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Texas Instruments 74AHCT16244DLRG4
- Part No.:
- 74AHCT16244DLRG4
- Manufacturer:
- Texas Instruments
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
74AHCT16244DLRG4.pdf
- Description:
- IC BUFF/DVR TRI-ST 16BIT 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
74AHCT16244DLRG4 from Texas Instruments is a 16-bit noninverting 3-state buffer/driver IC with four independent 4-bit sections, TTL-compatible inputs (VIH = 2 V, VIL = 0.8 V), 5-V supply operation, ±25 mA output drive per channel, and propagation delay of 5.4 ns (typ) at CL = 15 pF - used in memory address buffering, bus interfacing, and level translation between 3.3-V logic and 5-V systems.
For engineers reviewing the 74AHCT16244DLRG4 datasheet, 74AHCT16244DLRG4 pinout, 74AHCT16244DLRG4 application, or 74AHCT16244DLRG4 equivalent, this page delivers verified functional modes, thermal metrics (RθJA = 64.6°C/W), noise immunity specs (VOL(P) = 0.7 V), true-output behavior, and OE-controlled 3-state timing for industrial bus design and legacy system upgrades.
Technical Context
The 74AHCT16244DLRG4 implements four independent 4-bit noninverting buffers, each with active-low output-enable (OE) control and symmetrical drive capability. Its EPIC™ CMOS process ensures latch-up immunity >250 mA and ESD protection >2000 V per MIL-STD-883.
It operates across –40°C to 125°C with 4.5–5.5 V supply, supports up-translation from 3.3-V logic via TTL-compatible inputs, and features distributed VCC/GND pins plus flow-through architecture to minimize switching noise and optimize PCB layout routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - enables robust operation in noisy 5-V industrial rails |
| Input Thresholds | VIH = 2 V, VIL = 0.8 V - guarantees reliable interfacing with 3.3-V CMOS and legacy TTL sources |
| Output Drive | ±25 mA per Y output - sufficient for driving multiple LSTTL loads or moderate-capacitance buses |
| Propagation Delay | tPLH/tPHL = 5.4 ns (typ) at CL = 15 pF - supports >100 MHz bus toggle rates in low-load configurations |
| 3-State Enable Time | tPZH/tPZL = 7.7 ns (typ) at CL = 15 pF - ensures fast bus release for time-critical arbitration |
| Thermal Resistance | RθJA = 64.6°C/W (DL package) - defines maximum power dissipation under natural convection |
| ESD Rating | 2000 V HBM - meets standard handling requirements without special ESD controls |
Pinout & Package
74AHCT16244DLRG4 uses a 48-pin SSOP (Shrink Small Outline Package) with 0.5-mm pitch, 12.50 mm × 6.10 mm body size, and 1.2-mm max height - optimized for high-density board layouts with improved thermal performance over standard SOIC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-low output enable | Controls 3-state output of corresponding 4-bit section; tie to VCC via pullup for power-up high-Z safety |
| 1A1–1A4, 2A1–2A4, 3A1–3A4, 4A1–4A4 | Buffer input | TTL-compatible data inputs; must be held at VCC or GND if unused to prevent floating states |
| 1Y1–1Y4, 2Y1–2Y4, 3Y1–3Y4, 4Y1–4Y4 | True noninverting output | Drive-bidirectional bus lines or address paths; each capable of ±25 mA sink/source |
| VCC (Pins 7, 18, 31, 42) | Power supply | Distributed 5-V supply connections reduce simultaneous switching noise and improve decoupling efficiency |
| GND (Pins 4, 10, 15, 21, 28, 34, 39, 45) | Ground reference | Eight dedicated ground pins minimize ground bounce and support stable high-speed switching |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Input-to-output signal path aligned across package edges - simplifies layer routing and reduces trace crossovers |
| Distributed VCC/GND | Four VCC and eight GND pins - lowers impedance of power delivery network and suppresses ground bounce |
| TTL-voltage compatibility | Accepts 3.3-V logic high (≥2 V) directly - eliminates level-shifter need in mixed-voltage systems |
| Slow edge rate control | Controlled slew minimizes overshoot/undershoot - critical for clean signal integrity on unterminated stubs |
| Latch-up immunity | Exceeds 250 mA per JESD17 - ensures survivability in transient fault conditions |
Applications
| Memory Address Buffering | Industrial Bus Interface |
|---|---|
Use Scenario: Driving 16-bit address lines from microcontroller to SRAM or Flash memory in embedded controllers. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address bus from memory array; OE synchronized to memory access strobes. Use Value: Prevents bus contention during memory refresh cycles and enables multi-master arbitration via controlled high-Z states. | Use Scenario: Interfacing FPGA I/O banks operating at 3.3 V to legacy 5-V peripheral buses (e.g., ISA, PC/104). IC Role / Device Role / Timing Role: Level-translating buffer with TTL-compatible inputs and 5-V CMOS outputs; OE managed by FPGA control logic. Use Value: Eliminates external level shifters while maintaining signal integrity and timing margins up to 100 MHz. |
| Telecom Backplane Driver | Motor Control Logic Interface |
Use Scenario: Buffering configuration signals (e.g., register writes, mode selects) across long backplane traces in base station equipment. IC Role / Device Role / Timing Role: Low-noise 16-bit driver with distributed power pins - placed near connector to drive parallel control bus. Use Value: Reduces simultaneous switching noise (SSN) and maintains <100 ps skew across all 16 bits for deterministic timing. | Use Scenario: Isolating microcontroller GPIOs from motor driver enable/control inputs subject to voltage transients. IC Role / Device Role / Timing Role: Robust 3-state interface with 250 mA latch-up immunity - placed between MCU and gate-driver ICs. Use Value: Survives inductive kickback events and prevents MCU reset due to ground disturbance during motor commutation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT16244DGGR | TSSOP-48 package (12.5 × 6.1 mm → 12.5 × 4.4 mm); RθJA = 72.5°C/W vs. 64.6°C/W | Better board area efficiency but higher thermal resistance - requires tighter airflow or lower ambient | Preferred for space-constrained designs where thermal margin allows |
| SN74AHCT16244DGVR | TVSOP-48 package (9.7 × 4.4 mm); RθJA = 83.5°C/W; thinner profile (1.2 mm max) | Ultra-low profile for stacked modules; reduced thermal mass increases sensitivity to sustained load current | Selected when Z-height is critical and average output loading remains ≤10 mA/channel |
Compared with SN74AHCT16244DGGR and SN74AHCT16244DGVR, the 74AHCT16244DLRG4 offers the lowest junction-to-ambient thermal resistance (64.6°C/W) among SSOP/TSSOP/TVSOP variants - making it optimal for thermally demanding industrial environments with continuous 16-bit bus activity.
