CY7C025AV-25AC Cypress Semiconductor Corp, CY7C025AV-25AC Datasheet - Page 10

• Manufacturer Part Number: CY7C025AV-25AC
• Description: IC,SRAM,8KX16,CMOS,QFP,100PIN,PLASTIC
• Manufacturer: Cypress Semiconductor Corp

Document #: 38-06052 Rev. *H
Switching Characteristics
Data Retention Mode
The CY7C024AV/025AV/026AV and CY7C0241AV/0251AV/
036AV are designed with battery backup in mind. Data
retention voltage and supply current are guaranteed over
temperature. The following rules ensure data retention:
Notes:
24. For information on port-to-port delay through RAM cells from writing port to reading port, refer to Read Timing with Busy waveform.
25. Test conditions used are Load 2.
26. t
27. CE = V
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
1. Chip Enable (CE) must be held HIGH during data retention,
2. CE must be kept between V
3. The RAM can begin operation >t
SD
HD
HZWE
LZWE
WDD
DDD
BLA
BHA
BLC
BHC
PS
WB
WH
BDD
INS
INR
SOP
SWRD
SPS
SAA
Busy Timing
Interrupt Timing
Semaphore Timing
within V
during the power-up and power-down transitions.
minimum operating voltage (3.0V).
Parameter
[24]
[26]
BDD
[24]
[22, 23]
[22, 23]
is a calculated parameter and is the greater of t
CC
CC
, V
to V
in
[25]
= GND to V
CC
[25]
Data Set-up to Write End
Data Hold From Write End
R/W LOW to High Z
R/W HIGH to Low Z
Write Pulse to Data Delay
Write Data Valid to Read Data Valid
BUSY LOW from Address Match
BUSY HIGH from Address Mismatch
BUSY LOW from CE LOW
BUSY HIGH from CE HIGH
Port Set-up for Priority
R/W HIGH after BUSY (Slave)
R/W HIGH after BUSY HIGH (Slave)
BUSY HIGH to Data Valid
INT Set Time
INT Reset Time
SEM Flag Update Pulse (OE or SEM)
SEM Flag Write to Read Time
SEM Flag Contention Window
SEM Address Access Time
– 0.2V.
CC
, T
A
= 25°C. This parameter is guaranteed but not tested.
CC
– 0.2V and 70% of V
Over the Operating Range (continued)
RC
after V
Description
CC
WDD
reaches the
– t
PWE
(actual) or t
CC
DDD
Timing
V
CE
ICC
– t
CC
SD
Parameter
DR1
(actual).
[19]
Min.
15
15
10
5
5
5
0
3
0
CY7C0241AV/0251AV/036AV
CY7C0241AV/0251AV/036AV
CY7C024AV/025AV/026AV
-20
CY7C024AV/025AV/026AV
3.0V
@ VCC
Data Retention Mode
Max.
Test Conditions
12
45
30
20
20
20
17
20
20
20
20
V
CC
V
to V
CC
DR
> 2.0V
CC
= 2V
Min.
– 0.2V
15
17
12
5
5
5
0
0
0
-25
[27]
3.0V
Max.
15
50
35
20
20
20
17
25
20
20
25
Max.
Page 10 of 19
50
V
t
IH
RC
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Unit
μA