Cypress Semiconductor CY7C027V Ficha de especificações - Página 7

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Cypress Semiconductor CY7C027V Ficha de especificações
3.3V
R1 = 590Ω
OUTPUT
C = 30 pF
R2 = 435Ω
(a) Normal Load (Load 1)

Switching Characteristics

Parameter
Read Cycle
t
Read Cycle Time
RC
t
Address to Data Valid
AA
t
Output Hold From Address Change
OHA
[7]
t
CE LOW to Data Valid
ACE
t
OE LOW to Data Valid
DOE
[8, 9, 10]
t
OE LOW to Low Z
LZOE
[8, 9, 10]
t
OE HIGH to High Z
HZOE
[8, 9, 10]
t
CE LOW to Low Z
LZCE
[8, 9, 10]
t
CE HIGH to High Z
HZCE
[10]
t
CE LOW to Power Up
PU
[10]
t
CE HIGH to Power Down
PD
[7]
t
Byte Enable Access Time
ABE
Write Cycle
t
Write Cycle Time
WC
[7]
t
CE LOW to Write End
SCE
t
Address Valid to Write End
AW
t
Address Hold From Write End
HA
[7]
t
Address Setup to Write Start
SA
t
Write Pulse Width
PWE
t
Data Setup to Write End
SD
Notes
6. 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
and 30 pF load capacitance.
7. To access RAM, CE=L, UB=L, SEM=H. To access semaphore, CE=H and SEM=L. Either condition must be valid for the entire t
8. At any given temperature and voltage condition for any given device, t
9. Test conditions used are Load 2.
10. This parameter is guaranteed by design, but it is not production tested. For information on port-to-port delay through RAM cells from writing port to reading port,
refer to
Figure
11.
Document #: 38-06078 Rev. *B
Figure 3. AC Test Loads and Waveforms
R
TH
OUTPUT
C = 30 pF
(b) Thévenin Equivalent (Load 1)
ALL INPUT PULSES
3.0V
90%
10%
GND
≤
3 ns
[6]
Over the Operating Range
Description
is less than t
HZCE
CY7C027V/027VN/027AV/028V
CY7C037V/037AV/038V
= 250Ω
OUTPUT
C = 5 pF
V
= 1.4V
TH
(c) Three-State Delay (Load 2)
(Used for t
90%
10%
≤
3 ns
CY7C027V/027VN/027AV/028V/
CY7C037V/037AV/038V
-15
-20
Min
Max
Min
15
20
15
3
3
15
10
3
3
10
3
3
10
0
0
15
15
15
20
12
16
12
16
0
0
0
0
12
17
10
12
and t
is less than t
LZCE
HZOE
LZOE
3.3V
R1 = 590Ω
R2 = 435Ω
, t
, t
, & t
LZ
HZ
HZWE
LZWE
including scope and jig)
-25
Max
Min
Max
25
20
25
3
20
25
12
13
3
12
15
3
12
15
0
20
25
20
25
25
20
20
0
0
22
15
time.
SCE
.
Page 7 of 18
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
/I
OI
OH
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