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Texas Instruments SN74HCT244DGSR
- Part No.:
- SN74HCT244DGSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
SN74HCT244DGSR.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,988
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Product details
Overview
SN74HCT244DGSR from Texas Instruments is an octal non-inverting 3-state buffer/line driver IC operating at 4.5–5.5 V, delivering ±6 mA output drive per channel with 13 ns typical propagation delay (VCC = 5.5 V, CL = 50 pF) and supporting up to 15 LSTTL loads - used in bus interface, memory address buffering, and LED display driver circuits.
For engineers reviewing the SN74HCT244DGSR datasheet, SN74HCT244DGSR pinout, SN74HCT244DGSR application, or SN74HCT244DGSR equivalent, key selection criteria include its VSSOP-20 package footprint, 3-state output control per group, TTL-compatible inputs, low 80 µA max ICC, and guaranteed operation from –40°C to +125°C.
Technical Context
The SN74HCT244DGSR implements two independent 4-bit non-inverting buffer groups, each with dedicated active-low output-enable (OE) control. When OE is low, data passes transparently from A inputs to Y outputs; when high, all eight outputs enter high-impedance state - enabling bidirectional bus sharing without contention.
It uses HCMOS technology with TTL-voltage-compatible inputs (VIH = 2 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), supports 50–150 pF load capacitance, and features input leakage ≤1 µA and output leakage ≤10 µA at VCC = 5.5 V - ensuring stable logic levels in mixed-technology systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.5 V to 5.5 V - compatible with standard 5 V logic rails and tolerant of ±5% regulation variation. |
| Propagation delay (tpd) | 13 ns typical (5.5 V, CL = 50 pF) - enables reliable timing in high-speed digital interfaces up to ~30 MHz. |
| Output drive | ±6 mA per output at 5 V - sufficient to directly drive 15 LSTTL loads or moderate-capacitance PCB traces. |
| Input compatibility | TTL-voltage compatible (VIH ≥ 2 V, VIL ≤ 0.8 V) - interoperable with legacy 74LS and microcontroller GPIOs. |
| Quiescent current (ICC) | 80 µA maximum - enables low-static-power operation in always-on or battery-backed subsystems. |
| Operating temperature | –40°C to +125°C - qualified for industrial and extended-temperature embedded applications. |
| ESD rating (HBM) | ±2000 V - meets JEDEC JS-001 Class 2, supporting robust handling in automated assembly. |
Pinout & Package
VSSOP-20 (DGS) package: 5.1 mm × 3.0 mm body size, 0.5 mm pitch, thin-profile surface-mount construction optimized for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable controls for Group 1 (pins 2–9) and Group 2 (pins 11–18); tied high disables both groups. |
| 2–5, 11–14 | 1A1–1A4, 2A1–2A4 | Non-inverting digital inputs; TTL-compatible thresholds ensure noise margin with legacy logic families. |
| 3, 5, 7, 9, 12, 14, 16, 18 | 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs; high-impedance state eliminates bus contention during data direction switching. |
| 10 | GND | Ground reference for logic and power return; must be low-inductance connection to minimize switching noise. |
| 20 | VCC | Positive supply rail (4.5–5.5 V); requires local 0.1 µF ceramic bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Two independent 4-bit groups | Enables selective bus isolation - e.g., enable Group 1 for address latching while holding Group 2 disabled during data transfer. |
| 3-state outputs with fast enable/disable | ten/tdis ≤ 48 ns (5.5 V, CL = 50 pF) ensures clean bus arbitration without glitches during mode transitions. |
| Low input current | ≤1 µA max allows direct interfacing with high-impedance sources (e.g., pull-up/pull-down networks, analog switches). |
| High noise immunity | Input hysteresis and 0.4 V noise margin (VIH–VIL) suppress false triggering from EMI or crosstalk on shared PCB traces. |
| VSSOP-20 thermal performance | RθJA = 130.6°C/W enables sustained operation at full drive without external heatsinking in ambient ≤85°C environments. |
Applications
| Memory Address Buffering | LED Display Driver Interface |
|---|---|
|
Use Scenario: Buffering 16-bit address bus between MCU and parallel SRAM/Flash to reduce loading and improve signal integrity. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer isolating address lines; enables time-multiplexed access to multiple memory devices via OE control. Use Value: Prevents address skew and fanout-induced timing violations while supporting hot-swap memory module detection via controlled high-Z states. |
Use Scenario: Driving common-anode 7-segment or dot-matrix LED displays from microcontroller GPIOs with limited current capability. IC Role / Device Role / Timing Role: High-current line driver translating logic-level signals to segment/column drive voltages; 3-state allows dynamic multiplexing. Use Value: Eliminates need for discrete transistor arrays; ±6 mA per output sustains bright LED illumination without external current-limiting resistors on the anode side. |
| Industrial I/O Expansion | Network Switch Control Plane |
|
Use Scenario: Expanding digital I/O count on PLC or motor controller boards using SPI/I²C-to-parallel bridge ICs. IC Role / Device Role / Timing Role: Level-shifting and fanout buffer between low-drive interface IC and high-capacitance field wiring or optocoupler inputs. Use Value: Ensures clean edge rates across long traces; 125°C rating supports operation in enclosed enclosures with elevated ambient temperatures. |
