CY62256LL-70SNC(2004) Просмотр технического описания (PDF) - Cypress Semiconductor
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CY62256LL-70SNC Datasheet PDF : 12 Pages
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Switching Characteristics Over the Operating Range[7]
Parameter
Read Cycle
tRC
tAA
tOHA
tACE
tDOE
tLZOE
tHZOE
tLZCE
tHZCE
tPU
tPD
Write Cycle[10, 11]
tWC
tSCE
tAW
tHA
tSA
tPWE
tSD
tHD
tHZWE
tLZWE
Description
Read Cycle Time
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
Write Cycle Time
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
Data Set-up to Write End
Data Hold from Write End
WE LOW to High-Z[8, 9]
WE HIGH to Low-Z[8]
Switching Waveforms
Read Cycle No. 1[12, 13]
tRC
ADDRESS
DATA OUT
tAA
tOHA
PREVIOUS DATA VALID
CY62256
CY62256−55
CY62256−70
Min.
Max.
Min.
Max.
Unit
55
70
ns
55
70
ns
5
5
ns
55
70
ns
25
35
ns
5
5
ns
20
25
ns
5
5
ns
20
25
ns
0
0
ns
55
70
ns
55
70
ns
45
60
ns
45
60
ns
0
0
ns
0
0
ns
40
50
ns
25
30
ns
0
0
ns
20
25
ns
5
5
ns
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
IOL/IOH and 100-pF load capacitance.
8. At any given temperature and voltage condition, tHZCE is less than tLZCE, tHZOE is less than tLZOE, and tHZWE is less than tLZWE for any given device.
9. tHZOE, tHZCE, and tHZWE are specified with CL = 5 pF as in (b) of AC Test Loads. Transition is measured ±500 mV from steady-state voltage.
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 tHZWE and tSD
12. Device is continuously selected. OE, CE = VIL.
13. WE is HIGH for Read cycle.
Document #: 38-05248 Rev. *C
Page 5 of 12
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