CMX654D4 データシートの表示（PDF） - MX-COM Inc
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CMX654D4 Datasheet PDF : 12 Pages
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V.23 Transmit Modulator
4
CMX654 PRELIMINARY INFORMATION
2 Signal List
D4/P3
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Signal
Name
Type
XTAL
input
XTAL/CLOCK input
M0
input
M1
input
TXOUT
VSS
VBIAS
-
TXD
CLK
-
-
RDY
N/C
output
Power
output
-
input
input
N/C
N/C
output
VDD
Power
Description
The output of the on-chip Xtal oscillator inverter.
The input to the on-chip Xtal oscillator inverter.
A logic level input for setting the mode of the device.
See Section 4.2.
A logic level input for setting the mode of the device.
See Section 4.2.
Connect to VSS.
No connection, do not connect to this pin.
The output of the FSK generator.
The negative supply rail (ground).
Internally generated bias voltage, held at VDD/2 when the device is
not in 'Zero-Power' mode. Should be decoupled to VSS by a
capacitor mounted close to the device pins.
Connect to VDD.
A logic level input for either the raw input to the FSK Modulator or
data to be re-timed depending on the state of the M0, M1 and CLK
inputs. See Section 4.3.
A logic level input which may be used to clock data bits into the Tx
FSK Data Retiming block.
No connection, do not connect to this pin.
No connection, do not connect to this pin.
"Ready for Tx data transfer" output of the on-chip data retiming
circuit. This open-drain active low output may be used as an
Interrupt Request/Wake-up input to the associated PC. An external
pull-up resistor should be connected between this output and VDD.
The positive supply rail. Levels and thresholds within the device
are proportional to this voltage. Should be decoupled to VSS by a
capacitor mounted close to the device pins.
VDD and VBIAS decoupling is very important. It is recommended that the decoupling capacitors be placed
so that connections between them and the device pins are as short as practicable.
Table 1: Signal List
¤1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480186.001
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All Trademarks and Service marks are held by their respective companies.
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