CYM1831

Features:

• High-density 2-Mbit SRAM module
• 32-bit standard footprint supports densities from 16K x 32 through 1M x 32
• High-speed CMOS SRAMs
-Access time of 15 ns
• Low active power
-5.3W (max.)
• SMD technology
• TTL-compatible inputs and outputs
• Low profile
-Max. height of 0.50 in.
• Small PCB footprint
-1.2 sq. in.


Pinout




Specifications

Storage Temperature ...............................................65°C to +150°C
Ambient Temperature with Power Applied................ 55°C to +125°C
Supply Voltage to Ground Potential ............................... 0.5V to +7.0V
DC Voltage Applied to Outputs in High Z State .............. 0.5V to +7.0V
DC Input Voltage............................................................ 0.5V to +7.0V
Output Current into Outputs (LOW) ..............................................20 mA


Description

The CYM1831 is a high-performance 2-Mbit static RAM module organized as 64K words by 32 bits. The CYM1831 is constructed from eight 64K x 4 SRAMs in SOJ packages mounted on an epoxy laminate board with pins. Four chip selects (CS1, CS2, CS3, and CS4) 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 selects.
Writing to each byte is accomplished when the appropriate Chip Selects (CSN) and Write Enable (WE) inputs are both LOW. Data on the input/output pins (I/OX) is written into the memory location specified on the address pins (A0 through A15).
Reading the CYM1831 is accomplished by taking the Chip Selects (CSN) LOW and Output Enable (OE) LOW while Write Enable (WE) remains HIGH. Under these conditions the contents of the memory location specified on the address pins will appear on the data input/output pins (I/OX).
The data input/output pins of the CYM1831 stay in the high-impedance state when Write Enable (WE) is LOW or the appropriate chip selects are HIGH.
Two pins (PD0 and PD1) of  the CYM1831 are used to identify module memory density in applications where alternate versions of the JEDEC-standard modules can be interchanged.