SN74LS224AN3 Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
SN74LS224AN3 is a 16-word by 4-bit synchronous FIFO memory with 3-state outputs from Texas Instruments, featuring 80 ns maximum access time and a 64-bit storage capacity in a 16-pin DIP package. It buffers parallel data between asynchronous logic subsystems operating at different speeds in 5 V TTL systems.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- SN74LS224AN3 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
- 16-word x 4-bit synchronous FIFO with 64-bit total storage
- 80 ns maximum access time for fast TTL bus applications
- 3-state outputs allow direct connection to shared data buses
- Separate read and write clocks support true asynchronous operation
- Full and empty flag outputs prevent data overflow and underflow
- 16-pin DIP package compatible with legacy TTL board sockets
Applications
SN74LS224AN3 is used in vintage and legacy digital systems for rate-matching parallel data streams between processors and peripheral controllers operating at different clock frequencies in 5 V TTL environments. It also serves as a small elastic buffer in data acquisition systems, printer interface boards, and serial-to-parallel converter designs where 64 bits of FIFO buffering is sufficient to absorb burst data transfers without handshaking overhead.
Specifications
| Pbfree Code | No |
| YTEOL | 0 |
| Access Time-Max | 80ns |
| JESD-30 Code | R-PDIP-T16 |
| Memory Density | 64bit |
| Memory IC Type | OTHER FIFO |
| Memory Width | 4 |
| Number of Functions | 1 |
| Number of Words | 16words |
| Number of Words Code | 16 |
| Operating Mode | SYNCHRONOUS |
| Organization | 16X4 |
| Output Enable | YES |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP16,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Parallel/Serial | PARALLEL |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.25V |
| Supply Voltage-Min (Vsup) | 4.75V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | TTL |
| Temperature Grade | COMMERCIAL |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.32.00.71 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How deep and wide is the FIFO in the SN74LS224AN3?
The SN74LS224AN3 implements a 16-word deep by 4-bit wide FIFO, providing 64 bits of total on-chip storage. Data is written 4 bits at a time and read 4 bits at a time, making it a straightforward nibble-width buffer for systems that transfer 4-bit nibbles or where two devices can be paired to handle 8-bit byte data streams.
How fast can data be read from the SN74LS224AN3?
The maximum read access time is 80 ns, which corresponds to a maximum read rate of approximately 12.5 MHz. This speed is adequate for legacy 5 V TTL processors and peripheral controllers that operate on 8 MHz to 10 MHz buses, allowing the FIFO to keep up with data reads without inserting wait states.
In which legacy interface or buffering designs is the SN74LS224AN3 still relevant?
In restoration and maintenance of vintage CNC machines, industrial programmable controllers, and printer interface cards from the 1980s that rely on TTL FIFO chips, the SN74LS224AN3's 16-pin DIP package and 74LS-compatible signal levels make it a direct replacement for the original FIFO IC. Its 80 ns access time and 64-bit depth match the original specification in most such rate-matching buffer circuits.
What do the full and empty flag outputs of SN74LS224AN3 indicate in a data buffering system?
The FULL flag goes active when all 16 words are occupied, signaling the write-side logic to halt writes and preventing data overflow that would corrupt earlier entries. The EMPTY flag goes active when no valid data remains, telling the read-side logic to pause reading and avoid reading invalid data. Together these 2 flags enable hardware handshaking between producer and consumer circuits without software polling.
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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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