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NXP Semiconductors 74ABT623D,602
- Part No.:
- 74ABT623D,602
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74ABT623D,602.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,293
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Product details
Overview
74ABT623D,602 from NXP Semiconductors is an octal non-inverting 3-state bus transceiver with dual active-HIGH/active-LOW enables (OEAB and OEBA), designed for asynchronous bidirectional data transfer between two 8-bit buses. It delivers ±32 mA/±64 mA output drive, operates from 4.5 V to 5.5 V, and supports −40 °C to +85 °C ambient temperature in SO20 package.
For engineers reviewing the 74ABT623D,602 datasheet, 74ABT623D,602 pinout, 74ABT623D,602 application, or 74ABT623D,602 equivalent, key selection criteria include dual-enable timing flexibility, bus-isolation capability during 3-state mode, latch-up immunity >500 mA, HBM ESD >2000 V, and sub-5 ns propagation delay at 5 V.
Technical Context
The 74ABT623D,602 implements a BiCMOS architecture enabling simultaneous high-speed operation (tPLH/tPHL ≤ 4.6 ns) and low static/dynamic power dissipation. Its dual enable inputs (OEAB active HIGH, OEBA active LOW) allow independent control of A→B and B→A data paths, or concurrent enablement for bus-hold functionality.
When both OEAB and OEBA are asserted, the device enters transparent latch mode: outputs reinforce inputs, maintaining last valid logic states on both A and B buses while all external drivers are in high-impedance - a critical feature for bus arbitration and glitch-free state retention in backplane or modular systems.
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 across industrial voltage tolerances. |
| Propagation delay | ≤ 4.6 ns (An↔Bn) - enables reliable 200+ MHz bus operation in high-speed digital systems with tight timing budgets. |
| Output drive | +64 mA sink / −32 mA source - drives heavy capacitive loads (e.g., long PCB traces, multiple inputs) without signal degradation. |
| ESD protection | HBM >2000 V, MM >200 V - meets IEC 61000-4-2 Level 2 requirements for robust handling in manufacturing and field environments. |
| Operating temperature | −40 °C to +85 °C - qualified for industrial-grade applications including automation controllers and telecom infrastructure. |
| Bus isolation | High-impedance OFF-state (IOZ ≤ 50 µA) - prevents signal contention and crosstalk when either bus is disabled. |
| Latch-up immunity | >500 mA per JESD78B Class II Level A - guarantees survivability under transient overcurrent events in noisy power domains. |
Pinout & Package
74ABT623D,602 is housed in SO20 (SOT163-1) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm lead pitch, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OEAB) | Active-HIGH output enable for A→B direction | Drives B-bus outputs when HIGH; disables them (high-Z) when LOW - enables precise directional control without external logic. |
| 2–9 (A0–A7) | Bidirectional data terminals (A-side) | Connect to upstream bus; function as inputs when OEBA active, outputs when OEAB active - eliminates need for separate input/output buffers. |
| 10 (GND) | Ground reference | Primary return path for all internal logic and output currents; must be low-inductance connection to minimize ground bounce. |
| 11–18 (B0–B7) | Bidirectional data terminals (B-side) | Connect to downstream bus; function as inputs when OEAB active, outputs when OEBA active - supports full-duplex bus bridging. |
| 19 (OEBA) | Active-LOW output enable for B→A direction | Drives A-bus outputs when LOW; disables them (high-Z) when HIGH - complements OEAB for asymmetric enable timing. |
| 20 (VCC) | Positive supply | 5 V nominal supply; requires local 100 nF ceramic decoupling within 5 mm to suppress switching noise and ensure rail stability. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent enable control | OEAB (active HIGH) and OEBA (active LOW) allow asymmetric timing margins and eliminate race conditions in multi-master bus arbitration. |
| Bus-hold latching mode | Simultaneous assertion of OEAB and OEBA maintains last valid logic states on both A and B buses - prevents floating nodes during system reset or hot-swap transitions. |
| Power-up 3-state | Outputs remain in high-impedance until VCC stabilizes above 2.0 V - prevents spurious bus loading during power sequencing. |
| BiCMOS process technology | Combines bipolar speed and CMOS low static power - achieves <5 ns delay with ICC < 250 µA in standby, reducing thermal load in dense PCB layouts. |
| Robust I/O protection | Latch-up immunity >500 mA and HBM ESD >2000 V - eliminates need for external TVS diodes in most industrial interface designs. |
Applications
| Industrial Backplane Interface | Modular PLC I/O Expansion |
|---|---|
Use Scenario: Interfacing CPU module with distributed I/O carrier boards via shared 8-bit parallel bus. IC Role / Device Role / Timing Role: Bidirectional level-shifting and bus isolation transceiver managing data flow between master and slave modules. Use Value: Dual enable pins allow independent gating of read/write cycles; sub-5 ns delay ensures synchronization across 100 mm backplane traces. |
Use Scenario: Adding analog/digital I/O cards to programmable logic controller chassis with hot-swap capability. IC Role / Device Role / Timing Role: Bus buffer providing galvanically isolated data coupling between main controller and expansion slots. Use Value: Power-up 3-state prevents bus contention during card insertion; bus-hold mode retains last I/O state during firmware update. |
| Legacy System Bus Bridge | Test Equipment Signal Routing |
Use Scenario: Connecting modern microcontroller-based test fixture to legacy 8-bit ISA or STD bus peripherals. IC Role / Device Role / Timing Role: Protocol-transparent transceiver translating timing and drive strength between mismatched bus generations. Use Value: ±64 mA drive compensates for ISA bus capacitance; 5.5 V absolute max rating accommodates older 5.25 V supplies. |
Use Scenario: Configurable signal path routing in automated test equipment with multiple DUT interfaces. IC Role / Device Role / Timing Role: Reconfigurable bus switch enabling dynamic assignment of stimulus/response channels. Use Value: Independent OEAB/OEBA control allows real-time channel reassignment without FPGA reconfiguration; 2000 V HBM withstands probe contact discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVT623PW,118 | Lower VCC range (2.7–3.6 V); 3.3 V only; 32 mA drive; TSSOP20 package | Designed for low-voltage embedded systems; not 5 V tolerant | Select when migrating to 3.3 V logic domains and requiring footprint compatibility with TSSOP20 layout. |
| SN74ABT245N | Single-directional 8-bit transceiver; single active-LOW enable; DIP20 package; no bus-hold mode | Lacks dual-enable flexibility and transparent latch capability; through-hole mounting | Choose for cost-sensitive, fixed-direction bus extension where board space permits DIP and timing constraints are relaxed. |
Compared with 74ABT623D,602, the 74LVT623PW,118 reduces power but sacrifices 5 V interoperability and bus-hold functionality, while SN74ABT245N simplifies control logic at the expense of bidirectional timing agility and state retention - making 74ABT623D,602 optimal for dynamic, multi-master industrial bus architectures.
