SN74LS189AN Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
The SN74LS189AN is a 64-bit (16x4) asynchronous static RAM from Texas Instruments in a 16-pin DIP through-hole package. It provides a 4-bit wide by 16-word deep memory organization with an 80 ns maximum access time for fast small-buffer applications. From $2.10 in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- SN74LS189AN Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $3.3000(MOQ 1)
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 16x4 organization provides 64 bits of high-speed static RAM accessible in a single read or write cycle without clock synchronization
- 80 ns maximum access time enables asynchronous operation compatible with a wide range of legacy and discrete logic-based CPU systems
- 16-pin DIP package offers easy breadboard prototyping and direct installation in IC sockets for legacy system repair and education
- Low-power Schottky (LS) technology balances speed and power consumption suitable for small memory buffer applications
Applications
The SN74LS189AN is used in small scratch-pad memory buffers, address decoding tables, and look-up table implementations in discrete logic-based CPU designs and retrocomputing projects. Its asynchronous 16x4 SRAM organization makes it ideal for FIFO buffers, state machine storage, and character generator lookup in vintage microcomputer restoration and embedded control prototypes. The through-hole DIP package ensures compatibility with older PCB designs and educational kits that rely on socketed logic ICs.
Specifications
| YTEOL | 0 |
| Access Time-Max | 80ns |
| JESD-30 Code | R-PDIP-T16 |
| Memory Density | 64bit |
| Memory IC Type | STANDARD SRAM |
| Memory Width | 4 |
| Number of Words | 16words |
| Number of Words Code | 16 |
| Operating Mode | ASYNCHRONOUS |
| Organization | 16X4 |
| Output Characteristics | 3-STATE |
| 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) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| 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 | 8542.32.00.41 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the memory organization of the SN74LS189AN?
The SN74LS189AN is organized as 16 words of 4 bits each, giving a total capacity of 64 bits. This 16x4 configuration allows the device to store small nibble-wide data tables or serve as a fast look-up table in discrete logic systems where a few bytes of on-chip RAM is sufficient.
What is the access time of the SN74LS189AN?
The SN74LS189AN has a maximum access time of 80 ns, which allows it to operate with older 8-bit and 16-bit microprocessors running at typical bus speeds without wait states. The asynchronous operation means address and data are valid after this fixed propagation delay with no clock required.
What package does the SN74LS189AN come in?
The SN74LS189AN is housed in a 16-pin PDIP (Plastic Dual In-Line Package) through-hole package coded R-PDIP-T16. This classic through-hole format is compatible with standard IC sockets, breadboards, and perf boards, making it convenient for prototyping, education, and legacy system maintenance.
Is the SN74LS189AN synchronous or asynchronous?
The SN74LS189AN operates asynchronously, meaning read and write operations are triggered by address and chip select signals rather than a clock edge. Data appears at the output within 80 ns of a valid address and active chip select, simplifying use in glue-logic and discrete memory systems without requiring clock synchronization.
What are typical applications for the SN74LS189AN?
Typical applications include look-up tables for character generators, small scratch-pad buffers in embedded controller designs, FIFO stage storage in discrete logic data paths, and retrocomputing projects replicating or repairing vintage computer memory systems. Its small size and simple interface also suit educational digital logic laboratory exercises demonstrating static RAM fundamentals.
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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.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $4.5000 | $4.50 |
| 3+ | $3.7500 | $11.25 |
| 8+ | $3.3000 | $26.40 |
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