CY7C421(2002) 查看數據表（PDF） - Cypress Semiconductor
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CY7C421 Datasheet PDF : 22 Pages
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CY7C419/21/25/29/33
Switching Characteristics Over the Operating Range[7, 8]
7C419–10
7C421–10
7C425–10
7C429–10
7C433–10
7C419–15
7C421–15
7C425–15
7C429–15
7C433–15
7C420–20
7C421–20
7C424–20
7C425–20
7C428–20
7C429–20
7C433–20
7C420–25
7C421–25
7C424–25
7C425–25
7C429–25
7C432–25
7C433–25
Parameter
Description
Min. Max. Min. Max. Min. Max. Min. Max. Unit
tRC
Read Cycle Time
20
25
30
35
ns
tA
Access Time
10
15
20
25 ns
tRR
Read Recovery Time
10
10
10
10
ns
tPR
tLZR[6,9]
tDVR[9,10]
tHZR[6,9,10]
Read Pulse Width
Read LOW to Low Z
Data Valid After Read HIGH
Read HIGH to High Z
10
15
20
25
ns
3
3
3
3
ns
5
5
5
5
ns
15
15
15
18 ns
tWC
Write Cycle Time
20
25
30
35
ns
tPW
tHWZ[6,9]
Write Pulse Width
Write HIGH to Low Z
10
15
20
25
ns
5
5
5
5
ns
tWR
Write Recovery Time
10
10
10
10
ns
tSD
Data Set-Up Time
6
8
12
15
ns
tHD
Data Hold Time
0
0
0
0
ns
tMRSC
MR Cycle Time
20
25
30
35
ns
tPMR
MR Pulse Width
10
15
20
25
ns
tRMR
MR Recovery Time
10
10
10
10
ns
tRPW
Read HIGH to MR HIGH
10
15
20
25
ns
tWPW
Write HIGH to MR HIGH
10
15
20
25
ns
tRTC
Retransmit Cycle Time
20
25
30
35
ns
tPRT
Retransmit Pulse Width
10
15
20
25
ns
tRTR
Retransmit Recovery Time
10
10
10
10
ns
Notes:
7. Test conditions assume signal transition time of 3 ns or less, timing reference levels of 1.5V and output loading of the specified IOL/IOH and 30 pF load
capacitance, as in part (a) of AC Test Load and Waveforms, unless otherwise specified.
8. See the last page of this specification for Group A subgroup testing information.
9. tHZR transition is measured at +200 mV from VOL and –200 mV from VOH. tDVR transition is measured at the 1.5V level. tHWZ and tLZR transition is measured
at ±100 mV from the steady state.
10. tHZR and tDVR use capacitance loading as in part (b) of AC Test Load and Waveforms.
Document #: 38-06001 Rev. *A
Page 5 of 22
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