Rainbow Electronics DS2151Q - Manual (Page 40)

ALE
WR
RD
CS
AD0-AD7
t
CYC
PW ASH
PW
EH
t
ASD
t
ASED
t ASL
t
DDR
t CH
t
DHR
t
ASD
t
CS
t
AHL
PW
EL
DS2151Q
022697 40/46
AC CHARACTERISTICS - PARALLEL PORT (0 ° C to 70 ° C; V
DD
=5V + 5%)
(–40
°
C to +85
°
C for DS2151QN)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Cycle Time t
CYC
250 ns
Pulse Width, DS Low or RD High PW
EL
150 ns
Pulse Width, DS High or RD Low PW
EH
100 ns
Input Rise/Fall Times t
R
, t
F
30 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
20 ns
Muxed Address Hold Time t
AHL
10 ns
Delay Time DS, WR or RD to AS
or ALE Rise t
ASD
25 ns
Pulse Width AS or ALE High PW
ASH
40 ns
Delay Time, AS or ALE to DS,
WR or RD t
ASED
20 ns
Output Data Delay Time from DS
or RD t
DDR
20 100 ns
Data Setup Time t
DSW
80 ns
INTEL BUS READ AC TIMING