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Texas Instruments SN74F244DB
- Part No.:
- SN74F244DB
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74F244DB.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,005
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Product details
Overview
SN74F244DB from Texas Instruments is an octal noninverting 3-state buffer/line driver IC designed for memory address and bus driving in TTL-compatible systems. It features two independent 4-bit channels, active-low output-enable (OE) control per channel, 5 V nominal supply operation, and 0°C to 70°C industrial temperature range. It drives high-capacitance bus lines in legacy computing and industrial control backplanes.
For engineers reviewing the SN74F244DB datasheet, SN74F244DB pinout, SN74F244DB application, or SN74F244DB equivalent, this page delivers verified electrical specs, SSOP-20 package layout, functional role in address/data buffering, and validated drop-in alternatives for legacy system maintenance and redesign.
Technical Context
The SN74F244DB implements dual 4-bit noninverting buffers with symmetrical active-low OE inputs - 1OE controls Y1–Y4 outputs from A1–A4 inputs, and 2OE controls Y1–Y4 outputs from A1–A4 inputs on the second group. Each output enters high-impedance state when its respective OE is high.
It uses standard F-series TTL logic architecture with Schottky-clamped transistors for improved speed and noise immunity. Propagation delay is 1.7–6.5 ns (A→Y), and output drive capability reaches 64 mA low-level sink current at VCC = 4.5 V, supporting direct connection to terminated 50 Ω transmission lines or multiple TTL loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | F-series TTL - ensures compatibility with legacy 74F, 74LS, and 74S systems without level-shifting. |
| Supply Voltage | 4.5 V to 5.5 V - operates reliably across standard 5 V rail tolerances in industrial power supplies. |
| Output Drive | 64 mA sink / −15 mA source - sufficient to drive 10+ TTL loads or 50 Ω transmission lines directly. |
| Propagation Delay | 1.7–6.5 ns (A→Y) - enables reliable operation up to ~100 MHz bus clocking in short-trace applications. |
| Operating Temp | 0°C to 70°C - qualified for commercial and industrial embedded environments, not extended/military range. |
| Package | SSOP-20 (DB), 7.5 mm × 5.6 mm - 50% PCB area reduction vs. SOIC-20, compatible with fine-pitch reflow assembly. |
| 3-State Control | Active-low OE per 4-bit group - allows independent enable/disable of upper/lower nibble for time-multiplexed bus access. |
Pinout & Package
SN74F244DB is housed in a 20-pin Shrink Small-Outline Package (SSOP-20, DB), measuring 7.5 mm × 5.6 mm with 0.65 mm lead pitch and maximum height of 2.0 mm. The package supports automated placement and reflow soldering per IPC-7351 land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (1OE) | Channel 1 Output Enable | Active-low control for Y1–Y4 outputs; pulls all four outputs to high-Z when high. |
| 2–5 (1A1–1A4) | Channel 1 Inputs | Noninverting data inputs feeding Y1–Y4; TTL-compatible voltage thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V). |
| 6, 19 (GND, VCC) | Power Supply | Ground and +5 V supply pins placed diagonally to minimize supply loop inductance. |
| 7–10 (2Y1–2Y4) | Channel 2 Outputs | Noninverting buffered outputs from 2A1–2A4; 3-state capable with 2OE. |
| 11–14 (2A1–2A4) | Channel 2 Inputs | Second 4-bit input group, electrically isolated from Channel 1 except shared VCC/GND. |
| 15 (2OE) | Channel 2 Output Enable | Independent active-low enable for Y1–Y4 of second buffer group. |
| 16–18, 20 (1Y1–1Y4) | Channel 1 Outputs | Outputs corresponding to 1A1–1A4; high-impedance when 1OE = high. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit buffers | Enables time-multiplexed or parallel addressing of two memory banks or peripheral groups without external gating. |
| 3-State outputs with separate OE | Eliminates bus contention in multi-driver systems; each channel can be disabled independently during data arbitration. |
| SSOP-20 footprint | Reduces PCB area by >50% vs. SOIC-20 while maintaining identical pin count and I/O functionality for drop-in layout reuse. |
| TTL-compatible input thresholds | Direct interface with 74LS, 74F, and microcontroller GPIOs without level shifters or pull-ups. |
| High-speed propagation (1.7 ns min) | Supports synchronous bus timing in 25–50 MHz legacy CPU designs where setup/hold margins are tight. |
Applications
| Memory Address Buffering | Legacy Bus Transceiver Interface |
|---|---|
Use Scenario: Driving 16-bit address bus from microprocessor to multiple memory chips in industrial PLC mainboards. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address outputs from capacitive bus load; enables address decoding before memory access. Use Value: Prevents signal degradation over 10+ inch traces; supports simultaneous enable of multiple memory devices via OE control. | Use Scenario: Interfacing Z80 or 8086 CPU data/address buses to peripheral controllers in retro-computing restoration projects. IC Role / Device Role / Timing Role: Bidirectional bus driver (with companion SN74F245) providing direction-controlled signal isolation and fanout expansion. Use Value: Maintains TTL logic levels across long backplane runs; eliminates ground bounce via controlled output impedance. |
| Industrial Backplane Signal Conditioning | Test Equipment Digital I/O Expansion |
Use Scenario: Level-shifting and buffering digital control signals across modular rack-mounted instrumentation chassis. IC Role / Device Role / Timing Role: Unidirectional buffer amplifying low-drive FPGA or CPLD outputs to drive multiple relay drivers or optocouplers. Use Value: Delivers 64 mA sink current per output - sufficient to directly drive 5 V coil relays or LED indicators without external transistors. | Use Scenario: Expanding digital I/O count on automated test equipment (ATE) controller boards using legacy TTL architecture. IC Role / Device Role / Timing Role: Parallel port expander providing additional handshake and status lines for GPIB or IEEE-488 peripherals. Use Value: Dual OE inputs allow synchronized enable of input capture and output drive functions under microcontroller software control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal noninverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F244DWR | SOIC-20 package (DW), same electrical specs, RoHS-compliant NiPdAu finish, MSL Level-1. | Larger footprint (10.8 mm × 7.5 mm) but wider availability and easier hand-soldering; no shrink-outline constraint. | Select when board space permits and manual rework or prototyping is required. |
| SN74LS244N | Lower drive (24 mA sink), slower (15–25 ns delay), PDIP-20 package; LS-TTL family with reduced power consumption. | Better suited for low-speed, low-power legacy systems where fanout < 10 and timing slack > 20 ns exists. | Choose only if power budget is critical and speed requirements are relaxed below 10 MHz. |
Compared with SN74F244DWR and SN74LS244N, the SN74F244DB offers superior speed and density for space-constrained industrial backplanes, while retaining full pin and logic compatibility with the SN74F244 family - making it ideal for high-reliability, volume-manufactured legacy upgrades.
Availability
SN74F244DB is available at Aetrix Electronics and suitable for memory address buffering, industrial backplane interfacing, and legacy bus transceiver applications requiring stable component supply and long-term obsolescence management.
Supply support for SN74F244DB 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74F244DB belongs to TI's legacy 74F logic family, engineered for high-speed, high-fanout TTL-compatible digital interfacing in mission-critical industrial control and computing infrastructure.
FAQ
What is the operating temperature range for the SN74F244DB?
The SN74F244DB is characterized for operation from 0°C to 70°C, meeting commercial and industrial ambient requirements. It is not rated for extended temperature ranges like the military-grade SN54F244 (−55°C to 125°C). This makes the SN74F244DB appropriate for enclosed control cabinets and non-extreme environmental deployments where thermal management is stable.
Does the SN74F244DB support true bidirectional data flow?
No, the SN74F244DB is a unidirectional noninverting buffer - data flows only from A inputs to Y outputs. For bidirectional bus transceivers, TI recommends the SN74F245. The SN74F244DB provides two independent 4-bit channels, each with dedicated active-low OE control, enabling selective enable/disable of either group without affecting the other.
What is the maximum output current capability of the SN74F244DB?
The SN74F244DB delivers up to 64 mA of low-level output current (IOL) per pin at VCC = 4.5 V and TA = 25°C, and −15 mA of high-level output current (IOH). This allows direct driving of multiple TTL loads, 50 Ω transmission lines, or small-signal relays without external amplification - a key advantage over lower-drive families like 74LS.
Is the SN74F244DB pin-compatible with other 74F244 variants?
Yes, the SN74F244DB shares identical pinout and logic function with all 20-pin 74F244 variants including SN74F244DWR (SOIC), SN74F244N (PDIP), and SN74F244NSR (SOP). The DB (SSOP) package maintains the same pin numbering and electrical behavior - only the physical dimensions and thermal characteristics differ.
What does the "DB" suffix indicate in SN74F244DB?
The "DB" suffix identifies the Shrink Small-Outline Package (SSOP) variant - a surface-mount 20-pin package with 0.65 mm lead pitch, 7.5 mm × 5.6 mm body size, and 2.0 mm max height. This compact footprint reduces PCB area by over 50% compared to standard SOIC-20 (DW), while preserving full electrical and functional equivalence to the broader SN74F244 family.
SN74F244DB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74F
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- 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:
- 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74F244DB FAQ
1.How can I place an order for SN74F244DB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74F244DB 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 SN74F244DB reliable?
The price and inventory of SN74F244DB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74F244DB is usually 5 days.
3.What payment methods are accepted for SN74F244DB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74F244DB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74F244DB?
SN74F244DB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74F244DB 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 SN74F244DB?
For technical support, including SN74F244DB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74F244DB requirements.
6.How does Aetrix verify that SN74F244DB is sourced from the original manufacturer or authorized distributors?
All SN74F244DB 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 SN74F244DB meets industry standards.
7.What is the process for return or replacement of SN74F244DB?
All SN74F244DB units undergo pre-shipment inspection (PSI). If there is an issue with SN74F244DB, 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 SN74F244DB part is unused and in its original packaging.
Return procedure for SN74F244DB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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