User Manual

DS2172
031197 15/20
AC CHARACTERISTICS – PARALLEL PORT (0°C to 70°C; V
DD
=5V ± 10%)
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 T imes t
R
, t
F
20 ns
R/W Hold T ime t
RWH
10 ns
R/W Setup T ime Before DS High t
RWS
50 ns
CS Setup T ime Before DS, WR or
RD
Active
t
CS
20 ns
CS Hold T ime t
CH
0 ns
Read Data Hold T ime t
DHR
5 50 ns
Write Data Hold Time t
DHW
0 ns
Mux’ed Address Valid to AS or
ALE Fall
t
ASL
15 ns
Mux’ed Address Hold T ime t
AHL
10 ns
Delay T ime DS, WR or RD to AS
or ALE Rise
t
ASD
20 ns
Pulse Width AS or ALE High PW
ASH
30 ns
Delay T ime, AS or ALE to DS,
WR
or RD
t
ASED
10 ns
Output Data Delay T ime from DS
or RD
t
DDR
5 50 ns
Data Setup T ime t
DSW
50 ns