Cypress Semiconductor CY7C107B Технический паспорт - Страница 4

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AC Test Loads and Waveforms
R1 480
5V
OUTPUT
R2
30 pF
255
INCLUDING
JIG AND
SCOPE
(a)
Equivalent to:
THÉ VENIN EQUIVALENT
167
OUTPUT
Switching Characteristics
Parameter
Description
READ CYCLE
t
Read Cycle Time
RC
t
Address to Data Valid
AA
t
Data Hold from Address
OHA
Change
t
CE LOW to Data Valid
ACE
t
CE LOW to Low Z
LZCE
t
CE HIGH to High Z
HZCE
t
CE LOW to Power-Up
PU
t
CE HIGH to Power-Down
PD
[8]
WRITE CYCLE
t
Write Cycle Time
WC
t
CE LOW to Write End
SCE
t
Address Set-Up to Write
AW
End
t
Address Hold from Write
HA
End
t
Address Set-Up to Write
SA
Start
t
WE Pulse Width
PWE
t
Data Set-Up to Write End
SD
t
Data Hold from Write End
HD
t
WE HIGH to Low Z
LZWE
t
WE LOW to High Z
HZWE
Notes:
5.
Test conditions assume signal transition time of 3 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.
At any given temperature and voltage condition, t
7.
t
and t
are specified with a load capacitance of 5 pF as in part (b) of AC Test Loads. Transition is measured 500 mV from steady-state voltage.
HZCE
HZWE
8.
The internal write time of the memory is defined by the overlap of CE LOW and WE LOW. CE and WE must be LOW to initiate a write, and the transition of any of these
signals can terminate the write. The input data set-up and hold timing should be referenced to the leading edge of the signal that terminates the write.
Document #: 38-05030 Rev. **
R1 480
5V
OUTPUT
R2
5 pF
255
INCLUDING
JIG AND
SCOPE
(b)
107-3
1.73V
[5]
Over the Operating Range
7C107B-12
7C107B-15
7C1007B-12
7C1007B-15
Min.
Max.
Min.
12
15
12
3
3
12
[6]
3
3
[6, 7]
6
0
0
12
12
15
10
12
10
12
0
0
0
0
10
12
7
8
0
0
[6]
3
3
[6, 7]
6
is less than t
and t
HZCE
LZCE
3.0V
10%
GND
3 ns
7C107B-20
7C107B-25
7C1007B-20
7C1007B-25
Max.
Min.
Max.
Min.
20
25
15
20
3
3
15
20
3
3
7
8
0
0
15
20
20
25
15
20
15
20
0
0
0
0
15
20
10
15
0
0
3
3
7
8
is less than t
for any given device.
HZWE
LZWE
CY7C107B
CY7C1007B
ALL INPUT PULSES
90%
90%
10%
3 ns
107-4
7C107B-35
7C1007B-35
Max.
Min.
Max.
Unit
35
ns
25
35
ns
3
ns
25
35
ns
3
ns
10
10
ns
0
ns
25
35
ns
35
ns
25
ns
25
ns
0
ns
0
ns
25
ns
20
ns
0
ns
3
ns
10
10
ns
Page 4 of 9
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