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Texas Instruments SN74AHCT16540DGGR
- Part No.:
- SN74AHCT16540DGGR
- Manufacturer:
- Texas Instruments
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
SN74AHCT16540DGGR.pdf
- Description:
- IC BUFFER INVERT 5.5V 48TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74AHCT16540DGGR from Texas Instruments is a 16-bit noninverting buffer/driver with dual 3-state control (OE1/OE2), TTL-compatible inputs, and flow-through pinout in 48-pin TSSOP (DGG) package. It operates from 4.5 V to 5.5 V, delivers ±8 mA output drive, supports 15 pF load propagation delays as low as 1 ns (tPLH/tPHL), and is rated for –40°C to 85°C industrial temperature range - used in wide-data-path bus interfacing between FPGAs and memory subsystems.
For engineers reviewing the SN74AHCT16540DGGR datasheet, SN74AHCT16540DGGR pinout, SN74AHCT16540DGGR application, or SN74AHCT16540DGGR equivalent, key selection criteria include dual independent 3-state enable logic, distributed VCC/GND pins for noise suppression, EPIC™ process latch-up immunity (>250 mA), and compatibility with legacy TTL-level control signals in high-density PCB layouts.
Technical Context
The SN74AHCT16540DGGR implements two independent 8-bit noninverting buffer sections, each with a 2-input AND gate enabling logic (active-low OE1/OE2). Outputs enter high-impedance state if either OE input is high - enabling flexible bus arbitration. Its flow-through architecture places inputs on one side and outputs on the opposite side, minimizing trace crossovers.
Distributed VCC and GND pins (12 total: 6 VCC, 6 GND) reduce simultaneous switching noise; inputs tolerate TTL voltage thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V); and ESD protection exceeds 2000 V (HBM) and 200 V (MM). The device uses TI's EPIC™ implanted CMOS process for enhanced speed-power trade-off.
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 tolerates supply droop during transient loading. |
| Output Drive | ±8 mA - sufficient to drive 50-pF loads at ≤10 ns propagation delay while maintaining VOH ≥ 3.8 V and VOL ≤ 0.44 V. |
| Propagation Delay | 1 ns (min), 9.5 ns (max) at 15 pF - enables reliable operation in high-speed address/data bus applications up to ~100 MHz. |
| Input Compatibility | TTL-level (VIH ≥ 2 V, VIL ≤ 0.8 V) - allows direct interface with legacy 74LS/74ALS logic without level-shifting. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including motor control, PLC I/O modules, and instrumentation. |
| ESD Rating | 2000 V HBM, 200 V MM - meets IEC 61000-4-2 pre-compliance requirements for board-level handling robustness. |
| Latch-Up Immunity | >250 mA per JESD17 - prevents destructive failure during ground-bounce or hot-swap transients in backplane systems. |
Pinout & Package
SN74AHCT16540DGGR is housed in a 48-pin Thin Shrink Small-Outline Package (TSSOP, DGG), 12.6 mm × 6.2 mm × 1.2 mm max height, with 0.5 mm pitch, RoHS-compliant NiPdAu lead finish, and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE1, 1OE2, 2OE1, 2OE2 | Active-low 3-state enable inputs (2 per 8-bit section) | AND-gated control: either OE high forces all 8 corresponding outputs into high-Z - supports independent bus segment gating. |
| 1A1–1A8, 2A1–2A8 | Noninverting data inputs | Accept TTL-compatible signals; internally buffered with EPIC™ CMOS for low skew and high noise margin. |
| 1Y1–1Y8, 2Y1–2Y8 | Noninverting 3-state outputs | Drive bidirectional buses; output impedance >100 kΩ in disabled state to prevent contention. |
| VCC (Pins 7, 18, 29, 34, 41, 46) | Power supply | Distributed across package to minimize IR drop and simultaneous switching noise in high-frequency operation. |
| GND (Pins 4, 10, 15, 22, 31, 37) | Ground reference | Paired with VCC pins to form local power/ground loops - critical for signal integrity in dense routing. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Inputs on left (1–24), outputs on right (25–48) - eliminates layer jumps and reduces crosstalk in 16-bit parallel bus layout. |
