CMX624 데이터 시트보기 (PDF) - MX-COM Inc
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CMX624 Datasheet PDF : 25 Pages
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Bell 202 and V.23 Compatible Modem
5
3 External Components
CMX624 Preliminary Information
C1
C2
X1
XTAL
XTAL/CLOCK
SERIAL CLOCK
C-BUS COMMAND DATA
VDD to/from
REPLY DATA
R1
µC
CS
IRQ
TX
Tx Line
Interface.
See 5.1
TX+
TXIN-
TX-
VSS
1
24
2
23
3
22
4
21
5
20
6 CMX624 19
7 D5/D2/P4 18
8
17
9
16
10
15
11
14
12
13
VDD
C3
C5
RD
RT
RXAMPOUT
RX-
RX+
RLYDRV
VBIAS
C4
To/from Ring
Detector.
See 5.2
Rx Line
Interface.
See 5.1
Relay Drive.
See 5.1
Figure 2: Recommended External Components
R1
C1, C2
C3, C4
C5
X1
Note 1
Note 2
100kΩ
18pF
0.1µF
3.579545MHz
±5%,
±10%
±10%
Tolerances for Resistors and Capacitors are as indicated unless otherwise stated.
Table 1: Recommended External Components
Notes:
1. This component is only required for compatibility with CMX644A, see CMX644A Data Bulletin for
additional details.
2. For best results, a crystal oscillator design should drive the clock inverter input with signal levels of at
least 40% of VDD, peak to peak. Tuning fork crystals generally cannot meet this requirement. To obtain
crystal oscillator design assistance, please consult you crystal manufacturer.
©1999 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480180.108
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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