Availability
74AHCT16244DLRG4 is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and embedded control systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 74AHCT16244DLRG4 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and industrial-grade qualification.
The SN74AHCT16244 family belongs to TI's Widebus™ portfolio - engineered for high-density bus interface applications requiring noise-immune 3-state control, wide temperature operation, and seamless integration with legacy TTL and modern low-voltage logic.
FAQ
What is the recommended power supply bypassing scheme for 74AHCT16244DLRG4?
Each VCC pin (7, 18, 31, 42) requires a local 0.01 µF or 0.022 µF ceramic capacitor placed as close as possible to the pin. A shared 0.1 µF + 1 µF bulk capacitor pair may be added near the device for broadband noise suppression. This configuration mitigates simultaneous switching noise and ensures stable 5-V rail integrity during 16-bit output transitions in the 74AHCT16244DLRG4.
How does the 74AHCT16244DLRG4 handle unused inputs?
All unused inputs of the 74AHCT16244DLRG4 must be tied to either VCC or GND - never left floating - to prevent undefined logic states, increased ICC, or oscillation. The choice depends on desired default output behavior: tying OE pins to VCC ensures power-up high-impedance, while tying A inputs to GND avoids spurious activation. This requirement is explicitly stated in TI's SCBA004 application report and applies to every input in the 74AHCT16244DLRG4.
Can 74AHCT16244DLRG4 safely interface 3.3-V FPGA outputs to a 5-V bus?
Yes - the 74AHCT16244DLRG4 accepts VIH ≥ 2 V and VIL ≤ 0.8 V, fully compatible with 3.3-V CMOS logic levels. Its TTL-compatible inputs eliminate external level shifters, and its 5-V outputs drive standard LSTTL loads. However, ensure FPGA outputs do not exceed 5.5 V (absolute max), and observe the 25 mA per-output limit when driving heavy capacitive or resistive loads on the 5-V bus.
What is the maximum clock/data toggle frequency supported by 74AHCT16244DLRG4?
The 74AHCT16244DLRG4 does not specify a maximum toggle frequency directly, but its typical propagation delay is 5.4 ns (CL = 15 pF) and 3-state disable time is 7.7 ns. For clean signal integrity without excessive ringing, practical bus operation is limited to ≤100 MHz under light loads (<30 pF). At higher frequencies or heavier loads (e.g., CL = 50 pF), tPLH rises to 9.5 ns, reducing usable bandwidth - always verify timing margins in the final 74AHCT16244DLRG4 layout.
Is 74AHCT16244DLRG4 pin-compatible with older 74ACT or 74F series 16-bit buffers?
No - the 74AHCT16244DLRG4 has a unique 48-pin SSOP footprint and functional pinout (e.g., distributed VCC/GND, flow-through layout) not shared with 24-pin 74ACT244 or 28-pin 74F244 devices. While logical function (16-bit 3-state noninverting buffer) is similar, mechanical and electrical pin mapping differs entirely. Migration requires PCB redesign; no drop-in replacement exists between 74AHCT16244DLRG4 and earlier families.
74AHCT16244DLRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 4
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
74AHCT16244DLRG4 FAQ
1.How can I place an order for 74AHCT16244DLRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHCT16244DLRG4 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 74AHCT16244DLRG4 reliable?
The price and inventory of 74AHCT16244DLRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT16244DLRG4 is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT16244DLRG4 transactions.
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74AHCT16244DLRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHCT16244DLRG4 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 74AHCT16244DLRG4?
For technical support, including 74AHCT16244DLRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT16244DLRG4 requirements.
6.How does Aetrix verify that 74AHCT16244DLRG4 is sourced from the original manufacturer or authorized distributors?
All 74AHCT16244DLRG4 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 74AHCT16244DLRG4 meets industry standards.
7.What is the process for return or replacement of 74AHCT16244DLRG4?
All 74AHCT16244DLRG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT16244DLRG4, 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 74AHCT16244DLRG4 part is unused and in its original packaging.
Return procedure for 74AHCT16244DLRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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