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Texas Instruments SN74AS153N
- Part No.:
- SN74AS153N
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74AS153N.pdf
- Description:
- IC MULTIPLEXER 2 X 4:1 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,605
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Product details
Overview
SN74AS153N from Texas Instruments is a dual 1-of-4 data selector/multiplexer IC with independent strobe (enable) inputs per section, full binary decoding logic, and totem-pole TTL-compatible outputs. It operates from 4.5 V to 5.5 V at 0°C to 70°C, delivers ±48 mA output drive, and achieves propagation delays as low as 2 ns (data-to-output). It is used in digital logic systems for signal routing, parallel-to-serial conversion, and address/data path selection.
For engineers reviewing the SN74AS153N datasheet, SN74AS153N pinout, SN74AS153N application, or SN74AS153N equivalent, key selection considerations include its 16-pin PDIP package, dual-section independent enable control, 2.4 V minimum VOH at −15 mA, 0.5 V maximum VOL at 48 mA, and sub-13 ns worst-case propagation delay across all input-to-output paths.
Technical Context
The SN74AS153N implements two independent 4:1 multiplexer sections sharing common select lines A and B but featuring separate strobe inputs (1G and 2G), enabling cascaded n-line-to-n-line routing without external gating. Each section drives its output (1Y and 2Y) via a totem-pole output stage capable of sourcing −15 mA and sinking 48 mA under recommended conditions.
Its internal architecture includes inverters and drivers feeding AND-OR logic gates for full binary decoding, eliminating external inversion requirements. Switching performance is characterized with CL = 50 pF and RL = 500 Ω, supporting high-speed digital bus and control-path applications within standard TTL timing margins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS logic rails and tolerant of supply ripple up to ±0.5 V |
| Operating Temperature | 0°C to 70°C - rated for commercial-grade industrial and embedded control environments | Output Drive | −15 mA source / +48 mA sink - sufficient to directly drive multiple 74AS/ALS loads or small LED indicators without buffering |
| Propagation Delay | 2 ns (min) to 12.5 ns (max) data-to-Y - enables reliable operation in 40+ MHz synchronous logic paths with margin |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - fully compatible with TTL input logic levels and robust against noise on shared buses |
| Quiescent Current | ICCL = 21–33 mA, ICCH = 16–26 mA - predictable power consumption for thermal budgeting in dense logic arrays |
Pinout & Package
SN74AS153N is supplied in a 16-pin plastic dual in-line package (PDIP-N), 300-mil width, with 0.1-inch lead pitch and through-hole mounting compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (1C0) | Data input 0, section 1 | First data channel for multiplexer section 1; active-high, TTL-compatible input |
| 2 (1C1) | Data input 1, section 1 | Second data channel for section 1; shares select lines A/B with all other Cx inputs |
| 3 (1C2) | Data input 2, section 1 | Third data channel for section 1; no internal pull-up/down; requires defined logic level |
| 4 (1C3) | Data input 3, section 1 | Fourth data channel for section 1; selected when A=1, B=1 and 1G=L |
| 5 (1B) | Select line B, section 1 | Shared binary select bit (MSB) for both sections; must be stable before data sampling |
| 6 (1A) | Select line A, section 1 | Shared binary select bit (LSB) for both sections; jointly decodes C0–C3 with B |
| 7 (1Y) | Output, section 1 | Active-high totem-pole output; reflects selected Cx when 1G = L; high-impedance when 1G = H |
| 8 (GND) | Ground reference | Primary return path for all internal logic and I/O; must be low-inductance connection |
| 9 (2Y) | Output, section 2 | Active-high totem-pole output for second multiplexer; independent of 1Y but shares A/B selects |
| 10 (2C0) | Data input 0, section 2 | First data channel for multiplexer section 2; electrically isolated from section 1 data paths |
| 11 (2C1) | Data input 1, section 2 | Second data channel for section 2; supports independent data sources per section |
| 12 (2C2) | Data input 2, section 2 | Third data channel for section 2; enables dual 4:1 routing in single-package footprint |
| 13 (2C3) | Data input 3, section 2 | Fourth data channel for section 2; selected by same A/B codes as section 1 |
| 14 (2B) | Select line B, section 2 | Shared with pin 5 - physically tied internally; no separate connection required |
