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