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Texas Instruments SN74ABT162825DL
- Part No.:
- SN74ABT162825DL
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT162825DL.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,970
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Product details
Overview
SN74ABT162825DL from Texas Instruments is an 18-bit 3-state buffer/line driver in the Widebus™ family, designed for memory address, clock, and bus-oriented applications. It features dual 9-bit channels with independent active-low 2-input AND-gated OE controls, 25-Ω integrated series output resistors, ±12 mA drive capability, and Ioff/power-up 3-state support for hot insertion. It operates at 4.5–5.5 V over −40°C to 85°C in a 56-pin SSOP package.
For engineers reviewing the SN74ABT162825DL datasheet, SN74ABT162825DL pinout, SN74ABT162825DL application, or SN74ABT162825DL equivalent, this page delivers verified electrical specs, true pin mapping, hot-insertion design guidance, and validated alternative options for high-density bus interface systems.
Technical Context
The SN74ABT162825DL implements two independent 9-bit noninverting buffers, each with a 2-input AND gate (OE1/OE2) enabling high-impedance state when either control is high. Its flow-through pinout minimizes trace skew and simplifies PCB layout for parallel bus routing.
It integrates 25-Ω series resistors per output to suppress overshoot/undershoot without external components, supports Ioff (≤±100 µA at VCC = 0) to prevent backflow during hot insertion, and ensures power-up/power-down 3-state behavior via internal circuitry - eliminating bus contention during supply ramping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V TTL and mixed-voltage system interfaces |
| Output Drive | ±12 mA - sufficient to drive 50-pF loads at ≤4.7 ns propagation delay (tPHL/tPLH) |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - TTL-compatible logic levels ensure interoperability with legacy 5-V systems |
| Output Resistance | 25 Ω (integrated series) - eliminates need for external termination resistors on PCB traces |
| Hot-Insertion Support | Ioff ≤ ±100 µA at VCC = 0 - blocks damaging current flow when device is unpowered but bus remains live |
| Propagation Delay | tPLH/tPHL = 1–4.1 ns @ VCC = 5 V, CL = 50 pF - enables >200 MHz bus operation in short-trace configurations |
| Power-Up Behavior | Guaranteed high-impedance outputs during VCC ramp (200 µs/V min) - prevents bus conflicts at power-on |
Pinout & Package
SN74ABT162825DL uses a 56-pin Plastic Small-Outline Package (SSOP), DL variant, with 0.5-mm lead pitch, 7.5-mm body width, and JEDEC MO-118 compliance. The flow-through architecture places inputs on one side and outputs on the opposite side to minimize layer transitions and crosstalk.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE1, 1OE2, 2OE1, 2OE2 | Active-low 2-input OE controls | AND-gated enable: outputs go high-Z if either input is high - supports flexible bus arbitration |
| 1A1–1A9, 2A1–2A9 | Data inputs (two 9-bit groups) | Noninverting inputs driving corresponding Y outputs - no polarity inversion in signal path |
| 1Y1–1Y9, 2Y1–2Y9 | Buffered outputs (two 9-bit groups) | 25-Ω series-resistor outputs reduce EMI and eliminate external termination |
| VCC (pins 7, 25, 40, 52) | Power supply | Distributed VCC pins minimize simultaneous switching noise across 18 outputs |
| GND (pins 4, 11, 14, 15, 22, 33, 36, 37, 44, 47, 55) | Ground reference | 11 dedicated GND pins provide low-inductance return paths for high-speed switching |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25-Ω output series resistors | Eliminates need for 18 discrete SMT resistors, reducing BOM count and PCB area by ~30 mm² |
| Flow-through pinout architecture | Enables straight-layer PCB routing with minimal vias - cuts trace length mismatch to <5 mm between channels |
| Ioff protection (≤±100 µA) | Allows safe insertion into live 5-V backplanes without risk of latch-up or bus disruption |
| Power-up 3-state circuitry | Ensures outputs remain high-Z until VCC reaches ≥2.1 V - critical for sequenced power systems |
| Distributed VCC/GND pin placement | Reduces ground bounce (VOLP <1 V) and supply droop during full 18-bit switching events |
Applications
| Memory Address Buffering | Clock Distribution Network |
|---|---|
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or Flash devices on a shared bus. IC Role / Device Role / Timing Role: Noninverting 18-bit buffer isolating controller outputs from capacitive bus loading while maintaining timing integrity. Use Value: Integrated 25-Ω resistors suppress ringing on 10-cm traces, enabling reliable 100-MHz address strobing without external termination. |
Use Scenario: Fan-out of a single system clock to multiple synchronous peripherals (e.g., ADCs, DACs, FPGAs). IC Role / Device Role / Timing Role: Low-skew, high-drive buffer ensuring matched edge rates and minimized inter-channel skew (<100 ps). Use Value: Flow-through pinout and distributed power pins reduce jitter accumulation, preserving <15 ps cycle-to-cycle jitter at 50 MHz. |
| Hot-Swappable Backplane Interface | Legacy Bus Transceiver Interface |
Use Scenario: Enabling field-replaceable modules in industrial PLC backplanes where cards are inserted under power. IC Role / Device Role / Timing Role: Hot-insertion–qualified buffer providing Ioff isolation and power-up 3-state to prevent bus contention. Use Value: Ioff ≤±100 µA and guaranteed high-Z on power ramp prevent data corruption or damage during card insertion/removal. |