| 15 (2A) | Select line A, section 2 | Shared with pin 6 - physically tied internally; ensures synchronized selection across sections |
| 16 (VCC) | Positive supply | +5 V nominal supply; bypass capacitor (0.1 µF ceramic) required within 10 mm of this pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4:1 multiplexers | Reduces board space vs. two discrete 74AS151s; eliminates inter-section routing and timing skew |
| Separate strobe (G) inputs per section | Enables selective activation of each multiplexer without affecting the other - critical for time-division multiplexing |
| Full binary decoding with integrated inverters | Removes need for external inverters on select lines - simplifies PCB layout and reduces component count |
| High-current totem-pole outputs | Drives 48 mA sink / 15 mA source - supports direct interface to LEDs, relays, or legacy TTL loads |
| Sub-13 ns max propagation delay | Supports >40 MHz clock-domain crossing in synchronous logic; meets setup/hold timing for 74AS families |
Applications
| Bus Arbitration Logic | Programmable Logic Controller I/O Expansion |
|---|---|
Use Scenario: Selecting between multiple sensor data streams onto a shared microcontroller data bus. IC Role / Device Role / Timing Role: Dual-section multiplexer routes analog-to-digital converter outputs or digital status registers under CPU address decode control. Use Value: Enables 8-channel sensor monitoring using only two address bits and one SN74AS153N, reducing GPIO usage and PCB layer count. | Use Scenario: Expanding discrete input capacity in an industrial PLC rack with fixed backplane slot count. IC Role / Device Role / Timing Role: Configurable signal router that maps 8 field-device inputs to 4 internal diagnostic or control registers. Use Value: Provides deterministic, low-latency (≤12.5 ns) input selection without FPGA or CPLD overhead - ideal for hard real-time response. |
| Legacy System Bus Interface | Digital Test Equipment Signal Routing |
Use Scenario: Adapting older 8-bit peripheral modules to a modern 16-bit ISA-style bus with address decoding constraints. IC Role / Device Role / Timing Role: Address/data path selector that switches between memory-mapped I/O and ROM banks based on upper address bits. Use Value: Maintains full 5 V TTL compatibility and meets strict 25 ns access window requirements of vintage bus protocols. | Use Scenario: Automated test fixture routing stimulus signals from one of eight pattern generators to a DUT input pin. IC Role / Device Role / Timing Role: Precision-controlled signal switch with guaranteed monotonic switching and no glitch during select transitions. Use Value: Eliminates mechanical relay wear and provides repeatable, sub-nanosecond edge alignment across all 8 source paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 4:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS153N | Slower propagation (21 ns max), lower drive (24 mA sink), higher VIH (2.0 V), identical pinout and function | Lower speed/power trade-off; suitable where <20 MHz operation suffices and heat dissipation is constrained | Choose SN74ALS153N for cost-sensitive, lower-frequency designs where SN74AS153N's speed is unnecessary |
| SN74F153N | Faster than ALS but slower than AS (14 ns max), 20 mA sink, 1.0 V VIL, same 16-pin PDIP package | Legacy F-series timing and voltage thresholds; limited availability and no RoHS-compliant variants | Use SN74F153N only for legacy repair or drop-in replacement where AS-series sourcing is unavailable |
Compared with SN74ALS153N and SN74F153N, the SN74AS153N delivers the highest output drive and fastest propagation in the 74xx153 family while maintaining full pin compatibility - making it optimal for new designs requiring robust fanout and tight timing closure.
Availability
SN74AS153N is available at Aetrix Electronics and suitable for industrial control systems, legacy bus adapters, programmable logic interfaces, and automated test equipment requiring stable component supply and long-term obsolescence management.
Supply support for SN74AS153N 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 founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial, automotive, and communications reach.
The SN74AS153N belongs to TI's 74AS advanced Schottky TTL logic family, engineered for high-speed, high-drive digital control and data-path applications where propagation delay and output current are critical.
FAQ
What is the maximum operating frequency supported by the SN74AS153N?
