参数资料
型号: LTC1480IN8#PBF
厂商: Linear Technology
文件页数: 6/8页
文件大小: 0K
描述: IC TXRX 3.3V RS485 LOWPWR 8-DIP
标准包装: 50
类型: 收发器
驱动器/接收器数: 1/1
规程: RS422,RS485
电源电压: 3 V ~ 3.6 V
安装类型: 通孔
封装/外壳: 8-DIP(0.300",7.62mm)
供应商设备封装: 8-PDIP
包装: 管件
LTC1480
6
1480fa
LOGIC
VCC
SD3
P1
D1
OUTPUT
SD4
D2
N1
1480 F10
P1
LOGIC
VCC
P1
D1
OUTPUT
D2
N1
1480 F09
1.5V
tZL(SHDN), tZL
tZH(SHDN), tZH
1.5V
tLZ
0.5V
tHZ
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
3V
0V
RE
3.3V
VOL
VOH
0V
RO
1480 F08
f = 1MHz, tr ≤ 10ns, tf ≤ 10ns
1.5V
tPHL
RO
–VOD2
A – B
0V
1.5V
tPLH
OUTPUT
INPUT
VOD2
VOL
VOH
1480 F07
f = 1MHz, tr ≤ 10ns, tf ≤ 10ns
1.5V
2.3V
tZH(SHDN), tZH
tZL(SHDN), tZL
1.5V
tLZ
0.5V
tHZ
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
3V
0V
DE
3.3V
VOL
VOH
0V
A, B
1480 F06
f = 1MHz, tr ≤ 10ns, tf ≤ 10ns
APPLICATIO S I FOR ATIO
WU
U
SWITCHI G TI E WAVEFOR S
UW
W
CMOS Output Driver
The LTC1480 transceiver provides full RS485 compatibility
while operating from a single 3.3V supply. The RS485
specification requires that a transceiver withstand common
mode voltages of up to 12V or –7V at the RS485 line
connections. Additionally, the transceiver must be immune
to both ESD and latch-up. This rules out traditional CMOS
drivers, which include parasitic diodes from their driver
outputs to each supply rail (Figure 9). The LTC1480 uses a
proprietary process enhancement which adds a pair of
Schottky diodes to the output stage (Figure 10), preventing
Figure 9. Conventional
CMOS Output Stage
Figure 10.
LTC1480 Output Stage
Figure 6. Driver Enable and Disable Times
Figure 7. Receiver Propagation Delays
Figure 8. Receiver Enable and Disable Times
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