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Texas Instruments SN74HC244QPWREP
- Part No.:
- SN74HC244QPWREP
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HC244QPWREP.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,552
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Product details
Overview
SN74HC244QPWREP from Texas Instruments is an octal 3-state noninverting buffer/line driver IC designed for memory address and bus signal conditioning in industrial control and embedded systems. It features two independent 4-bit sections with separate output-enable (OE) controls, operates from 2 V to 6 V, supports −40°C to 125°C extended temperature range, and delivers ±7.8 mA output drive per channel into LSTTL loads.
For engineers reviewing the SN74HC244QPWREP datasheet, SN74HC244QPWREP pinout, SN74HC244QPWREP application, or SN74HC244QPWREP equivalent, key selection considerations include its TSSOP-20 package, 3-state bus interface capability, high-current drive strength, propagation delay under 34 ns at 4.5 V, and qualification for harsh-environment operation.
Technical Context
This device implements dual 4-bit noninverting buffer architecture with independent OE control per section, enabling selective bus isolation without data inversion. Each output supports true 3-state (high-impedance) behavior when OE is high, allowing shared-bus contention-free operation.
Designed for HC logic family compatibility, it exhibits CMOS input characteristics (≤1 µA leakage), TTL-compatible output swing (VOH ≥ 3.98 V / VOL ≤ 0.26 V at 4.5 V), and robust noise immunity with VIH = 3.15 V and VIL = 1.35 V at nominal VCC = 4.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | High-speed CMOS (HC), fully compatible with TTL input thresholds and output drive levels |
| Supply Voltage Range | 2 V to 6 V - enables interoperability across 3.3 V and 5 V system domains |
| Output Drive Strength | ±7.8 mA per Y output at VCC = 4.5 V - sufficient to drive 15 LSTTL loads directly |
| Propagation Delay (tpd) | 13–34 ns (VCC = 4.5 V, CL = 50 pF) - supports reliable timing in sub-30 MHz bus applications |
| Enable/Disable Time (ten/tdis) | 15–45 ns (VCC = 4.5 V, CL = 50 pF) - ensures clean bus turnaround during direction switching |
| Operating Temperature | −40°C to 125°C - qualified for extended industrial and transportation environments |
| Input Leakage Current | ±100 nA max at VCC = 6 V - minimizes static power and signal integrity impact on high-impedance buses |
Pinout & Package
TSSOP-20 package (PW), 6.5 mm × 4.4 mm footprint, 0.65 mm lead pitch, 1.2 mm maximum height, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Section Output Enable (active-low) | Independent control of 4-bit output groups; high = high-Z, low = enabled pass-through |
| 1A1–1A4, 2A1–2A4 | Input terminals | Noninverting data inputs for each 4-bit buffer section |
| 1Y1–1Y4, 2Y1–2Y4 | Output terminals | Buffered, noninverted outputs; 3-state capable with fast enable/disable transitions |
| VCC (Pin 19), GND (Pin 10) | Power supply connections | Single-supply operation; decoupling required near VCC/GND pins for noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit sections | Enables selective bus buffering - e.g., address vs. data lanes - without cross-talk or shared enable constraints |
| High-current 3-state outputs | Drives up to 15 LSTTL loads while maintaining rail-to-rail VOH/VOL margins, eliminating need for external bus transceivers |
| Extended temperature qualification | Tested per JEDEC standards including HAST, temperature cycling, and electromigration - validated for −40°C to 125°C continuous operation |
| Low dynamic power consumption | Typical Cpd = 35 pF per buffer - reduces switching current and EMI in high-frequency bus applications |
| Controlled baseline manufacturing | Single assembly/test site and single fabrication site - ensures consistent parametric performance and long-term supply stability |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module Bus Isolation |
|---|---|
Use Scenario: Isolating microcontroller GPIOs from noisy 24 V I/O expansion cards in programmable logic controllers. IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control synchronizes with CPU write strobes to prevent bus contention during card hot-swap. Use Value: ±7.8 mA drive ensures reliable signal integrity over 15 cm backplane traces; −40°C to 125°C rating matches enclosure thermal profile. |
Use Scenario: Level-shifting and isolating CAN controller address/data lines from legacy 5 V sensor subsystems in body domain ECUs. IC Role / Device Role / Timing Role: Dual-section buffering separates memory-mapped peripheral addressing (Section 1) from diagnostic data streaming (Section 2). Use Value: Independent OE pins allow staggered enable timing to avoid simultaneous bus loading; HC logic thresholds reject automotive EMI. |
| Medical Imaging Data Acquisition Buffering | Ruggedized Handheld Test Equipment Signal Conditioning |
Use Scenario: Driving ADC parallel output buses from FPGA-based image processing engines in portable ultrasound units. IC Role / Device Role / Timing Role: Octal buffer presents low capacitive load to FPGA outputs while delivering clean, slew-controlled signals to 12-bit ADC inputs. Use Value: 34 ns max tpd at 4.5 V meets 20 MHz sampling clock timing budgets; TSSOP-20 saves PCB area versus SOIC alternatives. |
Use Scenario: Interfacing ARM Cortex-M7 debug port signals to modular probe interfaces subject to mechanical shock and thermal cycling. IC Role / Device Role / Timing Role: Bidirectional bus driver (with external direction control) conditions SWD/JTAG signals between host debugger and target DUT. Use Value: Qualified extended temperature range eliminates derating concerns; 0.65 mm pitch supports fine-pitch test fixture integration. |
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 |
|---|---|---|---|
| SN74HCT244QPWREP | CMOS input with TTL-compatible thresholds (VIH = 2.0 V min); identical pinout, timing, and drive strength | Better suited for mixed 5 V TTL/CMOS systems where input noise margin must match legacy TTL logic levels | Select when interfacing directly to 5 V TTL outputs without level shifters |
| SN74LVC244APWRE4 | Lower VCC range (1.65–3.6 V), higher speed (tpd = 5.2 ns @ 3.3 V), but rated only to 105°C | Optimized for modern 3.3 V embedded processors; not suitable for >105°C ambient or 5 V bus domains | Select for compact, high-speed 3.3 V-only designs where extended temperature is not required |
Compared with SN74HC244QPWREP, SN74HCT244QPWREP offers tighter input threshold alignment with legacy TTL, while SN74LVC244APWRE4 provides faster switching and lower voltage operation at the cost of temperature range and 5 V compatibility.
