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Texas Instruments 74AC16640DL
- Part No.:
- 74AC16640DL
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
74AC16640DL.pdf
- Description:
- BUS TRANSCEIVER
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Product details
Overview
74AC16640DL from Texas Instruments is a 16-bit inverting bus transceiver in DL (shrink small-outline) package, supporting bidirectional asynchronous data transfer between A and B buses with independent direction control (1DIR/2DIR) and output-enable (1OE/2OE) inputs. It operates from −40°C to 85°C at VCC = 3–5.5 V, delivers ±24 mA output drive, and achieves tPLH/tPHL ≤ 7.3 ns at 5 V. Used in backplane interconnects and modular system board-to-board communication.
For engineers reviewing the 74AC16640DL datasheet, 74AC16640DL pinout, 74AC16640DL application, or 74AC16640DL equivalent, key selection criteria include dual 8-bit or unified 16-bit configuration flexibility, flow-through pinout for PCB layout optimization, distributed VCC/GND for noise suppression, and EPIC™ CMOS process enabling 500-mA latch-up immunity at 125°C.
Technical Context
The 74AC16640DL implements two independent 8-bit transceiver sections, each with separate DIR and OE controls, allowing simultaneous or staggered bus direction switching. Its flow-through architecture places A-side and B-side I/O pins on opposite sides of the package to minimize trace crossovers and reduce signal skew.
It uses TI's EPIC™ (Enhanced-Performance Implanted CMOS) 1-µm process, delivering rail-to-rail output swing, high noise immunity (VIH = 3.15 V min at VCC = 4.5 V), and low input/output capacitance (Ci = 4.5 pF, Cio = 16 pF). The device supports hot-insertion tolerant operation via controlled output disable timing (tPZL ≤ 15.5 ns, tPHZ ≤ 11.2 ns at 5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 3 V to 5.5 V - supports mixed-voltage system interfacing and legacy 5-V logic compatibility |
| Output Drive | ±24 mA at VCC = 4.5 V - sufficient to drive 50-pF loads across 10-cm PCB traces without buffering |
| Propagation Delay | tPLH/tPHL ≤ 7.3 ns at VCC = 5 V - enables reliable operation in 100-MHz bus systems with setup/hold margin |
| Input Thresholds | VIH = 3.15 V, VIL = 1.35 V at VCC = 4.5 V - ensures TTL-compatible recognition and noise margin > 0.8 V |
| Power Dissipation | Cpd = 55 pF per transceiver (enabled), 8 pF (disabled) - enables accurate dynamic power estimation at 1 MHz toggle rate |
| Latch-Up Immunity | 500 mA typical at 125°C - meets JEDEC JESD78 Class II requirements for robustness in industrial environments |
| Operating Temperature | −40°C to +85°C - qualified for commercial and extended-temperature industrial control applications |
Pinout & Package
74AC16640DL is housed in a 48-pin plastic shrink small-outline (DL) package with 300-mil body width and 25-mil center-to-center pin spacing. The package provides twice the I/O density of standard SOIC while maintaining compatible footprint area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input (active-high) | Selects data flow direction per section: DIR = L → B→A; DIR = H → A→B |
| 1OE, 2OE | Output-enable input (active-low) | OE = H disables outputs to high-impedance state, isolating both buses |
| 1A1–1A8, 2A1–2A8 | Section 1 & 2 A-side bidirectional I/O | Connect to local bus; driven by B-side when DIR active, tri-stated when OE high |
| 1B1–1B8, 2B1–2B8 | Section 1 & 2 B-side bidirectional I/O | Connect to remote bus; driven by A-side when DIR active, tri-stated when OE high |
| VCC (pins 7, 18, 31, 42) | Power supply | Distributed VCC pins reduce simultaneous switching noise and improve PDN impedance |
| GND (pins 4, 10, 21, 34, 45) | Ground reference | Multiple GND pins provide low-inductance return paths for high-speed switching currents |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Eliminates layer jumps and vias in PCB routing - reduces signal path length mismatch by up to 40% vs. folded layouts |
| Dual independent control | Separate 1DIR/1OE and 2DIR/2OE enable asymmetric bus arbitration - e.g., A→B on Section 1 while B→A on Section 2 |
| Inverting logic function | Outputs invert data during transfer - supports differential signaling interfaces and complements-based protocol handshaking |
| EPIC™ CMOS process | Enables 1-µm feature size with 500-mA latch-up immunity - suitable for harsh industrial environments without external protection |
| Hot-insertion support | Controlled output disable timing (tPZL/tPHZ < 16 ns) prevents bus contention during live module insertion |
Applications
| Modular Backplane Interconnect | Industrial PLC I/O Expansion |
|---|---|
|
Use Scenario: Connecting CPU module to interchangeable I/O carrier cards via parallel backplane bus. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing data flow between master and slave modules under software-directed direction control. Use Value: Flow-through pinout simplifies 48-pin backplane connector routing; ±24 mA drive sustains signal integrity over 15-cm edge-card traces at 25 MHz. |
Use Scenario: Isolating field I/O bus from controller bus in programmable logic controller rack systems. IC Role / Device Role / Timing Role: Bus isolation device activated only during data exchange cycles, minimizing cross-talk between noisy digital I/O and sensitive control logic. Use Value: Independent OE control per section allows selective isolation of analog input or discrete output banks without halting entire system operation. |
| Test Equipment Digital Subsystem | Legacy System Bus Bridge |
|
Use Scenario: Interfacing FPGA-based pattern generator to DUT's parallel test bus with configurable data direction. IC Role / Device Role / Timing Role: High-speed transceiver synchronizing test vector delivery and response capture using shared bus architecture. Use Value: 7.3 ns max propagation delay at 5 V enables precise timing alignment within 10-ns test windows; low Cio (16 pF) minimizes capacitive loading on FPGA I/O. |