Use Scenario: Interfacing modern microcontrollers to legacy ISA or PC/104 buses requiring 5-V tolerant, high-current drivers. IC Role / Device Role / Timing Role: TTL-compatible 18-bit transceiver replacing discrete 74-series parts with reduced component count. Use Value: 0.8 V/2.0 V input thresholds and ±12 mA drive meet original ISA timing specs while lowering board-level debug time by 40%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 18-bit 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT16244DL | 16-bit (not 18-bit); identical 25-Ω resistors, Ioff, and SSOP-48 package | Lacks two output bits; unsuitable for full 18-bit address buses but fits narrower data paths | Select only if system requires ≤16-bit width and board space constraints favor smaller footprint |
| SN74LVC16244ADGGR | 16-bit, 3.3-V only (1.65–3.6 V), no integrated series resistors, LVCMOS thresholds | Requires external termination; incompatible with 5-V buses unless level-shifted | Choose for low-power 3.3-V systems where voltage translation and external resistors are acceptable |
Compared with SN74ABT162825DL, SN74ABT16244DL offers pin-compatible 16-bit buffering in a smaller package but cannot replace 18-bit functionality, while SN74LVC16244ADGGR targets modern low-voltage designs but introduces layout complexity through external termination and level-shifting requirements.
Availability
SN74ABT162825DL is available at Aetrix Electronics and suitable for memory subsystems, clock distribution networks, hot-swappable backplanes, and legacy bus interface designs requiring stable component supply and long-term industrial availability.
Supply support for SN74ABT162825DL 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, performance, and broad application support.
The SN74ABT162825DL belongs to TI's Widebus™ family of high-speed 3-state buffers, engineered specifically for dense, noise-sensitive 5-V bus systems including memory addressing, clock fan-out, and industrial backplane interfaces.
FAQ
What is the operating temperature range for SN74ABT162825DL?
The SN74ABT162825DL is rated for operation from −40°C to +85°C ambient temperature. This commercial-grade specification aligns with standard industrial system requirements and is explicitly defined in the recommended operating conditions table of the SCBS474D datasheet. The device maintains full 3-state functionality, drive strength, and timing performance across this entire range.
Does SN74ABT162825DL support hot insertion, and how is it implemented?
Yes, SN74ABT162825DL supports hot insertion via two integrated features: Ioff circuitry limits current to ≤±100 µA when VCC = 0, preventing backflow from live bus lines; and power-up 3-state circuitry forces all outputs into high-impedance before VCC reaches 2.1 V. These functions are verified in the absolute maximum ratings and recommended operating conditions sections of the official TI datasheet.
What package type and pin count does SN74ABT162825DL use?
SN74ABT162825DL uses a 56-pin Plastic Small-Outline Package (SSOP) with designation DL, measuring 7.5 mm × 16.0 mm and featuring 0.5-mm lead pitch. This mechanical configuration is documented in TI's MSSO001C drawing and confirmed in the ordering information table of SCBS474D, where "DL" is listed as the package code for the tube-packaged SN74ABT162825DL.
How does the 2-input AND-gated OE structure work on SN74ABT162825DL?
Each 9-bit channel of SN74ABT162825DL has two active-low OE inputs (e.g., 1OE1 and 1OE2) wired to a 2-input AND gate. If either input is high, the corresponding nine outputs enter high-impedance state. Only when both OE inputs are low do outputs actively drive. This dual-control scheme allows flexible bus arbitration and is explicitly shown in the logic diagram and function table of the SCBS474D datasheet.
Are external termination resistors required when using SN74ABT162825DL?
No, external termination resistors are not required because SN74ABT162825DL integrates 25-Ω series resistors on every output. This feature is stated in the headline description of the SCBS474D datasheet ("Output Ports Have Equivalent 25-Ω Series Resistors, So No External Resistors Are Required") and confirmed in the electrical characteristics table under VOH/VOL test conditions involving drive current.
SN74ABT162825DL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 9
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 12mA, 12mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-SSOP
SN74ABT162825DL FAQ
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5.How can I obtain technical support or documentation for SN74ABT162825DL?
For technical support, including SN74ABT162825DL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT162825DL requirements.
6.How does Aetrix verify that SN74ABT162825DL is sourced from the original manufacturer or authorized distributors?
All SN74ABT162825DL 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 SN74ABT162825DL meets industry standards.
7.What is the process for return or replacement of SN74ABT162825DL?
All SN74ABT162825DL units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT162825DL, 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 SN74ABT162825DL part is unused and in its original packaging.
Return procedure for SN74ABT162825DL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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