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Texas Instruments SN74HCT244QPWREP
- Part No.:
- SN74HCT244QPWREP
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HCT244QPWREP.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,985
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Product details
Overview
SN74HCT244QPWREP from Texas Instruments is an octal 3-state noninverting buffer/driver IC, organized as two independent 4-bit sections with separate output-enable (OE) controls. It operates from 4.5 V to 5.5 V, delivers ±6-mA output drive at 5 V, exhibits typical propagation delay of 13 ns, and supports extended temperature range from −40°C to 125°C. It is used in memory address buffering, bus driving, and clock distribution in industrial control and avionics systems.
For engineers reviewing the SN74HCT244QPWREP datasheet, SN74HCT244QPWREP pinout, SN74HCT244QPWREP application, or SN74HCT244QPWREP equivalent, key selection criteria include TTL-compatible inputs, high-current 3-state outputs capable of driving 15 LSTTL loads, low ICC (160 µA max), and TSSOP-20 packaging qualified for harsh-environment operation.
Technical Context
This device implements dual 4-bit noninverting buffers with independent active-low OE controls per section (1OE and 2OE). Each output enters high-impedance state when its respective OE is high, enabling bidirectional bus isolation without external logic.
It uses HCT logic family architecture-CMOS input stage with TTL voltage thresholds (VIH = 2 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V) and bipolar-compatible output drivers. Propagation delay (tpd) and enable/disable timing (ten/tdis) are specified across CL = 50 pF and 150 pF loads, supporting reliable timing in memory and peripheral interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with 5-V TTL and mixed-voltage systems without level shifters. |
| Output Drive | ±6 mA at 5 V - sufficient to directly drive 15 LSTTL loads, eliminating need for external buffer stages. |
| Propagation Delay | 13 ns typical (VCC = 5.5 V, CL = 50 pF) - enables use in sub-40-MHz synchronous bus applications. |
| Input Thresholds | VIH = 2 V min, VIL = 0.8 V max - guarantees interoperability with standard TTL outputs without interface logic. |
| Quiescent Current | ICC ≤ 160 µA max - supports low-power standby modes in always-on industrial controllers. |
| Operating Temperature | −40°C to 125°C - qualified per JEDEC extended-temperature standards including HAST and temperature cycling. |
| 3-State Leakage | IOZ ≤ ±10 µA max (VCC = 5.5 V) - prevents bus contention and signal corruption during high-Z transitions. |
Pinout & Package
TSSOP-20 package (PW), 6.5 mm × 4.4 mm footprint, 1.2 mm max height, 0.65 mm lead pitch, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output-enable control | Independent gating of each 4-bit section; high = high-Z output, low = enabled noninverting pass-through. |
| 1A1–1A4, 2A1–2A4 | Buffer input terminals | Eight TTL-compatible digital inputs, internally routed to corresponding Y outputs when OE is asserted. |
| 1Y1–1Y4, 2Y1–2Y4 | Buffer output terminals | Eight 3-state noninverting outputs; drive bus lines or memory address registers with ±6-mA capability. |
| VCC (Pin 19), GND (Pin 10) | Power supply terminals | Single 5-V supply rail; decoupling required within 10 mm of VCC/GND pins to maintain switching noise margin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit sections | Enables selective bus segmentation - e.g., isolate data vs. address paths using separate OE signals. |
| TTL-input compatible thresholds | Eliminates need for level-shifting circuitry when interfacing with legacy 74LS or microcontroller GPIOs. |
| High-current 3-state outputs | Drives up to 15 LSTTL loads per output, reducing fanout limitations in dense backplane or PCB trace routing. |
| Low ICC and IOZ | Minimizes system-level standby power and prevents leakage-induced bus float in powered-down subsystems. |
| Controlled baseline & DMS support | Guarantees long-term supply continuity and consistent parametric performance across production lots. |
Applications
| Industrial PLC Backplanes | Aerospace Avionics Data Buses |
|---|---|
|
Use Scenario: Buffering and isolating memory-mapped I/O address lines between CPU and peripheral modules in modular PLC racks. IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing controlled bus access with independent section enables for read/write arbitration. Use Value: ±6-mA drive ensures signal integrity over 15-cm backplane traces; −40°C to 125°C rating sustains operation in uncooled enclosures. |
Use Scenario: Driving ARINC 429 or MIL-STD-1553B bus transceiver enable lines and status latches in flight control computers. IC Role / Device Role / Timing Role: Level-translating buffer with precise enable timing (ten = 19 ns typ) synchronizing bus arbitration windows. Use Value: Low tpd (13 ns) and tight timing specs meet deterministic latency requirements; qualified extended-temp operation meets DO-160 Section 22. |
| Ruggedized Medical Imaging Controllers | Defense Radar Signal Processing Chassis |
|
Use Scenario: Isolating FPGA configuration address/data buses from flash memory and FPGA JTAG boundary-scan chains in MRI subsystems. IC Role / Device Role / Timing Role: Dual-section buffer enabling hot-swap-safe memory access while preserving JTAG path integrity via independent OE control. Use Value: High-Z leakage < ±10 µA prevents false triggering on shared scan chains; 125°C rating accommodates sealed, convection-cooled enclosures. |
Use Scenario: Interfacing high-speed ADC/DAC data lanes to FPGA-based beamforming logic in ground-based radar front ends. IC Role / Device Role / Timing Role: Synchronizing parallel data transfers between analog front-end ASICs and processing FPGAs using matched-propagation paths. Use Value: Matched tpd across all eight channels (< 5 ns skew) maintains setup/hold margins at 20-MHz sampling rates; TSSOP-20 allows compact layout near ADCs. |
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 |
|---|---|---|---|
| SN74HCT244PWR | Same logic function and pinout; commercial temp range (−40°C to 85°C); not enhanced-product qualified. | Lacks extended-temperature qualification, DMS support, and controlled baseline - unsuitable for aerospace or military deployments. | Select SN74HCT244PWR only for cost-sensitive commercial designs where extended reliability and supply continuity are not required. |
| SN74ACT244PWRE4 | ACT family: higher speed (tpd = 9 ns typ), wider VCC range (4.5 V–5.5 V), but VIH/VIL thresholds differ (VIH = 2.0 V min, same; VIL = 0.8 V max, same). | Higher drive (±24 mA) increases noise coupling risk on shared buses; requires stricter layout controls for EMI compliance. | Choose SN74ACT244PWRE4 only when sub-10-ns timing is mandatory and board-level noise mitigation is implemented. |
Compared with SN74HCT244PWR and SN74ACT244PWRE4, the SN74HCT244QPWREP uniquely combines military-grade reliability (QML-qualified baseline), extended temperature operation, and proven 3-state bus-driving performance - making it the sole option for DO-160 or MIL-STD-810G-certified platforms requiring zero-supply-risk sourcing.
