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| 型号： | LTC1324CS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/8页 |
| 文件大小： | 0K |
| 描述： | IC TXRX LOCALTALK 5V SNGL 16SOIC |
| 标准包装： | 50 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | AppleTalk |
| 电源电压： | 4.75 V ~ 5.25 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： | 管件 |
LTC1324
7
1324fa
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
SWITCHING WAVEFORMS
1.5V
3V
0V
f = 1MHz: tr ≤ 10ns: tf ≤ 10ns
1.5V
VOL
5V
tZL
tLZ
0.5V
OUTPUT NORMALLY LOW
0V
1324 F07
2.3V
tZH
VOH
OUTPUT NORMALLY HIGH
tHZ
0.5V
RXEN
RXO, RXO, RXDO
Figure 7. Receiver Enable and Disable
APPLICATIONS INFORMATION
Thermal Shutdown Protection
The LTC1324 includes a thermal shutdown circuit which
protects against prolonged shorts at the driver outputs.
If a driver output is shorted to another output, ground or
to the power supply, the current will be initially limited to
a maximum of 250mA. When the die temperature rises
above 150°C, the thermal shutdown circuit turns off the
driver outputs. When the die cools to about 130°C, the
outputs turn on. If the short still exists, the part will heat
again and the cycle will repeat. This oscillation occurs at
about 10Hz and prevents the part from being damaged by
excessive power dissipation. When the short is removed,
the part will return to normal operation.
Power Shutdown
The power shutdown feature of the LTC1324 is designed
for battery-powered systems. When SHDN is forced high,
the part enters shutdown mode. In shutdown, the supply
current typically drops from 1mA to 1μA and the driver
and receiver outputs are three-stated.
Supply Bypassing
The LTC1324 requires VCC be bypassed to prevent data
errors. A 1μF capacitor from VCC to ground is adequate.
EMI Filters and Slew Rate Control
Most LocalTalk applications need to use an electromag-
netic interference (EMI) filter consisting of a resistor-
capacitor T network between each driver, receiver and the
connector. Unfortunately, the resistors will attenuate the
driver’s output signal applied to the cable. Because the
LTC1324 uses a single 5V supply, the resistors’ values
should be reduced to 5.1Ω to ensure enough voltage swing
on the cable (Figure 8). Another way to get maximum swing
and EMI immunity is to use a ferrite bead and capacitor as
the T network (Figure 9). For data rates below 250kbps,
the LTC1324 features a low EMI mode which limits the
rise time of the drivers to 400ns. With a lower rise time,
the EMI network can be eliminated, allowing more signal
voltage to reach the cable. Figures 10 and 11 show the
output signals of the driver with different slew rates.
5.1Ω
1324 F08
TXD+
TXD–
100pF
TXD
5.1Ω
120Ω
5.1Ω
Figure 9
Figure 8
100pF
1324 F09
FERRITE BEAD
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