参数资料
型号: COM20019ILJP
厂商: STANDARD MICROSYSTEMS CORP
元件分类: 微控制器/微处理器
中文描述: 1 CHANNEL(S), 312.5K bps, LOCAL AREA NETWORK CONTROLLER, PQCC28
封装: PLASTIC, LCC-28
文件页数: 65/65页
文件大小: 386K
代理商: COM20019ILJP
Cost Competitive ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
SMSC COM20019I
Page 9
Rev. 09-25-07
DATASHEET
PLCC PIN
NO.
NAME
SYMBOL
DESCRIPTION
TRANSMISSION MEDIA INTERFACE
19,18
nPulse 2,
nPulse 1
nPULSE2,
nPULSE1
Output (nPULSE1), Input/Output (nPULSE2).
In Normal Mode, these active low signals carry
the transmit data information, encoded in pulse
format, as DIPULSE waveform. When the
device is in Backplane Mode, the nPULSE1
signal driver is programmable (push/pull or
open-drain), while the nPULSE2 signal
provides a clock with frequency of double the
data rate. nPULSE1 is connected to a weak
internal pull-up resistor on the open/drain
driver in backplane mode. The COM20019I
does not support the Normal Mode. Use only
in the Backplane Mode.
20
Receive In
RXIN
Input. This signal carries the receive data
information from the line transceiver.
21
nTransmit
nEnable
nTXEN
Output. This signal is used prior to the Power-
up to enable the line drivers for transmission.
The polarity of the signal is programmable
through the nPULSE2 pin.
nPULSE2 floating before Power-up: nTXEN
active low (Default option)
nPULSE2 grounded before Power-up: nTXEN
active high (This option is only available in
Backplane Mode)
16,17
Crystal
Oscillator
XTAL1,
XTAL2
An external crystal should be connected to
these pins. Oscillation frequency range is from
10 to 20 MHz. If an external TTL clock is used
instead, it must be connected to XTAL1 with a
390
pull-up resistor, and XTAL2 should be
left floating.
15,28
Power
Supply
VDD
+5 Volt Power Supply pin.
7,14,22
Ground
VSS
Ground pin.
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