Use Scenario: Bridging ISA bus signals to modern microcontroller peripheral interface in retro-computing hardware upgrades. IC Role / Device Role / Timing Role: Logic-level translator and bus driver enabling 16-bit data transfers between legacy 8/16-bit peripherals and new host controllers. Use Value: Inverting function matches ISA bus polarity conventions; wide VCC range (3–5.5 V) accommodates both 3.3-V MCU and 5-V peripheral voltage domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit inverting transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ACT16640DL | ACT version: TTL-compatible inputs (VIH = 2 V min), slightly higher ICC (100 µA max), identical pinout and AC specs | Better suited for mixed TTL/CMOS systems where input thresholds must meet legacy TTL levels | Select when interfacing with 74LS or older microcontrollers requiring 2-V VIH; otherwise 74AC16640DL offers lower power and improved noise margin |
| SN74LVC16640ADGGR | 3.3-V only (1.65–3.6 V), smaller VQFN package, non-inverting logic, 32 mA drive, 3.3 ns tPD | Targeted for low-voltage portable/embedded designs; lacks 5-V tolerance and inverting function | Choose for space-constrained 3.3-V systems needing faster speed and lower voltage; not drop-in due to voltage, logic, and package incompatibility |
Compared with 74ACT16640DL and SN74LVC16640ADGGR, the 74AC16640DL uniquely balances 5-V compatibility, inverting functionality, industrial temperature range, and proven flow-through layout advantage - making it optimal for legacy-compatible, noise-sensitive, and modular backplane designs.
Availability
74AC16640DL is available at Aetrix Electronics and suitable for modular backplane interconnects, industrial PLC I/O expansion, test equipment digital subsystems, and legacy system bus bridge applications requiring stable component supply across long production lifecycles.
Supply support for 74AC16640DL 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 industrial and automotive-grade components.
The 74AC16640DL belongs to TI's Widebus™ family of high-speed CMOS transceivers, designed specifically for noise-resilient, high-density PCB interconnects in modular industrial and test equipment systems.
FAQ
What is the operating temperature range for the 74AC16640DL?
The 74AC16640DL is characterized for operation from −40°C to +85°C, meeting extended commercial and industrial temperature requirements. This range ensures reliable performance in factory automation controllers, outdoor test equipment, and other environments where ambient temperatures exceed standard commercial limits. The 74AC16640DL maintains full AC and DC specifications across this range without derating.
Does the 74AC16640DL support hot-swap or hot-insertion?
Yes, the 74AC16640DL supports controlled hot-insertion through its fast, well-characterized output disable timing: tPZL ≤ 15.5 ns and tPHZ ≤ 11.2 ns at VCC = 5 V. When OE is asserted, outputs transition cleanly to high-impedance without bus contention. Combined with distributed VCC/GND pins and 500-mA latch-up immunity, the 74AC16640DL is suitable for live module replacement in modular backplane systems.
Is the 74AC16640DL pin-compatible with the 74ACT16640DL?
Yes, the 74AC16640DL and 74ACT16640DL share identical DL package, pinout, and functional block diagram. Both devices use the same 48-pin shrink small-outline footprint and match on all control, I/O, and power terminal assignments. However, they differ electrically: the ACT version has TTL-compatible input thresholds (VIH = 2 V min), while the AC version requires VIH = 3.15 V min at VCC = 4.5 V - a critical distinction for system-level logic compatibility.
What does "inverting" mean for the 74AC16640DL's data path?
The 74AC16640DL performs bitwise logical inversion on all data transferred between A and B buses: a logic HIGH on A appears as LOW on B, and vice versa. This is inherent to the device's internal gate structure and applies regardless of direction (A→B or B→A). The inversion is deterministic and fully specified in the datasheet's DC characteristics - it is not optional or configurable, and must be accounted for in protocol layer design.
Can the 74AC16640DL be used with 3.3-V systems?
Yes, the 74AC16640DL operates down to VCC = 3 V and is fully specified at 3.3 V ± 0.3 V, with guaranteed tPLH/tPHL ≤ 10 ns and VOH ≥ 2.48 V. Its inputs are 5-V tolerant (VI up to VCC + 0.5 V), enabling safe interfacing with 5-V peripherals even when powered from 3.3 V. However, output swing will be limited to 0–3.3 V, so receiver thresholds on the connected bus must accommodate this range.
74AC16640DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
74AC16640DL FAQ
1.How can I place an order for 74AC16640DL through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC16640DL 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 74AC16640DL reliable?
The price and inventory of 74AC16640DL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC16640DL is usually 5 days.
3.What payment methods are accepted for 74AC16640DL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC16640DL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC16640DL?
74AC16640DL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC16640DL 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 74AC16640DL?
For technical support, including 74AC16640DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC16640DL requirements.
6.How does Aetrix verify that 74AC16640DL is sourced from the original manufacturer or authorized distributors?
All 74AC16640DL 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 74AC16640DL meets industry standards.
7.What is the process for return or replacement of 74AC16640DL?
All 74AC16640DL units undergo pre-shipment inspection (PSI). If there is an issue with 74AC16640DL, 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 74AC16640DL part is unused and in its original packaging.
Return procedure for 74AC16640DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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