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NXP Semiconductors 74ABT620D,623
- Part No.:
- 74ABT620D,623
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74ABT620D,623.pdf
- Description:
- IC TXRX INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,062
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Product details
Overview
74ABT620D,623 from NXP Semiconductors (formerly Philips) is an octal bidirectional transceiver with dual active-high/active-low enables and inverting 3-State outputs, operating at 4.5–5.5 V, delivering ±64 mA output drive, 3.1 ns typical propagation delay (An↔Bn), and designed for asynchronous bus isolation in industrial control backplanes and memory-mapped I/O interfaces.
For engineers reviewing the 74ABT620D,623 datasheet, 74ABT620D,623 pinout, 74ABT620D,623 application, or 74ABT620D,623 equivalent, key selection criteria include dual-directional enable logic (OEAB high-active, OEBA low-active), inverting data path behavior, 20-pin SO package compatibility, and guaranteed operation across –40°C to +85°C industrial temperature range.
Technical Context
The 74ABT620D,623 implements a BiCMOS-based octal transceiver architecture with independent A→B and B→A data paths controlled by separate enable inputs. Its inverting logic applies identically in both directions: when enabled, An drives inverted signal to Bn, and Bn drives inverted signal to An.
It supports live insertion/extraction via power-up 3-State and latch-up protection exceeding 500 mA per JEDEC Std 17. Output drive capability of +64 mA (sink) / –32 mA (source) enables direct interface with TTL and CMOS loads without external buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with 5 V TTL/CMOS systems and margin against rail droop. |
| Propagation Delay | 3.1 ns typical (An↔Bn, CL = 50 pF) - enables high-speed bus handshaking up to ~200 MHz effective toggle rate. |
| Output Drive | +64 mA sink / –32 mA source - drives heavy capacitive loads and multiple TTL inputs without fanout limitation. |
| Input Capacitance | 4 pF (OEAB/OEBA) - minimizes switching noise and timing skew on enable control lines. |
| I/O Capacitance | 7 pF (outputs disabled) - reduces crosstalk and dynamic power during 3-State isolation. |
| Quiescent Supply Current | 50 µA (outputs disabled, VCC = 5.5 V) - enables low-power standby in always-on industrial modules. |
Pinout & Package
74ABT620D,623 is supplied in a 20-pin plastic small outline package (SO20, SOT163-1), 7.5 mm body width, with standard 1.27 mm pitch and gull-wing leads compatible with IPC-7351B footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OEAB | Active-high output enable for A→B direction; asserts inversion and drives Bn when high. |
| 2–9 | A0–A7 | Bidirectional I/O pins on A bus; input when OEAB low & OEBA high, output (inverted) when enabled. |
| 10 | GND | Reference ground for all logic and output stages; must be low-impedance for noise immunity. |
| 11–18 | B0–B7 | Bidirectional I/O pins on B bus; input when OEBA low & OEAB high, output (inverted) when enabled. |
| 19 | OEBA | Active-low output enable for B→A direction; asserts inversion and drives An when low. |
| 20 | VCC | +5 V supply; decoupling capacitor (100 nF ceramic) required within 5 mm for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Octal bidirectional data path with independent enables | Enables full-duplex bus arbitration without external logic; OEAB and OEBA allow simultaneous A→B and B→A isolation. |
| Inverting transceiver logic | Guarantees signal polarity inversion on both transmit paths-critical for differential-complement bus architectures and legacy system compatibility. |
| Power-up 3-State | Prevents bus contention during power ramp; outputs remain high-impedance until VCC stabilizes above 2.1 V. |
| Live insertion/extraction support | Allows hot-swap module replacement in backplane systems without system reset or bus lockup. |
| Latch-up immunity >500 mA | Meets JEDEC Std 17 for robustness in noisy industrial environments with transient coupling or ESD events. |
Applications
| Industrial Backplane Interface | Memory-Mapped I/O Expansion |
|---|---|
|
Use Scenario: Isolating CPU local bus from peripheral expansion slots in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Bidirectional level-shifting and bus contention prevention between processor and add-on I/O cards. Use Value: Dual enable logic allows independent gating of read/write cycles; inverting behavior matches legacy ISA-style address/data strobe timing. |
Use Scenario: Extending microcontroller GPIO count via parallel peripheral interface with shared address/data bus. IC Role / Device Role / Timing Role: Transceiver enabling time-multiplexed access to external ADCs, DACs, and GPIO expanders. Use Value: ±64 mA drive supports 10+ TTL loads per line; 3.1 ns delay preserves setup/hold margins at 20 MHz bus clock. |
| Legacy System Bus Bridge | Test Equipment Signal Routing |
|
Use Scenario: Interfacing modern FPGA-based controllers to vintage 8-bit microprocessor buses (e.g., Z80, 6502). IC Role / Device Role / Timing Role: Inverting transceiver matching original bus protocol polarity and timing requirements. Use Value: Pin-compatible replacement for obsolete 74LS620; same function table and enable polarity eliminates redesign. |
Use Scenario: Reconfigurable signal routing matrix in automated test equipment (ATE) for DUT stimulus/response isolation. IC Role / Device Role / Timing Role: High-speed bidirectional switch enabling flexible path assignment between instruments and device pins. Use Value: Live insertion support permits in-system reconfiguration; 7 pF I/O capacitance minimizes signal distortion at 100 MHz edge rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT620DBR | Same ABT family, identical logic, 20-pin SSOP (SOT339-1); slightly higher tPLH max (4.3 ns vs 4.1 ns). | SSOP footprint requires PCB redesign; better thermal resistance but lower moisture sensitivity than SO. | Select for space-constrained layouts where 5.3 mm body width is critical and reflow profile accommodates SSOP. |
| 74LVT620PW,118 | Lower voltage (3.3 V only), non-inverting logic, 20-pin TSSOP; 3.3 ns tPLH, 24 mA output drive. | Not functionally interchangeable due to non-inverting behavior and incompatible supply; requires logic inversion elsewhere. | Choose only if migrating entire system to 3.3 V LVT logic and redesigning enable/control logic to accommodate non-inverting path. |
Compared with SN74ABT620DBR and 74LVT620PW,118, the 74ABT620D,623 uniquely delivers 5 V operation, inverting bidirectional logic, and SO20 packaging in a single device-enabling drop-in replacement in legacy 5 V industrial designs without layout or firmware changes.
