Cypress 7C185-25 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 Address Change
OHA
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
[9]
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 Write End
AW
t
Address Hold from Write End
HA
t
Address Set-up to Write Start
SA
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:
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
/I
and 30-pF load capacitance.
OL
OH
7.
t
t
, and t
are specified with C
HZOE,
HZCE
HZWE
8.
At any given temperature and voltage condition, t
9.
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.
Document #: 38-05043 Rev. *A
Over the Operating Range
Description
[7]
[8]
[7, 8]
[7]
= 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
[6]
7C185-15
7C185-20
Min.
Max.
Min.
Max.
15
20
15
20
3
5
15
20
15
20
8
3
3
7
3
5
3
3
7
0
0
15
20
15
20
12
15
12
15
12
15
0
0
0
0
12
15
8
10
0
0
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
7C185-25
7C185-35
Min.
Max.
Min.
25
35
25
5
5
25
25
9
12
3
3
8
10
5
5
3
3
8
10
0
0
20
25
35
20
20
20
20
20
25
0
0
0
0
15
20
10
12
0
0
7
7
5
5
CY7C185
Max.
Unit
ns
35
ns
ns
35
ns
35
ns
15
ns
ns
10
ns
ns
ns
10
ns
ns
20
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
8
ns
ns
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