Use Scenario: Isolating management bus signals (e.g., MDIO, reset, LED status) between switch ASIC and front-panel LEDs or PHYs. IC Role / Device Role / Timing Role: Bidirectional bus buffer with independent OE control per group - separates control plane traffic from data path interference. Use Value: Prevents latch-up during hot-plug events; 3-state behavior allows safe insertion/removal of daughter cards without system reset. |
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 |
|---|---|---|---|
| SN74HCT244DWR | SOIC-20 package (12.8 mm × 10.3 mm), same electrical specs, but higher RθJA (109.1°C/W) and rated for –40°C to +125°C. | Better suited for through-hole prototyping or legacy board designs requiring larger pitch and manual rework capability. | Select when mechanical compatibility with existing SOIC footprints or hand-soldering requirements outweigh space constraints. |
| SN74LVC244APWR | Lower VCC range (1.65–3.6 V), 3.3 V native logic, 24 mA drive, but not TTL-input compatible - requires level translation if interfacing with 5 V systems. | Targeted for modern low-voltage embedded systems (e.g., ARM Cortex-M based controllers), not drop-in replacement for 5 V legacy designs. | Choose only when migrating to 3.3 V domains; verify input threshold compatibility and recalculate pull-up resistor values if mixing voltage domains. |
Compared with SN74HCT244DWR and SN74LVC244APWR, the SN74HCT244DGSR offers the smallest PCB footprint (5.1 × 3.0 mm), best thermal resistance among 5 V-compatible variants (RθJA = 130.6°C/W), and guaranteed 5 V TTL interoperability - making it optimal for space- and thermally constrained industrial modules.
Availability
SN74HCT244DGSR is available at Aetrix Electronics and suitable for industrial I/O expansion, LED display driver circuits, and memory address buffering requiring stable component supply across extended temperature ranges and high-volume production cycles.
Supply support for SN74HCT244DGSR 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 with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74HCT244DGSR belongs to TI's 74HCT logic family - designed specifically for high-density, high-performance 3-state bus interface applications where TTL compatibility, low power, and robust noise immunity are critical.
FAQ
What is the maximum operating temperature for SN74HCT244DGSR?
The SN74HCT244DGSR is specified for continuous operation from –40°C to +125°C, validated per TI's extended-temperature qualification standards. This rating applies to the VSSOP-20 (DGS) package variant and supports deployment in sealed industrial enclosures, motor control cabinets, and under-hood automotive modules where ambient heat buildup occurs.
Does SN74HCT244DGSR require external pull-up resistors on its OE pins?
Yes - for predictable high-impedance behavior during power-up or power-down sequences, SN74HCT244DGSR OE pins must be tied to VCC via pull-up resistors. TI recommends a minimum value determined by the driving source's current-sinking capability; typical values range from 4.7 kΩ to 10 kΩ for standard CMOS drivers.
Can SN74HCT244DGSR drive LEDs directly without current-limiting resistors?
No - while SN74HCT244DGSR provides ±6 mA per output, direct LED connection without series resistance risks exceeding absolute maximum ratings under varying forward voltage conditions. A current-limiting resistor must be used on either the anode or cathode side to constrain peak current to ≤6 mA and ensure long-term reliability.
Is SN74HCT244DGSR pin-compatible with other 74HCT244 variants?
Yes - all 74HCT244 variants share identical 20-pin functional pinout regardless of package (VSSOP, SOIC, PDIP, TSSOP). The SN74HCT244DGSR maintains full pin-to-pin compatibility with SN74HCT244DWR, SN74HCT244N, and SN74HCT244PWR, enabling drop-in substitution when package footprint and thermal requirements align.
What is the recommended bypass capacitor for SN74HCT244DGSR?
Texas Instruments specifies a 0.1 µF ceramic capacitor placed as close as possible to the VCC pin (pin 20) of SN74HCT244DGSR. This minimizes high-frequency supply impedance and suppresses switching noise coupling into adjacent signal traces - especially critical in dense VSSOP layouts where trace inductance amplifies transient voltage spikes.
SN74HCT244DGSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-TFSOP (0.118", 3.00mm 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-VSSOP
SN74HCT244DGSR FAQ
1.How can I place an order for SN74HCT244DGSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT244DGSR 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 SN74HCT244DGSR reliable?
The price and inventory of SN74HCT244DGSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT244DGSR is usually 5 days.
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Note: Certain payment methods may incur a processing fee.
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SN74HCT244DGSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT244DGSR 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 SN74HCT244DGSR?
For technical support, including SN74HCT244DGSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT244DGSR requirements.
6.How does Aetrix verify that SN74HCT244DGSR is sourced from the original manufacturer or authorized distributors?
All SN74HCT244DGSR 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 SN74HCT244DGSR meets industry standards.
7.What is the process for return or replacement of SN74HCT244DGSR?
All SN74HCT244DGSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT244DGSR, 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 SN74HCT244DGSR part is unused and in its original packaging.
Return procedure for SN74HCT244DGSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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