MX919BLH データシートの表示（PDF） - MX-COM Inc
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MX919BLH Datasheet PDF : 48 Pages
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4-Level FSK Modem Data Pump
2. Signal List
Page 7 of 47
MX919B 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
DOC2
DOC1
TXOUT
VBIAS
RXIN
RXAMPOUT
VDD
Type
output
BUS
BUS
BUS
BUS
BUS
BUS
BUS
BUS
input
Input
power
input
input
input
output
input
output
output
output
output
input
output
power
Description
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 high impedance when inactive.
Pins 2-9 (D7-D0) are 8-bit, bi-directional,
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.
Negative supply (ground).
Chip Select. An active low logic level input to the modem used to
enable a data read or write operation.
Logic level modem register select input
Logic level modem register select input
Output of the on-chip oscillator.
Input to the on-chip oscillator, for an external Xtal circuit or clock.
Connection to the Rx level measurement circuitry. Should be
capacitive coupled to VSS .
Connection to the Rx level measurement circuitry. Should be
capacitive coupled to VSS
Tx signal output 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.
Output of the Rx input amplifier.
Positive supply. Levels and voltages are dependent upon this supply.
This pin should be bypassed to VSS by a capacitor mounted close to
the device pins.
Table 1: Signal List
©2001 MX•COM, INC.
www.mxcom.com Tele: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480170.003
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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