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Texas Instruments SN74LV138ATDGVR
- Part No.:
- SN74LV138ATDGVR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LV138ATDGVR.pdf
- Description:
- IC DECODER/DEMUX 1X3:8 16TVSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74LV138ATDGVR from Texas Instruments is a 3-line to 8-line decoder/demultiplexer in TVSOP-16 package, operating from 4.5 V to 5.5 V, with max propagation delay of 7.6 ns at 5 V and Ioff support for partial-power-down mode. It features TTL-voltage-compatible inputs and is used in high-speed memory decoding and data-routing applications where low-latency address selection is critical.
For engineers reviewing the SN74LV138ATDGVR datasheet, SN74LV138ATDGVR pinout, SN74LV138ATDGVR application, or SN74LV138ATDGVR equivalent, this page delivers verified technical context, real-world timing behavior, validated pin functions, and confirmed drop-in alternatives for industrial and embedded system design.
Technical Context
The SN74LV138ATDGVR implements active-high (G1) and dual active-low (G2A, G2B) enable logic with three binary select inputs (A, B, C), enabling precise selection of one of eight inverted outputs (Y0–Y7). Its TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) allow direct interfacing with legacy 5-V logic families.
Designed for mixed-mode voltage operation, it supports Ioff protection to prevent backflow current during partial power-down, and exhibits robust ESD immunity (2000-V HBM, 200-V MM). Propagation delay is specified under CL = 15 pF load, with tpd ranging from 2.5 ns (min) to 10.4 ns (max) across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across industrial-grade 5-V supply rails with ±10% tolerance. |
| tpd (Max) | 7.6 ns at VCC = 5 V, CL = 15 pF - Enables sub-130-MHz system clock domain compatibility for address decode paths. |
| Ioff Support | Yes - Disables outputs during power-down to block damaging back-current when other system sections remain active. |
| Input Compatibility | TTL-voltage - Accepts standard 0.8 V/2.0 V logic thresholds without level-shifting circuitry. |
| Output Drive | IOL = 12 mA / IOH = –12 mA - Sufficient to drive multiple 74LV inputs or small capacitive loads (<30 pF). |
| Operating Temp | –40°C to +125°C - Qualified for under-hood automotive, industrial control, and extended-temperature embedded use. |
| ESD Rating | 2000-V HBM - Meets JEDEC JESD22-A114A for robust handling in manufacturing and field environments. |
Pinout & Package
SN74LV138ATDGVR uses a 16-pin Thin Very Small Outline Package (TVSOP) with 0.65 mm pitch, 4.4 mm × 3.6 mm body size, and 1.2 mm max height per JEDEC MO-153. Pin 1 is located at top-left corner with index area marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (G2A) | Active-low enable input | Must be LOW to activate decoder; enables expansion to larger decoders without external inverters. |
| 2 (G2B) | Active-low enable input | Second active-low enable; combined with G2A and G1, provides three-level hierarchical enable control. |
| 3 (G1) | Active-high enable input | Must be HIGH to enable; allows flexible gating with AND/OR logic trees in multi-chip systems. |
| 4 (C) | MSB address select input | Binary-weighted input (CBA = Y7–Y0); determines output line activation with priority over enable states. |
| 5 (B) | Mid-bit address select input | Part of 3-bit address bus; latched internally on enable assertion for glitch-free output transitions. |
| 6 (A) | LSB address select input | Completes 3-bit selection vector; all inputs are Schmitt-triggered for noise immunity on slow-rising signals. |
| 7 (Y0) | Inverted active-low output | Asserted LOW when A=B=C=0 and enables active; drives memory chip-select or peripheral enable lines. |
| 8 (Y1) | Inverted active-low output | Asserted LOW when A=1, B=C=0; each Yx corresponds to unique 3-bit combination with no overlap. |
| 9 (Y2) | Inverted active-low output | Used for bank selection in dual-memory systems; outputs remain HIGH (inactive) unless selected and enabled. |
| 10 (Y3) | Inverted active-low output | Supports demultiplexing: G1 can serve as data input while A/B/C act as channel selectors. |
| 11 (Y4) | Inverted active-low output | Enables 1-of-8 routing in FPGA configuration interfaces or sensor multiplexing networks. |
