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Texas Instruments SN74HCT244NSRG4
- Part No.:
- SN74HCT244NSRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74HCT244NSRG4.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,343
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Product details
Overview
SN74HCT244NSRG4 from Texas Instruments is an octal non-inverting 3-state buffer/line driver IC designed for bus-oriented memory address and clock signal buffering. It operates at 4.5–5.5 V, delivers ±6 mA output drive per channel, exhibits 13 ns typical propagation delay (at 5.5 V, 50 pF), and supports TTL-compatible inputs. It is used in server backplanes to isolate and strengthen address/data bus signals between CPU and memory modules.
For engineers reviewing the SN74HCT244NSRG4 datasheet, SN74HCT244NSRG4 pinout, SN74HCT244NSRG4 application, or SN74HCT244NSRG4 equivalent, key selection criteria include 3-state output control timing (ten/tdis ≤ 48 ns), high-current drive capability (±6 mA @ 5 V), low quiescent current (≤80 µA), and compatibility with legacy LSTTL loads in industrial and telecom infrastructure designs.
Technical Context
The SN74HCT244NSRG4 implements two independent 4-bit non-inverting buffers, each with dedicated output-enable (OE) inputs (1OE and 2OE). When OE is low, data passes transparently from A-inputs to Y-outputs; when OE is high, all eight outputs enter high-impedance state-enabling bidirectional bus sharing without contention.
Its HCT logic family ensures CMOS-level power efficiency while maintaining TTL voltage thresholds (VIH = 2.0 V min, VIL = 0.8 V max), allowing direct interface with legacy 5 V TTL systems. The device features balanced rise/fall times (tt ≤ 16 ns) and supports load capacitances up to 150 pF without violating timing specs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation across standard 5 V rail tolerances in industrial and telecom systems. |
| Propagation Delay (tpd) | 13 ns typical at VCC = 5.5 V, CL = 50 pF - Enables reliable timing in high-speed address/data bus applications up to ~30 MHz. |
| Output Drive | ±6 mA per output at 5 V - Drives up to 15 LSTTL loads directly, eliminating need for external buffer stages. |
| Quiescent Current (ICC) | ≤80 µA maximum - Minimizes standby power in always-on infrastructure equipment such as network switches. |
| Input Compatibility | TTL-voltage compatible (VIH ≥ 2.0 V, VIL ≤ 0.8 V) - Interoperates seamlessly with legacy 5 V TTL logic without level-shifting. |
| 3-State Enable Timing | ten ≤ 48 ns, tdis ≤ 48 ns (max, VCC = 5.5 V, CL = 50 pF) - Supports fast bus arbitration and dynamic signal routing in multi-master systems. |
| Input Leakage Current | ≤1 µA maximum - Prevents unintended biasing of floating or unterminated inputs in high-density PCB layouts. |
Pinout & Package
The SN74HCT244NSRG4 is packaged in a 20-pin SOP (Small Outline Package) with body dimensions of 12.6 mm × 5.3 mm and overall package size of 12.6 mm × 7.8 mm. It uses standard SOIC footprint with gull-wing leads and is RoHS-compliant with NiPdAu lead finish.
