SAE 81C90/91
07Feb95@09:05h Intermediate Version
Figure 12
SI-Write-Timing
AC Characteristics (PI Timing)
V
CC = 5 V ± 10 %;
VSS = 0 V
CL = 50 pF
TA = – 40 to + 110 ˚C;
Parameter
Symbol
Limit Values
max.
Unit Test Condition
min.
Read-Cycle time
tCYR DC 4 tOSC
tCYW DC 4 tOSC
tLHLL DC 30
tAVLL SR 10
tLLAX SR 10
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Write-Cycle time
ALE pulse width
Address setup to ALE low
Address hold after ALE low
RD pulse width
tRLRH SR 2 tOSC + 30
tWLWH SR 2 tOSC + 30
WR pulse width
ALE low to WR active
ALE low to RD active
Data float after RD high
RD low to data valid
Data setup before WR high
Data hold after WR high
CS low to RD low
tLLWL SR 20
tLLRL SR 20
tRFDX DC 0
tRLDV DC
20
2 tOSC + 20 ns
tDVWH SR 10
tWHDX SR 5
tCLRL / SR 0
tCLWL SR 0
tWHLL SR 1.5 tOSC
ns
ns
ns
ns
ns
CS low to WR low
WR high to next ALE low
Semiconductor Group
39
INFINEON [ Infineon ]