Availability
74ABT620D,623 is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory-mapped I/O expansion, and legacy system bus bridging requiring stable component supply over extended product lifecycles.
Supply support for 74ABT620D,623 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, formerly Philips Semiconductors, is a global leader in high-performance logic and interface ICs, with core expertise in BiCMOS process technology and industrial-grade reliability.
The 74ABT620D,623 belongs to the ABT (Advanced BiCMOS Technology) logic family, engineered for high-speed, high-drive 5 V digital systems demanding robust noise immunity and live-insertion capability.
FAQ
What is the logic polarity of the 74ABT620D,623 data path?
The 74ABT620D,623 implements an inverting transceiver: when OEAB is high, An drives the complement of its value onto Bn; when OEBA is low, Bn drives the complement onto An. This is confirmed in the Function Table and Logic Symbol sections of the Philips 1993 datasheet. The 74ABT620D,623 does not support non-inverting operation - polarity inversion is inherent to the device architecture.
Can the 74ABT620D,623 operate at 3.3 V?
No, the 74ABT620D,623 is specified only for 4.5 V to 5.5 V operation per the Recommended Operating Conditions table. At 3.3 V, VIH/VIL thresholds are unmet, propagation delays increase unpredictably, and output drive falls outside specification. For 3.3 V systems, consider the 74LVT620 or 74ALVCH16620, not the 74ABT620D,623.
What is the maximum capacitive load the 74ABT620D,623 can drive reliably?
The 74ABT620D,623 AC characteristics are characterized at CL = 50 pF, and its output drive (+64 mA sink / –32 mA source) supports heavier loads than standard TTL. However, propagation delay increases linearly with load capacitance; for reliable timing at ≤4.8 ns max tPLH, total node capacitance (including trace, stub, and input pins) should remain ≤75 pF. The 74ABT620D,623 is not rated for transmission-line driving beyond this limit.
Does the 74ABT620D,623 support hot-swap operation?
Yes - the 74ABT620D,623 explicitly supports live insertion/extraction per its Features list and is qualified to JEDEC Std 17 for latch-up immunity (>500 mA). Its power-up 3-State behavior ensures outputs remain high-impedance until VCC exceeds 2.1 V, preventing bus contention during hot-plug events. This makes the 74ABT620D,623 suitable for modular backplane systems requiring field-replaceable cards.
Is the 74ABT620D,623 pin-compatible with the 74LS620?
Yes - the 74ABT620D,623 shares identical pinout, function table, and enable polarity with the 74LS620, as verified in Philips' ABT family migration documentation. It replaces the LS version with higher speed (3.1 ns vs ~15 ns), greater drive (±64 mA vs ±8 mA), and improved noise immunity - all while retaining the same 20-pin SO package and logic behavior. The 74ABT620D,623 is a direct functional and physical upgrade.
74ABT620D,623 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74ABT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, 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
74ABT620D,623 FAQ
1.How can I place an order for 74ABT620D,623 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT620D,623 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 74ABT620D,623 reliable?
The price and inventory of 74ABT620D,623 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT620D,623 is usually 5 days.
3.What payment methods are accepted for 74ABT620D,623?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT620D,623 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ABT620D,623?
74ABT620D,623 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT620D,623 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 74ABT620D,623?
For technical support, including 74ABT620D,623 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT620D,623 requirements.
6.How does Aetrix verify that 74ABT620D,623 is sourced from the original manufacturer or authorized distributors?
All 74ABT620D,623 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 74ABT620D,623 meets industry standards.
7.What is the process for return or replacement of 74ABT620D,623?
All 74ABT620D,623 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT620D,623, 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 74ABT620D,623 part is unused and in its original packaging.
Return procedure for 74ABT620D,623:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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