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NXP Semiconductors 74ABT646AD,118
- Part No.:
- 74ABT646AD,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74ABT646AD,118.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,019
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Product details
Overview
74ABT646AD,118 from NXP Semiconductors is an octal bus transceiver/register with 3-state outputs, combining BiCMOS logic for high-speed bidirectional data transfer (max 350 MHz), ±64 mA/−32 mA output drive, and dual independent A/B registers for real-time or stored-bus operation in industrial control backplanes and memory-mapped I/O systems.
For engineers reviewing the 74ABT646AD,118 datasheet, 74ABT646AD,118 pinout, 74ABT646AD,118 application, or 74ABT646AD,118 equivalent, this device supports multiplexed bus management-real-time transfer, register storage, isolation, and stored-data forwarding-with precise timing control via CPAB/CPBA clocks and DIR/OE/SAB/SBA inputs.
Technical Context
The 74ABT646AD,118 implements a dual-register transceiver architecture where CPAB and CPBA independently clock data into A-side and B-side D-type flip-flops, while DIR selects direction and OE enables/disables 3-state outputs. SAB and SBA determine whether data flows directly or is latched before transfer.
Its BiCMOS process delivers low propagation delays (tPLH/tPHL ≤ 5.6 ns), fast 3-state switching (tPZH ≤ 6.3 ns), and robust ESD protection (HBM > 2000 V, MM > 200 V), operating across −40 °C to +85 °C at 4.5–5.5 V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Octal bidirectional bus transceiver with dual independent A/B registers and 3-state outputs |
| Max frequency | 350 MHz - supports high-throughput parallel bus interfaces without timing bottlenecks |
| Output drive | +64 mA sink / −32 mA source - drives heavy capacitive loads and multiple TTL inputs directly |
| Propagation delay | ≤ 5.6 ns (CPAB→Bn) - ensures tight setup/hold timing margins in 50 MHz+ synchronous buses |
| Supply voltage | 4.5–5.5 V - compatible with standard 5 V logic rails and tolerant of rail droop |
| Operating temp | −40 °C to +85 °C - qualified for industrial-grade embedded and automation equipment |
| ESD rating | HBM > 2000 V, MM > 200 V - withstands handling and board-level electrostatic events |
Pinout & Package
74ABT646AD,118 is supplied in SO24 (SOT137-1) plastic small outline package: 24-pin, 7.5 mm body width, 1.27 mm pitch, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CPAB | A-to-B clock input | Triggers latching of A-bus data into B-side register on LOW-to-HIGH transition |
| 2 SAB | A-to-B select input | Enables real-time A→B transfer when active; stores A data when inactive and OE HIGH |
| 3 DIR | Direction control input | When LOW: B bus drives A bus; when HIGH: A bus drives B bus (with OE active) |
| 4–11 A0–A7 | A-side I/O terminals | Bidirectional data lines; input when driving B bus, output when driven by B bus or B register |
| 12 GND | Ground reference | 0 V return path for all internal logic and output drivers |
| 13–20 B0–B7 | B-side I/O terminals | Bidirectional data lines; input when driving A bus, output when driven by A bus or A register |
| 21 OE | Output enable (active LOW) | Disables all outputs to high-impedance state; input functions remain active during isolation |
| 22 SBA | B-to-A select input | Enables real-time B→A transfer when active; stores B data when inactive and OE HIGH |
| 23 CPBA | B-to-A clock input | Triggers latching of B-bus data into A-side register on LOW-to-HIGH transition |
| 24 VCC | Positive supply | 4.5–5.5 V power rail; powers all logic, registers, and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent registers | Separate A and B flip-flop banks allow concurrent storage and forwarding-no bus contention during register updates |
| Multiplexed real-time & stored transfer | Four distinct operational modes (real-time A↔B, store A/B, isolate, forward stored data) controlled by OE/DIR/SAB/SBA |
| Live insertion/extraction support | Power-up 3-state and latch-up immunity (>500 mA) permit hot-swap in backplane and modular systems |
| High-current 3-state outputs | +64 mA sink capability enables direct drive of 10+ TTL loads or long PCB traces without buffers |
| Robust thermal & electrical specs | 150 °C max junction temperature and 5.5 V absolute max supply ensure reliability under transient overvoltage or ambient stress |
Applications
| Industrial Backplane Interface | Memory-Mapped I/O Expansion |
|---|---|
Use Scenario: Connecting microcontroller local bus to multi-slot industrial backplane with isolated modules. IC Role / Device Role / Timing Role: Bidirectional data bridge with register buffering to decouple timing between master and slave slots. Use Value: Enables deterministic latency via stored-data forwarding and prevents bus contention during slot insertion/removal. | Use Scenario: Expanding GPIO or peripheral address space in PLC CPU modules using shared address/data bus. IC Role / Device Role / Timing Role: Transceiver/register that latches control/status data from peripherals and presents it synchronously to CPU. Use Value: Eliminates need for external latches; supports simultaneous read/write handshaking with 5.6 ns timing margin. |
| Legacy Bus Protocol Translation | Test Equipment Data Capture |
