Serial Port Timing
nIOW
t1
nRTSx,
nDTRx
t5
IRQx
nCTSx,
nDSRx,
nDCDx
t6
t2
t4
IRQx
nIOW
t3
IRQx
nIOR
nRIx
Parameter
min
typ
max
units
t1
t2
nRTSx, nDTRx Delay from nIOW
200
100
ns
ns
IRQx Active Delay from nCTSx, nDSRx,
nDCDx
t3
t4
IRQx Inactive Delay from nIOR (Leading
Edge)
IRQx Inactive Delay from nIOW (Trailing
Edge)
IRQx Inactive Delay from nIOW
IRQx Active Delay from nRIx
120
125
ns
ns
t5
t6
10
100
100
ns
ns
FIGURE 13 - SERIAL PORT TIMING
SMSC DS – FDC37N3869
Page 122
Rev. 10/25/2000