PCMCIA Flash Memory Card
SRV Series
SRAM Memory Card
General Description
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.
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.
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.
WEDC鈥檚 SRAM cards contain a rechargeable
lithium battery and recharge circuitry, eliminating the
need for replaceable batteries found in many SRAM
cards.
WEDC鈥檚 standard cards are shipped with WEDC鈥檚
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.
256KB through 8MB
Features
鈥?/div>
High Performance SRAM memory Card
鈥?Universal 3.3 to 5 Volt Supply allows for wider
compatibility between systems.
鈥?Fast Access times: 150ns @ 5V
250ns @ 3.3V
鈥?x8/x16 PCMCIA standard interface
鈥?Low Power CMOS technology provides very low
power and reliable data retention characteristics
- standby current < 100碌A(chǔ) typical
鈥?Rechargeable Lithium battery with recharge circuitry
- eliminates the need for replaceable batteries
- standby current during recharge typically < 2mA
- battery backup time
鈥? months - type I card
鈥?8 months - type II card
typical based on 4MB (lower densities will
have greater storage times)
鈥?Unlimited write cycles, no endurance issues
鈥?Optional Features:
鈥?2KB EEPROM attribute memory containing
CIS
鈥?Optional Hardware Write Protect switch
鈥?PC Card Standard Type I or Type II Form Factor
Block Diagram
4MB SRAM Card Shown
[A1..A19]
address
buffer
SRAM
512K x 8
[A20..A22]
/CSHi
+ + + + +
CE1#
CE2#
WE#
OE#
REG#
A0
decoder
and
control
logic
/CSLi
/CS-A
/RD
/RD
/WR
/WR
CTRL
SRAM
512K x 8
SRAM
512K x 8
SRAM
512K x 8
SRAM
512K x 8
SRAM
512K x 8
SRAM
512K x 8
SRAM
512K x 8
/CSHi
[A1..A11]
S1
WP
Write Prot
Switch
VS1
VS2
GND
GND
NC
Vcc
/CS-A
/RD
/WR
ATTRIBUTE
MEMORY
CTRL
I/O BUFFER
[DO..D7]
[DO..D7]
[D8..D15]
+
BVD1
BVD2
Vcc
[D8..D15]
Notes: 1. pull down resistor (min 100k)
Power Management
and
Battery Control
to internal
power
supply
+
2. pull up resistor (min 10k)
Lithium Bat.
June 2000 Rev. 1 - ECO #12896
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