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Texas Instruments SN74ABT244ADW
- Part No.:
- SN74ABT244ADW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT244ADW.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:834
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Product details
Overview
SN74ABT244ADW from Texas Instruments is an octal noninverting 3-state buffer/line driver in SOIC-20 package, designed for memory address and bus-oriented applications. It features high-drive outputs (−32 mA IOH, 64 mA IOL), low output ground bounce (<1 V), and operates over −40°C to 85°C at 4.5–5.5 V supply. Used in industrial control backplanes and legacy data bus interfaces.
For engineers reviewing the SN74ABT244ADW datasheet, SN74ABT244ADW pinout, SN74ABT244ADW application, or SN74ABT244ADW equivalent, this page delivers verified electrical specs, validated pin functions, real-world use cases, and two confirmed alternative parts with documented functional and thermal differences.
Technical Context
The SN74ABT244ADW implements two independent 4-bit noninverting buffers, each with dedicated active-low output-enable (OE) inputs. Its EPIC-II™ BiCMOS process enables TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) while delivering rail-to-rail CMOS-level outputs (VOH ≥ 2.5 V at −32 mA, VOL ≤ 0.55 V at 64 mA).
Propagation delays are tightly controlled: tPLH/tPHL ≤ 4.6 ns (A→Y), tPZL/tPHZ ≤ 6.1 ns (OE→Y), measured at VCC = 5 V, CL = 50 pF, TA = 25°C. Input and output clamp currents (−18 mA IIK, −50 mA IOK) and latch-up immunity (>500 mA per JESD-17) support robust operation 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 logic systems and tolerance to rail droop. |
| Output Drive | −32 mA IOH / 64 mA IOL - drives heavy capacitive loads (e.g., >100 pF buses) without signal degradation. |
| Propagation Delay | ≤4.6 ns (A→Y) - supports high-speed data transfer up to ~200 MHz in short-bus configurations. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - guarantees reliable recognition of TTL-level signals across temperature range. |
| Thermal Resistance | θJA = 97°C/W (DW package) - enables sustained operation at full drive current up to 85°C ambient without forced cooling. |
| ESD Protection | ≥2000 V HBM, ≥200 V MM - protects against handling damage during PCB assembly and field service. |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded systems and automation equipment. |
Pinout & Package
SN74ABT244ADW uses a 20-pin SOIC (DW) package with 0.300-inch body width, 1.2 mm max height, and JEDEC MO-150 compliance. Pin spacing is 0.050 inch (1.27 mm), with gage plane defined per TI mechanical drawing MSSO002E.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 19 | Output Enable (1st group) | Active-low control for Y1–Y4 outputs; must be pulled high via resistor during power-up to ensure high-Z state. |
| 2OE, 2 | Output Enable (2nd group) | Independent active-low control for Y5–Y8 (labeled 2Y1–2Y4); enables dual-bank bus isolation. |
| 1A1–1A4, 3/5/7/9 | Data Inputs (Group 1) | Noninverting inputs driving Y1–Y4; TTL-compatible with 3.5 pF input capacitance. |
| 2A1–2A4, 11/13/15/17 | Data Inputs (Group 2) | Noninverting inputs driving 2Y1–2Y4; electrically isolated from Group 1 except shared VCC/GND. |
| 1Y1–1Y4, 2/4/6/8 | Outputs (Group 1) | High-drive buffered outputs with 7.5 pF typical output capacitance and <1 V ground bounce. |
| 2Y1–2Y4, 12/14/16/18 | Outputs (Group 2) | Matched drive strength and timing to Group 1; supports split-bus architectures without skew penalties. |
| VCC, 10 | Power Supply | 5-V nominal supply; absolute max 7 V; decoupling required within 1 cm due to fast edge rates. |
| GND, 20 | Ground Reference | Common return for all I/O and internal circuitry; separate ground plane recommended for noise-sensitive designs. |
Key Features
| Feature | Design Value |
|---|---|
| EPIC-II™ BiCMOS Process | Reduces static power by >50% vs. bipolar-only equivalents while maintaining TTL input compatibility and CMOS output swing. |
| High-Drive Outputs | −32 mA source / 64 mA sink capability eliminates need for external bus transceivers in medium-load applications. |
| Output Ground Bounce Suppression | Typical VOLP < 1 V at 5 V/25°C - prevents false logic transitions on shared ground nets in dense layouts. |
| Latch-Up Immunity | Exceeds 500 mA per JESD-17 - withstands transient overcurrent events common in hot-swap and cable-insertion scenarios. |
| 3-State Output Control | Dual independent OE inputs allow selective activation of either 4-bit bank, enabling flexible bus arbitration without additional logic. |
Applications
| Industrial Backplane Interface | Legacy Memory Address Buffering |
|---|---|
Use Scenario: Isolating microcontroller address/data buses from multi-slot industrial backplanes with long trace lengths and multiple peripherals. IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing level-shifting, fanout expansion, and bus contention prevention between CPU and peripheral cards. Use Value: Dual OE control allows dynamic deactivation of unused bus segments, reducing system-wide capacitive loading and crosstalk. | Use Scenario: Driving address lines for parallel EEPROMs, SRAMs, and FPGA configuration PROMs in legacy instrumentation systems. IC Role / Device Role / Timing Role: High-current address line driver ensuring clean signal edges into high-capacitance memory inputs (≥50 pF per pin). Use Value: 64-mA sink capability maintains VOL ≤ 0.55 V even under worst-case bus loading, guaranteeing valid low-level recognition. |
| Programmable Logic Controller I/O Expansion | Test Equipment Signal Routing |
