PCMCIA Flash Memory Card
SRV Series
SRAM Memory Card 256KB through 8MB
General Description
Features
• High Performance SRAM memory Card
The WEDC SRAM Series (SRV) 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 @ 5V
250ns @ 3.3V
Packaged in PCMCIA type I or type II housing (type
II for cards with extended battery backup time and
8MB cards), the WEDC SRAM SRV series is based
on 1 or 4Mbit SRAM memories, providing densities
from 256 Kilobytes to 8 Megabytes.
• x8/x16 PCMCIA standard interface
• Low Power CMOS technology provides very low
power and reliable data retention characteristics
- standby current < 100µA typical
The SRV series of SRAM memory cards is a
universal 3V/ 5V power supply 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.
• Rechargeable Lithium battery with recharge circuitry
- eliminates the need for replaceable batteries
- standby current during recharge typically < 2mA
- battery backup time
•7 months - type I card
WEDC’s SRAM cards contain
a rechargeable
•18 months - type II card
lithium battery and recharge circuitry, eliminating the
need for replaceable batteries found in many SRAM
cards.
typical based on 4MB (lower densities will
have greater storage times)
• Unlimited write cycles, no endurance issues
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.
• Optional Features:
• 2KB EEPROM attribute memory containing
CIS
• Optional Hardware Write Protect switch
• PC Card Standard Type I or Type II Form Factor
Block Diagram
4MB SRAM Card Shown
[A1..A19]
address
buffer
SRAM
SRAM
512K x 8
512K x 8
SRAM
SRAM
[A20..A22]
512K x 8
512K x 8
/CSHi
/CSLi
SRAM
512K x 8
SRAM
512K x 8
+
+
+ +
+
decoder
and
CE1#
CE2#
WE#
OE#
REG#
A0
/CSHi
control
logic
SRAM
512K x 8
SRAM
512K x 8
/CS-A
/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 Bat.
1
June 2000 Rev. 1 - ECO #12896
PC Card Products
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