SN74ALS561ADWRG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The SN74ALS561ADWRG4 is an 8-bit binary up-counter from Texas Instruments' Advanced Low-power Schottky (ALS) logic family. It features terminal count output, count enable inputs, synchronous load/preset, 30 MHz maximum clock frequency, and 8 mA output sink current in a 20-pin SOIC package. From $2.00 in stock worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN74ALS561ADWRG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 8-bit synchronous up-counter with terminal count output for cascading multi-counter chains
- Count enable inputs and synchronous load/preset for flexible counter control
- 30 MHz maximum clock frequency in the proven ALS low-power Schottky logic family
- Green RoHS-compliant 20-pin SOIC package for modern industrial and embedded designs
Applications
The SN74ALS561ADWRG4 is suited for event counting, frequency division, and timing control circuits in industrial automation, test equipment, and digital communication systems. Its synchronous load and preset capability allows initialization to any count value, making it useful for programmable timer and sequencer designs. The terminal count output enables cascading multiple devices to build wider 16-bit or 32-bit counter chains without additional glue logic.
Specifications
| YTEOL | 0 |
| Additional Feature | TCO OUTPUT; COUNT ENABLE INPUTS |
| Count Direction | UP |
| Family | ALS |
| JESD-30 Code | R-PDSO-G20 |
| Load Capacitance (CL) | 50pF |
| Load/Preset Input | YES |
| Logic IC Type | BINARY COUNTER |
| Max Frequency@Nom-Sup | 30000000Hz |
| Max I(ol) | 0.008A |
| Mode of Operation | SYNCHRONOUS |
| Number of Bits | 4 |
| Number of Functions | 1 |
| Output Characteristics | 3-STATE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP20,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Power Supply Current-Max (ICC) | 36mA |
| Prop. Delay@Nom-Sup | 18ns |
| Propagation Delay (tpd) | 18ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | TTL |
| Temperature Grade | COMMERCIAL |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Trigger Type | POSITIVE EDGE |
| fmax-Min | 30MHz |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN74ALS561ADWRG4:
Binary Counter, ALS Series, Synchronous, Positive Edge Triggered, 4-Bit, Bidirectional, TTL, PDSO16
Binary Counter, ALS Series, Synchronous, Positive Edge Triggered, 4-Bit, Bidirectional, TTL, PDSO16
Frequently Asked Questions
What type of counter is the SN74ALS561ADWRG4?
The SN74ALS561ADWRG4 is an 8-bit synchronous binary up-counter from the ALS (Advanced Low-power Schottky) logic family. It counts upward from 0 to 255 (0xFF) and provides a terminal count output (TCO) that goes high when the maximum count is reached, enabling cascading with additional counter stages.
What is the maximum clock frequency of the SN74ALS561ADWRG4?
The SN74ALS561ADWRG4 operates at a maximum clock frequency of 30 MHz under nominal supply conditions. This makes it suitable for medium-speed counting and timing applications in industrial control systems, digital instrumentation, and legacy logic designs requiring ALS-family compatibility.
Does the SN74ALS561ADWRG4 have a preset or load function?
Yes, the SN74ALS561ADWRG4 includes synchronous load and preset inputs that allow any 8-bit value to be loaded into the counter on the next clock edge. This enables use as a programmable down-modulo counter or for initializing the count to a specific starting value without requiring a power-on reset.
What package does the SN74ALS561ADWRG4 come in?
The SN74ALS561ADWRG4 is packaged in a 20-pin wide-body SOIC (R-PDSO-G20) surface-mount package. The SOIC-20 format is easy to prototype with, widely supported by PCB footprint libraries, and provides sufficient pin pitch for reliable automated assembly.
Can the SN74ALS561ADWRG4 be cascaded to make wider counters?
Yes, the terminal count output (TCO) of the SN74ALS561ADWRG4 connects directly to the count enable input of the next stage, allowing simple cascading to create 16-bit, 24-bit, or wider synchronous counters. This ripple-enable scheme maintains synchronous operation across all cascaded stages with minimal propagation delay.
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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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