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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