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Texas Instruments SN74HC244DBR
- Part No.:
- SN74HC244DBR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74HC244DBR.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,244
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Product details
Overview
SN74HC244DBR from Texas Instruments is an octal noninverting 3-state buffer/line driver IC used for bus interfacing, memory address driving, and I/O expansion in digital systems. It operates from 2V to 6V, delivers ±6mA output drive at 5V, exhibits typical propagation delay of 11ns (VCC = 6V, CL = 50pF), and supports industrial temperature range (–40°C to 125°C). It is commonly deployed in LED display drivers and network switch control planes.
For engineers reviewing the SN74HC244DBR datasheet, SN74HC244DBR pinout, SN74HC244DBR application, or SN74HC244DBR equivalent, key selection criteria include 3-state output timing (ten/tdis ≤ 34ns max at 6V), low ICC (≤80µA max), high noise immunity (VIH ≥ 3.15V at VCC = 4.5V), and SSOP-20 package compatibility with dense PCB layouts.
Technical Context
The SN74HC244DBR implements two independent 4-bit buffer banks, each controlled by a dedicated output-enable (OE) input. Each bank passes noninverted logic from A inputs to Y outputs when its OE is low; outputs enter high-impedance state when OE is high. This architecture enables bidirectional bus isolation and selective signal routing without inversion.
It uses standard CMOS inputs with ≤10pF input capacitance and ≤1µA input leakage, requiring defined VIH/VIL thresholds and fast input transitions (≤500 ns/V at 4.5V) to prevent oscillation or excess current. Output drive capability (±6mA at 5V) supports direct connection to 15 LSTTL loads while maintaining rail-to-rail VOH/VOL performance across supply and temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2V to 6V - Enables interoperability with 3.3V and 5V logic families without level shifters. |
| Propagation Delay (tpd) | 11ns typical at VCC = 6V, CL = 50pF - Supports >30 MHz bus operation in high-speed digital interfaces. |
| Output Drive | ±6mA at VCC = 4.5V - Sufficient to directly drive 15 LSTTL inputs or moderate-capacitance PCB traces. |
| Quiescent Current (ICC) | 8µA maximum at VCC = 6V, TA = 25°C - Enables low-power standby modes in battery-backed or energy-sensitive systems. |
| Input Leakage (II) | ±100nA maximum at VCC = 6V - Ensures stable logic levels even with high-impedance pull-up/down networks. |
| 3-State Enable/Disable Time | 13ns typical ten/tdis at VCC = 6V, CL = 50pF - Allows precise timing control for bus arbitration and hot-swap signaling. |
| Operating Temperature | –40°C to 125°C - Qualified for industrial and extended-temperature embedded applications including telecom infrastructure. |
Pinout & Package
SN74HC244DBR is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm lead pitch, 7.2mm × 7.8mm body size, and gull-wing leads suitable for surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable inputs - Independently control high-impedance state for Bank 1 (pins 2,4,6,8 → 18,16,14,12) and Bank 2 (pins 11,13,15,17 → 9,7,5,3). |
| 2,4,6,8 | 1A1–1A4 | Bank 1 input signals - Noninverting data inputs routed to corresponding Y outputs when 1OE = L. |
| 11,13,15,17 | 2A1–2A4 | Bank 2 input signals - Independent 4-bit input group enabled by 2OE. |
| 18,16,14,12 | 1Y1–1Y4 | Bank 1 buffered outputs - High-drive, 3-state outputs mirroring 1A1–1A4 when 1OE = L. |
| 9,7,5,3 | 2Y1–2Y4 | Bank 2 buffered outputs - Electrically isolated from Bank 1; supports separate bus segments or load groups. |
| 10 | GND | Ground reference - Must be low-impedance connection; shared return path for all inputs/outputs. |
| 20 | VCC | Positive supply - Requires local 0.1µF ceramic bypass capacitor placed adjacent to pin per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 2V–6V operation allows single-supply compatibility with 3.3V microcontrollers and legacy 5V peripherals. |
| High-Drive Outputs | ±6mA drive at 4.5V ensures robust signal integrity across 10cm PCB traces or moderate capacitive loads (≤150pF). |
| Dual Independent Banks | Separate OE pins enable time-multiplexed bus sharing or fault-isolated channel control without inter-bank crosstalk. |
| Low Power Consumption | 8µA max ICC at 6V enables integration into always-on subsystems without thermal or battery-life penalties. |
| CMOS Input Compatibility | Standard CMOS inputs eliminate need for external pull-ups in most microcontroller interface scenarios. |
Applications
| LED Display Driver | Network Switch Control Plane |
|---|---|
Use Scenario: Driving column/row lines of multiplexed 7-segment or dot-matrix LED displays in industrial HMIs. IC Role / Device Role / Timing Role: Octal buffer isolates MCU GPIOs from display sink/source currents while enabling simultaneous segment activation via 3-state control. Use Value: ±6mA output drive directly sources/sinks common-anode or common-cathode LED segments without external transistors. |
Use Scenario: Interfacing management MCU to multiple PHY registers, EEPROMs, and status LEDs in Layer 2/L3 switches. IC Role / Device Role / Timing Role: Bidirectional bus buffer with independent OE control routes configuration data between processor and peripheral ICs on shared I²C/SPI-like buses. Use Value: Dual-bank architecture permits concurrent access to separate device groups, reducing bus arbitration overhead and latency. |
| Industrial I/O Expander | Motor Driver Interface Logic |
