Datasheet

DS21352/DS21552
124 of 137
24. AC TIMING PARAMETERS AND DIAGRAMS
24.1 MULTIPLEXED BUS AC CHARACTERISTICS
AC CHARACTERISTICS –
MULTIPLEXED PARALLEL PORT
(MUX = 1)
[See Figure 24-1 to Figure 24-3]
(0°C to 70°C; V
DD
= 3.3V ± 5% for DS21352L;
0°C to 70°C; V
DD
= 5.0V ± 5% for DS21552L;
-40°C to +85°C; V
DD
= 3.3V ± 5% for DS21352LN;
-40°C to +85°C; V
DD
= 5.0V ± 5% for DS21552LN)
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* Set Up time before DS
high
t
RWS
50 ns
CS* Set Up time before DS,
WR* or RD* active
t
CS
20 ns
CS* Hold time t
CH
0ns
Read Data Hold time t
DHR
10 50 ns
Write Data Hold time t
DHW
0ns
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
20 80 ns
Data Set Up time t
DSW
50 ns