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Texas Instruments 74ACT16827DLR
- Part No.:
- 74ACT16827DLR
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
74ACT16827DLR.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,018
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Product details
Overview
74ACT16827DLR from Texas Instruments is a 20-bit noninverting buffer/driver IC with dual 10-bit sections, 3-state outputs, TTL-compatible inputs, and ±24 mA drive capability at 5 V. It features flow-through pinout architecture, distributed VCC/GND for noise reduction, and operates from –40°C to 85°C. Used in high-density bus interfacing applications such as backplane data routing and memory address buffering.
For engineers reviewing the 74ACT16827DLR datasheet, 74ACT16827DLR pinout, 74ACT16827DLR application, or 74ACT16827DLR equivalent, key selection considerations include output-enable logic (dual OE per 10-bit section), 56-pin SSOP package constraints, propagation delay (≤11 ns), 3.8 V min VOH at 24 mA, and compatibility with 5-V TTL and CMOS systems.
Technical Context
The 74ACT16827DLR implements two independent 10-bit noninverting buffer sections, each requiring both OE inputs (e.g., 1OE1 and 1OE2) low to enable outputs - enabling fine-grained bus control. Its EPIC™ 1-µm CMOS process delivers 500-mA latch-up immunity and supports 5-V operation only.
Input transition rate is specified up to 10 ns/V; outputs drive 50-pF loads with tPLH/tPHL ≤ 11 ns and tPZL/tPHZ ≤ 14 ns at VCC = 5 V. Power dissipation capacitance is 41 pF when enabled and 10 pF when disabled, supporting low dynamic power in burst-mode bus systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 20-bit noninverting buffer with dual 3-state control per 10-bit section |
| Supply Voltage | 4.5 V to 5.5 V - requires stable 5-V rail; not 3.3-V compatible |
| Output Drive | ±24 mA at VCC = 5 V - sufficient to drive standard 50-Ω transmission lines or multiple TTL loads |
| Propagation Delay | tPLH/tPHL ≤ 11 ns - enables reliable operation in 25-MHz+ synchronous bus systems |
| Input Compatibility | TTL-voltage compatible (VIL ≤ 0.8 V, VVIH ≥ 2 V) - interfaces directly with legacy 5-V TTL logic without level shifters |
| Power Dissipation | 1.4 W max at TA = 55°C - requires thermal consideration in dense PCB layouts |
| Operating Temperature | –40°C to +85°C - suitable for commercial and industrial ambient environments |
Pinout & Package
74ACT16827DLR is housed in a 56-pin Shrink Small-Outline Package (SSOP), DL variant, with 0.630-inch body width, 0.025-inch pitch, and RoHS-compliant CU-NiPdAu finish. JEDEC MO-118 compliant, moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE1, 1OE2, 2OE1, 2OE2 | Section output-enable inputs | All four must be low to activate respective 10-bit Y outputs; any high forces high-impedance state |
| 1A1–1A10, 2A1–2A10 | Buffer input terminals | Noninverting inputs for each of the two 10-bit sections |
| 1Y1–1Y10, 2Y1–2Y10 | Buffer output terminals | 3-state outputs with ±24 mA drive; flow-through layout minimizes trace crossovers |
| VCC (Pins 7, 22, 36, 50) | Power supply | Distributed VCC pins reduce simultaneous switching noise across 20-bit bus |
| GND (Pins 4, 11, 17, 29, 33, 46, 53) | Ground reference | Seven GND pins provide low-inductance return paths for high-speed switching currents |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Input and output pins arranged on opposite sides of package to eliminate layer jumps and reduce signal skew in PCB routing |
| Distributed VCC/GND | Four VCC and seven GND pins minimize ground bounce and supply droop during 20-bit parallel switching |
| EPIC™ process technology | 1-µm CMOS fabrication ensures 500-mA latch-up immunity at 125°C - critical for robustness in noisy industrial environments |
| TTL-input compatibility | Accepts standard TTL logic thresholds (0.8 V/2.0 V) without external biasing - simplifies integration with legacy 5-V systems |
| High noise immunity | Input clamp current ±20 mA and output clamp current ±50 mA protect against transient overvoltage events on bus lines |
Applications
| Backplane Data Routing | Memory Address Buffering |
|---|---|
Use Scenario: Isolating and driving wide parallel data buses between CPU and peripheral modules in modular instrumentation racks. IC Role / Device Role / Timing Role: 20-bit unidirectional buffer providing bus isolation and fanout amplification while maintaining signal integrity across 15-cm backplane traces. Use Value: Flow-through pinout and distributed power pins reduce inter-symbol interference and timing skew, enabling reliable 25-MHz bus operation without termination resistors. |
Use Scenario: Driving 20-bit address lines from microcontroller to multiple SRAM or Flash devices sharing a common address bus. IC Role / Device Role / Timing Role: Noninverting buffer with dual OE control allows selective activation of memory banks without address contention. Use Value: Dual OE per 10-bit section enables independent gating of upper/lower address nibbles - reducing address setup time by eliminating shared enable delays. |
| Industrial PLC I/O Expansion | Digital Test Equipment Bus Interface |
Use Scenario: Interfacing FPGA-based controller logic to 20-bit parallel I/O modules in programmable logic controllers with hot-swap capability. IC Role / Device Role / Timing Role: 3-state buffer isolates FPGA I/O during module insertion/removal and provides bus contention protection. Use Value: High latch-up immunity (500 mA at 125°C) and wide operating temperature range ensure reliability in uncooled control cabinets. |
