IS62WV51216EALL Datasheet, PDF (3/18 Pages) Integrated Silicon Solution, Inc – TTL compatible interface levels

IS62/65WV51216EALL
IS62/65WV51216EBLL
FUNCTION DESCRIPTION
SRAM is one of random access memories. Each byte or word has an address and can be accessed randomly. SRAM
has three different modes supported. Each function is described below with Truth Table.
STANDBY MODE
Device enters standby mode when deselected ( HIGH or CS2 LOW or both and are HIGH). The input and
output pins (I/O0-15) are placed in a high impedance state. The current consumption in this mode will be either ISB1 or
ISB2 depending on the input level. CMOS input in this mode will maximize saving power.
WRITE MODE
Write operation issues with Chip selected ( LOW and CS2 HIGH) and Write Enable ( ) input LOW. The input and
output pins(I/O0-15) are in data input mode. Output buffers are closed during this time even if is LOW. and
enables a byte write feature. By enabling LOW, data from I/O pins (I/O0 through I/O7) are written into the location
specified on the address pins. And with being LOW, data from I/O pins (I/O8 through I/O15) are written into the
location.
READ MODE
Read operation issues with Chip selected ( LOW and CS2 HIGH) and Write Enable ( ) input HIGH. When is
LOW, output buffer turns on to make data output. Any input to I/O pins during READ mode is not permitted. and
enables a byte read feature. By enabling LOW, data from memory appears on I/O0-7. And with being LOW,
data from memory appears on I/O8-15.
In the READ mode, output buffers can be turned off by pulling HIGH. In this mode, internal device operates as
READ but I/Os are in a high impedance state. Since device is in READ mode, active current is used.
TRUTH TABLE
Mode
CS2
I/O0-I/O7 I/O8-I/O15 VDD Current
H
X
X
X
X
X
High-Z
High-Z
Not Selected
X
L
X
X
X
X
High-Z
High-Z
ISB1,ISB2
X
X
X
X
H
H
High-Z
High-Z
Output Disabled
L
L
H
H
H
H
H
H
L
X
X
L
High-Z
High-Z
High-Z
High-Z
ICC
L
H
H
L
L
H
DOUT
High-Z
Read
L
H
H
L
H
L
High-Z
DOUT
ICC
L
H
H
L
L
L
DOUT
DOUT
L
H
L
X
L
H
DIN
High-Z
Write
L
H
L
X
H
L
High-Z
DIN
ICC
L
H
L
X
L
L
DIN
DIN
Integrated Silicon Solution, Inc.- www.issi.com
3
Rev. B
10/21/2014