Datasheet

DS21354/DS21554 3.3V/5V E1 Single-Chip Transceivers
112 of 124
20. AC TIMING PARAMETERS AND DIAGRAMS
20.1. Multiplexed Bus AC Characteristics
AC CHARACTERISTICS—MULTIPLEXED PARALLEL PORT (MUX = 1)
(V
DD
= 3.3V ±5%, T
A
= 0°C to +70°C; for DS21354L; V
DD
= 5.0V ±5%, T
A
= 0°C to +70°C for DS21554L;
V
DD
= 3.3V ±5%, T
A
= -40°C to +85°C for DS21354LN; V
DD
= 5.0V ±5%, T
A
= -40°C to +85°C for DS21554LN.)
(See Figure 20-1
to Figure 20-3.)
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 Yimes
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