CY62256N
Switching Characteristics Over the Operating Range[7]
CY62256N-55
CY62256N-70
Min. Max.
Parameter
Read Cycle
tRC
Description
Min.
Max.
Unit
Read Cycle Time
55
5
70
5
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
tAA
Address to Data Valid
Data Hold from Address Change
CE LOW to Data Valid
OE LOW to Data Valid
OE LOW to Low-Z[8]
OE HIGH to High-Z[8, 9]
CE LOW to Low-Z[8]
CE HIGH to High-Z[8, 9]
CE LOW to Power-up
CE HIGH to Power-down
55
70
tOHA
tACE
55
25
70
35
tDOE
tLZOE
tHZOE
tLZCE
tHZCE
tPU
5
5
0
5
5
0
20
20
55
25
25
70
tPD
Write Cycle[10, 11]
tWC
Write Cycle Time
55
45
45
0
70
60
60
0
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
tSCE
tAW
CE LOW to Write End
Address Set-up to Write End
Address Hold from Write End
Address Set-up to Write Start
WE Pulse Width
tHA
tSA
0
0
tPWE
tSD
40
25
0
50
30
0
Data Set-up to Write End
Data Hold from Write End
WE LOW to High-Z[8, 9]
WE HIGH to Low-Z[8]
tHD
tHZWE
tLZWE
20
25
5
5
Switching Waveforms
Read Cycle No. 1[12, 13]
t
RC
ADDRESS
t
AA
t
OHA
DATA OUT
PREVIOUS DATA VALID
DATA VALID
Notes:
7. 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 and 100-pF load capacitance.
I
OL OH
8. At any given temperature and voltage condition, t
is less than t
, t
is less than t
, and t
is less than t
for any given device.
HZCE
LZCE HZOE
LZOE
HZWE
LZWE
9. t
, t
, and t
are specified with C = 5 pF as in (b) of AC Test Loads. Transition is measured ±500 mV from steady-state voltage.
HZOE HZCE
HZWE L
10. The internal Write time of the memory is defined by the overlap of CE LOW and WE LOW. Both signals must be LOW to initiate a Write and either 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.
11. The minimum Write cycle time for Write Cycle #3 (WE controlled, OE LOW) is the sum of t
and t
.
SD
HZWE
12. Device is continuously selected. OE, CE = V
13. WE is HIGH for Read cycle.
.
IL
Document #: 001-06511 Rev. *A
Page 5 of 13
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