Availability
SN74HC244QPWREP is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74HC244QPWREP 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 decades of experience in high-reliability industrial and automotive components.
The SN74HC244QPWREP belongs to TI's enhanced-product (EP) logic portfolio, engineered for extended temperature operation, controlled manufacturing, and long-term availability in mission-critical industrial and transportation systems.
FAQ
What is the maximum operating voltage for SN74HC244QPWREP?
The absolute maximum supply voltage for SN74HC244QPWREP is 7 V, but the recommended operating range is 2 V to 6 V. Operation at 6 V ensures full specification compliance for VOH, VOL, and timing parameters across the −40°C to 125°C temperature range. Exceeding 6 V risks parametric degradation or reliability failure, even if within absolute maximum ratings.
Does SN74HC244QPWREP support hot-swap or live-insertion on a powered bus?
SN74HC244QPWREP is not explicitly rated for hot-swap operation. Its absolute maximum input voltage is limited to VCC + 0.5 V, and input clamp current is ±20 mA. Without external series resistors or bus-keeper circuits, applying signals before VCC ramp-up may exceed IIK limits. For live-insertion, use external protection or select a dedicated hot-swap buffer.
How does the enable timing of SN74HC244QPWREP affect bus contention risk?
SN74HC244QPWREP specifies ten and tdis of 15–45 ns (VCC = 4.5 V, CL = 50 pF). This fast enable/disable transition minimizes overlap between driving and receiving devices on shared buses. To eliminate contention, ensure OE deassertion occurs at least 50 ns before any other driver asserts its output on the same net - verified via oscilloscope measurement of actual board-level waveforms.
Can SN74HC244QPWREP drive a 50 Ω transmission line directly?
No. SN74HC244QPWREP is not designed for 50 Ω line driving. Its output structure targets LSTTL loads (≈1 kΩ pull-up), not RF impedance matching. Driving 50 Ω loads causes excessive current (≥100 mA), exceeding the ±35 mA absolute max output rating and risking latch-up or permanent damage. Use a dedicated line driver IC or series termination for controlled-impedance traces.
Is SN74HC244QPWREP pin-compatible with standard SN74HC244 variants?
Yes. SN74HC244QPWREP shares identical pinout, function table, and logic behavior with all SN74HC244 family members in TSSOP-20 (PW) packaging, including SN74HC244PWR and SN74HC244PWRE4. Differences are limited to qualification level (EP vs. commercial), temperature range, and reliability testing - not electrical or mechanical interface.
SN74HC244QPWREP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74HC244QPWREP FAQ
1.How can I place an order for SN74HC244QPWREP through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC244QPWREP 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 SN74HC244QPWREP reliable?
The price and inventory of SN74HC244QPWREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC244QPWREP is usually 5 days.
3.What payment methods are accepted for SN74HC244QPWREP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC244QPWREP transactions.
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4.How is shipping managed for SN74HC244QPWREP?
SN74HC244QPWREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC244QPWREP 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 SN74HC244QPWREP?
For technical support, including SN74HC244QPWREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC244QPWREP requirements.
6.How does Aetrix verify that SN74HC244QPWREP is sourced from the original manufacturer or authorized distributors?
All SN74HC244QPWREP 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 SN74HC244QPWREP meets industry standards.
7.What is the process for return or replacement of SN74HC244QPWREP?
All SN74HC244QPWREP units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC244QPWREP, 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 SN74HC244QPWREP part is unused and in its original packaging.
Return procedure for SN74HC244QPWREP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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