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参数资料
| 型号： | LTC1324CSW |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 通用总线功能 |
| 英文描述： | Single Supply LocalTalk Transceiver |
| 中文描述： | LINE TRANSCEIVER, PDSO16 |
| 封装： | 0.300 INCH, PLASTIC, SOP-16 |
| 文件页数： | 7/8页 |
| 文件大小： | 241K |
| 代理商： | LTC1324CSW |
7
LTC1324
SWITCHI
G WAVEFOR
S
U
W
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 represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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 1
μ
A and the driver and
receiver outputs are three-stated.
Supply Bypassing
The LTC1324 requires V
CC
be bypassed to prevent data
errors. A 1
μ
F capacitor from V
CC
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-
APPLICATIO
S I
N
FOR
ATIO
U
W
U
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 5.1
to ensure enough voltage
swing on the cable (Figure 8). Another way to get maxi-
mum 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.
100pF
1324 F09
FERRITE BEAD
FERRITE BEAD
Figure 9
Figure 8
5.1
1324 F08
TXD
+
TXD
–
100pF
100pF
TXD
5.1
120
5.1
5.1
Figure 7. Receiver Enable and Disable
1.5V
3V
0V
f = 1MHz: t
r
≤
10ns: t
f
≤
10ns
1.5V
V
OL
5V
t
ZL
t
LZ
0.5V
OUTPUT NORMALLY LOW
0V
1324 F07
2.3V
2.3V
t
ZH
V
OH
OUTPUT NORMALLY HIGH
t
HZ
0.5V
RXEN
RXO, RXO, RXDO
RXO, RXO, RXDO
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