Cypress Semiconductor CY7C185 Hoja de especificaciones - Página 4
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Switching Characteristics
Parameter
READ CYCLE
t
Read Cycle Time
RC
t
Address to Data Valid
AA
t
Data Hold from
OHA
Address Change
t
CE
LOW to Data Valid
ACE1
1
t
CE
HIGH to Data Valid
ACE2
2
t
OE LOW to Data Valid
DOE
t
OE LOW to Low Z
LZOE
t
OE HIGH to High Z
HZOE
t
CE
LOW to Low Z
LZCE1
1
t
CE
HIGH to Low Z
LZCE2
2
t
CE
HIGH to High Z
HZCE
1
CE
LOW to High Z
2
t
CE
LOW to Power-Up
PU
1
CE
to HIGH to Power-Up
2
t
CE
HIGH to Power-Down
PD
1
CE
LOW to Power-Down
2
[8]
WRITE CYCLE
t
Write Cycle Time
WC
t
CE
LOW to Write End
SCE1
1
t
CE
HIGH to Write End
SCE2
2
t
Address Set-Up to
AW
Write End
t
Address Hold from
HA
Write End
t
Address Set-Up to
SA
Write Start
t
WE Pulse Width
PWE
t
Data Set-Up to Write End
SD
t
Data Hold from Write End
HD
t
WE LOW to High Z
HZWE
t
WE HIGH to Low Z
LZWE
Notes:
5.
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
/I
and 30-pF load capacitance.
OL
OH
6.
t
t
, and t
are specified with C
HZOE,
HZCE
HZWE
7.
At any given temperature and voltage condition, t
8.
The internal write time of the memory is defined by the overlap of CE
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.
Over the Operating Range
Description
Min.
[6]
[7]
[6, 7]
[6]
= 5 pF as in part (b) of AC Test Loads. Transition is measured 500 mV from steady state voltage.
L
is less than t
HZCE
[5]
7C185–15
7C185–20
Max.
Min.
Max.
15
20
15
20
3
5
15
20
15
20
8
9
3
3
7
8
3
5
3
3
7
8
0
0
15
20
15
20
12
15
12
15
12
15
0
0
0
0
12
15
8
10
0
0
7
7
3
5
and t
for any given device.
LZCE1
LZCE2
LOW, CE
HIGH, and WE LOW. All 3 signals must be active to initiate a write and either
1
2
4
CY7C185
7C185–25
7C185–35
Min.
Max.
Min.
Max.
25
35
25
35
5
5
25
35
25
35
12
15
3
3
10
10
5
5
3
3
10
10
0
0
20
20
25
35
20
20
20
20
20
25
0
0
0
0
15
20
10
12
0
0
7
8
5
5
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns