Lansdale Semiconductor, Inc. Datasheets for DRAM and SDRAM Memory Chips

Dynamic random access memory (DRAM) chips are single-transistor memory cells that use small capacitors to store each bit of memory in an addressable format that consists of rows and columns. Because capacitors are unable to hold a charge indefinitely, DRAM memory chips require a near-constant pulse of current to retain stored information.
DRAM and SDRAM Memory Chips: Learn more

Product Name Notes
The 54S00/74S00 series of product is fabricated with a non-saturating Schottky clamped transistor technique. This family of TTL product consists of very high performance and high power devices.
The 82S00 and 82LS00 series product lines consist of Schottky TTL products and Bipolar Memory products.
The Series 54LS/74LS Schottky TTL family features both Schottky-barrier-diode inputs and emitter inputs and utilizes full Schottky-barrier-diode clamping to achieve speeds comparable to Series 54/74 at one-fifth of the power.
These integrated circuits, which were originally manufactured by Signetics, fall under the broad category of Bipolar LSI.