DS2154
AC CHARACTERISTICS -
MULTIPLEXED PARALLEL
PORT (MUX=1)
(0°C to 70°C; VDD=5V ±=5% for DS2154L;
-40°C to +85°C; VDD=5V ±=5% for DS2154LN)
PARAMETER
SYMBOL MIN
TYP
MAX
UNITS NOTES
Cycle Time
tCYC
PWEL
PWEH
tR, tF
tRWH
tRWS
200
100
100
ns
ns
ns
ns
ns
ns
ns
Pulse Width, DS low or RD high
Pulse Width, DS high or RD low
Input Rise/Fall times
20
10
50
20
R/ W Hold Times
R/ W Set Up time before DS high
tCS
CS Set Up time before DS, WR , or RD
active
tCH
tDHR
tDHW
tASL
tAHL
tASD
0
ns
ns
ns
ns
ns
ns
CS Hold Time
Read Data Hold time
10
0
50
Write Data Hold time
Muxed Address valid to AS or ALE fall
Muxed Address Hold time
15
10
20
Delay time DS, WR or RD to AS or
ALE rise
Pulse Width AS or ALE high
PWASH
tASED
30
10
ns
ns
Delay time, AS or ALE to DS, WR or
RD
Output Data Delay time from DS or RD
tDDR
tDSW
20
50
80
ns
ns
Data Set Up time
See Figures 14-1 to 14-3 for details.
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DALLAS [ DALLAS SEMICONDUCTOR ]
