km684000b Samsung Semiconductor, Inc., km684000b Datasheet - Page 7

• Manufacturer Part Number: km684000b
• Description: 512kx8 Bit Low Power Cmos Static Ram
• Manufacturer: Samsung Semiconductor, Inc.

DATA RETENTION WAVE FORM
KM684000B Family
NOTES (WRITE CYCLE)
1. A write occurs during the overlap of a low CS and a low WE. A write begins at the latest transition among CS going Low and WE
2. t
3. t
4. t
TIMING WAVEFORM OF WRITE CYCLE(1)
TIMING WAVEFORM OF WRITE CYCLE(2)
CS controlled
going low : A write end at the earliest transition among CS going high and WE going high, t
to the end of write.
CW
AS
WR
Address
CS
WE
Data in
Data out
Address
CS
WE
Data in
Data out
V
4.5V
2.2V
V
CS
GND
CC
DR
is measured from the address valid to the beginning of write.
is measured from the CS going low to end of write.
is measured from the end of write to the address change. t
Data Undefined
High-Z
t
SDR
t
t
AS(3)
AS(3)
(CS Controlled)
(WE Controlled)
WR
applied in case a write ends as CS or WE going high.
Data Retention Mode
t
WHZ
t
AW
7
t
CS V
AW
t
t
WC
CW(2)
t
CW(2)
t
WC
t
t
CC
WP(1)
WP(1)
- 0.2V
t
t
DW
DW
Data Valid
Data Valid
WP
is measured from the begining of write
t
t
WR(4)
WR(4)
t
t
DH
DH
t
OW
High-Z
t
RDR
CMOS SRAM
September 1998
Revision 3.0