard pin spacing. Pin 1 is top-left corner (notch-down orientation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | A-side bidirectional I/O | Connects to source bus; driven or high-impedance based on GAB/GBA state. |
| B1–B8 | B-side bidirectional I/O | Connects to destination bus; mirrors A-side data when enabled in respective direction. |
| GAB | A-to-B enable input | Active-high control: enables A→B data flow; disables outputs when low. |
| GBA | B-to-A enable input | Active-high control: enables B→A data flow; disables outputs when low. |
| VCC | Positive supply | Pins 14 and 20 - Dual center-supply pins reduce IR drop and switching noise. |
| GND | Ground reference | Pins 7, 8, 9, 10 - Four dedicated ground pins minimize ground bounce in high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| Local bus-latch capability | Simultaneous GAB and GBA assertion holds last valid 16-bit state on both A and B buses without external clock or storage. |
| TTL-voltage compatible inputs | Accepts standard 0.8 V / 2.0 V logic thresholds directly-no level-shifting required when interfacing with legacy TTL systems. |
| Flow-through architecture | A1–A8 on left, B1–B8 on right, controls centered-enables straight-layer PCB routing with zero trace crossovers. |
| Center-pin VCC/GND configuration | Dual VCC (pins 14,20) and quad GND (pins 7–10) suppress simultaneous switching noise in multi-bit parallel transfers. |
| EPIC 1-µm CMOS process | Delivers high noise margin (≥0.4 V DCNM), low static current (<40 µA), and proven reliability in long-life industrial deployments. |
Applications
| Industrial PLC Backplane Interface | Legacy Computer Memory Expansion Bus |
|---|---|
|
Use Scenario: Bidirectional data exchange between CPU module and I/O expansion cards in modular programmable logic controllers. IC Role / Device Role / Timing Role: Local bus transceiver managing 16-bit address/data multiplexing with direction controlled by FPGA-generated GAB/GBA strobes. Use Value: Flow-through pinout eliminates layer jumps on 4-layer backplanes; ±24 mA drive sustains signal integrity over 15-cm ribbon cable runs. |
Use Scenario: Adding RAM or ROM modules to ISA-bus-based embedded controllers using 80x86 derivatives. IC Role / Device Role / Timing Role: Level-translating transceiver enabling 5-V TTL memory access from mixed-voltage CPU subsystems. Use Value: TTL-compatible inputs accept direct connection to 8288 bus controller outputs; latch mode preserves bus state during DMA cycles. |
| Test Equipment Digital Pattern Generator | Avionics Maintenance Diagnostic Interface |
|
Use Scenario: Programmable stimulus delivery to DUT via parallel digital port with real-time direction reversal. IC Role / Device Role / Timing Role: High-speed bidirectional buffer synchronizing pattern generator outputs with DUT response capture timing. Use Value: 1.5 ns min propagation delay enables precise setup/hold timing margins; 500-mA latch-up immunity withstands probe misconnect events. |
Use Scenario: Field-service interface between portable diagnostic unit and aircraft subsystem data buses (e.g., ARINC 429 auxiliary ports). IC Role / Device Role / Timing Role: Isolation and buffering element ensuring galvanic separation and signal integrity during ground maintenance checks. Use Value: PDIP package allows manual replacement in ruggedized chassis; −40°C to 85°C rating meets DO-160 environmental test requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ACT11623DW | SOIC-24 package (surface-mount); identical electrical specs and pinout mapping. | Requires reflow assembly and PCB redesign; unsuitable for hand-soldered prototypes or through-hole field upgrades. | Select when board space is constrained and automated assembly is available. |
| 74ACT245N | 8-bit unidirectional (octal) transceiver; no dual-enable latch mode; single-direction control (DIR pin only). | Lacks bidirectional latching capability; requires external logic to emulate 16-bit dual-direction behavior. | Select only for simpler point-to-point 8-bit transfers where latch functionality is unnecessary. |
Compared with 74ACT11623DW, the 74ACT11623NT offers mechanical serviceability and thermal mass advantages in repairable systems; compared with 74ACT245N, it provides integrated 16-bit bidirectional latching-reducing component count and eliminating external direction-control logic.
Availability
74ACT11623NT is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy computer memory expansion, test equipment pattern generation, avionics diagnostic interfaces, and other applications requiring stable component supply with long-term obsolescence management.
Supply support for 74ACT11623NT 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.
The 74ACT11623NT belongs to TI's advanced CMOS (ACT) logic family, designed specifically for high-speed, noise-immune local bus interfacing in mission-critical industrial and computing systems.
FAQ
What is the operating temperature range of the 74ACT11623NT?
The 74ACT11623NT is characterized for operation from −40°C to +85°C. This industrial-grade temperature range ensures reliable performance in harsh environments such as factory automation cabinets, outdoor telecom enclosures, and vehicle-mounted diagnostic tools. All electrical specifications-including propagation delay, output drive, and input thresholds-are guaranteed across this full range.
Does the 74ACT11623NT support true bidirectional latching without external clocks?
Yes, the 74ACT11623NT supports true bidirectional latching without clocks or external storage elements. When both GAB and GBA are asserted high, the device enters transparent latch mode: each output reinforces its corresponding input, holding the last valid 16-bit state on both A and B buses as long as all other drivers remain high-impedance. This behavior is intrinsic to the 74ACT11623NT's internal architecture and requires no additional timing signals.
Can the 74ACT11623NT be used with 3.3-V logic systems?
No, the 74ACT11623NT is not rated for 3.3-V operation. It requires a 4.5–5.5-V supply and features TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V), making it intended for 5-V systems only. Interfacing with 3.3-V logic requires level-shifting circuitry; direct connection risks undriven inputs or excessive current due to voltage mismatch.
What is the significance of the "NT" suffix in 74ACT11623NT?
The "NT" suffix denotes the plastic dual-inline package (PDIP) variant of the 74ACT11623NT, standardized at 300-mil width with through-hole leads. This package enables manual soldering, socket-based prototyping, and field-replaceable designs-distinct from SOIC ("DW") or TSSOP variants. The NT package is explicitly listed in TI's official packaging documentation as an active, recommended-for-new-designs option.
How does the 74ACT11623NT handle bus isolation when disabled?
When either GAB or GBA is low, the corresponding direction path is disabled and its associated bus terminals enter high-impedance (Hi-Z) state. With both controls low, all 16 I/O lines (A1–A8 and B1–B8) present >10⁹ Ω impedance-effectively isolating the A and B buses. This isolation is verified by the datasheet's IOZ specification (±0.5 µA max leakage at 5.5 V), ensuring minimal crosstalk or loading in powered-down subsystems.
74ACT11623NT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-PDIP
74ACT11623NT FAQ
1.How can I place an order for 74ACT11623NT through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT11623NT 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 74ACT11623NT reliable?
The price and inventory of 74ACT11623NT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT11623NT is usually 5 days.
3.What payment methods are accepted for 74ACT11623NT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT11623NT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT11623NT?
74ACT11623NT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT11623NT 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 74ACT11623NT?
For technical support, including 74ACT11623NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT11623NT requirements.
6.How does Aetrix verify that 74ACT11623NT is sourced from the original manufacturer or authorized distributors?
All 74ACT11623NT 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 74ACT11623NT meets industry standards.
7.What is the process for return or replacement of 74ACT11623NT?
All 74ACT11623NT units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT11623NT, 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 74ACT11623NT part is unused and in its original packaging.
Return procedure for 74ACT11623NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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