View sae81c52 datasheet:

SAE 81C52 256 x 8-Bit Static CMOS RAM NMOS-Compatible Preliminary DataCMOS IC PFeatures 256 x 8-bit organization Standby mode Compatible with the NMOS and CMOS versions of the microprocessor/microcontroller families SAB 8086, SAB 8051 Very low power dissipation Data retention up to VDD ? 1 V P-DIP-16-1 Three different chip select inputs for two chip select modes No increasing power consumption in standby mode if the control inputs are on undefined potential Temperature range – 40 to 110 °C P-DSO-20-1 Type Ordering Code Package SAE 81C52 P Q67100-H9017 P-DIP-16-1 SAE 81C52 G Q67100-H9015 P-DSO-20-1 (SMD) The SAE 81C52 is a CMOS-silicon gate, static random access memory (RAM), organized as 256 words by 8 bits. The multiplexed address and data bus interfaces di