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Texas Instruments 74AC11138PWR
- Part No.:
- 74AC11138PWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74AC11138PWR.pdf
- Description:
- IC DECODER/DEMUX 1X3:8 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:641
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Product details
Overview
74AC11138PWR from Texas Instruments is a 3-line to 8-line decoder/demultiplexer in a 16-pin TSSOP package, designed for high-speed memory decoding and data routing. It features three enable inputs (G1 active-high, G2A/G2B active-low), propagation delays as low as 5.1 ns at 5 V, operates from –40°C to 85°C, and supports VCC from 3 V to 5.5 V. It is used in memory address decoding for SRAM/DRAM subsystems where minimal system delay is critical.
For engineers reviewing the 74AC11138PWR datasheet, 74AC11138PWR pinout, 74AC11138PWR application, or 74AC11138PWR equivalent, key selection considerations include enable-input logic configuration (mixed active-high/low), worst-case tPHL/tPLH timing at 3.3 V and 5 V, latch-up immunity (500 mA at 125 °C), thermal resistance (RθJA = 50 °C/W), and compatibility with EPIC™ CMOS process noise-reduction layout requirements.
Technical Context
The 74AC11138PWR implements a positive-logic 3-to-8 decoder with cascading capability enabled by three independent enable terminals-G1 (active-high) and G2A/G2B (both active-low). Its functional mode table confirms that all eight outputs (Y0–Y7) go high-impedance unless G1 = H and G2A = G2B = L, while select inputs A/B/C determine which single output goes low.
It uses TI's EPIC™ 1-µm CMOS process, delivering rail-to-rail output swing, input thresholds referenced to VCC (VIH = 0.7×VCC, VIL = 0.3×VCC), and robust ESD protection. The center-pin VCC/GND configuration minimizes simultaneous switching noise, and its 50 °C/W junction-to-ambient thermal resistance reflects optimized power dissipation for TSSOP-16 packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 3 V to 5.5 V - supports both 3.3 V and 5 V logic systems without level translation |
| Propagation Delay (tPLH/tPHL) | 5.1 ns min / 7.9 ns max at 5 V - enables sub-10 ns memory decode paths in high-speed systems |
| Output Drive (IOL/IOH) | ±24 mA at 4.5–5.5 V - sufficient to drive multiple TTL or CMOS loads directly |
| Latch-up Immunity | 500 mA typical at 125 °C - meets JEDEC JESD78 Class II requirements for robustness |
| Input Capacitance (Ci) | 3.5 pF at 5 V - low loading on upstream drivers, preserving signal integrity in dense routing |
| Power Dissipation Cap. (Cpd) | 51 pF per gate - enables accurate dynamic power estimation at 1 MHz switching |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and computing applications |
Pinout & Package
TSSOP-16 (PW) package: 5.00 mm × 6.4 mm body, 1.2 mm max height, lead pitch 0.65 mm, RoHS-compliant NIPDAU finish, MSL Level-1 (260 °C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Y1) | Output | Active-low decoded output corresponding to A=0,B=0,C=1 when enabled |
| 2 (Y2) | Output | Active-low decoded output for A=0,B=1,C=0; shares enable logic with all Yx outputs |
| 3 (Y3) | Output | Active-low output for A=0,B=1,C=1; asserted only when G1=H and G2A=G2B=L |
| 4 (GND) | Power | Ground reference for all internal logic and I/O; center-pin placement reduces ground bounce |
| 5 (Y4) | Output | Active-low output for A=1,B=0,C=0; one of eight mutually exclusive outputs |
| 6 (Y5) | Output | Active-low output for A=1,B=0,C=1; no internal pull-up; requires external termination if needed |
| 7 (Y6) | Output | Active-low output for A=1,B=1,C=0; driven low only during valid decode cycle |
| 8 (Y7) | Output | Active-low output for A=1,B=1,C=1; remains high-impedance when any enable is inactive |
| 9 (G2B) | Input | Active-low enable; tied low to activate; used with G2A/G1 for hierarchical decoding |
| 10 (G2A) | Input | Second active-low enable; both G2A and G2B must be low for decode operation |
| 11 (G1) | Input | Active-high enable; used with G2A/G2B to form 3-input AND-enable logic |
