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Texas Instruments SN74AHCT16240DL
- Part No.:
- SN74AHCT16240DL
- Manufacturer:
- Texas Instruments
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74AHCT16240DL.pdf
- Description:
- IC BUFFER INVERT 5.5V 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,611
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Product details
Overview
SN74AHCT16240DL from Texas Instruments is a 16-bit inverting buffer/driver with 3-state outputs, designed for memory address driving, clock distribution, and bus interfacing in industrial embedded systems. It operates from 4.5 V to 5.5 V, supports TTL-level inputs, delivers ±8 mA output drive, and features symmetrical active-low OE controls per 4-bit section.
For engineers reviewing the SN74AHCT16240DL datasheet, SN74AHCT16240DL pinout, SN74AHCT16240DL application, or SN74AHCT16240DL equivalent, this page provides verified functional identity, DL-package–specific pin mapping, timing behavior at 5 V/15 pF and 50 pF loads, thermal resistance (63°C/W), and validated alternatives for bus buffering upgrades.
Technical Context
The SN74AHCT16240DL implements four independent 4-bit inverting buffers, each with dedicated active-low output-enable (OE) control. Its EPIC™ CMOS process ensures TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and rail-to-rail output swing under load.
It uses distributed VCC/GND pins to suppress high-speed switching noise and adopts a flow-through pinout architecture-inputs on one side, outputs on the opposite-to minimize PCB trace crossovers and signal integrity degradation in dense bus layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V logic rails and tolerance against supply ripple. |
| Input Compatibility | TTL-voltage compatible - Accepts 0.8 V / 2.0 V VIH/VIL thresholds without level-shifting circuitry. |
| Output Drive | ±8 mA at VCC = 4.5 V - Sufficient to drive 50-pF loads with <10.5 ns propagation delay (tPLH/tPHL). |
| 3-State Enable Timing | tPZH/tPLZ = 12 ns max (CL = 50 pF) - Enables fast bus arbitration and clean signal isolation during state transitions. |
| Thermal Resistance | θJA = 63°C/W (DL package) - Defines maximum power dissipation limit (≈160 mW at 50°C ambient) before thermal derating. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade operation without derating in typical control and instrumentation environments. |
| ESD Protection | ≥2000 V HBM - Meets MIL-STD-883 Method 3015, reducing susceptibility to handling-induced latch-up or gate oxide damage. |
Pinout & Package
SN74AHCT16240DL is housed in a 48-pin Shrink Small-Outline Package (SSOP-DL), 12.4 mm × 6.2 mm body, 0.5 mm pitch, 1.2 mm max height, JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-low output-enable control | Independent enables per 4-bit section; tie to VCC via pullup for power-up high-Z safety. |
| 1A1–1A4, 2A1–2A4, 3A1–3A4, 4A1–4A4 | Buffer inputs | 16 TTL-compatible inputs grouped into four 4-bit banks; inverted logic path to corresponding Y outputs. |
| 1Y1–1Y4, 2Y1–2Y4, 3Y1–3Y4, 4Y1–4Y4 | Inverting 3-state outputs | 16 buffered, inverted outputs; high-impedance when respective OE = high. |
| VCC (Pins 7, 21, 34, 47) | Power supply | Distributed VCC pins reduce simultaneous switching noise and improve PDN impedance across wide frequency range. |
| GND (Pins 4, 10, 15, 27, 32, 39, 44) | Ground reference | Seven GND pins provide low-inductance return paths and support stable 3-state transition margins. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout architecture | Input and output pins placed on opposite sides of package - eliminates layer jumps and reduces crosstalk in parallel bus routing. |
| Distributed VCC/GND network | Four VCC and seven GND pins - lowers effective power delivery impedance and suppresses ground bounce during 16-bit simultaneous switching. |
| Symmetrical active-low OE inputs | Four independent OE pins (1OE–4OE), each controlling 4 outputs - enables granular bus partitioning and partial enable/disable sequencing. |
| Latch-up immunity | Exceeds 250 mA per JESD 17 - ensures robustness against transient current injection in noisy industrial environments. |
| EPIC™ process technology | Enhanced-Performance Implanted CMOS - delivers TTL-compatible input thresholds while maintaining CMOS power efficiency and noise margin. |
Applications
| Memory Address Buffering | Industrial Bus Transceiver Interface |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a microcontroller to SRAM or Flash memory in programmable logic controllers. IC Role / Device Role / Timing Role: Inverting 3-state buffer isolating CPU address bus from memory array; OE synchronized with memory write strobe. Use Value: Prevents bus contention during memory access cycles; ±8 mA drive sustains signal integrity over 10-cm PCB traces at 20 MHz. |
Use Scenario: Bidirectional data buffering between an FPGA and legacy parallel peripheral (e.g., LCD controller or ADC interface). IC Role / Device Role / Timing Role: Four independent 4-bit sections allow selective enable/disable of data lanes; inverting logic matches peripheral polarity requirements. Use Value: Eliminates need for discrete inverters; flow-through layout simplifies FPGA-to-peripheral routing on 4-layer boards. |
| Clock Distribution Network | Test Equipment Signal Conditioning |
|
