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NXP Semiconductors 74ABT544D,602
- Part No.:
- 74ABT544D,602
- Manufacturer:
- NXP Semiconductors
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74ABT544D,602.pdf
- Description:
- IC TXRX INVERT 5.5V 24SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,658
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Product details
Overview
74ABT544D,602 from Nexperia is an octal latched transceiver with dual-directional 3-state control, combining D-type latch and bus transceiver functions in a single SO24 package. It features separate A-to-B and B-to-A latch enable (LEAB/LEBA) and output enable (OEAB/OEBA) inputs, supports ±64 mA output drive, operates from 4.5 V to 5.5 V, and delivers sub-5 ns propagation delay for high-speed bidirectional data buffering in industrial backplanes and memory interface subsystems.
For engineers reviewing the 74ABT544D,602 datasheet, 74ABT544D,602 pinout, 74ABT544D,602 application, or 74ABT544D,602 equivalent, this device serves as a high-drive, low-skew bidirectional data path controller where independent direction control, live insertion capability, and latch-based data staging are required - especially in legacy TTL-compatible systems requiring robust noise immunity and hot-swap support.
Technical Context
The 74ABT544D,602 implements two independent 8-bit D-type latch banks - one for A-to-B flow and one for B-to-A flow - each with dedicated enable logic. Its BiCMOS architecture enables simultaneous high-speed switching (tPLH/tPHL ≤ 4.7 ns at 5 V) and strong DC output drive (IOL = 64 mA, IOH = −32 mA), while maintaining TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V).
It supports power-up 3-state and power-up reset behavior, includes latch-up protection exceeding 500 mA per JESD78B Class II Level A, and provides ESD robustness per HBM (≥2000 V) and MM (≥200 V) standards - all within its −40 °C to +85 °C industrial temperature range and SO24 (SOT137-1) package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL and CMOS systems without level-shifting. |
| Output Drive | 64 mA sink / −32 mA source - drives heavy capacitive loads and multiple TTL inputs directly. |
| Propagation Delay | ≤ 4.7 ns (A↔B path) - enables reliable operation in >200 MHz data strobe environments. |
| Input Thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V - guarantees noise margin and interoperability with legacy 5 V logic families. |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial-grade embedded control and communications equipment. |
| ESD Protection | HBM ≥ 2000 V, MM ≥ 200 V - withstands handling and board-level electrostatic events without damage. |
| Latch-up Immunity | Exceeds 500 mA per JESD78B Class II Level A - prevents destructive latch-up under transient overvoltage conditions. |
Pinout & Package
74ABT544D,602 is housed in a plastic small outline package (SO24) with 24 leads and 7.5 mm body width (SOT137-1), optimized for surface-mount assembly and thermal dissipation in dense PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LEBA) | B-to-A latch enable input | Active-LOW control that captures B-bus data into B-to-A latches on rising edge. |
| 2 (OEBA) | B-to-A output enable input | Active-LOW signal enabling/disabling B-to-A 3-state outputs independently of latching. |
| 3–10 (A0–A7) | A-side bidirectional I/O | Connects to A-bus; functions as input when receiving from B, output when driving B via latched data. |
| 11 (EAB) | A-to-B enable input | Active-LOW gate controlling transparency or isolation of A-to-B data path. |
| 12 (GND) | Ground reference | Primary 0 V return for all internal circuitry and I/O buffers. |
| 13 (OEAB) | A-to-B output enable input | Active-LOW control for A-to-B 3-state outputs, decoupled from latch timing. |
| 14 (LEAB) | A-to-B latch enable input | Active-LOW signal capturing A-bus data into A-to-B latches on rising edge. |
| 15–22 (B0–B7) | B-side bidirectional I/O | Connects to B-bus; functions as input when receiving from A, output when driving A via latched data. |
| 23 (EBA) | B-to-A enable input | Active-LOW gate controlling transparency or isolation of B-to-A data path. |
| 24 (VCC) | Positive supply | 5 V nominal supply rail powering all internal logic and output drivers. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent latch banks | Enables concurrent A→B and B→A data staging without interference - critical for full-duplex bus arbitration. |
| Separate direction controls | LEAB/OEAB/EAB and LEBA/OEBA/EBA allow granular, asynchronous management of each data path's transparency, latching, and output state. |
| Live insertion/extraction support | Power-up 3-state and controlled I/O leakage (<±100 µA) prevent bus contention during hot-plug operations. |
| High-current 3-state outputs | 64 mA sink capability maintains signal integrity across long traces or multi-drop buses without external drivers. |
| TTL-compatible voltage thresholds | VIL ≤ 0.8 V and VIH ≥ 2.0 V ensure seamless integration with legacy 5 V microcontrollers, FPGAs, and ASICs. |
Applications
| Industrial Backplane Interface | Memory Subsystem Buffering |
|---|---|
Use Scenario: Bidirectional data transfer between CPU and peripheral modules across a shared 8-bit ISA-style backplane with variable load capacitance. IC Role / Device Role / Timing Role: Acts as a direction-controlled, latch-staged buffer isolating CPU address/data bus from peripheral timing skew and loading variations. Use Value: Eliminates need for discrete latches and transceivers; 4.7 ns max propagation delay ensures setup/hold compliance at 20 MHz bus clock rates. | Use Scenario: Interfacing a microcontroller's data bus to dual-port SRAM or flash memory with separate read/write enable timing. IC Role / Device Role / Timing Role: Provides synchronized, direction-gated data path with independent latch control for write-data staging and read-data capture. Use Value: Enables zero-wait-state memory access by latching write data before WR# assertion and holding read data until valid. |
| Legacy System Bus Extender | Hot-Swappable I/O Module Interface |
Use Scenario: Extending a vintage 8-bit microprocessor bus to additional daughterboards while preserving signal integrity and timing margins. IC Role / Device Role / Timing Role: Functions as a transparent or latched repeater with TTL-compatible thresholds and 64 mA drive strength. Use Value: Compensates for trace-length-induced rise-time degradation and fanout limitations without adding timing uncertainty. | Use Scenario: Enabling safe insertion/removal of I/O expansion cards in programmable logic controllers (PLCs) operating in factory-floor environments. IC Role / Device Role / Timing Role: Provides controlled 3-state isolation during card insertion, with power-up reset preventing spurious outputs. Use Value: Meets IEC 61000-4-2 Level 4 ESD immunity requirements and avoids bus glitches during hot-swap events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal latched transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ABT543D,602 | Single-directional (A-to-B only) with no B-to-A latch or control pins; lacks LEBA/OEBA/EBA. | Suitable only for unidirectional buffering; cannot replace bidirectional latching functionality. | Select only if system requires A→B data flow exclusively and space/power constraints favor reduced pin count. |
| SN74ABT544DBR | Same logic function and electrical specs but in SSOP24 (SOT340-1) package; 5.3 mm body width vs. SO24's 7.5 mm. | Requires PCB layout revision due to different footprint and pitch; identical timing and drive performance. | Choose for higher board density where SSOP24 assembly is supported and thermal profile permits. |
Compared with 74ABT544D,602, the 74ABT543D,602 omits half the control logic and bidirectional capability, while SN74ABT544DBR retains full functional equivalence but demands mechanical redesign - making the 74ABT544D,602 optimal for SO24-based industrial designs requiring proven field reliability and drop-in compatibility.
Availability
74ABT544D,602 is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory subsystem buffering, legacy system bus extension, and hot-swappable I/O module designs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for 74ABT544D,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
Nexperia is a global leader in high-performance discrete, logic, and PowerMOS semiconductors, serving automotive, industrial, computing, consumer, and wearable markets with scalable, reliable components.
The 74ABT544D,602 belongs to Nexperia's ABT-series advanced bipolar transistor logic family, engineered for high-speed, high-drive bidirectional data interfacing in noise-sensitive industrial and legacy-compatibility applications.
FAQ
What is the maximum operating frequency supported by the 74ABT544D,602?
The 74ABT544D,602 does not specify a maximum clock frequency directly, but its propagation delay (tPLH/tPHL ≤ 4.7 ns at 5 V) supports reliable operation in systems with bus cycle times ≥ 10 ns - corresponding to effective data rates up to 100 MHz in strobed or handshaked interfaces. Real-world timing must account for setup/hold (tsu(H) = 3.0 ns, th(L) = −1.3 ns) and system-level trace delays.
Does the 74ABT544D,602 support hot-swap or live insertion?
Yes, the 74ABT544D,602 supports live insertion and extraction per its datasheet features. It incorporates power-up 3-state behavior, low I/O leakage current (±100 µA max), and robust ESD protection (HBM ≥ 2000 V), enabling safe connection/disconnection in powered systems without bus contention or damage.
What are the absolute maximum ratings for VCC and input voltage on the 74ABT544D,602?
The 74ABT544D,602 has an absolute maximum VCC of +7.0 V and input voltage (VI) rating of −1.2 V to +7.0 V. Exceeding these values risks permanent damage. Recommended operating VCC is strictly 4.5 V to 5.5 V; operation outside this range may cause unpredictable logic behavior or accelerated wear.
How does the 74ABT544D,602 differ from the 74ABT640 and 74ABT373 in functionality?
The 74ABT544D,602 integrates both 74ABT640 (octal transceiver) and 74ABT373 (octal latch) functions in one device, providing two independent 8-bit latch banks with separate direction controls. Unlike the 74ABT640 (no latching) or 74ABT373 (unidirectional latch only), the 74ABT544D,602 enables true bidirectional latched data flow with full control over enable, latch, and output states per direction.
Is the 74ABT544D,602 pin-compatible with other packages in the same family?
No - the 74ABT544D,602 (SO24/SOT137-1) is not pin-compatible with 74ABT544DB (SSOP24/SOT340-1) or 74ABT544PW (TSSOP24/SOT355-1), despite identical logic function and pin assignment order. Mechanical differences - including body width (7.5 mm vs. 5.3 mm vs. 4.4 mm), lead pitch (1.27 mm vs. 0.65 mm), and thermal pad presence - require distinct PCB footprints and assembly profiles.
74ABT544D,602 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74ABT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- 24-SO
74ABT544D,602 FAQ
1.How can I place an order for 74ABT544D,602 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT544D,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 74ABT544D,602 reliable?
The price and inventory of 74ABT544D,602 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT544D,602 is usually 5 days.
3.What payment methods are accepted for 74ABT544D,602?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT544D,602 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ABT544D,602?
74ABT544D,602 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT544D,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 74ABT544D,602?
For technical support, including 74ABT544D,602 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT544D,602 requirements.
6.How does Aetrix verify that 74ABT544D,602 is sourced from the original manufacturer or authorized distributors?
All 74ABT544D,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 74ABT544D,602 meets industry standards.
7.What is the process for return or replacement of 74ABT544D,602?
All 74ABT544D,602 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT544D,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 74ABT544D,602 part is unused and in its original packaging.
Return procedure for 74ABT544D,602:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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