CY7C419/21/25/29/33
Switching Characteristics Over the Operating Range[7, 8]
7C419–10
7C419–15
7C421–15
7C425–15
7C429–15
7C433–15
7C420–20
7C421–20
7C424–20
7C425–20
7C428–20
7C429–20
7C420–25
7C421–25
7C424–25
7C425–25
7C421–10
7C425–10
7C429–10
7C433–10
7C429–25
7C432–25
7C433–25
7C433–20
Parameter
Description
Read Cycle Time
Min. Max. Min. Max. Min. Max. Min. Max. Unit
tRC
tA
tRR
tPR
20
25
30
35
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Access Time
10
15
20
15
25
Read Recovery Time
Read Pulse Width
10
10
3
10
15
3
10
20
3
10
25
3
[6,9]
tLZR
Read LOW to Low Z
Data Valid After Read HIGH
Read HIGH to High Z
Write Cycle Time
[9,10]
tDVR
5
5
5
5
[6,9,10]
tHZR
15
15
18
tWC
tPW
20
10
5
25
15
5
30
20
5
35
25
5
Write Pulse Width
[6,9]
tHWZ
Write HIGH to Low Z
Write Recovery Time
Data Set-Up Time
tWR
10
6
10
8
10
12
0
10
15
0
tSD
tHD
Data Hold Time
0
0
tMRSC
tPMR
tRMR
tRPW
tWPW
tRTC
tPRT
MR Cycle Time
20
10
10
10
10
20
10
10
25
15
10
15
15
25
15
10
30
20
10
20
20
30
20
10
35
25
10
25
25
35
25
10
MR Pulse Width
MR Recovery Time
Read HIGH to MR HIGH
Write HIGH to MR HIGH
Retransmit Cycle Time
Retransmit Pulse Width
Retransmit Recovery Time
tRTR
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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