| Dual independent 3-state control | Two 2-input AND gates (OE1/OE2 per section) - enables selective isolation of upper/lower byte without external logic. |
| Distributed VCC/GND | 6 VCC + 6 GND pins interleaved across body - lowers AC impedance and suppresses ground bounce in multi-bit switching. |
| TTL-input compatibility | VIL ≤ 0.8 V, VIH ≥ 2 V - interoperates with 74LS, microcontroller GPIOs, and FPGA I/O banks configured for 5-V tolerant mode. |
| EPIC™ process technology | Implanted CMOS with enhanced speed/power ratio - achieves 1 ns min tPLH while limiting ICC to 40 µA at 5.5 V static. |
Applications
| Memory Bus Interface | FPGA-to-ASIC Data Bridge |
|---|---|
Use Scenario: Interfacing SRAM or Flash memory with a microcontroller having limited drive strength on its data/address bus. IC Role / Device Role / Timing Role: Bidirectional buffer isolating memory bus segments; provides level translation and fanout amplification while enabling bus sharing via 3-state control. Use Value: Enables clean signal integrity on 16-bit parallel buses up to 100 MHz with <1 ns channel-to-channel skew and no external pull-ups required on OE lines when tied to VCC. | Use Scenario: Connecting an FPGA's general-purpose I/O bank to an ASIC requiring strict 5-V TTL signaling and precise timing alignment. IC Role / Device Role / Timing Role: Noninverting bus driver ensuring setup/hold compliance; dual OE control synchronizes data valid windows across byte lanes. Use Value: Delivers guaranteed tPLH/tPHL ≤ 9.5 ns at 50 pF load - meets timing closure for 20-ns cycle FPGA-to-ASIC handshaking protocols. |
| Industrial PLC I/O Module | Legacy System Bus Extender |
Use Scenario: Isolating field-side digital I/O signals from controller-side logic in programmable logic controllers subject to EMI and ground shift. IC Role / Device Role / Timing Role: High-noise-immunity buffer with latch-up protection; OE pins controlled by watchdog-timed enable pulses to prevent bus lockup. Use Value: Survives >250 mA latch-up events and 2000 V HBM ESD - eliminates field failures in factory automation cabinets with shared ground planes. | Use Scenario: Extending a vintage 16-bit ISA or VMEbus slot to support additional peripheral cards without modifying motherboard layout. IC Role / Device Role / Timing Role: Bus repeater with flow-through pinout - preserves original signal routing direction and minimizes added propagation delay. Use Value: Adds only 1–10 ns delay per path while maintaining full 16-bit width and TTL compatibility - avoids redesign of legacy backplane traces. |
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 | Noninverting, but with individual 3-state control per channel (16x OE) instead of dual 8-bit groups. | Better suited for fine-grained bus arbitration where per-line enable is required; higher pin count for control logic. | Choose SN74AHCT16244DGGR when independent gating of each of 16 lines is needed - not for grouped byte enable. |
| SN74LVC16244ADGGR | 3.3-V only (1.65–3.6 V), lower drive (±24 mA), higher speed (tPD ≤ 5.2 ns), but not TTL-input compatible. | Requires level-shifting for 5-V systems; optimized for modern low-voltage FPGAs and SoCs, not legacy TTL buses. | Choose SN74LVC16244ADGGR only in new 3.3-V designs with no TTL interface requirement - incompatible with 5-V control signals. |
Compared with SN74AHCT16244DGGR and SN74LVC16244ADGGR, the SN74AHCT16540DGGR uniquely balances 5-V TTL compatibility, grouped 8-bit 3-state control, and industrial temperature rating - making it irreplaceable in upgrades of legacy industrial controllers without board rework.
Availability
SN74AHCT16540DGGR is available at Aetrix Electronics and suitable for memory bus interface, FPGA-to-ASIC bridging, and industrial PLC I/O modules requiring stable component supply across extended product lifecycles.
Supply support for SN74AHCT16540DGGR 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 logic solutions with emphasis on reliability, longevity, and industrial-grade qualification.