Use Scenario: Connecting pattern generator outputs to device-under-test (DUT) pins in automated test equipment requiring precise timing and low skew. IC Role / Device Role / Timing Role: Low-propagation-delay buffer (≤11 ns) synchronizes 20-bit stimulus vectors with sub-nanosecond edge alignment. Use Value: Matched tPLH/tPHL and tPZL/tPHZ specs ensure <100-ps channel-to-channel skew across all 20 bits - critical for timing margin validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 20-bit 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT16244DGGR | 16-bit (not 20-bit); four independent 4-bit sections; same 56-pin SSOP-DL package | Lacks two bits per section; requires two devices for full 20-bit coverage | Select if system design permits splitting 20-bit bus into 16+4 or uses partial bus width |
| 74ACT16373DLR | 20-bit transparent latch (not buffer); includes clocked D-type latching; identical pinout and package | Provides edge-triggered data capture instead of transparent pass-through; adds storage functionality | Choose when bus data must be held stable during address/data multiplexing or asynchronous handshaking |
Compared with SN74ACT16244DGGR and 74ACT16373DLR, the 74ACT16827DLR uniquely delivers 20-bit transparent buffering with dual-OE per section in a single 56-pin SSOP, avoiding board space penalty of multi-device solutions and eliminating latch timing constraints of registered alternatives.
Availability
74ACT16827DLR is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy 5-V computing systems requiring stable component supply, long-term obsolescence management, and RoHS-compliant packaging.
Supply support for 74ACT16827DLR 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The 74ACT16827DLR belongs to TI's Widebus™ family of high-speed CMOS logic devices, designed specifically for wide parallel bus interfacing in 5-V systems where signal integrity, density, and noise immunity are critical.
FAQ
What is the operating voltage range for the 74ACT16827DLR?
The 74ACT16827DLR operates within a supply voltage range of 4.5 V to 5.5 V. It is not rated for 3.3-V operation, and applying voltages outside this range may cause permanent damage. The recommended nominal supply is 5 V, with electrical characteristics fully characterized at 4.5 V and 5.5 V per TI's SCAS163A datasheet.
How does the output-enable logic work on the 74ACT16827DLR?
The 74ACT16827DLR has two independent 10-bit sections, each controlled by two output-enable inputs: Section 1 uses 1OE1 and 1OE2, Section 2 uses 2OE1 and 2OE2. Both OE signals per section must be low for that section's outputs to be active; if either is high, all ten Y outputs enter high-impedance state. This dual-OE structure prevents partial enable glitches.
Is the 74ACT16827DLR pin-compatible with other Widebus™ devices in the DL package?
No - the 74ACT16827DLR has a unique 56-pin DL pinout optimized for flow-through architecture. While it shares the DL package footprint with other TI Widebus™ parts like 74ACT16373DLR, pin assignments differ significantly (e.g., clock vs. OE placement, input/output grouping). Direct substitution without PCB revision is not supported.
What is the maximum capacitive load the 74ACT16827DLR can drive reliably?
The 74ACT16827DLR is characterized for driving 50-pF loads with guaranteed timing (tPLH, tPHL ≤ 11 ns at VCC = 5 V). While it can drive higher capacitance, performance degrades: rise/fall times increase linearly with load, and VOH/VOL margins shrink beyond 70 pF. For >50-pF traces or stubs, series termination or reduced edge rates are recommended.
Does the 74ACT16827DLR support hot-swap or live-insertion?
The 74ACT16827DLR is not explicitly qualified for hot-swap, but its ±20 mA input clamp current, ±50 mA output clamp current, and 500-mA latch-up immunity provide inherent robustness during power-rail sequencing transients. For true hot-swap compliance, external protection circuitry (e.g., series resistors, TVS diodes) is required per system-level requirements.
74ACT16827DLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 10
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-SSOP
74ACT16827DLR FAQ
1.How can I place an order for 74ACT16827DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT16827DLR 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 74ACT16827DLR reliable?
The price and inventory of 74ACT16827DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT16827DLR is usually 5 days.
3.What payment methods are accepted for 74ACT16827DLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT16827DLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT16827DLR?
74ACT16827DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT16827DLR 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 74ACT16827DLR?
For technical support, including 74ACT16827DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT16827DLR requirements.
6.How does Aetrix verify that 74ACT16827DLR is sourced from the original manufacturer or authorized distributors?
All 74ACT16827DLR 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 74ACT16827DLR meets industry standards.
7.What is the process for return or replacement of 74ACT16827DLR?
All 74ACT16827DLR units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT16827DLR, 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 74ACT16827DLR part is unused and in its original packaging.
Return procedure for 74ACT16827DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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