Availability
74ABT623D,602 is available at Aetrix Electronics and suitable for industrial backplane interfaces, modular PLC I/O expansion, legacy system bus bridging, and test equipment signal routing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74ABT623D,602 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 headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The 74ABT623D,602 belongs to NXP's ABT-series advanced BiCMOS logic family, engineered specifically for high-speed, low-power bidirectional bus interfacing in industrial control and communications infrastructure.
FAQ
What is the function of the dual enable inputs OEAB and OEBA on the 74ABT623D,602?
The 74ABT623D,602 uses OEAB (pin 1, active HIGH) to enable data flow from A-bus to B-bus, and OEBA (pin 19, active LOW) to enable data flow from B-bus to A-bus. When both are asserted, the device enters bus-hold mode - reinforcing inputs to maintain last valid logic states on both buses. This configuration eliminates external latches in bus arbitration circuits and prevents floating nodes during power transitions.
Does the 74ABT623D,602 support 5 V operation and what are its absolute maximum ratings?
Yes, the 74ABT623D,602 is fully rated for 5 V operation with recommended VCC of 4.5 V to 5.5 V. Its absolute maximum supply voltage is +7.0 V, input voltage range is −1.2 V to +7.0 V, and output voltage in OFF-state or HIGH-state is −0.5 V to +5.5 V. Exceeding these limits risks permanent damage per IEC 60134 limiting values - design must observe current limits (e.g., IO ≤ 128 mA) and thermal derating above 70 °C.
How does the 74ABT623D,602 achieve bus isolation and prevent signal contention?
The 74ABT623D,602 achieves bus isolation via true 3-state outputs: when either OEAB or OEBA is deasserted, corresponding outputs enter high-impedance (Z) state with IOZ ≤ 50 µA. This electrically disconnects the A or B bus, preventing current flow and signal contention. The dual-enable architecture allows independent disabling of each direction - critical for safe hot-swap operations and multi-master arbitration in shared-bus systems.
What is the significance of "power-up 3-state" in the 74ABT623D,602 datasheet?
"Power-up 3-state" means the 74ABT623D,602 outputs remain in high-impedance until VCC rises above 2.0 V, regardless of enable pin states. This prevents spurious bus loading or data corruption during power ramp-up. For the 74ABT623D,602, this behavior is inherent to its BiCMOS design and requires no external reset circuitry - simplifying power sequencing in systems with multiple voltage rails or unregulated supplies.
Can the 74ABT623D,602 be used in place of the obsolete 74F623 or 74AS623?
Yes, the 74ABT623D,602 is a direct functional and pin-compatible replacement for 74F623 and 74AS623 in SO20 packages, offering identical pinout, 5 V operation, and enhanced specs: lower ICC (250 µA vs. >10 mA for 74F), faster propagation (≤4.6 ns vs. ≥7 ns), higher drive (±64 mA vs. ±20 mA), and superior ESD/latch-up protection. No PCB changes are required, though decoupling capacitor placement should follow ABT-series guidelines for optimal noise immunity.
74ABT623D,602 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74ABT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
74ABT623D,602 FAQ
1.How can I place an order for 74ABT623D,602 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT623D,602 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 74ABT623D,602 reliable?
The price and inventory of 74ABT623D,602 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT623D,602 is usually 5 days.
3.What payment methods are accepted for 74ABT623D,602?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT623D,602 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ABT623D,602?
74ABT623D,602 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT623D,602 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 74ABT623D,602?
For technical support, including 74ABT623D,602 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT623D,602 requirements.
6.How does Aetrix verify that 74ABT623D,602 is sourced from the original manufacturer or authorized distributors?
All 74ABT623D,602 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 74ABT623D,602 meets industry standards.
7.What is the process for return or replacement of 74ABT623D,602?
All 74ABT623D,602 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT623D,602, 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 74ABT623D,602 part is unused and in its original packaging.
Return procedure for 74ABT623D,602:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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