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onsemi 74ABT2244CMSA
- Part No.:
- 74ABT2244CMSA
- Manufacturer:
- onsemi
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74ABT2244CMSA.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,439
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Product details
Overview
74ABT2244CMSA from Fairchild Semiconductor is an octal non-inverting buffer/line driver with integrated 25Ω series output resistors, designed for driving high-capacitance MOS memory and bus-oriented loads. It operates at 4.5V–5.5V supply, delivers 32mA output drive (IOH), supports 3.9ns max propagation delay, and features dual independent 3-state enables (OE1/OE2) for grouped channel control in address/data bus applications.
For engineers reviewing the 74ABT2244CMSA datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed latchup protection, hot-insertion capability, glitch-free bus loading during power-up/down, and built-in termination eliminating external resistors in high-speed digital interfaces.
Technical Context
The 74ABT2244CMSA implements two independent 4-bit buffered groups (I0–I3/O0–O3 and I4–I7/O4–O7), each controlled by its own active-low output enable (OE1, OE2). Its ABT logic family ensures TTL-compatible input thresholds (VIH = 2.0V, VIL = 0.8V) and fast AC performance across –40°C to +85°C ambient.
Each output integrates a 25Ω series resistor to dampen signal reflections on transmission lines, reducing ringing without requiring PCB-level termination. The device maintains high-impedance outputs during power transitions and withstands ±300mA latchup current per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +4.5V to +5.5V - Ensures compatibility with standard 5V TTL and CMOS systems while maintaining noise margin. |
| Propagation Delay (tPLH/tPHL) | Max 3.9ns at CL = 50pF - Enables reliable operation in high-speed address/data buses up to ~250MHz toggle rate. |
| Output Drive (IOH/IOL) | –32mA / +15mA - Sufficient to drive multiple TTL loads or capacitive traces without external buffers. |
| Input Thresholds | VIH = 2.0V, VIL = 0.8V - Guarantees robust logic level recognition across voltage and temperature variations. |
| Output Series Resistance | 25Ω per output - Integrated termination eliminates need for discrete 22–33Ω resistors in point-to-point or stubbed bus layouts. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded and computing applications with no derating required. |
| Power Supply Current (ICCL) | 30mA max (all outputs LOW) - Predictable dynamic power consumption for thermal budgeting in dense logic designs. |
Pinout & Package
74ABT2244CMSA is housed in a 20-lead Shrink Small Outline Package (SSOP), JEDEC MO-150 compliant, 5.3mm wide, with 0.65mm lead pitch and gull-wing terminations suitable for fine-pitch surface-mount assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | I0–I7 Inputs | Non-inverting data inputs; accept TTL/CMOS logic levels; high-impedance when OE asserted. |
| 9, 19 | OE1, OE2 | Active-low group enables; OE1 controls O0–O3, OE2 controls O4–O7; both must be LOW for output drive. |
| 10, 11, 12, 13, 14, 15, 16, 17 | O0–O7 Outputs | Buffered non-inverting outputs with integrated 25Ω series resistance; enter high-Z when respective OE is HIGH. |
| 20 | VCC | +4.5V to +5.5V supply rail; decoupling capacitor placement near this pin critical for noise suppression. |
| 10 | GND | Ground reference for all inputs, outputs, and internal circuitry; requires low-inductance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25Ω output series resistors | Eliminates external termination components, reduces PCB area, and suppresses overshoot/ringing on 50–75Ω trace environments. |
| Guaranteed latchup protection | Withstands ±300mA latchup current across full operating range, enabling robustness in noisy or hot-swap environments. |
| Glitch-free 3-state during power sequencing | Maintains high-impedance outputs throughout power-up and power-down cycles, preventing bus contention in multi-rail systems. |
| Nondestructive hot-insertion capability | Allows safe insertion/removal while powered - critical for modular backplane and field-replaceable unit (FRU) designs. |
| Dual independent output enables | Enables selective activation of upper/lower 4-bit groups (O0–O3 vs. O4–O7), supporting split-bus or interleaved addressing schemes. |
Applications
| Memory Address Buffering | PCI/ISA Bus Driver |
|---|---|
|
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or EPROM chips on a shared bus. IC Role / Device Role / Timing Role: Non-inverting octal buffer providing fanout and level translation between controller and memory devices. Use Value: Integrated 25Ω resistors reduce signal reflections on long parallel address traces, improving setup/hold timing margins without added BOM cost. |
Use Scenario: Isolating and strengthening control signals (e.g., I/OCHRDY, MEMR, MEMW) in legacy PC expansion slots. IC Role / Device Role / Timing Role: High-drive line driver with 3-state control for bidirectional bus arbitration and load matching. Use Value: 32mA drive strength and sub-4ns propagation delay ensure clean signal edges across full slot length, meeting PCI/ISA timing budgets. |
| Industrial Backplane Interface | Test Equipment Signal Conditioning |
|
Use Scenario: Interfacing FPGA I/O banks to a 20-pin parallel backplane carrying configuration or status data across modules. IC Role / Device Role / Timing Role: Hot-pluggable buffer enabling live module insertion without disrupting active bus traffic. Use Value: Guaranteed latchup immunity and glitch-free power sequencing prevent system lockups during FRU replacement in deployed equipment. |
Use Scenario: Conditioning digital stimulus signals from ATE pattern generators before routing to DUT pins. IC Role / Device Role / Timing Role: Impedance-matched driver stage adding signal integrity margin and isolation between tester and device under test. Use Value: Built-in 25Ω series termination matches typical ATE cabling impedance, minimizing reflected energy and improving edge fidelity at >100MHz rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer/line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT2244DBR | TI version in SSOP-20 (same MSA20 footprint); identical DC/AC specs but different ICCZ (40µA vs. 50µA) and slightly tighter tPZH min (1.4ns). | Same industrial temperature range and 25Ω output resistors; validated for TI-based reference designs using TMS320Cxx DSPs. | Drop-in compatible for TI-centric designs; verify layout clearance for TI's package marking location. |
| 74LVT2244MTCX | ON Semiconductor LVT variant: lower VCC range (2.7–3.6V), higher speed (tPLH max 2.8ns), no integrated 25Ω resistors - requires external termination. | Targeted at 3.3V systems only; unsuitable for 5V bus interfacing without level shifting; used in portable instrumentation where power efficiency is prioritized. | Select only for 3.3V-only designs needing faster timing; not interchangeable without schematic and layout changes. |
Compared with SN74ABT2244DBR and 74LVT2244MTCX, the 74ABT2244CMSA uniquely combines 5V operation, integrated 25Ω termination, and industrial temperature support - making it optimal for legacy 5V backplanes and memory subsystems where board space and reliability outweigh marginal speed gains.