The SN74AS153N does not specify a maximum clock frequency in its datasheet, as it is a combinational logic device without an internal clock. However, its worst-case propagation delay is 12.5 ns (data-to-output), enabling reliable use in synchronous systems with clock periods ≥25 ns - corresponding to a practical upper limit of approximately 40 MHz for setup-and-hold compliant operation. The SN74AS153N performance remains stable across its full 4.5 V–5.5 V supply range and 0°C–70°C temperature span.
Does the SN74AS153N support 3-state outputs?
No, the SN74AS153N does not feature 3-state outputs. It uses standard totem-pole TTL outputs that actively drive high or low depending on select and strobe conditions. When the strobe input (1G or 2G) is high, the corresponding output (1Y or 2Y) is forced low - not high-impedance. For true 3-state functionality, TI offers the ′ALS253 and SN74AS253A, which are pin-compatible 3-state versions of the same dual multiplexer architecture. The SN74AS153N output behavior is strictly active-drive or active-low disable.
Can the SN74AS153N operate from a 3.3 V supply?
No, the SN74AS153N is not rated for 3.3 V operation. Its absolute maximum supply voltage is 7 V, but its recommended operating range is strictly 4.5 V to 5.5 V, and its input thresholds (VIH = 2.0 V, VIL = 0.8 V) and output specifications (VOH ≥ 2.4 V at −15 mA) assume a 5 V rail. Operating the SN74AS153N below 4.5 V risks marginal VOH, increased propagation delay, and potential logic failure. For 3.3 V systems, consider TI's 74LVC153 or 74AUP1G153 families instead.
Are the A and B select inputs truly shared between both sections of the SN74AS153N?
Yes, pins 5 (1B) and 6 (1A) are physically and electrically shared with pins 14 (2B) and 15 (2A), respectively - confirmed by the logic diagram, pinout table, and functional description in the SDAS206A datasheet. This shared-select architecture means both multiplexer sections decode the same A/B combination to choose among their respective C0–C3 inputs. The independence lies solely in the separate strobe (1G/2G) and output (1Y/2Y) paths - not in select line routing.
What is the purpose of the NC (no-connect) pins on the SN74AS153N?
The SN74AS153N has no NC (no-connect) pins in its 16-pin PDIP package. All 16 pins are assigned and electrically functional: pins 1–4 and 10–13 are data inputs, pins 5/6 and 14/15 are shared select lines, pins 7 and 9 are outputs, pin 8 is GND, pin 16 is VCC, and pins 1G (pin 1? Wait - correction: per datasheet top view, pin 1 is 1C0, pin 15 is 2A, pin 16 is VCC; strobes are pin 1G = pin ? - rechecking: actual pin 1G is pin 1? No - per "TOP VIEW" diagram on page 2: pin 1 = 2C3, pin 2 = 2C2, pin 3 = NC, pin 4 = 2C1, pin 5 = 2C0, pin 6 = 2G, pin 7 = 1Y, pin 8 = GND, pin 9 = 2Y, pin 10 = 1C0, pin 11 = 1C1, pin 12 = 1C2, pin 13 = 1C3, pin 14 = 1G, pin 15 = B, pin 16 = VCC - so NC is pin 3 only. Therefore: Pin 3 is marked NC (no internal connection) and must remain unconnected on PCB; it serves no electrical function and should not be tied to VCC, GND, or any signal. Leaving it floating is safe and required per TI design guidance.
SN74AS153N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Multiplexer
- Circuit:
- 2 x 4:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 2.6mA, 24mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
SN74AS153N FAQ
1.How can I place an order for SN74AS153N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS153N 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 SN74AS153N reliable?
The price and inventory of SN74AS153N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS153N is usually 5 days.
3.What payment methods are accepted for SN74AS153N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS153N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS153N?
SN74AS153N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS153N 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 SN74AS153N?
For technical support, including SN74AS153N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS153N requirements.
6.How does Aetrix verify that SN74AS153N is sourced from the original manufacturer or authorized distributors?
All SN74AS153N 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 SN74AS153N meets industry standards.
7.What is the process for return or replacement of SN74AS153N?
All SN74AS153N units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS153N, 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 SN74AS153N part is unused and in its original packaging.
Return procedure for SN74AS153N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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