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FX949 Datasheet(PDF) 4 Page - CML Microcircuits

Part # FX949
Description  CDPD Wireless Modem Data Pump
PDF  25 Pages
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Manufacturer  CMLMICRO [CML Microcircuits]
Direct Link  http://www.cmlmicro.com
Logo CMLMICRO - CML Microcircuits

FX949 Datasheet(HTML) 4 Page - CML Microcircuits

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CDPD Wireless Modem Data Pump
FX949
© 1996 Consumer Microcircuits Limited
4
D/949/5
1.3
Signal List
Package
L4
Package
L6
Signal
Description
Pin No.
Pin No.
Name
Type
2
8
D0
BI
)
3
9
D1
BI
)
4
10
D2
BI
)
5
11
D3
BI
)
8-bit bidirectional tristate
µP interface
7
12
D4
BI
)
data lines.
8
13
D5
BI
)
9
14
D6
BI
)
10
15
D7
BI
)
12
17
VDD
Power
The positive supply rail. Levels and voltages are
dependent upon this supply. This pin should be
decoupled to VSS by a capacitor.
13
18
VBIAS
O/P
A bias line for the internal circuitry, held at
½ VDD. This pin must be decoupled by a
capacitor mounted close to the device pins (see
Figures 2 and 3).
14
19
RX SIGNAL
FEEDBACK
O/P
The output of the Rx input amplifier and the input
to the Rx filter.
15
20
RX SIGNAL
I/P
The inverting input to the Rx input amplifier.
16
17
21
22
DOC 1
DOC 2
O/P
O/P
)
Connections to the Rx level measurement
)
circuitry. A capacitor should be connected
)
from each pin to VSS.
18
23
TX SIGNAL
O/P
The inverted Tx signal output from the modem.
20
24
Vss
Power
The negative supply rail (ground).
26
31
XTALN
O/P
The inverted output of the on-chip oscillator.
27
32
CLOCK/XTAL
I/P
The input to the on-chip oscillator, for external
Xtal circuit or clock.
32
36
IRQN
O/P
A 'wire-ORable' output for connection to the
controlling
µP's Interrupt Request input. This
output has a low impedance pull down to VSS
when active and is high impedance when
inactive.



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