GS8182S08 Datasheet, PDF (6/36 Pages) GSI Technology – 18Mb Burst of 2 SigmaSIO DDR-IITM SRAM

GS8182S08/09/18/36BD-400/375/333/300/250/200/167
Pin Description Table
Symbol
Description
Type
Comments
SA
Synchronous Address Inputs
Input
—
R/W
Read/Write Contol Pin
Input
Write Active Low; Read Active High
NW0–NW1
Synchronous Nybble Writes
Input
Active Low
x08 Only
BW
Synchronous Byte Writes
Input
Active Low
x09 Only
BW0–BW3
Synchronous Byte Writes
Input
Active Low
x18/x36 Only
K
Input Clock
Input
Active High
C
Output Clock
Input
Active High
TMS
Test Mode Select
Input
—
TDI
Test Data Input
Input
—
TCK
Test Clock Input
Input
—
TDO
Test Data Output
Output
—
V_REF
HSTL Input Reference Voltage
Input
—
ZQ
Output Impedance Matching Input
Input
—
K
Input Clock
Input
Active Low
C
Output Clock
Output
Active Low
D_OFF
DLL Disable
—
Active Low
LD
Synchronous Load Pin
—
Active Low
CQ
Output Echo Clock
Output
Active Low
CQ
Output Echo Clock
Output
Active High
Dn
Synchronous Data Inputs
Input
—
Qn
Synchronous Data Outputs
Output
—
V_DD
Power Supply
Supply
1.8 V Nominal
V_DDQ
Isolated Output Buffer Supply
Supply
1.8 or 1.5 V Nominal
V_SS
Power Supply: Ground
Supply
—
NC
No Connect
—
—
Notes:
1. C, C, K, or K cannot be set to V_REF voltage.
2. When ZQ pin is directly connected to V_DD, output impedance is set to minimum value and it cannot be connected to ground or left
unconnected.
3. NC = Not Connected to die or any other pin.
Background
Separate I/O SRAMs, like SigmaQuad SRAMs, are attractive in applications where alternating reads and writes are needed. On the
other hand, Common I/O SRAMs like the SigmaCIO family are popular in applications where bursts of read or write traffic are
needed. The SigmaSIO SRAM is a hybrid of these two devices. Like the SigmaQuad family devices, the SigmaSIO features a
separate I/O data path, offering the user independent Data In and Data Out pins. However, the SigmaSIO devices offer a control
Rev: 1.03c 11/2011
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Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
© 2007, GSI Technology