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CHAPTER 7 APPLICATION NOTES
Introduction
This chapter includes AC electrical characteristics and timing information.
AC Electrical Characteristics
AC electrical characteristics appear in
Timing Characteristics
Table 7-1
Symbol
Figure
General Characteristics
t
Figure 7-1
f
t
Figure 7-1
r
Serial I/O Timing, Host Transmit
t
Figure 7-2
rlcl
t
Figure 7-2
clxl
t
Figure 7-2
xlxl
t
Figure 7-2
rhrh
Notes:
1. If byte to byte delay exceeds the maximum specified time, a transmission error is declared. The
sender is expected to retransmit the packet in its entirety.
2. The host may hold the Host RTS* low indefinitely, but it locks out the SE955 from transmitting.
3. The decoder may transmit any time the Host RTS* is high.
4. The host should release its Host RTS* as soon as possible after transmitting so the decoder can
process the message.
5. The SE955's micro-controller is in full operation whenever the PWRDWN line is driven low.
6. See the Power Management on page 1-4 if trigger is not pulled after the maximum specified amount
of time.
7. In addition, see Parameter # 0x88 on page 8-10 and Parameter # 0x8A on page 8-13.
Table
7-1. All output lines are measured with 10K pull-up.
Parameter
High-to-Low fall time, all outputs, C
Low-to-High rise time, all outputs, C
Request to Send low to Clear to Send low
Clear to Send low to first start bit
Byte to byte delay, (see Note 1)
End of the packet to RTS* high
Min
= 50 pf
L
= 50 pf
L
0
Max
Unit
1.0
µsec
1.0
µsec
25
msec
Note 2
990
msec
Note 4
msec
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