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Texas Instruments SN74HC244QPWREPG4
- Part No.:
- SN74HC244QPWREPG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HC244QPWREPG4.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,437
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Product details
Overview
SN74HC244QPWREPG4 from Texas Instruments is an octal 3-state noninverting buffer/driver IC designed for memory address buffering, bus driving, and clock distribution in industrial and automotive systems. It features two independent 4-bit sections with separate output-enable (OE) controls, operates from 2 V to 6 V, delivers ±7.8 mA output drive at 4.5 V, and supports −40°C to 125°C extended temperature operation.
For engineers reviewing the SN74HC244QPWREPG4 datasheet, SN74HC244QPWREPG4 pinout, SN74HC244QPWREPG4 application, or SN74HC244QPWREPG4 equivalent, this device is selected for high-density bus interface design requiring low-power CMOS logic compatibility, precise 3-state timing control, and robust thermal performance in TSSOP-20 packaging.
Technical Context
The SN74HC244QPWREPG4 implements dual 4-bit noninverting buffers with independent active-low output-enable inputs (1OE, 2OE), enabling selective bus isolation without signal inversion. Each buffer section drives up to 15 LSTTL loads and maintains rail-to-rail output swing across its 2–6 V supply range.
Its propagation delay is 11–29 ns (VCC = 6 V, CL = 50 pF), with enable/disable times of 13–38 ns, ensuring tight timing alignment in synchronous bus architectures. The device uses silicon-gate CMOS technology for low static current (ICC ≤ 160 µA) and high noise immunity (VIH ≥ 3.15 V at VCC = 4.5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | High-speed CMOS (HC), compatible with TTL input thresholds and CMOS output levels |
| Supply Voltage Range | 2 V to 6 V - supports mixed-voltage system interfacing and brown-out resilience |
| Output Drive Strength | ±7.8 mA at VCC = 6 V - sufficient to drive 15 LSTTL loads or terminate short PCB traces |
| Propagation Delay (tpd) | 11–29 ns (VCC = 6 V, CL = 50 pF) - enables reliable operation in 20+ MHz bus clock domains |
| 3-State Enable/Disable Time | 13–38 ns (ten/tdis, VCC = 6 V, CL = 50 pF) - minimizes bus contention during dynamic bus arbitration |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| Input Capacitance (Ci) | ≤10 pF - reduces loading on upstream drivers and preserves signal edge integrity |
Pinout & Package
TSSOP-20 package (PW), 6.5 mm × 4.4 mm × 1.2 mm max height, lead pitch 0.65 mm, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Section 1 Inputs (1A1–1A4) | Noninverting data inputs for first 4-bit buffer group; accept standard CMOS/TTL logic levels |
| 9 | GND | Ground reference for all internal circuitry and I/O; must be low-impedance connection |
| 10, 11, 12, 13 | Section 1 Outputs (1Y1–1Y4) | 3-state buffered outputs for first group; high-impedance when 1OE = high |
| 14 | VCC | Positive supply rail (2–6 V); requires local 0.1 µF decoupling near pin |
| 15, 16, 17, 18 | Section 2 Inputs (2A1–2A4) | Noninverting data inputs for second 4-bit buffer group; electrically isolated from Section 1 |
| 19 | 2OE | Active-low enable for Section 2 outputs; tied low to activate, high to tri-state |
| 20 | 1OE | Active-low enable for Section 1 outputs; independent control enables staggered bus access |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit buffers | Enables split-bus architecture with separate enable control per group - critical for memory-mapped I/O partitioning |
| High-current 3-state outputs | ±7.8 mA drive at 6 V allows direct connection to legacy LSTTL loads without level-shifting or external drivers |
| Extended temperature qualification | −40°C to +125°C operation with JEDEC-qualified reliability (HAST, temp cycle, bond intermetallic life) |
| Low power consumption | ICC ≤ 160 µA at 6 V ensures minimal quiescent load in always-on subsystems like CAN gateway controllers |
| Controlled output transition times | tt ≤ 15 ns (VCC = 6 V, CL = 50 pF) suppresses EMI and prevents false triggering on sensitive analog rails |
Applications
| Memory Address Buffering | Industrial Bus Interface |
|---|---|
|
Use Scenario: Isolating microcontroller address lines from multiple peripheral devices sharing a common data/address bus in PLC backplane designs. IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing bidirectional address line isolation with independent OE control per 4-bit segment. Use Value: Prevents bus contention during peripheral selection while maintaining nanosecond-level timing alignment between address and control signals. |
Use Scenario: Driving RS-485 transceiver enable/control lines and isolated SPI bus segments in factory automation I/O modules. IC Role / Device Role / Timing Role: Level-translating and fanout buffer for digital control signals operating across 3.3 V and 5 V domains. Use Value: Eliminates need for discrete level shifters; ±7.8 mA drive ensures fast edge rates into capacitive transceiver inputs. |
| Automotive Powertrain Control | Test Equipment Signal Conditioning |
|
Use Scenario: Routing sensor status flags and diagnostic enable signals from MCU to multiple engine control actuators in under-hood ECUs. IC Role / Device Role / Timing Role: High-reliability buffer with extended temperature rating, used for safety-critical control path conditioning. Use Value: Qualified to −40°C to +125°C with enhanced DMS support ensures long-term availability and traceable sourcing for ASIL-B systems. |
Use Scenario: Conditioning parallel test bus signals (e.g., JTAG, boundary scan) in automated test equipment where signal integrity and channel isolation are critical. IC Role / Device Role / Timing Role: Low-capacitance (≤10 pF) buffer minimizing skew across 8-bit parallel paths during high-speed pattern generation. Use Value: Propagation delay matching <5 ns between channels enables deterministic timing capture at >20 MHz test clock rates. |
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 V min), identical pinout and drive strength | Better suited for mixed 5 V TTL/CMOS systems where input noise margin must match legacy TTL logic | Select when interfacing directly to 5 V TTL outputs without level translation |
| SN74LVC244APWR | Lower VCC range (1.65–3.6 V), higher speed (tpd = 5.4 ns @ 3.3 V), but rated only to 85°C | Optimized for portable/embedded 3.3 V systems requiring faster switching and lower power | Select for battery-powered or space-constrained designs where extended temperature is not required |
Compared with SN74HC244QPWREPG4, SN74HCT244QPWREP offers superior noise immunity in 5 V TTL environments, while SN74LVC244APWR provides faster timing and lower voltage operation at the cost of industrial temperature support - making SN74HC244QPWREPG4 the optimal choice for ruggedized 2–6 V systems demanding −40°C to 125°C reliability.