Availability
74ABT2244CMSA is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy bus drivers, and memory address buffering requiring stable component supply and long-term lifecycle assurance.
Supply support for 74ABT2244CMSA 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 leading designer of high-performance analog and logic ICs, acquired by ON Semiconductor in 2016; its ABT logic family remains widely supported in industrial and computing applications.
The 74ABT2244CMSA belongs to Fairchild's ABT (Advanced BiCMOS Technology) logic series, engineered for high-speed 5V TTL-compatible bus interfacing with enhanced noise immunity and robustness in electrically demanding environments.
FAQ
What is the maximum clock frequency supported by the 74ABT2244CMSA?
The 74ABT2244CMSA does not operate on a clock; it is an asynchronous buffer. Its usable data rate is determined by propagation delay (max 3.9ns) and load capacitance. With 50pF load, it reliably supports data toggling up to ~250MHz (1/tPLH), assuming proper signal integrity design. The 74ABT2244CMSA is commonly used in static address/data paths rather than synchronous clock domains.
Does the 74ABT2244CMSA require external pull-up or pull-down resistors on its enable inputs?
No - OE1 and OE2 are active-low TTL-compatible inputs with VIH = 2.0V and VIL = 0.8V, allowing direct connection to standard logic outputs. Pull-up resistors are unnecessary unless floating states must be avoided in unpowered or undriven configurations. The 74ABT2244CMSA's internal input structure ensures defined logic levels without external biasing under normal operation.
Can the 74ABT2244CMSA drive a 50Ω transmission line directly?
Yes - each output integrates a 25Ω series resistor, which-when combined with typical PCB trace impedance (~50Ω)-forms a near-ideal source termination for point-to-point 50Ω lines. This configuration minimizes reflections without requiring external components. The 74ABT2244CMSA is not intended for unterminated stubs or multidrop buses without additional modeling.
Is the 74ABT2244CMSA RoHS-compliant and lead-free?
Yes - the 74ABT2244CMSA is manufactured per JEDEC J-STD-020B for Pb-free packaging. Its SSOP (MSA20) package uses lead-free solderable terminations and complies with RoHS Directive 2011/65/EU. No exemptions apply, and the device carries full material declaration documentation available upon request for the 74ABT2244CMSA.
How does the 74ABT2244CMSA handle power-up sequencing in mixed-voltage systems?
The 74ABT2244CMSA guarantees glitch-free 3-state behavior during power-up and power-down, maintaining high-impedance outputs regardless of VCC ramp rate or sequence relative to input signals. This prevents bus contention when interfacing with partially powered controllers or FPGAs. The 74ABT2244CMSA achieves this via internal power-on reset circuitry tied to VCC monitoring.
74ABT2244CMSA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ABT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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-SSOP
74ABT2244CMSA FAQ
1.How can I place an order for 74ABT2244CMSA through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT2244CMSA 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 74ABT2244CMSA reliable?
The price and inventory of 74ABT2244CMSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT2244CMSA is usually 5 days.
3.What payment methods are accepted for 74ABT2244CMSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT2244CMSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ABT2244CMSA?
74ABT2244CMSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT2244CMSA 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 74ABT2244CMSA?
For technical support, including 74ABT2244CMSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT2244CMSA requirements.
6.How does Aetrix verify that 74ABT2244CMSA is sourced from the original manufacturer or authorized distributors?
All 74ABT2244CMSA 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 74ABT2244CMSA meets industry standards.
7.What is the process for return or replacement of 74ABT2244CMSA?
All 74ABT2244CMSA units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT2244CMSA, 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 74ABT2244CMSA part is unused and in its original packaging.
Return procedure for 74ABT2244CMSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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