X88C75 Datasheet, PDF (20/27 Pages) Xicor Inc. – Port Expander and E2 Memory

X88C75 SLIC^® E²
Port Read Diagram
STRA/STRB* (IN)
PA7:0/PB7:0
IRQ
ALE
1
2
3
DATA VALID
4
5
INTERRUPT
RECOGNIZED
6
89
A15–A8
PORT
ADDRESS
10
RD/PSEN
8
9
AD7–AD0
A7-A0
NOTE: *Figure shows active HIGH strobes.
7
11
DATA
VALID
2887 ILL F26.1
PORT READ TIMING
No. Symbol
Parameter
1 t_SVSX Strobe Pulse Width
2
t_DVSV Data Port Setup
3 t_SVDX Data Port Hold Time
4
t_SVIV
Interrupt Request to Strobe
5
t_IAD
IRQ to ALE
6
t_LHLL
ALE Pulse Width
7
t_RXIX
RD to IRQ
8 t_AVLL Address setup time
9 t_LLAX Address hold time
10 t_LLWL ALE to RD LOW
11 t_RLDV RD Access Time
Min.
80
20
30
0
80
30
20
30
30
Max.
50
120
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
2887 PGM T13.2
20