Cypress Semiconductor CY7C138 Arkusz specyfikacji - Strona 6

Przeglądaj online lub pobierz pdf Arkusz specyfikacji dla Sprzęt komputerowy Cypress Semiconductor CY7C138. Cypress Semiconductor CY7C138 18 stron. 4k x 8/9 dual-port static ram with sem, int, busy

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Switching Characteristics
Parameter
Description
t
Data Hold From Write End
HD
[11,12]
t
R/W LOW to High Z
HZWE
[11,12]
t
R/W HIGH to Low Z
LZWE
[13]
t
Write Pulse to Data Delay
WDD
[13]
t
Write Data Valid to Read Data Valid
DDD
[14]
BUSY TIMING
t
BUSY LOW from Address Match
BLA
t
BUSY HIGH from Address Mismatch
BHA
t
BUSY LOW from CE LOW
BLC
t
BUSY HIGH from CE HIGH
BHC
t
Port Set-Up for Priority
PS
t
R/W LOW after BUSY LOW
WB
t
R/W HIGH after BUSY HIGH
WH
[15]
t
BUSY HIGH to Data Valid
BDD
[14]

INTERRUPT TIMING

t
INT Set Time
INS
t
INT Reset Time
INR
SEMAPHORE TIMING
t
SEM Flag Update Pulse (OE or SEM)
SOP
t
SEM Flag Write to Read Time
SWRD
t
SEM Flag Contention Window
SPS

Switching Waveforms

ADDRESS
DATA OUT
PREVIOUS DATA VALID
Notes
9. 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.
OI
OH
10. At any given temperature and voltage condition for any given device, t
11. Test conditions used are Load 3.
12. This parameter is guaranteed but not tested.
13. For information on part-to-part delay through RAM cells from writing port to reading port, refer to Read Timing with Port-to-Port Delay waveform.
14. Test conditions used are Load 2.
15. t
is a calculated parameter and is the greater of t
BDD
Document #: 38-06037 Rev. *D
Over the Operating Range
7C138-15
7C139-15
Min
0
3
5
0
13
10
5
5
Figure 3. Read Cycle No. 1 (Either Port Address Access)
t
AA
t
OHA
Figure 4. Read Cycle No. 2 (Either Port CE/OE Access)
HZCE
– t
(actual) or t
WDD
PWE
[9]
(continued)
7C138-25
7C138-35
7C139-25
7C139-35
Max
Min
Max
Min
0
0
10
15
3
3
30
50
25
30
15
20
15
20
15
20
15
20
5
5
0
0
20
30
Note 15
Note 15
15
25
15
25
10
15
5
5
5
5
t
RC
is less than t
and t
is less than t
LZCE
HZOE
– t
(actual).
DDD
SD
CY7C138, CY7C139
7C138-55
7C139-55
Max
Min
Max
0
20
25
3
60
70
35
40
20
45
20
40
20
40
20
35
5
0
40
Note 15
Note 15
25
30
25
30
20
5
5
[16, 17]
DATA VALID
[16, 18, 19]
.
LZOE
Page 6 of 17
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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