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onsemi 74ABT2244CMTCX
- Part No.:
- 74ABT2244CMTCX
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74ABT2244CMTCX.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,627
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Product details
Overview
74ABT2244CMTCX from Fairchild Semiconductor is an octal non-inverting buffer/line driver with integrated 25Ω series output resistors, designed for driving capacitive bus loads in memory, address, and clock distribution systems. It operates at 4.5V–5.5V, delivers 32mA HIGH-drive and 15mA LOW-drive, and features true 3-state outputs controlled by dual active-low enables (OE1/OE2). It supports industrial temperature range (–40°C to +85°C) and is qualified for hot-insertion.
For engineers reviewing the 74ABT2244CMTCX datasheet, pinout, applications, or equivalent options, key selection criteria include output series resistance value, propagation delay (≤3.9 ns), 3-state enable/disable timing, latchup immunity, and TSSOP-20 package compatibility with high-density PCB layouts.
Technical Context
The 74ABT2244CMTCX implements two independent 4-bit buffer sections (I0–I3/O0–O3 and I4–I7/O4–O7), each controlled by a dedicated active-low output enable (OE1, OE2). Its ABT logic family delivers TTL-compatible input thresholds (VIH = 2.0V, VIL = 0.8V) and rail-to-rail output swing under load.
Each output integrates a 25Ω series resistor to dampen transmission-line ringing without external components, reducing board-level EMI and simplifying layout for high-speed bus interfaces. The device maintains high-impedance, glitch-free bus loading across full power-up/down cycles and supports nondestructive hot insertion per JEDEC JESD78.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +4.5V to +5.5V - Ensures compatibility with standard 5V TTL/CMOS systems and noise margin robustness. |
| Propagation Delay (tPLH/tPHL) | Max 3.9 ns @ CL = 50pF - Enables reliable operation in sub-5ns timing-critical address/data buses. |
| Output Drive (IOH/IOL) | –32mA / +15mA - Sufficient to drive multiple CMOS inputs or moderate-capacitance transmission lines directly. |
| Integrated Series Resistor | 25Ω per output - Eliminates need for discrete series termination resistors on PCB traces. |
| 3-State Enable/Disable Time | tPZH ≤ 6.0 ns, tPHZ ≤ 5.8 ns - Supports fast bus arbitration and dynamic bus sharing in multiprocessor systems. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded control and communications equipment. |
Pinout & Package
74ABT2244CMTCX is packaged in a 20-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4mm wide, with 0.65mm lead pitch and exposed pad not present. Pinout follows standard 20-pin TSSOP configuration with dual 4-bit sections.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low output enable inputs - Independently disable top/bottom 4-bit sections to isolate bus segments. |
| 2–5, 13–16 | I0–I3, I4–I7 | Data inputs - Accept TTL/CMOS logic levels; VIH ≥ 2.0V, VIL ≤ 0.8V ensures noise-immune switching. |
| 6–9, 17–20 | O0–O3, O4–O7 | Outputs with 25Ω series resistance - Provide controlled edge rates and reduce overshoot/ringing on PCB traces. |
| 10 | GND | Ground reference - Required for stable logic thresholds and low-impedance return path for output currents. |
| 20 | VCC | Positive supply - Must be decoupled locally (0.1µF ceramic) to suppress switching noise coupling into logic core. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25Ω output series resistors | Eliminates external termination components, reduces BOM count, and improves signal integrity on FR4 traces up to 10 cm. |
| Guaranteed latchup protection | Withstands ±300mA latchup current across operating range - prevents destructive failure during transient overvoltage events. |
| Glitch-free 3-state during power sequencing | Maintains high-impedance state throughout entire VCC ramp-up/down - avoids bus contention in hot-swap or partial-power-down systems. |
| Nondestructive hot-insertion capability | Validated per JEDEC JESD78 - allows safe insertion/removal while backplane or motherboard remains powered. |
Applications
| Memory Address Buffering | PCI/ISA Bus Transceiver Interface |
|---|---|
Use Scenario: Driving address lines from microcontroller to multiple SRAM or Flash devices on shared bus. IC Role / Device Role / Timing Role: Non-inverting octal buffer with 25Ω series termination, providing clean, low-skew address propagation. Use Value: Integrated 25Ω resistors suppress reflections on parallel address traces, eliminating need for 8 discrete 22–33Ω resistors and saving 16 mm² PCB area. | Use Scenario: Isolating and level-shifting control signals between PCI slot and host bridge logic. IC Role / Device Role / Timing Role: Dual-enable 3-state line driver enabling dynamic bus ownership handoff between master and peripheral. Use Value: Sub-6ns enable/disable times allow precise bus turnaround control, meeting PCI 33 MHz setup/hold timing margins. |
| High-Speed Clock Distribution | Industrial Backplane Signal Conditioning |
Use Scenario: Distributing system clock to multiple FPGA configuration or ADC sampling clocks. IC Role / Device Role / Timing Role: Low-jitter, low-propagation-delay buffer with matched trace-length drive capability. Use Value: 25Ω series resistance damps clock edge ringing, preserving <100ps rise/fall time integrity and reducing EMI emissions by >6dB. | Use Scenario: Driving long, unterminated backplane traces in programmable logic controllers or motion controllers. IC Role / Device Role / Timing Role: Robust octal driver with hot-swap support and latchup immunity for field-replaceable modules. Use Value: Guaranteed nondestructive hot insertion allows module replacement without powering down entire rack - critical for 24/7 industrial uptime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT2244DBR | TI SOIC-20 package (M20B); no integrated 25Ω resistors - requires external series termination. | Lacks built-in damping; suitable only when board-level termination is already implemented or preferred. | Select if legacy SOIC footprint reuse is required and external resistor placement is acceptable. |
| 74LVT2244PW,118 | Nexperia TSSOP-20; LVT family - lower VCC range (2.7–3.6V), higher speed (tPD ≤ 2.8 ns), no integrated resistors. | Designed for 3.3V systems; incompatible with 5V buses unless level-shifted; no inherent ringing suppression. | Choose for 3.3V-only designs needing faster propagation but accepting added termination complexity. |
Compared with SN74ABT2244DBR and 74LVT2244PW,118, the 74ABT2244CMTCX uniquely combines 5V operation, TSSOP-20 compactness, and factory-integrated 25Ω termination - reducing design iteration time and improving first-pass signal integrity on dense 5V backplanes.
