Rainbow Electronics DS21458 - Manual (Page 253)

DS21455/DS21458 Quad T1/E1/J1 Transceivers
253 of 270
38. AC TIMING PARAMETERS AND DIAGRAMS
Capacitive test loads are 40pF for bus signals, 20pF for all others.
38.1 Multiplexed Bus AC Characteristics
AC CHARACTERISTICS–MULTIPLEXED PARALLEL PORT (MUX = 1)
(V
DD
= 3.3V ±5%, T
A
= 0°C to +70°C for DS21455/DS21458;
V
DD
= 3.3V ±5%, T
A
= -40 °C to +85°C for DS21455N/DS21458N.) (See Figure 38-1 to Figure 38-3 .)
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
5 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
80 ns
Data Setup Time t
DSW
50 ns