CY7C421 CYPRESS [Cypress Semiconductor], CY7C421 Datasheet - Page 8

• Manufacturer Part Number: CY7C421
• Manufacturer: CYPRESS [Cypress Semiconductor]

Switching Characteristics
Over the Operating Range
Document Number: 38-06001 Rev. *H
Notes
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
6. Test conditions assume signal transition time of 3 ns or less, timing reference levels of 1.5 V and output loading of the specified I
7. t
8. t
RC
A
RR
PR
LZR
DVR
HZR
WC
PW
HWZ
WR
SD
HD
MRSC
PMR
RMR
RPW
WPW
RTC
PRT
RTR
EFL
HFH
FFH
REF
RFF
WEF
WFF
WHF
RHF
RAE
RPE
WAF
WPF
XOL
XOH
Parameter
as in part (a) of
100 mV from the steady state.
HZR
HZR
[7]
[7, 8]
[7, 8]
[7]
transition is measured at +200 mV from V
and t
DVR
[6]
use capacitance loading as in part (b) of
Figure 4 on page
Read Cycle Time
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 Setup 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
MR to EF LOW
MR to HF HIGH
MR to FF HIGH
Read LOW to EF LOW
Read HIGH to FF HIGH
Write HIGH to EF HIGH
Write LOW to FF LOW
Write LOW to HF LOW
Read HIGH to HF HIGH
Effective Read from Write HIGH
Effective Read Pulse Width after EF HIGH
Effective Write from Read HIGH
Effective Write Pulse Width after FF HIGH
Expansion Out LOW Delay from Clock
Expansion Out HIGH Delay from Clock
7, unless otherwise specified.
Description
OL
and –200 mV from V
Figure 4 on page
OH
7.
. t
DVR
transition is measured at the 1.5V level. t
Min
25
10
15
25
15
10
25
15
10
15
15
25
15
10
15
15
–
3
5
–
5
8
0
–
–
–
–
–
–
–
–
–
–
–
–
–
-15
Max
15
15
25
25
25
15
15
15
15
15
15
15
15
15
15
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
HWZ
and t
OL
Min
30
10
20
30
20
10
12
30
20
10
20
20
30
20
10
20
20
/I
–
3
5
–
5
0
–
–
–
–
–
–
–
–
–
–
–
–
–
LZR
OH
and 30 pF load capacitance,
transition is measured at
-20
CY7C421
Max
20
15
30
30
30
20
20
20
20
20
20
20
20
20
20
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
Page 8 of 21
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns