参数资料
型号: LTC1323CS16#TRPBF
厂商: Linear Technology
文件页数: 12/12页
文件大小: 0K
描述: IC TXRX EIA562 5V SINGLE 16-SOIC
标准包装: 2,500
类型: 收发器
驱动器/接收器数: 1/1
规程: AppleTalk
电源电压: 4.5 V ~ 5.5 V
安装类型: 表面贴装
封装/外壳: 16-SOIC(0.154",3.90mm 宽)
供应商设备封装: 16-SOIC
包装: 带卷 (TR)
9
LTC1323
SWITCHI G WAVEFOR S
UW
Figure 12. Single-Ended Receiver
1.5V
RXI, RXI
RXI
1.5V
VOL
VOH
VIL
VIH
V
VIH
LTC1323 F12
tPHL
0.8V
1.5V
tPLH
2.4V
1.5V
f = 1MHz: tr ≤ 10ns: tf ≤ 10ns
Figure 13. Receiver Enable and Disable
1.5V
3V
0V
RXEN
f = 1MHz: tr ≤ 10ns: tf ≤ 10ns
1.5V
RXO, RXO, RXDO
VOL
5V
tZL
tLZ
0.5V
OUTPUT NORMALLY LOW
0V
LTC1323 F13
2.3V
tZH
VOH
OUTPUT NORMALLY HIGH
tHZ
0.5V
RXO, RXO, RXDO
APPLICATIO S I FOR ATIO
UU
W
U
Functional Description
The “serial port” on the back of an Apple-compatible
computer or peripheral is a fairly versatile “multi-protocol”
connector. It must be able to connect to a wide bandwidth
LAN (an AppleTalk/LocalTalk network), which requires a
high speed differential transceiver to meet the AppleTalk
specification, and it must also be able to connect directly to
a printer or modem through a short RS232 style link. The
LTC1323 is designed to provide all the functions necessary
to implement such a port on a single chip. Two versions of
the LTC1323 are available: a 16-pin SO version which
provides the minimum solution for interfacing to an
AppleTalk network in a smaller package, and a larger 24-pin
SO Wide version which additionally includes all the hand-
shaking lines required to implement a complete AppleTalk/
modem/printer serial port. All LTC1323s run from a single
5V power supply while providing true single-ended com-
patibility, and include a 0.5
A low power shutdown mode
to improve lifetime in battery-powered devices. The 24-
pin SO Wide version also includes a receiver keep-alive
mode for monitoring external signals while drawing 65
A
typically.
The LTC1323 includes an RS422-compatible differential
driver/receiver pair for data transmission, with the driver
specified to drive 2V into the 100
primary of a typical
LocalTalk interface transformer/RFI interference network.
Either output of the differential RS422 driver can also act as
an single-ended driver, allowing the LTC1323 to commu-
nicate over a standard serial connection. The 24-pin SO
Wide LTC1323 also includes an extra single ended only
driver and two extra RS232-compatible single-ended re-
ceivers for handshaking lines. All versions include an on-
board charge pump to provide a regulated – 5V supply
required for the single-ended drivers. The charge pump
can also provide up to 10mA of external load current to
power other circuitry.
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