| 12 (VCC) | Power | Supply rail; center-pin placement minimizes high-speed switching noise coupling |
| 13 (C) | Input | MSB select input; determines Y4–Y7 vs Y0–Y3 group activation when enabled |
| 14 (B) | Input | Middle-bit select input; combines with A/C to fully define one-of-eight output |
| 15 (A) | Input | LSB select input; transitions on A toggle between adjacent output pairs (e.g., Y0/Y1) |
| 16 (Y0) | Output | Active-low output for A=0,B=0,C=0; first output in truth table sequence |
Key Features
| Feature | Design Value |
|---|---|
| Three enable inputs (G1, G2A, G2B) | Enables hierarchical 24-line or 32-line decoding without external inverters |
| Center-pin VCC and GND | Reduces simultaneous switching noise by minimizing current loop area in high-frequency operation |
| EPIC™ 1-µm CMOS process | Delivers consistent timing across voltage/temperature, low static current (<40 µA), and high noise margin |
| 500-mA latch-up immunity | Ensures reliability under transient overvoltage or ESD events in industrial environments |
| Low propagation delay (5.1 ns min @ 5 V) | Supports memory access times <10 ns, making it suitable for fast SRAM/ROM decoding |
Applications
| Memory Address Decoding | Data Routing in Bus Systems |
|---|---|
Use Scenario: Selecting one of eight memory banks in a 64 KB segmented SRAM architecture using A15–A13 as CBA inputs. IC Role / Device Role / Timing Role: 3-to-8 decoder providing chip-select signals with <8 ns worst-case delay, synchronized to address valid timing. Use Value: Eliminates need for discrete gates or PLD-based decoding, reducing BOM count and board space while maintaining deterministic timing. |
Use Scenario: Distributing a single data stream from a microcontroller UART TX line to eight peripheral UART receivers via enable-controlled path selection. IC Role / Device Role / Timing Role: Demultiplexer using G1 as data input and A/B/C as channel address; outputs drive enable pins of downstream transceivers. Use Value: Enables time-division multiplexing without software overhead; hardware-level channel switching with nanosecond latency. |
| High-Speed Logic Expansion | Industrial Control I/O Selection |
Use Scenario: Cascading two 74AC11138PWR devices to implement a 24-line decoder for FPGA configuration memory mapping. IC Role / Device Role / Timing Role: Master-slave decoding where upper bits select slave device and lower bits select output line within slave. Use Value: Achieves full 24-line decode with zero external logic, preserving timing predictability across all paths. |
Use Scenario: Selecting one of eight analog sensor conditioning channels in an industrial PLC module using isolated digital control lines. IC Role / Device Role / Timing Role: Enabling individual op-amp or ADC driver circuits via active-low Yx outputs driving MOSFET gates. Use Value: Provides galvanically isolated channel selection when paired with optocouplers, meeting IEC 61000-4 immunity requirements. |
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 |
|---|---|---|---|
| SN74HC138PWR | Slower propagation (19 ns typ @ 5 V), lower drive (±4 mA), wider VCC range (2–6 V), higher input capacitance (10 pF) | Better suited for battery-powered or mixed-voltage systems; not recommended for sub-10 ns timing-critical memory decode | Select SN74HC138PWR only when cost or supply voltage flexibility outweighs speed requirements. |
| 74ACT138PWRE4 | Identical pinout and function; faster tPLH/tPHL (4.5 ns min @ 5 V); higher ICC (100 µA max); same TSSOP-16 package | Direct upgrade path for tighter timing margins; requires verification of increased supply current in low-power designs | Choose 74ACT138PWRE4 when >0.6 ns timing margin improvement is required and power budget allows. |
Compared with SN74HC138PWR and 74ACT138PWRE4, the 74AC11138PWR delivers optimal balance of speed (5.1 ns min), drive strength (±24 mA), and industrial temperature support (–40°C to 85°C) in the TSSOP-16 footprint-making it preferred for memory subsystems where timing determinism and noise resilience are primary constraints.