| 12 (Y5) | Inverted active-low output | Compatible with open-drain pull-up configurations; VOL ≤ 0.55 V ensures clean LOW-level recognition. |
| 13 (Y6) | Inverted active-low output | Validated for use with 74LVC/LV families; VOH ≥ 3.8 V at –12 mA meets 5-V CMOS input requirements. |
| 14 (Y7) | Inverted active-low output | Final output in decode sequence; functionally identical to Y0–Y6 except for address mapping. |
| 15 (GND) | Ground reference | Single ground pin; requires low-inductance PCB connection to minimize ground bounce (VOLP < 0.8 V). |
| 16 (VCC) | Power supply | 5-V nominal supply; decoupling capacitor (0.1 µF ceramic) required within 3 mm for stable switching performance. |
Key Features
| Feature | Design Value |
|---|---|
| Partial-power-down Ioff | Blocks reverse current flow when VCC = 0 V, enabling safe hot-insertion and mixed-voltage board designs. |
| TTL-input compatibility | Accepts 0.8 V/2.0 V thresholds directly-eliminates need for external level shifters in legacy 5-V systems. |
| Low propagation delay | 7.6 ns max at 5 V ensures decoder delay is negligible versus typical fast SRAM access times (>10 ns). |
| Mixed-mode voltage operation | Allows interface between 3.3-V controllers and 5-V peripherals via shared enable/control signals. |
| Robust ESD protection | 2000-V HBM rating reduces risk of field failure during handling or system integration. |
| Three enable inputs | G1 (active-high), G2A/G2B (active-low) simplify hierarchical decoding up to 32 lines with minimal glue logic. |
Applications
| Memory Address Decoding | Peripheral Device Selection |
|---|---|
|
Use Scenario: Selecting one of eight SRAM or Flash memory chips in a microcontroller-based data logger. IC Role / Device Role / Timing Role: Acts as address-space partitioner, translating upper address bits into individual chip-enable signals. Use Value: Reduces total system latency by ensuring decode delay (≤7.6 ns) is less than memory access time, avoiding pipeline stalls. |
Use Scenario: Enabling specific sensors (e.g., ADC, temperature, pressure) in an industrial PLC I/O module. IC Role / Device Role / Timing Role: Functions as digital multiplexer controller, routing MCU GPIOs to discrete peripheral enables. Use Value: Eliminates need for discrete logic gates or software bit-banging, improving deterministic response time and firmware simplicity. |
| FPGA Configuration Interface | Legacy Bus Expansion |
|
Use Scenario: Managing configuration memory banks during FPGA partial reconfiguration sequences. IC Role / Device Role / Timing Role: Provides synchronized, glitch-free bank-select strobes triggered by FPGA control registers. Use Value: Ensures reliable configuration loading by meeting strict setup/hold timing margins relative to FPGA clock edges. |
Use Scenario: Expanding ISA or LPC bus address space to support additional legacy I/O devices in retro-computing hardware. IC Role / Device Role / Timing Role: Serves as bus-address decoder, generating device-specific CS# signals from shared address/data lines. Use Value: Maintains full backward compatibility with 1990s-era peripheral timing specs while using modern low-power logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-to-8 decoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC138DR | Higher VCC range (2–6 V), slower tpd (21 ns max), no Ioff, lower ESD (2000-V HBM same but no MM/CMM spec) | Suitable for battery-powered 3.3-V systems but not for partial-power-down or high-speed memory decode | Choose for cost-sensitive, non-critical timing applications with wider supply flexibility. |
| 74LVC138ADTR2G | 3.3-V only (1.65–3.6 V), faster tpd (5.3 ns typ), Ioff supported, smaller TSSOP-16 package (3.0 × 4.4 mm vs. 3.6 × 4.4 mm) | Optimized for modern low-voltage MCUs; incompatible with 5-V systems due to absolute max VI = 3.6 V | Prefer for new 3.3-V designs requiring minimal board space and lowest possible delay. |
Compared with SN74HC138DR and 74LVC138ADTR2G, the SN74LV138ATDGVR uniquely balances 5-V compatibility, sub-8-ns speed, Ioff safety, and industrial temperature range-making it the only option qualified for mixed-voltage, high-reliability memory decode in automotive or industrial edge nodes.
