FX919B Datasheet, PDF (4/47 Pages) CML Microcircuits – Excellent Radio Fading Performance

4-Level FSK Modem Data Pump
FX919B
1.3 Signal List
Package
P4/D2/D5
Pin No.
1
Signal
Name
IRQN
Type
O/P
2
D7
BI
3
D6
BI
4
D5
BI
5
D4
BI
6
D3
BI
7
D2
BI
8
D1
BI
9
D0
BI
10
RDN
I/P
11
WRN
I/P
12
Vss
Power
13
CSN
I/P
14
A0
I/P
15
A1
I/P
16
XTALN
O/P
17
XTAL/CLOCK
I/P
18
DOC 2
O/P
19
DOC 1
O/P
Description
A 'wire-ORable' output for connection to the host
µC's Interrupt Request input. This output has a
low impedance pull down to V_SS when active
and is high impedance when inactive.
)
)
)
) 8-bit bidirectional 3-state µC interface data
) lines.
)
)
)
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.
The negative supply rail (ground).
Chip Select. An active low logic level input to the
modem, used to enable a data read or write
operation.
) Two logic level modem register select
) inputs.
The output of the on-chip oscillator.
The input to the on-chip oscillator, for external
Xtal circuit or clock.
) Connections to the Rx level measurement
) circuitry. A capacitor should be connected
) from each pin to V_SS.
© 1997 Consumer Microcircuits Limited
4
D/919B/1