Availability
74AC11138PWR is available at Aetrix Electronics and suitable for high-speed memory decoding, industrial bus routing, FPGA configuration management, and programmable logic expansion requiring stable component supply and long-term industrial lifecycle support.
Supply support for 74AC11138PWR 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 experience in high-reliability industrial and automotive IC design.
The 74AC11138PWR belongs to TI's AC-series advanced CMOS logic family, engineered specifically for high-speed memory decoding and data-routing applications demanding short propagation delays and robust noise immunity.
FAQ
What is the maximum operating frequency supported by the 74AC11138PWR?
The 74AC11138PWR does not specify a maximum clock frequency because it is a combinational logic device-not a clocked sequential circuit. Its usable switching rate is determined by propagation delay (as low as 5.1 ns) and load capacitance. At 5 V with 50 pF load, it supports data routing or address decode transitions up to approximately 100 MHz in practice, limited by system-level setup/hold timing rather than internal clocking.
Can the 74AC11138PWR operate reliably at 3.3 V supply voltage?
Yes, the 74AC11138PWR is fully specified for operation at 3.3 V ± 0.3 V. Its switching characteristics show tPLH/tPHL of 7.2–11.6 ns at 3.3 V, and input thresholds scale with VCC (VIH ≈ 2.1 V, VIL ≈ 0.9 V), ensuring compatibility with standard 3.3 V CMOS logic families. Output drive remains adequate (±12 mA) for driving typical fan-out loads.
How does the enable-input logic of the 74AC11138PWR differ from standard 74LS138 devices?
Unlike the 74LS138 (which uses three active-low enables), the 74AC11138PWR employs mixed-enable logic: G1 is active-high, while G2A and G2B are both active-low. This configuration simplifies cascading-e.g., using G1 as a data input for demultiplexing, or combining G2A/G2B with upstream decode outputs to build larger decoders without external inverters.
Is the 74AC11138PWR pin-compatible with other TSSOP-16 logic devices like the 74AC138?
No-the 74AC11138PWR is not pin-compatible with generic "74AC138" variants. Its pinout is unique: Y0 is on pin 16 (not pin 1), and enable inputs G1/G2A/G2B occupy pins 11/10/9 respectively. Always verify against the official TI pin diagram (Figure 3-1) before PCB layout; substitution requires netlist and footprint revision.
Does the 74AC11138PWR require external pull-up resistors on its outputs?
No-outputs are push-pull CMOS and do not require external pull-ups. Each Yx output actively drives low (to GND) when selected and high-impedance (not high) when deselected. If a logic-high assertion is needed during disable, an external pull-up resistor must be added-but this is application-dependent, not a device requirement.
74AC11138PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 3:8
- Independent Circuits:
- 1
- Current - Output High, Low:
- 24mA, 24mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
74AC11138PWR FAQ
1.How can I place an order for 74AC11138PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC11138PWR 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 74AC11138PWR reliable?
The price and inventory of 74AC11138PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC11138PWR is usually 5 days.
3.What payment methods are accepted for 74AC11138PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC11138PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC11138PWR?
74AC11138PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC11138PWR 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 74AC11138PWR?
For technical support, including 74AC11138PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC11138PWR requirements.
6.How does Aetrix verify that 74AC11138PWR is sourced from the original manufacturer or authorized distributors?
All 74AC11138PWR 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 74AC11138PWR meets industry standards.
7.What is the process for return or replacement of 74AC11138PWR?
All 74AC11138PWR units undergo pre-shipment inspection (PSI). If there is an issue with 74AC11138PWR, 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 74AC11138PWR part is unused and in its original packaging.
Return procedure for 74AC11138PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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