MX909A データシートの表示（PDF） - CML Microsystems Plc
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MX909A Datasheet PDF : 38 Pages
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GMSK Modem Data Pump
2 Signal List
Page 4 of 37
MX909A PRELIMINARY INFORMATION
Pin No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Signal
IRQ
D7
D6
D5
D4
D3
D2
D1
D0
RD
WR
VSS
CS
A0
A1
XTAL
XTAL/CLOCK
DOC 2
DOC 1
TXOUT
VBIAS
RXIN
RXAMPOUT
VDD
Type
Description
output
BUS
BUS
BUS
BUS
BUS
BUS
This pin is a ‘wire-ORable' output for connection to the host µC's Interrupt
Request input. When active, this output has a low impedance pull down
to VSS. It has a high impedance when inactive.
Pins 2-9 (D7 - D0) are 8-bit, bi-directional, 3-state
µC interface data lines
BUS
BUS
input
input
power
Read. An active low logic level input used to control the reading of data
from the modem into the host µC.
Write. An active low logic level input used to control the writing of data
into the modem from the host µC.
Negative supply. (ground).
input Chip Select. An active low logic level input to the modem. It is used to
enable a data read or write operation.
input Logic level modem register select input.
input Logic level modem register select input.
output Output of the on-chip oscillator.
input
output
output
output
output
input
output
power
Input to the on-chip oscillator, for an external CLOCK or XTAL circuit.
Connects to the Rx level measurement circuitry. Should be capacitive
coupled to VSS.
Connects to the Rx level measurement circuitry. Should be capacitive
coupled to VSS.
Tx output signal from the modem.
A bias line for the internal circuitry, held at VDD/2. This pin must be
bypassed to VSS by a capacitor mounted close to the device pins.
Input to the Rx input amplifier.
The output of the Rx input amplifier.
Positive supply. Voltage levels are dependent upon this supply. This pin
should be bypassed to VSS by a capacitor mounted close to the device
pins.
¤2001 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480134.005
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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