Use Scenario: Extending GPIO count of PLC controllers or motion controllers to manage discrete sensors, relays, and indicators. IC Role / Device Role / Timing Role: Level-shifting and current-boosting buffer between low-drive microcontroller outputs and 24V industrial field devices via optocouplers or level translators. Use Value: 2V–6V supply range matches both 3.3V logic and 5V interface standards; 125°C rating supports enclosure-mounted operation near power electronics. |
Use Scenario: Isolating and conditioning step/direction signals from motion controllers to stepper or BLDC motor driver ICs. IC Role / Device Role / Timing Role: 3-state output buffering prevents signal contention during fault conditions or power sequencing; fast tpd (11ns) preserves timing margins in closed-loop servo systems. Use Value: Low propagation delay and tight enable/disable timing ensure deterministic pulse delivery critical for microstepping accuracy. |
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 |
|---|---|---|---|
| SN74HCT244DBR | CMOS inputs with TTL-compatible thresholds (VIH = 2.0V min); identical pinout and timing. | Better suited for mixed 5V TTL/CMOS systems where input noise margin must match legacy TTL logic levels. | Select when interfacing directly to 74LS or 74F series outputs without level translation. |
| 74LCX244MTCX | Lower VCC range (2.0V–3.6V), higher speed (tpd = 5.5ns typ at 3.3V), different pinout (TSSOP-20). | Optimized for 3.3V-only portable or low-power systems; not drop-in compatible due to voltage and pin assignment differences. | Choose for new 3.3V designs prioritizing speed and power efficiency over 5V interoperability. |
Compared with SN74HC244DBR, SN74HCT244DBR offers guaranteed TTL-input compatibility at 5V but no advantage in 3.3V systems, while 74LCX244MTCX delivers faster switching and lower voltage operation but requires board redesign and lacks 5V tolerance.
Availability
SN74HC244DBR is available at Aetrix Electronics and suitable for LED display drivers, network switch control planes, and industrial I/O expanders requiring stable component supply across automotive-qualified, industrial, and telecom-grade production cycles.
Supply support for SN74HC244DBR 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 SN74HC244DBR belongs to TI's HC logic family, designed for high-speed, low-power, pin-compatible replacements of legacy TTL buffers in memory addressing, bus driving, and system-level signal isolation applications.
FAQ
What is the maximum operating temperature for SN74HC244DBR?
The SN74HC244DBR is rated for operation from –40°C to +125°C, making it suitable for industrial environments such as telecom infrastructure and motor control enclosures where ambient temperatures exceed standard commercial limits. This rating is confirmed in Section 5.3 of the official datasheet and applies specifically to the DB (SSOP-20) package variant.
Does SN74HC244DBR support 3.3V logic levels?
Yes, SN74HC244DBR fully supports 3.3V operation: VIH is guaranteed ≥2.0V at VCC = 3.3V, and VOL remains ≤0.26V at IOL = 6mA. Its 2V–6V supply range ensures reliable interfacing with 3.3V microcontrollers and FPGAs without level-shifting circuitry.
Can SN74HC244DBR drive LEDs directly?
Yes, SN74HC244DBR can drive standard indicator LEDs directly: each output delivers up to 6mA sink/source at 4.5V, sufficient for low-current (≤5mA) LEDs. For higher-brightness or multiplexed displays, verify total package power dissipation (P = VCC × ICC + Σ|VO × IO|) remains within thermal limits.
What is the recommended bypass capacitor for SN74HC244DBR?
A 0.1µF ceramic capacitor placed as close as possible to the VCC pin (Pin 20) and GND (Pin 10) is explicitly recommended in Section 8.3 of the datasheet. This minimizes high-frequency supply noise and prevents output ringing during fast edge transitions, especially critical in SSOP-20 layouts with narrow trace widths.
How does the dual OE architecture of SN74HC244DBR improve system design?
The SN74HC244DBR's two independent OE inputs (1OE and 2OE) allow separate control of two 4-bit banks, enabling time-multiplexed bus sharing, fault-isolated channel shutdown, or staggered power-up sequencing. This eliminates need for additional logic gates or software coordination when managing multiple peripheral groups on a shared data path.
SN74HC244DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74HC244DBR FAQ
1.How can I place an order for SN74HC244DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC244DBR 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 SN74HC244DBR reliable?
The price and inventory of SN74HC244DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC244DBR is usually 5 days.
3.What payment methods are accepted for SN74HC244DBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC244DBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC244DBR?
SN74HC244DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC244DBR 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 SN74HC244DBR?
For technical support, including SN74HC244DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC244DBR requirements.
6.How does Aetrix verify that SN74HC244DBR is sourced from the original manufacturer or authorized distributors?
All SN74HC244DBR 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 SN74HC244DBR meets industry standards.
7.What is the process for return or replacement of SN74HC244DBR?
All SN74HC244DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC244DBR, 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 SN74HC244DBR part is unused and in its original packaging.
Return procedure for SN74HC244DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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