| 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); enables bus isolation during idle cycles. |
| 2, 4, 6, 8 | 1A1–1A4 | Inputs for first 4-bit buffer group; accept TTL-compatible logic levels to drive corresponding Y outputs. |
| 3, 5, 7, 9 | 2Y4–2Y1 | Outputs for second 4-bit driver group; provide high-current, 3-state buffered signals to external bus lines. |
| 11, 13, 15, 17 | 2A1–2A4 | Inputs for second 4-bit buffer group; electrically isolated from Group 1 for independent control. |
| 12, 14, 16, 18 | 1Y4–1Y1 | Outputs for first 4-bit buffer group; support simultaneous driving of memory address registers or LED segment drivers. |
| 10 | GND | Ground reference for all internal circuitry and I/O; must be low-impedance connection to minimize noise coupling. |
| 20 | VCC | Primary 5 V supply input; requires local 0.1 µF bypass capacitor to suppress switching transients and ensure clean logic operation. |
Key Features
| Feature | Design Value |
|---|---|
| Octal 3-state buffering | Two independent 4-bit groups with separate OE pins allow selective bus access and prevent contention in shared-memory architectures. |
| High-output current drive | ±6 mA per output sustains signal integrity over long PCB traces or into capacitive loads (e.g., 15 LSTTL loads), reducing need for repeaters. |
| Low static power consumption | ≤80 µA ICC enables use in thermally constrained environments like dense server blades without derating concerns. |
| TTL-compatible input thresholds | VIH ≥ 2.0 V and VIL ≤ 0.8 V guarantee interoperability with legacy 5 V TTL peripherals without external level translation. |
| Fast enable/disable timing | ten/tdis ≤ 48 ns ensures rapid bus turnaround in time-critical applications such as real-time I/O expanders and motor controller interfaces. |
Applications
| Server Memory Bus Buffering | LED Display Segment Driver |
|---|---|
Use Scenario: Isolating and strengthening address/data signals between CPU and DDR memory modules in rack-mounted servers. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer that enables/disables memory address lines under chipset control to prevent bus contention during refresh cycles. Use Value: ±6 mA drive maintains signal edge integrity across 10+ inch backplane traces; 13 ns tpd meets sub-40 ns timing budgets for DDR2/DDR3 address latching. |
Use Scenario: Driving common-anode 7-segment LED displays in industrial HMIs and telecom status panels. IC Role / Device Role / Timing Role: High-current line driver translating microcontroller GPIO outputs to segmented display anodes with active-low OE for multiplexing control. Use Value: 15 LSTTL load drive capability directly powers multiple LED segments per channel; 3-state outputs eliminate ghosting during digit scanning. |
| Network Switch Backplane Interface | Industrial I/O Expander |
Use Scenario: Level-shifting and buffering control signals between ASIC-based switch fabric and PHY management interfaces. IC Role / Device Role / Timing Role: Bidirectional bus interface component enabling hot-swap detection and configuration register access via shared MDIO/MDC buses. Use Value: TTL-compatible inputs simplify integration with legacy management controllers; 48 ns enable timing supports 20 Mbps MDIO burst transfers. |
Use Scenario: Extending GPIO count on PLC mainboards to drive relays, sensors, and indicator LEDs in factory automation systems. IC Role / Device Role / Timing Role: Parallel port expander providing eight additional digital outputs controlled by microcontroller SPI/I²C-to-parallel bridge ICs. Use Value: Low 1 µA input leakage prevents false triggering on unterminated expansion headers; 80 µA ICC reduces total system standby power. |
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 |
|---|---|---|---|
| SN74HCT244DWRG4 | SOIC-20 package (12.8 mm × 10.3 mm body), same electrical specs, higher thermal resistance (RθJA = 109.1°C/W vs 113.4°C/W for NS). | Better suited for through-hole prototyping or legacy board rework where larger SOIC footprint is acceptable. | Select when mechanical compatibility with existing SOIC footprints is required; identical logic behavior and timing. |
| SN74HCT244PWRE4 | TSSOP-20 package (6.5 mm × 4.4 mm body), same electrical specs, slightly faster tpd (13 ns typ) but tighter layout constraints. | Ideal for space-constrained telecom modules requiring high-density surface-mount assembly. | Choose for miniaturized designs where PCB area is critical; verify thermal performance under full-load conditions due to higher RθJA (131.8°C/W). |
Compared with SN74HCT244NSRG4, the DWRG4 offers legacy SOIC compatibility and easier hand-soldering, while the PWRE4 provides 45% smaller footprint at the cost of stricter thermal management-making the NSRG4 optimal for balanced density, manufacturability, and thermal performance in mid-volume industrial boards.
