DATA
0
1
0
1
0
0
1
1
1
1
0
t2
t1
t2
t1
IRTX
nIRTX
Parameter
min
typ
max
units
t1
t1
t1
t1
t1
t1
t1
t2
t2
t2
t2
t2
t2
t2
Pulse Width at 115kbaud
Pulse Width at 57.6kbaud
Pulse Width at 38.4kbaud
Pulse Width at 19.2kbaud
Pulse Width at 9.6kbaud
Pulse Width at 4.8kbaud
Pulse Width at 2.4kbaud
Bit Time at 115kbaud
Bit Time at 57.6kbaud
Bit Time at 38.4kbaud
Bit Time at 19.2kbaud
Bit Time at 9.6kbaud
1.41
1.41
1.41
1.41
1.41
1.41
1.41
1.6
2.71
3.69
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
3.22
4.8
5.53
9.7
11.07
22.13
44.27
88.55
19.5
39
78
8.68
17.4
26
52
104
208
416
Bit Time at 4.8kbaud
Bit Time at 2.4kbaud
Notes:
1. IrDA @ 115k is HPSIR compatible. IrDA @ 2400 will allow compatibility with HP95LX
and 48SX.
2. IRTX: CRC Bit 1: 1 = XMIT active low (default)
nIRTX: CRC Bit 1: 0 = XMIT active high
FIGURE 15 - IRDA SIR TRANSMIT TIMING
SMSC DS – FDC37N3869
Page 124
Rev. 10/25/2000
SMSC [ SMSC CORPORATION ]