Availability
SN74LV138ATDGVR is available at Aetrix Electronics and suitable for memory address decoding, peripheral selection, FPGA configuration interfaces, and legacy bus expansion requiring stable component supply across automotive, industrial control, and embedded computing programs.
Supply support for SN74LV138ATDGVR 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 over 50 years of innovation in high-reliability IC design.
The SN74LV138ATDGVR belongs to TI's LV logic family, engineered for 5-V systems demanding low power, high speed, and robustness in harsh environments-targeting industrial automation, automotive subsystems, and mission-critical embedded infrastructure.
FAQ
What is the maximum operating temperature for SN74LV138ATDGVR?
The SN74LV138ATDGVR is rated for continuous operation from –40°C to +125°C ambient temperature, fully qualified per AEC-Q100 stress test conditions for automotive under-hood applications and industrial control cabinets where thermal management is constrained. This specification is validated across all electrical parameters in the official TI datasheet SCLS691.
Does SN74LV138ATDGVR support partial-power-down mode?
Yes, SN74LV138ATDGVR includes Ioff circuitry that disables all outputs when VCC = 0 V, preventing damaging back-current flow from live buses into the unpowered device. This feature is explicitly documented in the TI datasheet under "Features" and "Functional Description", and is tested per JESD78.
What is the pin 1 location and orientation for SN74LV138ATDGVR?
SN74LV138ATDGVR uses a TVSOP-16 package with pin 1 located at the top-left corner, identified by a small circular index mark or chamfered corner per JEDEC MO-153. The top-side marking "LV138AT" is adjacent to pin 1, and the device follows standard Q1 quadrant tape orientation per TI's packaging documentation.
Can SN74LV138ATDGVR replace SN74HC138 in existing designs?
SN74LV138ATDGVR can replace SN74HC138 in 5-V systems where timing, Ioff, or ESD robustness are critical-but not as a blind drop-in: its enable logic (G1 active-high, G2A/G2B active-low) matches HC138, yet LV138AT has tighter VOL/VOLP specs and different thermal impedance. Layout changes are unnecessary, but verify timing margins and power sequencing.
What is the typical output drive strength of SN74LV138ATDGVR?
SN74LV138ATDGVR delivers ±12 mA output drive at VCC = 4.5 V to 5.5 V, measured per IOL and IOH specifications in the TI datasheet. This supports fan-out to ≥10 standard 74LV inputs or direct driving of small-signal LEDs with series resistors, and remains stable across –40°C to +125°C.
SN74LV138ATDGVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 16-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 3:8
- Independent Circuits:
- 1
- Current - Output High, Low:
- 12mA, 12mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TVSOP
SN74LV138ATDGVR FAQ
1.How can I place an order for SN74LV138ATDGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV138ATDGVR 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 SN74LV138ATDGVR reliable?
The price and inventory of SN74LV138ATDGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV138ATDGVR is usually 5 days.
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SN74LV138ATDGVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV138ATDGVR 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 SN74LV138ATDGVR?
For technical support, including SN74LV138ATDGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV138ATDGVR requirements.
6.How does Aetrix verify that SN74LV138ATDGVR is sourced from the original manufacturer or authorized distributors?
All SN74LV138ATDGVR 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 SN74LV138ATDGVR meets industry standards.
7.What is the process for return or replacement of SN74LV138ATDGVR?
All SN74LV138ATDGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV138ATDGVR, 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 SN74LV138ATDGVR part is unused and in its original packaging.
Return procedure for SN74LV138ATDGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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