1200/2400/4800bps MSK Modem
7
MX469
4. General Description
4.1 Timing
4.1.1 1200bps
Characteristics
Note
Min.
Typ.
Max.
Unit
TX Enable to TX Sync Rise Time
tSYNC
tESET
tDSET
tDH
416
µs
TX Delay, Signal to Disable Time
Data Set-Up Time
2.0
2.0
2.0
800
µs
µs
µs
µs
µs
µs
1
Data Hold Time
TX Delay to O/P Time
TX Data Rate Period
RX Data Rate Period
tTXD
tTDR
tRDR
1.2
833
800
865
2.0
Undetermined State
Internal RX Delay
µs
tID
1.5
ms
Notes:
1. Consider the Xtal/clock tolerance.
2. All TX timings are related to the TX Sync Output.
t SYNC
tESET
TX
ENABLE
TX
SYNC
t DH
tTDR
tTDR
tDSET
DC
DV
=
=
Don't Care
Data Valid
TX DATA
DC
DC
DV
DC
DV
DC
DV
tTXD
OPEN CIRCUIT
OPEN CIRCUIT
1200 BPS
TX OUTPUT
Figure 3: Transmitter Timing: 1200bps
LOGIC '0'
LOGIC '1'
RX
SIGNAL I/P
1200 BPS
tID
1
RX
SYNC O/P
(1200Hz)
0
1
Undetermined
State
t RDR
CLOCKED
DATA O/P
LOGIC '1'
LOGIC '0'
0
Figure 4: Receiver Timing Diagram: 1200bps
ꢀ1998 MX-COM, Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480081.010
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