Availability
SN74HCT244NSRG4 is available at Aetrix Electronics and suitable for server backplanes, LED display drivers, and network switch control interfaces requiring stable component supply across extended temperature ranges (–40°C to 85°C) and long production lifecycles.
Supply support for SN74HCT244NSRG4 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 50 years of innovation in industrial, automotive, and communications markets.
The SN74HCT244NSRG4 belongs to TI's HCT logic family, engineered for 5 V mixed-signal systems requiring TTL compatibility, low power, and robust bus-driving capability in infrastructure-grade equipment.
FAQ
What is the operating temperature range for SN74HCT244NSRG4?
The SN74HCT244NSRG4 is rated for operation from –40°C to +85°C ambient temperature. This range is validated per TI's production test specifications and supports deployment in industrial control panels, telecom base stations, and commercial server environments where ambient temperatures exceed consumer-grade limits. The SN74HCT244NSRG4 maintains full electrical compliance-including VOH/VOL, tpd, and ICC-across this entire range.
Does SN74HCT244NSRG4 require external pull-up resistors on its OE pins?
No, the SN74HCT244NSRG4 does not require external pull-up resistors on 1OE or 2OE for normal operation. However, during power-up or power-down sequences where VCC is ramping, tying OE to VCC via a weak pull-up (e.g., 10 kΩ) ensures outputs remain in high-impedance state until valid logic levels are established-preventing bus contention. The SN74HCT244NSRG4 itself has no internal pull-ups on OE inputs.
Can SN74HCT244NSRG4 drive standard 5 V TTL loads directly?
Yes, the SN74HCT244NSRG4 is explicitly designed to drive up to 15 LSTTL loads per output. Its ±6 mA output drive at 5 V, TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and guaranteed VOL ≤ 0.4 V at IOL = 6 mA meet or exceed standard 5 V TTL fan-out requirements-enabling direct interface without level shifters or current-limiting resistors.
What is the maximum capacitive load SN74HCT244NSRG4 can drive while maintaining timing specs?
The SN74HCT244NSRG4 guarantees switching characteristics up to 150 pF load capacitance, as specified in TI's SCLS175I datasheet (Section 5.8). At CL = 150 pF and VCC = 5.5 V, tpd remains ≤ 61 ns and tt ≤ 57 ns. Exceeding 150 pF may increase propagation delay nonlinearly and induce ringing; for >150 pF loads, consider adding series termination or using a dedicated line driver.
Is SN74HCT244NSRG4 pin-compatible with other members of the SN74HCT244 family?
Yes, the SN74HCT244NSRG4 shares identical pinout and functionality with all SN74HCT244 variants in SOIC (DW), SSOP (DB), TSSOP (PW), and VSSOP (DGS) packages. Pin numbering, signal assignments (e.g., 1OE, 1A1–1A4, 1Y1–1Y4), and electrical behavior are fully consistent-enabling drop-in replacement across package types when board layout allows mechanical fit.
SN74HCT244NSRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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-SO
SN74HCT244NSRG4 FAQ
1.How can I place an order for SN74HCT244NSRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT244NSRG4 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 SN74HCT244NSRG4 reliable?
The price and inventory of SN74HCT244NSRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT244NSRG4 is usually 5 days.
3.What payment methods are accepted for SN74HCT244NSRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCT244NSRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HCT244NSRG4?
SN74HCT244NSRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT244NSRG4 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 SN74HCT244NSRG4?
For technical support, including SN74HCT244NSRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT244NSRG4 requirements.
6.How does Aetrix verify that SN74HCT244NSRG4 is sourced from the original manufacturer or authorized distributors?
All SN74HCT244NSRG4 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 SN74HCT244NSRG4 meets industry standards.
7.What is the process for return or replacement of SN74HCT244NSRG4?
All SN74HCT244NSRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT244NSRG4, 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 SN74HCT244NSRG4 part is unused and in its original packaging.
Return procedure for SN74HCT244NSRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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