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NXP Semiconductors 74ABT244DB,118
- Part No.:
- 74ABT244DB,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74ABT244DB,118.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:20,800
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Product details
Overview
74ABT244DB,118 from Nexperia is an octal 3-state buffer/line driver in SO20 (SOT163-1) package, designed for bidirectional bus interfacing with dual independent output-enable controls (1OE, 2OE). It delivers ±64 mA/–32 mA drive strength, operates from 4.5 V to 5.5 V, supports –40 °C to +85 °C ambient, and features IOFF partial power-down protection. It is used in legacy industrial control backplanes and TTL-compatible data routing systems.
For engineers reviewing the 74ABT244DB,118 datasheet, 74ABT244DB,118 pinout, 74ABT244DB,118 application, or 74ABT244DB,118 equivalent, this page provides verified functional behavior, SO20 pin mapping, static/dynamic timing limits, IOFF leakage specs, and direct TTL-level interface capability - all confirmed from Nexperia's Rev. 5 (24 June 2024) product data sheet.
Technical Context
The 74ABT244DB,118 implements two independent 4-bit non-inverting buffers, each controlled by its own active-low enable (1OE for outputs 1Y0–1Y3; 2OE for 2Y0–2Y3). Its BiCMOS architecture enables high-speed propagation (tPLH/tPHL ≤ 4.6 ns at 5.0 V) while maintaining TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V).
IOFF circuitry ensures outputs enter high-impedance state when VCC = 0 V, limiting backflow current to ±100 μA. The device meets JESD78 Class II latch-up immunity (>500 mA) and ESD robustness per JS-001 (HBM >2000 V) and JS-002 (CDM >1000 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.5 V to 5.5 V - ensures compatibility with 5 V TTL and CMOS logic rails without level-shifting. |
| Output drive | +64 mA / –32 mA - supports driving heavy capacitive loads or multiple TTL inputs directly. |
| Propagation delay | tPLH/tPHL ≤ 4.6 ns @ VCC = 5.0 V - enables reliable operation in sub-100 MHz synchronous bus environments. |
| IOFF leakage | ±100 μA @ VCC = 0 V - prevents damaging back-current during hot-swap or partial system power-down. |
| Operating temperature | –40 °C to +85 °C - qualified for industrial-grade embedded control and instrumentation applications. |
| ESD rating | HBM >2000 V, CDM >1000 V - exceeds JEDEC JS-001/JS-002 requirements for board-level handling robustness. |
| Input threshold | VIH ≥ 2.0 V, VIL ≤ 0.8 V - guarantees unambiguous recognition of standard TTL logic levels. |
Pinout & Package
74ABT244DB,118 is housed in a plastic small outline package (SO20), SOT163-1 variant, with 20 leads and 7.5 mm body width. Pin 1 is marked via notch or bevel; pin 10 is GND; pin 20 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low enable inputs - independently disable Group 1 (pins 12,14,16,18) or Group 2 (pins 3,5,7,9) outputs. |
| 2,4,6,8 | 1A0–1A3 | Group 1 data inputs - routed to corresponding 1Yn outputs when 1OE = LOW. |
| 12,14,16,18 | 1Y0–1Y3 | Group 1 buffered outputs - high-impedance when 1OE = HIGH; otherwise follow 1An states. |
| 11,13,15,17 | 2A0–2A3 | Group 2 data inputs - routed to corresponding 2Yn outputs when 2OE = LOW. |
| 3,5,7,9 | 2Y0–2Y3 | Group 2 buffered outputs - high-impedance when 2OE = HIGH; otherwise follow 2An states. |
| 10 | GND | Ground reference - common return for all I/O and supply currents. |
| 20 | VCC | Positive supply - powers internal BiCMOS circuitry; must be decoupled locally. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 3-state control | Separate 1OE/2OE pins allow selective isolation of two 4-bit data paths on shared bus infrastructure. |
| IOFF partial power-down | Outputs automatically enter high-Z when VCC = 0 V, eliminating risk of backfeed current in mixed-power systems. |
| TTL-level input compatibility | VIH ≥ 2.0 V and VIL ≤ 0.8 V ensure direct connection to legacy 5 V TTL without interface logic. |
| BiCMOS speed-drive balance | Combines bipolar switching speed (≤4.6 ns delay) with CMOS low static power (<250 μA ICC per enabled input). |
| Live insertion support | Robust ESD (HBM >2000 V) and latch-up immunity (>500 mA) permit safe hot-plug into powered backplanes. |
Applications
| Industrial Backplane Interface | Legacy System Bus Expansion |
|---|---|
Use Scenario: Isolating CPU address/data buses from peripheral modules in programmable logic controllers (PLCs) with modular I/O slots. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer enabling time-multiplexed bus sharing between master and slave cards. Use Value: Dual OE control allows independent gating of upper/lower nibbles, reducing contention during multi-module arbitration. |
Use Scenario: Extending ISA or VMEbus signal integrity across long PCB traces in test equipment mainframes. IC Role / Device Role / Timing Role: Line driver compensating for trace capacitance-induced rise/fall time degradation. Use Value: +64 mA drive capability maintains <10 ns edge fidelity up to 100 pF load, preserving setup/hold margins. |
