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Switching Characteristics

Parameter
Read Cycle
t
RC
t
AA
t
OHA
t
ACE
t
DOE
t
LZOE
t
HZOE
t
LZCE
t
HZCE
t
PU
t
PD
t
DBE
[11]
t
LZBE
t
HZBE
[14]
Write Cycle
t
WC
t
SCE
t
AW
t
HA
t
SA
t
PWE
t
BW
t
SD
t
HD
t
HZWE
t
LZWE
Notes:
10. Test conditions assume signal transition time of 5 ns or less, timing reference levels of V
specified I
/I
and 30-pF load capacitance.
OL
OH
11. At any given temperature and voltage condition, t
given device.
12. t
, t
, t
, and t
transitions are measured when the outputs enter a high-impedance state.
HZOE
HZCE
HZBE
HZWE
13. When both byte enables are toggled together this value is 10 ns.
14. The internal Write time of the memory is defined by the overlap of WE, CE
Write and any of these signals can terminate a Write by going INACTIVE. The data input set-up and hold timing should be referenced to the edge of the signal
that terminates the Write.
Document #: 38-05014 Rev. *F
[10]
Over the Operating Range
Description
Read Cycle Time
Address to Data Valid
Data Hold from Address Change
CE
LOW and CE
HIGH to Data Valid
1
2
OE LOW to Data Valid
[11]
OE LOW to Low-Z
[11, 12]
OE HIGH to High-Z
CE
LOW and CE
HIGH to Low-Z
1
2
CE
HIGH or CE
LOW to High-Z
1
2
CE
LOW and CE
HIGH to Power-up
1
2
CE
HIGH or CE
LOW to Power-down
1
2
BHE/BLE LOW to Data Valid
[13]
BHE/BLE LOW to Low-Z
[11, 12]
BHE/BLE HIGH to High-Z
Write Cycle Time
CE
LOW and CE
HIGH to Write End
1
2
Address Set-up to Write End
Address Hold from Write End
Address Set-up to Write Start
WE Pulse Width
BHE/BLE Pulse Width
Data Set-up to Write End
Data Hold from Write End
[11, 12]
WE LOW to High-Z
[11]
WE HIGH to Low-Z
is less than t
, t
HZCE
LZCE
HZBE
= V
1
Min.
70
10
5
[11]
10
[11, 12]
0
5
70
60
60
0
0
50
60
30
0
5
/2, input pulse levels of 0 to V
CC(typ.)
is less than t
, t
is less than t
LZBE
HZOE
LZOE
, BHE and/or BLE = V
, CE
= V
. All signals must be ACTIVE to initiate a
IL
IL
2
IH
CY62157CV30/33
70 ns
Max.
Unit
ns
70
ns
ns
70
ns
35
ns
ns
25
ns
ns
25
ns
ns
70
ns
70
ns
ns
25
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
25
ns
ns
, and output loading of the
CC(typ.)
, and t
is less than t
for any
HZWE
LZWE
Page 6 of 13
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