PCMCIA SRAM Memory Card  
					SRV20 Series  
					SRAM Memory Card 2MB through 16MB  
					General Description  
					Features  
					• High Performance SRAM memory Card  
					The WEDC SRAM Series (SRV20) memory cards  
					offer a high performance nonvolatile storage solution  
					for code and data storage, disk caching, and write  
					intensive mobile and embedded applications.  
					• Universal 3.3 to 5 Volt Supply allows for wider  
					compatibility between systems.  
					• Fast Access times: 150ns @ 3.3V – 5V  
					• x8/x16 PCMCIA standard interface  
					Packaged in PCMCIA type I or type II housing (type  
					II for cards with extended battery backup time), the  
					WEDC SRAM SRV20 series is based on high  
					density and super low power SRAM memory  
					devices, providing densities from 2MBytes to  
					16MBytes.  
					• Low Power CMOS technology provides very low  
					power and reliable data retention characteristics  
					- standby current < 100µA typical  
					• Rechargeable Lithium battery with recharge circuitry  
					- eliminates the need for replaceable batteries  
					- standby current during recharge typically < 2mA  
					- battery backup time  
					• 18 months - type I card  
					• 40 months - type II card  
					The SRV20 series of SRAM memory cards has a  
					universal wide power supply (3V to 5V) and operates  
					at speeds as high as 150ns. The cards are based on  
					advanced CMOS technology providing very low  
					power and reliable data retention characteristics.  
					WEDC’s SRAM cards contain a rechargeable  
					lithium battery and recharge circuitry, eliminating the  
					need for replaceable batteries found in many SRAM  
					cards.  
					typical based on 4MB  
					• Unlimited write cycles, no endurance issues  
					• Optional Features:  
					• 2KB EEPROM attribute memory containing CIS  
					• Optional Hardware Write Protect switch  
					WEDC’s standard cards are shipped with WEDC’s  
					SRAM Logo. Cards are also available with blank  
					housings (no Logo). The blank housings are available  
					in both a recessed (for label) and flat housing. Please  
					contact WEDC sales representative for further  
					information on Custom artwork.  
					• PC Card Standard Type I or Type II Form Factor  
					Block Diagram  
					16MB SRAM Card Shown  
					Address  
					[A1..A21]  
					buffer  
					SRAM  
					2M x 8  
					SRAM  
					2M x 8  
					SRAM  
					2M x 8  
					SRAM  
					2M x 8  
					[A22..A23]  
					/CSHi  
					SRAM  
					2M x 8  
					SRAM  
					2M x 8  
					+
					+
					+ +  
					+
					decoder  
					and  
					/CSLi  
					/CS-A  
					CE1#  
					CE2#  
					WE#  
					OE#  
					REG#  
					A0  
					/CSHi  
					SRAM  
					2M x 8  
					SRAM  
					2M x 8  
					logic  
					control  
					/RD  
					/WR  
					CTRL  
					/RD  
					/WR  
					[A1..A11]  
					/CS-A  
					/RD  
					/WR  
					S1  
					ATTRIBUTE  
					MEMORY  
					Vcc  
					WP  
					Write Prot  
					Switch  
					VS1  
					VS2  
					GND  
					GND  
					NC  
					CTRL  
					I/O BUFFER  
					[DO..D7]  
					[D8..D15]  
					[DO..D7]  
					[D8..D15]  
					Notes: 1. pull down resistor (min 100k)  
					2. pull up resistor (min 10k)  
					Vcc  
					+
					Power Management  
					and  
					BVD1  
					BVD2  
					+
					Battery Control  
					to internal  
					power  
					supply  
					Lithium Battery  
					1
					November 2001 Rev. 1 - ECO #xxxx  
					PC Card Products