CYM1846

The CYM1846 is a high-performance 16-megabit static RAM module organized as 512K words by 32 bits. The CYM1846 is constructed from four 512K x 8 SRAMs in SOJ packages mounted on an epoxy laminate substrate. Four chip selects are used to independently enable the four bytes. Reading or writing can be executed on individual bytes or any combination of multiple bytes through proper use of the chip selects.

The CYM1846 is designed for use with standard 72-pin SIMM socket and ZIP footprint. The pinout of the CYM1846 is compatible with the 64-pin JEDEC ZIP/SIMM module family (CYM1821, CYM1831, CYM1836, and CYM1841) and the 72-pin CYM1851. Thus, a single motherboard design can be used to accommodate memory depth ranging from 16K words (CYM1821) to 1024K words (CYM1851). The standard SIMM can be used in Angled SIMM sockets and is available with either tin-lead or 10 micro-inches of gold flash on the edge contacts.

Presence detect pins (PD₀ PD₃) are used to identify module memory density in applications where the CYM1846 with alternate word depths can be interchanged.