CY7C185
Switching Characteristics
Over the Operating Range
[6]
7C185-15
Parameter
Read Cycle
t
RC
t
AA
t
OHA
t
ACE1
t
ACE2
t
DOE
t
LZOE
t
HZOE
t
LZCE1
t
LZCE2
t
HZCE
t
PU
t
PD
Write Cycle
[9]
t
WC
t
SCE1
t
SCE2
t
AW
t
HA
t
SA
t
PWE
t
SD
t
HD
t
HZWE
t
LZWE
Write Cycle Time
CE
1
LOW to Write End
CE
2
HIGH to Write End
Address Set-up to Write End
Address Hold from Write End
Address Set-up to Write Start
WE Pulse Width
Data Set-up to Write End
Data Hold from Write End
WE LOW to High Z
[7]
WE HIGH to Low Z
3
15
12
12
12
0
0
12
8
0
7
5
20
15
15
15
0
0
15
10
0
7
5
25
20
20
20
0
0
15
10
0
7
5
35
20
20
25
0
0
20
12
0
8
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Read Cycle Time
Address to Data Valid
Data Hold from Address Change
CE
1
LOW to Data Valid
CE
2
HIGH to Data Valid
OE LOW to Data Valid
OE LOW to Low Z
OE HIGH to High Z
[7]
CE
1
LOW to Low Z
[8]
CE
2
HIGH to Low Z
CE
1
HIGH to High Z
[7, 8]
CE
2
LOW to High Z
CE
1
LOW to Power-Up
CE
2
to HIGH to Power-Up
CE
1
HIGH to Power-Down
CE
2
LOW to Power-Down
0
15
3
3
7
0
20
3
7
5
3
8
0
20
3
15
15
8
3
8
5
3
10
0
20
15
15
5
20
20
9
3
10
5
3
10
20
20
5
25
25
12
3
10
25
25
5
35
35
15
35
35
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Description
Min.
Max.
7C185-20
Min.
Max.
7C185-25
Min.
Max.
7C185-35
Min.
Max.
Unit
Notes:
6. Test conditions assume signal transition time of 5 ns or less, timing reference levels of 1.5V, input pulse levels of 0 to 3.0V, and output loading of the specified
I
OL
/I
OH
and 30-pF load capacitance.
7. t
HZOE,
t
HZCE
, and t
HZWE
are specified with C
L
= 5 pF as in part (b) of AC Test Loads. Transition is measured
±500
mV from steady state voltage.
8. At any given temperature and voltage condition, t
HZCE
is less than t
LZCE1
and t
LZCE2
for any given device.
9. The internal write time of the memory is defined by the overlap of CE
1
LOW, CE
2
HIGH, and WE LOW. All 3 signals must be active to initiate a write and either
signal can terminate a write by going HIGH. The data input set-up and hold timing should be referenced to the rising edge of the signal that terminates the write.
Document #: 38-05043 Rev. *A
Page 4 of 11
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