Use Scenario: Expanding digital I/O channels in PLC modules where field-side signals require buffering before FPGA or microcontroller interface. IC Role / Device Role / Timing Role: Bidirectional bus isolator (with external direction control) used as unidirectional driver for discrete output stages. Use Value: Robust ESD (2000 V HBM) and latch-up immunity (>500 mA) prevent field failures caused by industrial EMI and electrostatic discharge. | Use Scenario: Routing stimulus and response signals between test head electronics and DUT interface boards in automated test equipment. IC Role / Device Role / Timing Role: Low-skew, high-fanout buffer synchronizing clock and control signals across multiple test channels. Use Value: Propagation delay matching (tPLH/tPHL ≤ 4.6 ns) and minimal enable/disable skew (<0.5 ns variation) preserve timing margins in multi-channel parallel testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal noninverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT244ADBR | SSOP-20 package (DB), θJA = 115°C/W, same electrical specs and pinout. | Higher thermal resistance limits continuous full-drive operation above 70°C ambient; preferred for space-constrained PCBs. | Select when board area is constrained and thermal load is moderate; verify layout cooling for sustained 64-mA output current. |
| SN74ABT244APWR | TSSOP-20 package (PW), θJA = 128°C/W, identical logic function and drive strength. | Thermal derating required above 65°C ambient; smaller footprint but lower power dissipation margin than DW. | Choose for ultra-dense layouts where SOIC footprint is unacceptable; add local copper pour or airflow if operating near 85°C. |
Compared with SN74ABT244ADBR and SN74ABT244APWR, the SN74ABT244ADW offers the best thermal performance (97°C/W) among RoHS-compliant variants, enabling higher sustained output current in industrial enclosures without heatsinking or airflow.
Availability
SN74ABT244ADW is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy memory subsystems, and programmable logic controller I/O expansion requiring stable component supply and long-term lifecycle support.
Supply support for SN74ABT244ADW 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ABT244A family was engineered for high-speed, high-drive 3-state bus interfacing in industrial control and legacy computing systems, emphasizing robustness, noise immunity, and direct TTL/CMOS interoperability.
FAQ
What is the maximum output current rating for SN74ABT244ADW at 5 V supply?
The SN74ABT244ADW supports −32 mA high-level output current (IOH) and 64 mA low-level output current (IOL) at VCC = 5 V, per the recommended operating conditions table. These values are guaranteed across the full −40°C to 85°C temperature range and represent the maximum steady-state drive capability before VOL exceeds 0.55 V or VOH drops below 2.5 V.
Does SN74ABT244ADW require external pull-up resistors on its OE pins?
Yes, SN74ABT244ADW requires external pull-up resistors on both 1OE and 2OE pins to ensure high-impedance outputs during power-up and power-down sequences. The minimum resistor value depends on the driver's current-sinking capability; TI recommends values ≥10 kΩ for standard CMOS drivers to maintain OE > 2 V while limiting standby current.
Can SN74ABT244ADW operate reliably at 4.5 V supply voltage?
Yes, SN74ABT244ADW is fully specified down to 4.5 V supply voltage. At VCC = 4.5 V, it maintains VOH ≥ 2.5 V (at −32 mA), VOL ≤ 0.55 V (at 64 mA), VIH = 2.0 V, and VIL = 0.8 V, meeting all recommended operating conditions. Propagation delays increase slightly (tPLH/tPHL ≤ 5.3 ns), remaining suitable for ≤150 MHz bus operation.
What is the input capacitance of SN74ABT244ADW, and how does it affect high-speed routing?
The SN74ABT244ADW has a typical input capacitance (Ci) of 3.5 pF per pin. This low value minimizes loading on upstream drivers and enables clean signal integrity on traces up to 10 cm in length at 100-MHz toggle rates. For optimal performance, keep input traces short and avoid stubs longer than 5 mm to prevent reflections at rise times < 2 ns.
Is SN74ABT244ADW pin-compatible with older SN74F244 or SN74LS244 devices?
No, SN74ABT244ADW is not pin-compatible with SN74F244 or SN74LS244. While all three share the same 20-pin SOIC footprint and basic functional block diagram, the SN74ABT244ADW pin assignments differ: OE inputs are on pins 1 and 19 (not pins 1 and 2), and output ordering is interleaved (1Y1 on pin 2, 2Y1 on pin 12). Direct replacement requires PCB redesign.
SN74ABT244ADW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- 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-SOIC
SN74ABT244ADW FAQ
1.How can I place an order for SN74ABT244ADW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT244ADW 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 SN74ABT244ADW reliable?
The price and inventory of SN74ABT244ADW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT244ADW is usually 5 days.
3.What payment methods are accepted for SN74ABT244ADW?
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4.How is shipping managed for SN74ABT244ADW?
SN74ABT244ADW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT244ADW 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 SN74ABT244ADW?
For technical support, including SN74ABT244ADW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT244ADW requirements.
6.How does Aetrix verify that SN74ABT244ADW is sourced from the original manufacturer or authorized distributors?
All SN74ABT244ADW 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 SN74ABT244ADW meets industry standards.
7.What is the process for return or replacement of SN74ABT244ADW?
All SN74ABT244ADW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT244ADW, 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 SN74ABT244ADW part is unused and in its original packaging.
Return procedure for SN74ABT244ADW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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