The SN74AHCT16540DGGR belongs to TI's Widebus™ family of high-speed bus interface ICs, designed specifically for robust, noise-resistant data path expansion in industrial, automotive, and communications infrastructure equipment.
FAQ
What is the recommended power-up sequence for SN74AHCT16540DGGR to avoid bus contention?
TI recommends tying both OE1 and OE2 to VCC through a pullup resistor (minimum value determined by driver sink capability) during power-up and power-down. This ensures all outputs remain in high-impedance state until system logic asserts valid control - preventing glitches or contention on shared buses. The SN74AHCT16540DGGR does not include internal power-on reset, so external OE biasing is mandatory for safe initialization.
Does SN74AHCT16540DGGR support hot-swap operation?
The SN74AHCT16540DGGR features latch-up immunity exceeding 250 mA per JESD17 and ESD protection >2000 V HBM, making it robust against transient faults during live insertion. However, it lacks dedicated hot-swap control circuitry (e.g., slew-rate limiting or current limiting), so external current-limiting resistors or dedicated hot-swap controllers are advised when inserting into powered backplanes. The SN74AHCT16540DGGR itself will survive brief overcurrent events but should not be relied upon as a standalone hot-swap solution.
Can SN74AHCT16540DGGR drive a 50-pF load at 50 MHz?
Yes - the SN74AHCT16540DGGR guarantees tPLH/tPHL ≤ 10.5 ns and tPZH/tPHZ ≤ 13 ns into 50-pF loads at VCC = 5 V, supporting reliable operation up to ~50 MHz clocked bus systems. Measured noise characteristics (VOL(P) ≤ 0.7 V, VOH(V) ≥ 4.5 V) confirm signal margins remain adequate under dynamic loading. For sustained 50-MHz operation, ensure proper decoupling (0.1 µF ceramic per VCC pin) and controlled-impedance routing per TI's DGG package layout guidelines.
How are the dual OE inputs (OE1/OE2) logically combined in SN74AHCT16540DGGR?
In the SN74AHCT16540DGGR, each 8-bit section uses a 2-input AND gate with active-low inputs: outputs go high-impedance if *either* OE1 or OE2 is high. Both must be low for outputs to be enabled. This OR-of-active-lows logic simplifies bus arbitration - e.g., one OE can be system-wide disable, the other local peripheral select. The function table explicitly confirms "H X → Z" and "X H → Z", confirming the behavior is implemented in silicon, not external logic.
Is SN74AHCT16540DGGR pin-compatible with SN74AHCT16541DGGR?
No - the SN74AHCT16540DGGR is a noninverting buffer, while SN74AHCT16541DGGR is its inverting counterpart. Though both share identical pinout, package (DGG-48), and electrical specs, their logic functions differ fundamentally: SN74AHCT16541DGGR inverts input-to-output polarity. Substituting one for the other without logic inversion elsewhere in the design will cause functional failure. Always verify signal polarity requirements before interchange.
SN74AHCT16540DGGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 48-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 8
- 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-TSSOP
SN74AHCT16540DGGR FAQ
1.How can I place an order for SN74AHCT16540DGGR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT16540DGGR 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 SN74AHCT16540DGGR reliable?
The price and inventory of SN74AHCT16540DGGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT16540DGGR is usually 5 days.
3.What payment methods are accepted for SN74AHCT16540DGGR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT16540DGGR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHCT16540DGGR?
SN74AHCT16540DGGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT16540DGGR 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 SN74AHCT16540DGGR?
For technical support, including SN74AHCT16540DGGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT16540DGGR requirements.
6.How does Aetrix verify that SN74AHCT16540DGGR is sourced from the original manufacturer or authorized distributors?
All SN74AHCT16540DGGR 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 SN74AHCT16540DGGR meets industry standards.
7.What is the process for return or replacement of SN74AHCT16540DGGR?
All SN74AHCT16540DGGR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT16540DGGR, 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 SN74AHCT16540DGGR part is unused and in its original packaging.
Return procedure for SN74AHCT16540DGGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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