CY7C008/009
CY7C018/019
Document #: 38-06041 Rev. *D
Page 8 of 19
Data Retention Mode
The CY7C008/009 and CY7C018/019 are designed with
battery backup in mind. Data retention voltage and supply
current are guaranteed over temperature. The following rules
ensure data retention:
1. Chip Enable (CE) must be held HIGH during data retention,
within VCC to VCC – 0.2V.
2. CE must be kept between VCC – 0.2V and 70% of VCC
during the power-up and power-down transitions.
3. The RAM can begin operation >tRC after VCC reaches the
minimum operating voltage (4.5 volts).
Notes:
19. Test conditions used are Load 1.
20. tBDD is a calculated parameter and is the greater of tWDD–tPWE (actual) or tDDD–tSD (actual).
21. CE = VCC, Vin = GND to VCC, TA = 25°C. This parameter is guaranteed but not tested.
BUSY TIMING[19]
tBLA
BUSY LOW from Address Match
12
15
20
ns
tBHA
BUSY HIGH from Address Mismatch
12
15
20
ns
tBLC
BUSY LOW from CE LOW
12
15
20
ns
tBHC
BUSY HIGH from CE HIGH
12
15
17
ns
tPS
Port Set-Up for Priority
5
5
5
ns
tWB
R/W HIGH after BUSY (Slave)
0
0
0
ns
tWH
R/W HIGH after BUSY HIGH (Slave)
11
13
15
ns
tBDD[20]
BUSY HIGH to Data Valid
12
15
20
ns
INTERRUPT TIMING[19]
tINS
INT Set Time
12
15
20
ns
tINR
INT Reset Time
12
15
20
ns
SEMAPHORE TIMING
tSOP
SEM Flag Update Pulse (OE or SEM)10
10
10
ns
tSWRD
SEM Flag Write to Read Time
5
5
5
ns
tSPS
SEM Flag Contention Window
5
5
5
ns
tSAA
SEM Address Access Time
12
15
20
ns
Switching Characteristics Over the Operating Range[13] (continued)
Parameter
Description
CY7C008/009
CY7C018/019
Unit
-12[1]
-15
-20
Min.
Max.
Min.
Max.
Min.
Max.
Timing
Parameter
Test Conditions[21]
Max.
Unit
ICCDR1
@ VCCDR = 2V
1.5
mA
Data Retention Mode
4.5V
4.5V
VCC > 2.0V
VCC to VCC – 0.2V
VCC
CE
tRC
V
IH
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