SN74LS156DRG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
SN74LS156DRG4 is a dual 2-line to 4-line decoder/demultiplexer with open-collector outputs, operating from 4.75 V to 5.25 V TTL supply, configurable as a 1-to-8 demultiplexer, featuring 8 mA sink current per output and 15 pF load capacity in a 16-pin SOIC package.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- SN74LS156DRG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74LS156DRG4?
- Dual 2-to-4 line decoder/demultiplexer in a single package
- Configurable as a 1-to-8 demultiplexer by tying sections together
- Open-collector outputs with 8 mA sink current capability
- 4.75 V to 5.25 V TTL supply voltage range
- 15 pF load capacitance rating for fast logic operation
- LS low-power Schottky technology for reduced power dissipation
- 16-pin SOIC package for surface-mount assembly
What is SN74LS156DRG4 used for?
SN74LS156DRG4 is used in address decoding circuits for memory and peripheral chip-select generation, where 2-bit address lines must select one of four or eight output lines. It serves as a demultiplexer in data bus distribution systems, routing a single TTL-level data stream to up to 8 downstream devices with open-collector outputs. The device is also suitable for LED matrix row/column driving and relay bank sequencing in industrial automation where active-low open-collector signals are required.
What are the specifications of SN74LS156DRG4?
| YTEOL | 0 |
| Additional Feature | USABLE AS 1 TO 8 DEMULTIPLEXER |
| Family | LS |
| Input Conditioning | STANDARD |
| JESD-30 Code | R-PDSO-G16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 15pF |
| Logic IC Type | 2-LINE TO 4-LINE DECODER |
| Max I(ol) | 0.008A |
| Number of Bits | 4 |
| Number of Functions | 2 |
| Output Characteristics | OPEN-COLLECTOR |
| Output Polarity | INVERTED |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 10mA |
| Prop. Delay@Nom-Sup | 27ns |
| Propagation Delay (tpd) | 51ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.25V |
| Supply Voltage-Min (Vsup) | 4.75V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | TTL |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Mexico |
Where can I find the SN74LS156DRG4 datasheet?
SN74LS156DRG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74LS156DRG4?
Compatible alternatives and drop-in replacements for SN74LS156DRG4:
Frequently Asked Questions
How can SN74LS156DRG4 be configured as a 1-to-8 demultiplexer?
By connecting the two 2-to-4 decoder sections in parallel with a common 2-bit address bus and using the separate enable inputs to select either section, SN74LS156DRG4 operates as a 1-to-8 demultiplexer routing a single active-low data signal to 1 of 8 open-collector output lines.
What makes SN74LS156DRG4 suitable for bus pull-up resistor designs versus standard totem-pole decoders?
SN74LS156DRG4 open-collector outputs allow multiple devices to drive a common line with a shared pull-up resistor, enabling wired-OR bus connections. Each output sinks 8 mA at up to 0.4 V, suitable for driving passive loads up to a 30 V pulled-up bus voltage beyond the 5 V supply.
Which memory chip-select decoding scenario benefits from SN74LS156DRG4's dual-section architecture?
In an 8 K-byte memory bank design, SN74LS156DRG4's two 2-to-4 sections allow A13 and A14 address bits to select 4 SRAM chips per section, covering 8 chip-select lines from a single 16-pin SOIC package and reducing IC count versus two separate quad decoders.
How does SN74LS156DRG4 compare to SN74LS138 for a 3-to-8 decode function?
SN74LS138 is a 3-to-8 decoder with totem-pole active-low outputs, providing 8 unique decode outputs from 3 input bits in a 16-pin package. SN74LS156DRG4 covers only 2-to-4 decode per section with open-collector outputs, which is better when bus sharing or higher sink voltage is needed, but SN74LS138 is preferred for standard address decoding of a full 8-line output.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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