Use Scenario: Interfacing 8-bit ISA-style bus to modern FPGA-based controller with asynchronous handshake signals. IC Role / Device Role / Timing Role: Real-time bus transceiver with direction control and register hold for protocol alignment. Use Value: Allows FPGA to sample stable registered values instead of metastable real-time bus transitions. | Use Scenario: Capturing parallel digital waveform data from DUT into test system memory at up to 350 MHz sampling rate. IC Role / Device Role / Timing Role: High-speed data capture buffer with clocked register staging before DMA transfer. Use Value: Achieves 350 MHz effective capture rate using CPAB/CPBA edge-triggered latching and 3-state isolation during readout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver/register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ABT245A | No internal registers; only real-time transceiver function; lower drive (+32 mA/−64 mA) | Lacks stored-data forwarding and isolation modes; suitable only for simple bidirectional bus extension | Select when register functionality is unnecessary and cost or footprint reduction is prioritized |
| 74ABT373A | Octal transparent latch only; unidirectional; no transceiver capability or DIR/OE control | Supports only A→Q latching; cannot perform bidirectional bus transfer or real-time pass-through | Select when only one-way registered data capture is required, not bidirectional bus management |
Compared with 74ABT245A and 74ABT373A, the 74ABT646AD,118 uniquely integrates both transceiver and dual-register functions in one SO24 package-enabling four distinct bus management modes without external logic or layout changes.
Availability
74ABT646AD,118 is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory-mapped I/O expansion, legacy bus protocol translation, and test equipment data capture requiring stable component supply and long-term production continuity.
Supply support for 74ABT646AD,118 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
NXP Semiconductors is a global semiconductor company specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The 74ABT646AD,118 belongs to NXP's ABT-series high-speed BiCMOS logic family, designed specifically for robust, low-latency parallel bus interfacing in industrial control and instrumentation systems.
FAQ
What is the primary function of the 74ABT646AD,118?
The 74ABT646AD,118 is an octal bus transceiver/register with dual independent A/B registers and 3-state outputs. It performs real-time bidirectional data transfer, register storage, isolation, and stored-data forwarding-controlled by DIR, OE, SAB, SBA, CPAB, and CPBA inputs. Its BiCMOS design enables high speed (up to 350 MHz), strong drive (+64 mA sink), and industrial temperature operation (−40 °C to +85 °C).
Does the 74ABT646AD,118 support hot-swap or live insertion?
Yes, the 74ABT646AD,118 supports live insertion and extraction due to its power-up 3-state behavior and latch-up protection exceeding 500 mA per JESD78B Class II Level A. This allows safe connection/disconnection in powered backplane or modular systems without disrupting adjacent circuitry-critical for industrial maintenance and field-replaceable units.
What are the key timing parameters for the 74ABT646AD,118?
Key timing parameters for the 74ABT646AD,118 include maximum frequency of 350 MHz, CPAB→Bn propagation delay ≤ 5.6 ns, An→Bn delay ≤ 4.8 ns, OE→output enable time ≤ 6.3 ns (tPZH), and setup/hold times of 3.0 ns/0.0 ns respectively. All values are specified across −40 °C to +85 °C at VCC = 5.0 V ± 0.5 V, ensuring reliable timing in industrial environments.
How does the 74ABT646AD,118 differ from the 74ABT245A?
The 74ABT646AD,118 integrates both transceiver and dual-register functionality, supporting four operational modes (real-time transfer, register storage, isolation, stored-data forwarding). In contrast, the 74ABT245A is a basic octal transceiver with no internal registers, limited to real-time bidirectional transfer only-and offers lower output drive (+32 mA/−64 mA vs. +64 mA/−32 mA).
What package type is used for the 74ABT646AD,118?
The 74ABT646AD,118 uses the SO24 (SOT137-1) plastic small outline package: 24-pin, 7.5 mm body width, 1.27 mm pitch, surface-mount compatible. This package is explicitly listed in NXP's ordering information for the "74ABT646AD" variant and is RoHS-compliant with industrial temperature rating (−40 °C to +85 °C).
74ABT646AD,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74ABT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SO
74ABT646AD,118 FAQ
1.How can I place an order for 74ABT646AD,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT646AD,118 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 74ABT646AD,118 reliable?
The price and inventory of 74ABT646AD,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT646AD,118 is usually 5 days.
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Once your 74ABT646AD,118 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 74ABT646AD,118?
For technical support, including 74ABT646AD,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT646AD,118 requirements.
6.How does Aetrix verify that 74ABT646AD,118 is sourced from the original manufacturer or authorized distributors?
All 74ABT646AD,118 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 74ABT646AD,118 meets industry standards.
7.What is the process for return or replacement of 74ABT646AD,118?
All 74ABT646AD,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT646AD,118, 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 74ABT646AD,118 part is unused and in its original packaging.
Return procedure for 74ABT646AD,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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