CY7C419/21/25/29/33
Switching Characteristics
Over the Operating Range
[6, 7]
7C419–10
7C421–10
7C425–10
7C429–10
7C433–10
Parameter
t
RC
t
A
t
RR
t
PR
t
LZR[5,8]
t
DVR[8,9]
t
HZR[5,8,9]
t
WC
t
PW
t
HWZ[5,8]
t
WR
t
SD
t
HD
t
MRSC
t
PMR
t
RMR
t
RPW
t
WPW
t
RTC
t
PRT
t
RTR
Access Time
Read Recovery Time
Read Pulse Width
Read LOW to Low Z
Data Valid After Read HIGH
Read HIGH to High Z
Write Cycle Time
Write Pulse Width
Write HIGH to Low Z
Write Recovery Time
Data Set-Up Time
Data Hold Time
MR Cycle Time
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
20
10
5
10
6
0
20
10
10
10
10
20
10
10
10
10
3
5
15
25
15
5
10
8
0
25
15
10
15
15
25
15
10
Description
Read Cycle Time
Min.
20
10
10
15
3
5
15
30
20
5
10
12
0
30
20
10
20
20
30
20
10
Max.
7C419–15
7C421–15
7C425–15
7C429–15
7C433–15
Min.
25
15
10
20
3
5
15
35
25
5
10
15
0
35
25
10
25
25
35
25
10
Max.
7C420–20
7C421–20
7C424–20
7C425–20
7C428–20
7C429–20
7C433–20
Min.
30
20
10
25
3
5
18
Max.
7C420–25
7C421–25
7C424–25
7C425–25
7C429–25
7C432–25
7C433–25
Min.
35
25
Max.
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Notes:
6. Test conditions assume signal transition time of 3 ns or less, timing reference levels of 1.5V and output loading of the specified I
OL
/I
OH
and 30 pF load
capacitance, as in part (a) of AC Test Load and Waveforms, unless otherwise specified.
7. See the last page of this specification for Group A subgroup testing information.
8. t
HZR
transition is measured at +200 mV from V
OL
and –200 mV from V
OH
. t
DVR
transition is measured at the 1.5V level. t
HWZ
and t
LZR
transition is measured
at
±
100 mV from the steady state.
9. t
HZR
and t
DVR
use capacitance loading as in part (b) of AC Test Load and Waveforms.
Document #: 38-06001 Rev. **
Page 5 of 22
ETC [ ETC ]