Availability
74ABT2244CMTCX is available at Aetrix Electronics and suitable for industrial control systems, memory subsystems, and legacy bus interface designs requiring stable component supply and long-term obsolescence management.
Supply support for 74ABT2244CMTCX 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in analog, power, and logic ICs before its acquisition by ON Semiconductor in 2016; its ABT logic family remains widely deployed in industrial and telecom infrastructure.
The 74ABT2244 product line targets high-reliability 5V bus buffering applications where signal integrity, hot-swap capability, and latchup immunity are critical - especially in memory expansion, backplane interconnect, and legacy computing systems.
FAQ
What is the function of the 25Ω series resistors in the 74ABT2244CMTCX outputs?
The 25Ω series resistors in each output of the 74ABT2244CMTCX provide controlled impedance matching to typical PCB trace impedances (≈50–75Ω), reducing signal reflections, overshoot, and EMI. This eliminates the need for eight discrete surface-mount resistors in bus-driving applications, simplifying layout and improving first-pass signal integrity without external components.
Does the 74ABT2244CMTCX support hot-plug insertion?
Yes, the 74ABT2244CMTCX supports nondestructive hot-insertion per JEDEC JESD78. Its input and output structures are designed to withstand voltage transients during live insertion, and its guaranteed latchup protection (±300mA) prevents damage when powered into a live backplane - making it suitable for modular industrial systems requiring field-replaceable cards.
What is the maximum output drive capability of the 74ABT2244CMTCX?
The 74ABT2244CMTCX provides –32mA output sink current (IOL) at VOL ≤ 0.8V and +15mA output source current (IOH) at VOH ≥ 2.0V under VCC = 5.0V. This drive strength supports fanout to multiple CMOS loads or direct driving of moderate-capacitance traces up to ~20pF per output, consistent with its role as a bus-oriented line driver.
How does the dual output enable (OE1/OE2) architecture benefit system design with the 74ABT2244CMTCX?
The dual active-low enables (OE1 for O0–O3, OE2 for O4–O7) in the 74ABT2244CMTCX allow independent control of two 4-bit bus segments. This enables selective isolation - for example, disabling one half of the bus during DMA transfers while keeping the other active - reducing contention, lowering dynamic power, and supporting flexible memory-mapped peripheral partitioning in embedded systems.
Is the 74ABT2244CMTCX compatible with 3.3V logic inputs?
No, the 74ABT2244CMTCX is a 5V-only device with TTL-compatible input thresholds (VIH = 2.0V min, VIL = 0.8V max) and requires VCC = 4.5–5.5V. While 3.3V logic HIGH may register as valid (≥2.0V), it violates recommended operating conditions and risks marginal noise immunity. For mixed-voltage systems, level translation or a 3.3V-compatible alternative like 74LVT2244 should be used instead of relying on the 74ABT2244CMTCX.
74ABT2244CMTCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ABT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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, 15mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74ABT2244CMTCX FAQ
1.How can I place an order for 74ABT2244CMTCX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT2244CMTCX 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 74ABT2244CMTCX reliable?
The price and inventory of 74ABT2244CMTCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT2244CMTCX is usually 5 days.
3.What payment methods are accepted for 74ABT2244CMTCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT2244CMTCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ABT2244CMTCX?
74ABT2244CMTCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT2244CMTCX 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 74ABT2244CMTCX?
For technical support, including 74ABT2244CMTCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT2244CMTCX requirements.
6.How does Aetrix verify that 74ABT2244CMTCX is sourced from the original manufacturer or authorized distributors?
All 74ABT2244CMTCX 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 74ABT2244CMTCX meets industry standards.
7.What is the process for return or replacement of 74ABT2244CMTCX?
All 74ABT2244CMTCX units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT2244CMTCX, 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 74ABT2244CMTCX part is unused and in its original packaging.
Return procedure for 74ABT2244CMTCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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