Datasheet

DS2148/DS21Q48
61 of 73
10 AC CHARACTERISTICS
Table 10-1. AC Characteristics—Multiplexed Parallel Port
(BIS1 = 0, BIS0 = 0)
(V
DD
= 5.0V ±5%, T
A
= -40°C to +85°C.) (See Figure 10-1, Figure 10-2, and Figure 10-3.)
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
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