Datasheet

DS2155
224 of 238
37. AC TIMING PARAMETERS AND DIAGRAMS
Capacitive test loads are 40pF for bus signals, 20pF for all others.
37.1 Multiplexed Bus AC Characteristics
AC CHARACTERISTICS: MULTIPLEXED PARALLEL PORT (MUX = 1)
(Figure 37-1, Figure 37-2, and Figure 37-3)
(V
DD
= 3.3V ±5%, T
A
= 0°C to +70°C for DS2155L; V
DD
= 3.3V ±5%, T
A
= -40°C to +85°C for DS2155LN.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
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
0 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
20 80 ns
Data Setup Time t
DSW
50 ns