FX949 Datasheet, PDF (4/25 Pages) CML Microcircuits – CDPD Wireless Modem Data Pump

CDPD Wireless Modem Data Pump
1.3 Signal List
FX949
Package Package
L4
L6
Signal
Description
Pin No. Pin No.
Name
Type
2
8
D0
3
9
D1
4
10
D2
5
11
D3
7
12
D4
8
13
D5
9
14
D6
10
15
D7
BI
)
BI
)
BI
)
BI
) 8-bit bidirectional tristate µP interface
BI
) data lines.
BI
)
BI
)
BI
)
12
17
V_DD
13
18
V_BIAS
Power
O/P
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).
14
19
RX SIGNAL
O/P The output of the Rx input amplifier and the input
FEEDBACK
to the Rx filter.
15
20
RX SIGNAL
I/P The inverting input to the Rx input amplifier.
16
21
DOC 1
17
22
DOC 2
O/P ) Connections to the Rx level measurement
O/P ) circuitry. A capacitor should be connected
) from each pin to V_SS.
18
23
TX SIGNAL
O/P The inverted Tx signal output from the modem.
20
24
Vss
26
31
XTALN
Power The negative supply rail (ground).
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 V_SS
when active and is high impedance when
inactive.
© 1996 Consumer Microcircuits Limited
4
D/949/5