Ac timing parameters and diagrams – Maxim Integrated DS21Q55 User Manual
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34. AC TIMING PARAMETERS AND DIAGRAMS
Capacitive test loads are 40pF for bus signals, 20pF for all others.
34.1 Multipexed Bus AC Characteristics
AC CHARACTERISTICS–MULTIPLEXED PARALLEL PORT (MUX = 1)
(0
°
C to +70
°
C; V
DD
= 3.3V
±
5% for DS21Q55;
-40
°
C to +85
°
C; V
DD
= 3.3V
±
5% for DS21Q55N)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
Cycle Time
T
CYC
200
ns
Pulse Width, DS Low or RD*
High
PW
EL
100
ns
Pulse Width, DS High or RD*
Low
PW
EH
100
ns
Input Rise/Fall Times
T
R
, t
F
20
ns
R/W* Hold Time
T
RWH
10
ns
R/W* Setup Time Before DS
High
T
RWS
50
ns
CS* Setup Time Before DS,
WR* or RD* Active
t
CS
20
ns
CS* Hold Time
t
CH
0
ns
Read Data Hold Time
T
DHR
10
50
ns
Write Data Hold Time
T
DHW
5
ns
Muxed Address Valid to AS or
ALE Fall
T
ASL
15
ns
Muxed Address Hold Time
T
AHL
10
ns
Delay Time DS, WR*, or RD*
to AS or ALE Rise
T
ASD
20
ns
Pulse Width AS or ALE High
PW
ASH
30
ns
Delay Time, AS or ALE to DS,
WR* or RD*
T
ASED
10
ns
Output Data Delay Time from
DS or RD*
T
DDR
80
ns
Data Setup Time
T
DSW
50
ns
See Figures 37-1 to 37-3