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NXP Semiconductors 74ABT244D,602
- Part No.:
- 74ABT244D,602
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74ABT244D,602.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:31,703
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Product details
Overview
74ABT244D,602 from Nexperia is an octal 3-state buffer/line driver in SO20 package, operating at 4.5–5.5 V, delivering ±32 mA/±64 mA output drive, with dual independent output enables (1OE, 2OE) for grouped 4-bit control and IOFF protection for partial power-down operation in bus-hold or hot-swap systems.
For engineers reviewing the 74ABT244D,602 datasheet, 74ABT244D,602 pinout, 74ABT244D,602 application, or 74ABT244D,602 equivalent, this device serves as a high-speed TTL-compatible interface buffer for memory address/data buses, microcontroller peripheral expansion, and industrial backplane drivers requiring robust 3-state isolation and live-insertion capability.
Technical Context
The 74ABT244D implements BiCMOS logic architecture to achieve sub-5 ns propagation delays (tPLH/tPHL ≤ 4.6 ns at 5 V), with separate enable inputs (1OE, 2OE) controlling two independent 4-bit output groups (1Y0–1Y3 and 2Y0–2Y3). Each output supports true 3-state behavior with defined OFF-state leakage (IOZ ≤ ±50 μA) and fast enable/disable timing (tPZH/tPLZ ≤ 6.6 ns).
It features IOFF circuitry that disables outputs when VCC = 0 V, limiting backflow current to ≤ ±100 μA, and meets JESD78 Class II latch-up immunity (>500 mA) and ESD robustness per JS-001 (HBM >2000 V) and JS-002 (CDM >1000 V), enabling use in noisy industrial environments.
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 logic rails without level-shifting. |
| Output drive | +64 mA / –32 mA - supports driving heavy capacitive loads (e.g., 50 pF buses) and fan-out to multiple TTL inputs. |
| Propagation delay | tPLH/tPHL ≤ 4.6 ns @ 5 V - enables reliable operation in high-speed digital systems up to ~200 MHz data rates. |
| IOFF leakage | ≤ ±100 μA @ VCC = 0 V - prevents damaging back-current during partial power-down or hot-swap events. |
| Operating temperature | –40 °C to +85 °C - qualified for industrial-grade embedded control and automation equipment. |
| ESD rating | HBM >2000 V, CDM >1000 V - withstands handling and board-level electrostatic discharge in manufacturing and field service. |
| Input threshold | VIL ≤ 0.8 V, VIH ≥ 2.0 V - guarantees unambiguous recognition of TTL-level inputs across full voltage and temperature range. |
Pinout & Package
74ABT244D,602 uses the SO20 (SOT163-1) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, gull-wing leads, JEDEC MS-013 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-LOW enable inputs - each controls four corresponding outputs (1Yn or 2Yn); HIGH forces high-impedance state. |
| 2, 4, 6, 8 | 1A0–1A3 | Group 1 input data lines - routed to outputs 1Y0–1Y3 when 1OE = LOW. |
| 11, 13, 15, 17 | 2A0–2A3 | Group 2 input data lines - routed to outputs 2Y0–2Y3 when 2OE = LOW. |
| 12, 14, 16, 18 | 1Y0–1Y3 | Group 1 buffered 3-state outputs - driven by 1A0–1A3 only when 1OE = LOW. |
| 3, 5, 7, 9 | 2Y0–2Y3 | Group 2 buffered 3-state outputs - driven by 2A0–2A3 only when 2OE = LOW. |
| 10 | GND | Ground reference - common return path for all I/O and supply currents. |
| 20 | VCC | Positive supply - powers internal BiCMOS circuitry; must be decoupled locally with 100 nF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Enables <5 ns propagation delay while sustaining ±64 mA output sink/source capability at 5 V. |
| Dual independent 3-state enables | Allows selective isolation of two 4-bit data paths - critical for bidirectional bus arbitration and multiplexed memory interfaces. |
| IOFF partial power-down protection | Prevents destructive back-current flow when VCC is removed but I/O pins remain active - essential for hot-plug and power sequencing designs. |
| Live insertion capability | Guaranteed safe insertion into powered backplanes due to controlled input/output clamping and low IOFF leakage. |
| Latch-up immunity | Exceeds 500 mA per JESD78 Class II - eliminates risk of destructive latch-up under transient overvoltage or ESD stress. |
Applications
| Memory Address Buffering | Microcontroller Peripheral Expansion |
|---|---|
|
Use Scenario: Driving 16-bit address bus from a microcontroller to multiple SRAM or Flash devices on a shared PCB trace. IC Role / Device Role / Timing Role: Acts as a non-inverting 3-state buffer with group-selectable output enables to isolate memory banks during read/write cycles. Use Value: Delivers <4.6 ns propagation delay and ±64 mA drive to maintain signal integrity across 10 cm traces loaded with 30 pF, eliminating timing skew between address bits. |
Use Scenario: Expanding GPIO count of an ARM Cortex-M0+ MCU to drive eight discrete LEDs and four pushbutton inputs via shared I/O lines. IC Role / Device Role / Timing Role: Functions as a bidirectional I/O expander using 1OE/2OE to time-multiplex input sampling and output driving on same pins. Use Value: Enables deterministic 3-state control with <6.6 ns enable-to-output delay, preventing bus contention during state transitions in real-time firmware. |
| Industrial Backplane Interface | Legacy Bus Signal Conditioning |
|
Use Scenario: Interfacing a modern FPGA-based controller to legacy 5 V parallel I/O modules in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Serves as a level-consistent, high-drive buffer between FPGA I/O banks and 5 V TTL-compatible backplane slots. Use Value: Provides +64 mA sink capability to meet legacy module input current requirements while maintaining <5 ns timing margin for 20 MHz bus clocks. |
