GS8662T20/38CGD-633/550/500
Pin Description Table
Description
Type
Comments
Symbol
Synchronous Address Inputs
Input
Input
—
SA
High: Read
Low: Write
Synchronous Read/Write
R/W
Synchronous Byte Writes
Synchronous Load Pin
Input Clock
Input
Input
Input
Input
Input
Input
Input
Output
Input
Active Low
BW0–BW3
LD
Active Low
Active High
K
Input Clock
Active Low
K
Test Mode Select
Test Data Input
—
—
—
—
—
TMS
TDI
Test Clock Input
TCK
TDO
VREF
Test Data Output
HSTL Input Reference Voltage
Output Impedance Matching Input
Must Connect Low
Data I/O
Input
—
—
ZQ
MCL
DQ
—
Three State
Active Low
—
Input/Output
Input
Disable PLL when low
Output Echo Clock
Output Echo Clock
Doff
CQ
Output
Output
—
CQ
Power Supply
Supply
Supply
Supply
1.8 V Nominal
1.8 V or 1.5 V Nominal
—
VDD
VDDQ
VSS
Isolated Output Buffer Supply
Power Supply: Ground
Q Valid Output
On-Die Termination
No Connect
Output
Input
—
—
Active High
—
QVLD
ODT
NC
Notes:
1. NC = Not Connected to die or any other pin
2. When ZQ pin is directly connected to VDDQ, output impedance is set to minimum value. It should not be directly connected to ground or left
unconnected.
Rev: 1.01 9/2019
4/24
© 2019, GSI Technology
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.