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onsemi 74HC244DTR2G
- Part No.:
- 74HC244DTR2G
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74HC244DTR2G.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,427
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Product details
Overview
74HC244DTR2G from onsemi is an octal 3-state noninverting buffer/line driver with two active-low output enables, operating from 2.0 V to 6.0 V, delivering ±35 mA output drive per pin and supporting bus-oriented systems such as memory address drivers and clock distribution networks.
For engineers reviewing the 74HC244DTR2G datasheet, pinout, applications, or equivalent options, key selection criteria include 3-state control timing (tPLZ ≤ 165 ns at 125°C), TSSOP-20 package compatibility, LSTTL load drive (15 loads), and JEDEC Std. 7A compliance for industrial bus interfacing.
Technical Context
The 74HC244DTR2G implements eight independent noninverting buffers grouped into two 4-bit banks (A and B), each controlled by a dedicated active-low enable (Enable A on Pin 1, Enable B on Pin 19). Outputs enter high-impedance state when respective enable is high.
Designed for CMOS/NMOS/TTL interoperability, it accepts standard CMOS logic levels and-when pulled up-LSTTL inputs. Its propagation delay ranges from 15 ns (VCC = 6.0 V, TA = 25°C) to 135 ns (VCC = 2.0 V, TA = 125°C) for A→YA or B→YB paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - supports dual-supply legacy systems and battery-powered 3.3 V/5 V mixed-voltage buses |
| Output Drive Current | ±35 mA per pin - drives 15 LSTTL loads without external buffering in high-fanout address/data lines |
| Propagation Delay (A→YA) | 15 ns max at VCC = 6.0 V, TA = 25°C - enables reliable operation in 33 MHz bus cycles with margin |
| 3-State Enable Delay | tPLZ/tPHZ ≤ 165 ns at VCC = 2.0 V, TA = 125°C - ensures deterministic bus release timing under worst-case thermal conditions |
| Input Leakage Current | ±1.0 µA max at VCC = 6.0 V, TA = 125°C - minimizes static power draw and prevents unintended enable activation in low-power hold modes |
| ESD Rating | HBM 2000 V - meets IEC 61000-4-2 Level 2 for board-level handling robustness in manufacturing environments |
Pinout & Package
TSSOP-20 package (Case 948E), 0.65 mm pitch, Pb-free, rated for –55°C to +125°C operation. Dimensions: 6.60 mm × 4.40 mm × 1.20 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | Enable A / Enable B | Active-low controls for Bank A (Pins 2,4,6,8 → YA1–YA4) and Bank B (Pins 11,13,15,17 → YB1–YB4); independent bank isolation |
| 2,4,6,8 | A1–A4 Inputs | Noninverting data inputs for Bank A; tied to corresponding YA outputs when Enable A = LOW |
| 11,13,15,17 | B1–B4 Inputs | Noninverting data inputs for Bank B; tied to corresponding YB outputs when Enable B = LOW |
| 18,16,14,12 | YA1–YA4 Outputs | Bank A buffered outputs; high-impedance when Enable A = HIGH - enables bidirectional bus sharing |
| 9,7,5,3 | YB1–YB4 Outputs | Bank B buffered outputs; high-impedance when Enable B = HIGH - allows interleaved or time-multiplexed bus access |
| 20 | VCC | Positive supply rail; decoupling capacitor required within 10 mm for stable switching noise suppression |
| 10 | GND | Ground reference; must be connected to low-impedance system ground plane to limit ground bounce |
Key Features
| Feature | Design Value |
|---|---|
| Octal noninverting buffering with dual 3-state control | Enables independent gating of two 4-bit data channels on shared bus infrastructure without signal inversion |
| 15 LSTTL load drive capability | Eliminates need for external line drivers in legacy TTL-compatible memory and peripheral address decoding |
| JEDEC Std. 7A compliance | Guarantees interoperability with industry-standard high-speed CMOS logic families across voltage and timing domains |
| High noise immunity (CMOS input threshold) | VIH ≥ 3.15 V / VIL ≤ 1.35 V at VCC = 4.5 V - rejects >400 mV of coupled noise on PCB traces |
| Pb-free TSSOP-20 packaging | Meets RoHS Directive 2011/65/EU and J-STD-020 moisture sensitivity level 1 (MSL1) for reflow compatibility |
Applications
| Memory Address Buffering | Microcontroller Bus Expansion |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM or flash devices on a shared bus. IC Role / Device Role / Timing Role: Noninverting buffer with bank-selectable 3-state control isolates address latches during memory arbitration cycles. Use Value: Enables clean address propagation with <135 ns worst-case delay at 125°C and eliminates contention via independent Enable A/Enable B sequencing. |
Use Scenario: Expanding GPIO count of an ARM Cortex-M0+ MCU to interface with parallel LCD controllers and keypad matrices. IC Role / Device Role / Timing Role: Bidirectional bus driver providing level-shifted, slew-controlled outputs compatible with 3.3 V and 5 V peripherals. Use Value: Delivers ±35 mA per pin to directly drive LCD segment lines while maintaining VIH/VIL margins across temperature. |
| Industrial PLC I/O Module | Legacy ISA Bus Interface |
|
Use Scenario: Isolating and buffering digital I/O signals between FPGA-based logic and optocoupled field-side terminals in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Signal conditioner that translates FPGA CMOS levels to robust 5 V TTL-compatible outputs with ESD-hardened inputs. Use Value: HBM 2000 V rating and 15 LSTTL load drive ensure reliable operation in electrically noisy factory-floor environments. |