Use Scenario: Replacing aging 74LS244 buffers in repair of vintage test equipment where signal rise/fall times degraded due to aging components. IC Role / Device Role / Timing Role: Functions as a drop-in performance upgrade with identical pinout and logic function, but improved speed and drive strength. Use Value: Restores original system timing margins with tPLH/tPHL ≤ 4.6 ns (vs. 15–25 ns for LS variants), reducing setup/hold violations on 8 MHz control buses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT244N | Dual in-line package (PDIP-20), wider body (6.35 mm), higher thermal resistance (θJA ≈ 70 °C/W vs. 55 °C/W for SO20), no IOFF specification. | Suitable for through-hole prototyping or legacy board rework; lacks partial power-down support required for hot-swap systems. | Select when manual soldering or socket-based testing is needed; avoid in new surface-mount industrial designs requiring IOFF. |
| 74LVC244APW | 3.3 V only (1.65–3.6 V), lower drive (±24 mA), smaller TSSOP20 package (4.4 mm width), no IOFF, HBM ESD = 2000 V (same rating but different test condition). | Designed for mixed-voltage 3.3 V systems; incompatible with 5 V buses without level translation. | Choose only for 3.3 V domains; not a functional substitute for 5 V operation or legacy TTL interfacing. |
Compared with SN74ABT244N and 74LVC244APW, the 74ABT244D,602 uniquely combines 5 V operation, SO20 surface-mount reliability, dual-group 3-state control, and certified IOFF protection - making it the sole option among these three for industrial hot-swap backplanes requiring guaranteed zero-backflow during power sequencing.
Availability
74ABT244D,602 is available at Aetrix Electronics and suitable for memory buffering, microcontroller I/O expansion, industrial backplane interfacing, and legacy bus signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74ABT244D,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 semiconductor expert focused on high-volume, high-reliability logic, analog, and MOSFET solutions, serving automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.
The 74ABT series targets high-speed, 5 V TTL-compatible digital interface applications - designed specifically for robust bus buffering, level translation, and signal integrity preservation in noise-prone industrial control and instrumentation systems.
FAQ
Is 74ABT244D,602 compatible with 3.3 V logic inputs?
No - the 74ABT244D,602 is specified only for 4.5–5.5 V VCC operation and requires VIH ≥ 2.0 V for HIGH recognition. While 3.3 V signals may register as HIGH under nominal conditions, they fall outside guaranteed switching thresholds across temperature and voltage tolerances, risking metastability or increased static current. Use level translators for 3.3 V → 5 V interfacing.
Does 74ABT244D,602 support hot-swap insertion into a live 5 V backplane?
Yes - its IOFF circuitry limits backflow current to ≤ ±100 μA when VCC = 0 V, and its live insertion capability is validated per datasheet. However, mechanical design must ensure GND makes contact before VCC and I/O pins, and local decoupling must be present on the target board to absorb transient currents during insertion.
What is the maximum capacitive load this device can drive reliably?
The 74ABT244D,602 is characterized up to 50 pF load capacitance in dynamic tests (Table 9), with tPLH/tPHL ≤ 4.6 ns at 5 V. For loads exceeding 50 pF, propagation delay increases linearly (~0.02 ns/pF), and output rise/fall times degrade; derating is required beyond 100 pF to maintain timing margins in synchronous systems.
Can both output enable inputs (1OE and 2OE) be tied together for single 8-bit operation?
Yes - connecting 1OE and 2OE simplifies control to a single 3-state enable signal, converting the device into a unified 8-bit buffer. This configuration is explicitly supported in the functional description and does not affect timing, drive strength, or reliability; however, it forfeits independent control of the two 4-bit groups.
74ABT244D,602 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74ABT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- 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
74ABT244D,602 FAQ
1.How can I place an order for 74ABT244D,602 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT244D,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 74ABT244D,602 reliable?
The price and inventory of 74ABT244D,602 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT244D,602 is usually 5 days.
3.What payment methods are accepted for 74ABT244D,602?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT244D,602 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ABT244D,602?
74ABT244D,602 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT244D,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 74ABT244D,602?
For technical support, including 74ABT244D,602 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT244D,602 requirements.
6.How does Aetrix verify that 74ABT244D,602 is sourced from the original manufacturer or authorized distributors?
All 74ABT244D,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 74ABT244D,602 meets industry standards.
7.What is the process for return or replacement of 74ABT244D,602?
All 74ABT244D,602 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT244D,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 74ABT244D,602 part is unused and in its original packaging.
Return procedure for 74ABT244D,602:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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