Use Scenario: Fan-out and level translation of a 5-V system clock to multiple synchronous logic blocks in automated test equipment. IC Role / Device Role / Timing Role: Low-skew 16-bit buffer with matched tPLH/tPHL (≤9.5 ns @ 50 pF); OE used for clock gating during self-test modes. Use Value: Maintains <1 ns inter-output skew across all 16 outputs, preserving setup/hold timing margins for downstream flip-flops. |
Use Scenario: Isolating and conditioning digital stimulus signals in boundary-scan test adapters or JTAG chain extenders. IC Role / Device Role / Timing Role: 3-state outputs allow dynamic reconfiguration of test signal paths; high-impedance mode prevents back-driving during idle states. Use Value: Enables hot-swappable test fixture modules without requiring external isolation switches or relays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT16244DLR | Non-inverting output logic; identical pinout, timing, and drive strength. | Required where signal polarity must be preserved (e.g., direct connection to non-inverting receivers). | Select when system-level logic does not require inversion - avoids adding external inverters or modifying firmware polarity handling. |
| SN74LVC16244ADGGR | 3.3-V only operation (1.65–3.6 V); lower VCC, higher speed (tPD ≈ 4.2 ns), but no TTL input compatibility. | Suitable for mixed-voltage 3.3-V domains with modern FPGAs or SoCs; incompatible with 5-V TTL sources. | Choose for new 3.3-V designs prioritizing speed and power; avoid if interfacing legacy 5-V peripherals or microcontrollers. |
Compared with SN74AHCT16240DL, SN74AHCT16244DLR preserves pin compatibility and voltage specs while removing inversion - ideal for polarity-sensitive buses; SN74LVC16244ADGGR offers faster switching and lower power but mandates full 3.3-V system integration and forfeits TTL input support.
Availability
SN74AHCT16240DL is available at Aetrix Electronics and suitable for industrial control systems, test equipment signal routing, and memory subsystem buffering requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHCT16240DL 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 industrial and automotive-grade IC design.
The SN74AHCT16240DL belongs to TI's Widebus™ family of high-density bus interface devices, engineered specifically to replace discrete transistor-transistor logic (TTL) buffers in memory, clock, and data-path applications while delivering CMOS efficiency and noise immunity.
FAQ
What is the function of the OE pins on the SN74AHCT16240DL?
The SN74AHCT16240DL has four active-low output-enable (OE) pins - 1OE through 4OE - each controlling a 4-bit buffer section. When an OE pin is low, its corresponding Y outputs reflect the inverted A inputs; when high, those outputs enter high-impedance state. This allows selective bus isolation and multi-drop sharing without contention. For safe power-up behavior, each OE should be pulled up to VCC via a resistor.
Does the SN74AHCT16240DL support 3.3-V input levels?
No - the SN74AHCT16240DL is designed for 5-V operation and requires TTL-compatible input thresholds: VIH = 2.0 V minimum and VIL = 0.8 V maximum. While it may function with 3.3-V logic highs in some cases, TI does not guarantee performance outside the specified 4.5–5.5 V VCC range and TTL input voltage window. For 3.3-V systems, consider SN74LVC16244ADGGR instead.
What is the maximum capacitive load the SN74AHCT16240DL can drive reliably?
The SN74AHCT16240DL is characterized for CL = 15 pF and CL = 50 pF loads. At 50 pF, propagation delays remain within 10.5 ns (tPLH/tPHL) and enable/disable times stay ≤13 ns. Driving >50 pF risks exceeding timing margins and increasing ground bounce; for heavier loads, add series termination or use a driver with higher IO capability.
Is the SN74AHCT16240DL pin-compatible with other Widebus™ 16-bit buffers?
Yes - the SN74AHCT16240DL shares identical 48-pin DL-package pinout with SN74AHCT16244DLR (non-inverting) and SN74AHCT16373DLR (latched version). All three support the same VCC/GND distribution, OE placement, and A/Y grouping. However, logic function differs: SN74AHCT16240DL inverts, SN74AHCT16244DLR does not, and SN74AHCT16373DLR adds transparent latching.
How does the SN74AHCT16240DL handle power-up sequencing?
The SN74AHCT16240DL has no internal power-on reset. To ensure outputs remain in high-impedance during power ramp-up, TI recommends tying all OE pins to VCC through external pullup resistors. The minimum resistor value depends on the driver's sink capability - typically ≥10 kΩ suffices for most microcontroller GPIOs. This prevents unintended bus contention before firmware initializes OE control.
SN74AHCT16240DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 4
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- 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
SN74AHCT16240DL FAQ
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5.How can I obtain technical support or documentation for SN74AHCT16240DL?
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6.How does Aetrix verify that SN74AHCT16240DL is sourced from the original manufacturer or authorized distributors?
All SN74AHCT16240DL 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 SN74AHCT16240DL meets industry standards.
7.What is the process for return or replacement of SN74AHCT16240DL?
All SN74AHCT16240DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT16240DL, 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 SN74AHCT16240DL part is unused and in its original packaging.
Return procedure for SN74AHCT16240DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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