1200/2400/4800bps MSK Modem
7
MX469
4. General Description
4.1 Timing
4.1.1 1200bps
Characteristics
TX Enable to TX Sync Rise Time
TX Delay, Signal to Disable Time
Data Set-Up Time
Data Hold Time
TX Delay to O/P Time
TX Data Rate Period
RX Data Rate Period
Undetermined State
Internal RX Delay
t
ID
1.5
t
SYNC
t
ESET
t
DSET
t
DH
t
TXD
t
TDR
t
RDR
800
1
2.0
2.0
2.0
1.2
833
865
2.0
Note
Min.
Typ.
416
Max.
800
Unit
µs
µs
µs
µs
µs
µs
µs
µs
ms
MX469P package discontinued
Notes:
1. Consider the Xtal/clock tolerance.
2. All TX timings are related to the TX Sync Output.
t
SYNC
TX
ENABLE
t
ESET
TX
SYNC
t
DSET
TX DATA
DC = Don't Care
DV = Data Valid
t
DH
t
TDR
DV
DC
DV
t
TDR
DC
DC
DV
DC
t
TXD
OPEN CIRCUIT
1200 BPS
TX OUTPUT
OPEN CIRCUIT
Figure 3: Transmitter Timing: 1200bps
LOGIC '1'
LOGIC '0'
RX
SIGNAL I/P
1200 BPS
1
t
ID
RX
SYNC O/P
(1200Hz)
0
t
RDR
1
Undetermined
State
CLOCKED
DATA O/P
0
LOGIC '1'
LOGIC '0'
Figure 4: Receiver Timing Diagram: 1200bps
1998
MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480081.010
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
CMLMICRO [ CML MICROCIRCUITS ]