| Embedded Controller Data Routing | TTL-Compatible Logic Translation |
Use Scenario: Interfacing microcontroller GPIOs to external 5 V parallel peripherals (e.g., LCD controllers, ADCs) in medical diagnostic devices. IC Role / Device Role / Timing Role: Level-tolerant buffer isolating 3.3 V MCU I/O from 5 V peripheral signaling domains. Use Value: IOFF protection prevents damage if peripheral remains powered while MCU resets or enters sleep mode. |
Use Scenario: Converting between different 5 V logic families (e.g., 74LS to 74F) in retro-computing restoration projects. IC Role / Device Role / Timing Role: Non-inverting repeater matching fan-out and noise margin requirements across family boundaries. Use Value: Guaranteed VIH/VIL thresholds and ±32 mA sink/source ensure reliable logic level interpretation across TTL variants. |
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); no IOFF circuitry; identical electrical specs except IOFF leakage not specified. | Lacks partial power-down capability - unsuitable for hot-swap or mixed-voltage systems requiring backfeed prevention. | Select only for through-hole prototyping or legacy PDIP-only PCBs where IOFF is not required. |
| 74LVC244APW | 3.3 V only (1.65–3.6 V); lower drive (±24 mA); no IOFF; TSSOP20 package. | Not 5 V tolerant - requires level translation when interfacing with 5 V TTL; incompatible with existing 5 V designs. | Choose only for new 3.3 V systems prioritizing lower power and smaller footprint over 5 V compatibility. |
Compared with SN74ABT244N, 74ABT244DB,118 adds critical IOFF protection for modern modular systems; versus 74LVC244APW, it retains full 5 V TTL interoperability and higher drive strength essential for legacy bus loading.
Availability
74ABT244DB,118 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus expansion, and embedded controller data routing requiring stable component supply across extended lifecycle programs.
Supply support for 74ABT244DB,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
Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74ABT series targets high-speed, 5 V TTL-compatible bus interface applications demanding robust drive strength, precise timing, and industrial temperature operation.
FAQ
What is the maximum allowable output current per pin for 74ABT244DB,118?
The absolute maximum LOW-level output current is 128 mA per pin (per Table 4), but the recommended operating condition specifies IOL = 64 mA maximum for reliable performance across temperature. Exceeding 64 mA risks violating VOL specifications (>0.55 V) and may accelerate wear-out under continuous DC stress.
Does 74ABT244DB,118 support live insertion into a powered backplane?
Yes - it features live insertion capability per datasheet Section 2, enabled by HBM ESD rating >2000 V, JESD78 Class II latch-up immunity (>500 mA), and robust IOFF protection that prevents backfeed current during partial power sequencing. No external protection circuitry is required.
Can 74ABT244DB,118 operate with a 4.2 V supply?
No - the minimum recommended supply voltage is 4.5 V (Table 5). At 4.2 V, VOH drops below guaranteed 2.5 V (see Table 6), increasing risk of false LOW detection by downstream TTL receivers; also, IOFF functionality is not characterized below 4.5 V.
How does the IOFF feature behave when VCC is ramping during power-up?
Per datasheet Section 1, IOFF activates when VCC falls below ~2.1 V and remains active until VCC rises above ~2.1 V (note [1] in Table 6). During power-up, outputs stay in high-Z until VCC crosses this threshold, preventing glitchy transitions or bus contention before internal biasing stabilizes.
74ABT244DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74ABT
- Package/Case:
- 20-SSOP (0.209", 5.30mm 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-SSOP
74ABT244DB,118 FAQ
1.How can I place an order for 74ABT244DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT244DB,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 74ABT244DB,118 reliable?
The price and inventory of 74ABT244DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT244DB,118 is usually 5 days.
3.What payment methods are accepted for 74ABT244DB,118?
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74ABT244DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT244DB,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 74ABT244DB,118?
For technical support, including 74ABT244DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT244DB,118 requirements.
6.How does Aetrix verify that 74ABT244DB,118 is sourced from the original manufacturer or authorized distributors?
All 74ABT244DB,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 74ABT244DB,118 meets industry standards.
7.What is the process for return or replacement of 74ABT244DB,118?
All 74ABT244DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT244DB,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 74ABT244DB,118 part is unused and in its original packaging.
Return procedure for 74ABT244DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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