CMX969P4 查看數據表（PDF） - MX-COM Inc
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CMX969P4 Datasheet PDF : 35 Pages
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MOTIENTSM/ARDISSM RD-LAPTM MDC4800 Modem
5
2 Signal List
CMX969 Advance Information
Package
P4/E2/D5
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
Name
IRQ
Type
output
D7
bi-directional
D6
bi-directional
D5
bi-directional
D4
bi-directional
D3
bi-directional
D2
bi-directional
D1
bi-directional
D0
bi-directional
RD
input
WR
input
VSS
CS
A0
A1
XTAL
XTAL
power
input
input
input
output
input
NC
TXOUT
VBIAS
output
output
RXIN
RXFB
VDD
input
output
power
Description
A 'wire-ORable' output for connection to the host µC's
Interrupt Request input. This output has a low impedance
pull down to VSS when active and is high impedance when
inactive.
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.
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.
No connection should be made to these pins (reserved for
possible future use)
The Tx signal output from the modem.
A bias line for the internal circuitry, held at VDD/2.
This pin must be decoupled to VSS by a capacitor mounted
close to the device pins.
The input to the Rx input amplifier.
The output of the Rx input amplifier.
The positive supply rail. Levels and voltages are dependent
upon this supply. This pin should be decoupled to VSS by a
capacitor.
Table 1: Signal List
Note: Internal protection diodes are connected from each signal pin to VDD and VSS.
¤2001 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480211.002
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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