Availability
SN74HC244QPWREPG4 is available at Aetrix Electronics and suitable for industrial control systems, automotive electronic control units, and test instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74HC244QPWREPG4 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 high-reliability IC design.
The SN74HC244QPWREPG4 belongs to TI's enhanced-product (EP) logic family, engineered for mission-critical applications in automotive, defense, and industrial sectors where extended temperature operation and controlled baseline manufacturing are mandatory.
FAQ
What is the maximum supply voltage rating for SN74HC244QPWREPG4?
The absolute maximum supply voltage (VCC) for SN74HC244QPWREPG4 is 7 V. However, the recommended operating range is 2 V to 6 V per the datasheet. Operating continuously above 6 V risks permanent damage and violates JEDEC qualification limits; sustained use at 6 V is fully supported and validated for −40°C to 125°C operation.
Does SN74HC244QPWREPG4 support true 3-state (high-impedance) outputs?
Yes, SN74HC244QPWREPG4 provides true 3-state outputs. When either 1OE or 2OE is driven high, the corresponding Y outputs enter high-impedance mode (IOZ ≤ ±10 µA at 6 V), electrically disconnecting them from the bus. This behavior is verified across temperature and voltage ranges and is fundamental to its use in shared bus architectures.
What is the pin-compatible replacement for SN74HC244QPWREPG4 in SOIC packaging?
The pin-compatible SOIC-20 replacement is SN74HC244QDWREP. It shares identical logic function, pinout, electrical specifications, and −40°C to 125°C temperature rating, differing only in package (DW vs PW) and thermal impedance (58°C/W vs 83°C/W). No PCB redesign is needed beyond footprint adaptation.
Can SN74HC244QPWREPG4 drive 5 V TTL loads directly?
Yes, SN74HC244QPWREPG4 can directly drive standard 5 V TTL loads. Its VOH ≥ 3.98 V (at IOH = −6 mA, VCC = 4.5 V) and VOL ≤ 0.26 V (at IOL = 6 mA) exceed TTL input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V), and its ±7.8 mA drive capability meets or exceeds the 5 V TTL fanout requirement of 10–15 loads.
Is SN74HC244QPWREPG4 compliant with automotive AEC-Q100 standards?
No, SN74HC244QPWREPG4 is not AEC-Q100 qualified. It is an enhanced-product (EP) device qualified to extended temperature (−40°C to 125°C) and reliability standards per JEDEC, but lacks the full automotive qualification stack. For AEC-Q100 Grade 2 (−40°C to 105°C), use SN74HC244-Q1 instead - which shares logic functionality but undergoes additional stress testing and lot traceability.
SN74HC244QPWREPG4 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:
- 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:
- 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
SN74HC244QPWREPG4 FAQ
1.How can I place an order for SN74HC244QPWREPG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC244QPWREPG4 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 SN74HC244QPWREPG4 reliable?
The price and inventory of SN74HC244QPWREPG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC244QPWREPG4 is usually 5 days.
3.What payment methods are accepted for SN74HC244QPWREPG4?
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4.How is shipping managed for SN74HC244QPWREPG4?
SN74HC244QPWREPG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC244QPWREPG4 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 SN74HC244QPWREPG4?
For technical support, including SN74HC244QPWREPG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC244QPWREPG4 requirements.
6.How does Aetrix verify that SN74HC244QPWREPG4 is sourced from the original manufacturer or authorized distributors?
All SN74HC244QPWREPG4 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 SN74HC244QPWREPG4 meets industry standards.
7.What is the process for return or replacement of SN74HC244QPWREPG4?
All SN74HC244QPWREPG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC244QPWREPG4, 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 SN74HC244QPWREPG4 part is unused and in its original packaging.
Return procedure for SN74HC244QPWREPG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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