CMX867(2000) Ver la hoja de datos (PDF) - CML Microsystems Plc
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CMX867 Datasheet PDF : 45 Pages
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Low Power V.22 Modem
CMX867
1.3 Signal List
CMX867
D2/E2/P4
Pin No.
1
Signal
Description
Name
XTALN
Type
O/P The output of the on-chip Xtal oscillator inverter.
2
3
4, 8, 12, 17, 21
5
6
7, 16, 24
9
10
11
13
14
15
18
19
20
22
23
XTAL/CLOCK
RDRVN
VSS
RD
RT
VDD
RXAFB
RXAN
RXA
VBIAS
TXAN
TXA
CSN
COMMAND
DATA
SERIAL
CLOCK
REPLY DATA
IRQN
I/P
O/P
Power
The input to the oscillator inverter from the Xtal
circuit or external clock source.
Relay drive output, low resistance pull down to
VSS when active and medium resistance pull up
to VDD when inactive.
The negative supply rail (ground).
I/P
BI
Power
O/P
Schmitt trigger input to the Ring signal detector.
Connect to VSS if Ring Detector not used.
Open drain output and Schmitt trigger input
forming part of the Ring signal detector. Connect
to VDD if Ring Detector not used.
The positive supply rail. Levels and thresholds
within the device are proportional to this voltage.
The output of the Rx Input Amplifier.
I/P The inverting input to the Rx Input Amplifier
I/P The non-inverting input to the Rx Input Amplifier
O/P Internally generated bias voltage of
approximately VDD /2, except when the device is
in ‘Powersave’ mode when VBIAS will discharge
to VSS. Should be decoupled to VSS by a
capacitor mounted close to the device pins.
O/P The inverted output of the Tx Output Buffer.
O/P The non-inverted output of the Tx Output Buffer.
I/P The C-BUS chip select input from the µC.
I/P The C-BUS serial data input from the µC.
I/P The C-BUS serial clock input from the µC.
T/S A 3-state C-BUS serial data output to the µC.
This output is high impedance when not sending
data to the µC.
O/P A ‘wire-ORable’ output for connection to a µC
Interrupt Request input. This output is pulled
down to VSS when active and is high impedance
when inactive. An external pullup resistor is
required ie R1 of Figure 2.
© 2000 Consumer Microcircuits Limited
4
D/867/1
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