Use Scenario: Replacing obsolete 74LS244 in retro-computing hardware restoration projects requiring drop-in timing and pin compatibility. IC Role / Device Role / Timing Role: Pinout-identical upgrade offering lower power, wider voltage range, and improved noise immunity over bipolar LS logic. Use Value: Maintains identical function table and pin assignment while reducing ICC quiescent current from ~25 mA to <40 µA at VCC = 6.0 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal noninverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC244N | DIP-20 package, higher thermal resistance (θJA = 70°C/W vs. TSSOP's 130°C/W), no tape-and-reel option | Suitable for prototyping and through-hole PCBs; not recommended for high-density or thermally constrained layouts | Select SN74HC244N only when manual soldering or breadboard validation is required prior to TSSOP production use. |
| MC74HC244ADTR2G | Identical electrical specs and pinout; manufactured by ON Semiconductor under alternate part numbering (same die, same wafer lot traceability) | No functional difference; used interchangeably in automotive-grade BOMs where AEC-Q100 qualification is mandated | Choose MC74HC244ADTR2G when AEC-Q100 Grade 2 (–40°C to +105°C) compliance is contractually required for automotive ECUs. |
Compared with SN74HC244N and MC74HC244ADTR2G, the 74HC244DTR2G offers optimal surface-mount manufacturability in space-constrained industrial designs, with verified 125°C operation and native tape-and-reel delivery for SMT line integration - unlike the DIP variant, and without requiring automotive qualification overhead unless specified.
Availability
74HC244DTR2G is available at Aetrix Electronics and suitable for memory address buffering, microcontroller bus expansion, industrial PLC I/O modules, and legacy ISA bus interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 74HC244DTR2G 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.
The 74HC244DTR2G belongs to onsemi's High-Speed CMOS logic family, engineered for robust bus interfacing in industrial control, instrumentation, and legacy system upgrades where reliability, wide voltage operation, and 3-state flexibility are critical.
FAQ
What is the maximum operating temperature for the 74HC244DTR2G?
The 74HC244DTR2G is rated for continuous operation from –55°C to +125°C, as confirmed in the Recommended Operating Conditions table (Page 3 of the datasheet). This full industrial temperature range is supported in the TSSOP-20 package with appropriate PCB thermal relief and airflow.
Does the 74HC244DTR2G support 3.3 V logic systems?
Yes, the 74HC244DTR2G operates reliably at VCC = 3.3 V, with guaranteed VOH ≥ 3.17 V and VOL ≤ 0.33 V under 6.0 mA load (Page 3, DC Electrical Characteristics). Its VIH/VIL thresholds scale with VCC, ensuring clean switching in mixed-voltage 3.3 V/5 V systems.
How many output enable pins does the 74HC244DTR2G have?
The 74HC244DTR2G has two active-low output enable pins: Enable A (Pin 1) controls YA1–YA4, and Enable B (Pin 19) controls YB1–YB4. This dual-enable architecture allows independent 4-bit channel gating - essential for time-multiplexed bus sharing.
Is the 74HC244DTR2G pin-compatible with the 74LS244?
Yes, the 74HC244DTR2G is explicitly designed to be pinout-identical to the 74LS244 (first sentence of datasheet Page 1). All 20 pins match in function and location, enabling direct replacement in existing LS-based designs with improved speed, noise immunity, and power efficiency.
What is the typical power dissipation of the 74HC244DTR2G at 5 V?
At VCC = 5.0 V and 25°C, the typical no-load dynamic power consumption is calculated using CPD = 34 pF (Page 4): PD = CPD × VCC² × f + ICC × VCC. With f = 1 MHz and ICC ≈ 4 µA, PD ≈ 0.85 mW - well below the TSSOP package's 450 mW absolute maximum rating.
74HC244DTR2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74HC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74HC244DTR2G FAQ
1.How can I place an order for 74HC244DTR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC244DTR2G 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 74HC244DTR2G reliable?
The price and inventory of 74HC244DTR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC244DTR2G is usually 5 days.
3.What payment methods are accepted for 74HC244DTR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC244DTR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC244DTR2G?
74HC244DTR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC244DTR2G 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 74HC244DTR2G?
For technical support, including 74HC244DTR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC244DTR2G requirements.
6.How does Aetrix verify that 74HC244DTR2G is sourced from the original manufacturer or authorized distributors?
All 74HC244DTR2G 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 74HC244DTR2G meets industry standards.
7.What is the process for return or replacement of 74HC244DTR2G?
All 74HC244DTR2G units undergo pre-shipment inspection (PSI). If there is an issue with 74HC244DTR2G, 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 74HC244DTR2G part is unused and in its original packaging.
Return procedure for 74HC244DTR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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