Availability
SN74HCT244QPWREP is available at Aetrix Electronics and suitable for industrial PLC backplanes, aerospace avionics data buses, and ruggedized medical imaging controllers requiring stable component supply across extended product lifecycles.
Supply support for SN74HCT244QPWREP 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 heritage in high-reliability interface ICs.
The SN74HCT244QPWREP belongs to TI's enhanced-product (EP) logic portfolio, designed specifically for mission-critical applications demanding guaranteed supply, extended temperature operation, and full DMS traceability.
FAQ
What is the maximum operating temperature of the SN74HCT244QPWREP?
The SN74HCT244QPWREP is rated for continuous operation from −40°C to +125°C ambient temperature. This extended range is validated per JEDEC standards including biased 85/85 testing, temperature cycling, and HAST, making it suitable for under-hood automotive, avionics, and industrial environments where thermal management is constrained. The SN74HCT244QPWREP maintains full electrical specifications across this entire range.
Does the SN74HCT244QPWREP support true 5-V TTL interfacing?
Yes, the SN74HCT244QPWREP features TTL-compatible input thresholds: VIH ≥ 2.0 V and VIL ≤ 0.8 V at VCC = 4.5 V to 5.5 V. Its outputs deliver ±6 mA at 5 V, matching standard TTL drive strength. This allows direct connection to legacy 74LS devices and microcontrollers without level-shifting circuitry - a key design advantage confirmed in the SN74HCT244QPWREP datasheet's recommended operating conditions table.
How many independent 3-state sections does the SN74HCT244QPWREP contain?
The SN74HCT244QPWREP contains two independent 4-bit 3-state noninverting buffer sections: Section 1 (pins 1A1–1A4 → 1Y1–1Y4, controlled by 1OE) and Section 2 (pins 2A1–2A4 → 2Y1–2Y4, controlled by 2OE). This dual-section architecture enables selective bus isolation - for example, enabling address lines while disabling data lines - without requiring additional logic or control signals beyond the two OE inputs.
What is the typical propagation delay of the SN74HCT244QPWREP at 5.5 V?
The typical propagation delay (tpd) of the SN74HCT244QPWREP is 13 ns when VCC = 5.5 V and CL = 50 pF, as specified in the switching characteristics table of the official datasheet (SCLS562). This value represents the time from input transition to valid output transition under standard test load conditions and is guaranteed not to exceed 38 ns across the full operating temperature and voltage range.
Is the SN74HCT244QPWREP pin-compatible with standard SN74HCT244 variants?
Yes, the SN74HCT244QPWREP uses the TSSOP-20 (PW) package with identical pinout to the commercial SN74HCT244PWR and automotive SN74HCT244-Q1 variants. Pin functions - including 1OE, 1A1–1A4, 1Y1–1Y4, 2OE, 2A1–2A4, 2Y1–2Y4, VCC, and GND - match exactly. However, due to its enhanced-product qualification, the SN74HCT244QPWREP must be selected explicitly for applications requiring extended temperature, DMS, or controlled-baseline assurance.
SN74HCT244QPWREP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74HCT244QPWREP FAQ
1.How can I place an order for SN74HCT244QPWREP through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT244QPWREP 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 SN74HCT244QPWREP reliable?
The price and inventory of SN74HCT244QPWREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT244QPWREP is usually 5 days.
3.What payment methods are accepted for SN74HCT244QPWREP?
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4.How is shipping managed for SN74HCT244QPWREP?
SN74HCT244QPWREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT244QPWREP 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 SN74HCT244QPWREP?
For technical support, including SN74HCT244QPWREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT244QPWREP requirements.
6.How does Aetrix verify that SN74HCT244QPWREP is sourced from the original manufacturer or authorized distributors?
All SN74HCT244QPWREP 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 SN74HCT244QPWREP meets industry standards.
7.What is the process for return or replacement of SN74HCT244QPWREP?
All SN74HCT244QPWREP units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT244QPWREP, 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 SN74HCT244QPWREP part is unused and in its original packaging.
Return procedure for SN74HCT244QPWREP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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