参数资料
型号: LTC1535ISW#TRPBF
厂商: Linear Technology
文件页数: 13/18页
文件大小: 0K
描述: IC TRANSCEIVER RS485 ISO 28SOIC
标准包装: 1,000
类型: 收发器
驱动器/接收器数: 1/1
规程: RS485
电源电压: 4.5 V ~ 5.5 V
安装类型: 表面贴装
封装/外壳: 28-SOIC(0.295",7.50mm 宽)
供应商设备封装: 28-SOIC
包装: 带卷 (TR)
LTC1535
4
1535fb
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
tSJ
Data Sample Jitter
Figure 8, (Note 7)
l
250
285
ns
fMAX
Max Baud Rate
Jitter = 10% Max, SLO = 1, (Note 8)
l
250
410
kBd
tPLH
Driver Input to Output
DE = 1, SLO = 1, Figure 4, Figure 6
DE = 1, SLO = 0, Figure 4, Figure 6
l
600
1300
855
1560
ns
tPHL
Driver Input to Output
DE = 1, SLO = 1, Figure 4, Figure 6
l
600
1300
855
1560
ns
tr, tf
Driver Rise or Fall Time
DE = 1, SLO = 1, Figure 4, Figure 6
DE = 1, SLO = 0, VCC = VCC2 = 4.5V
l
150
20
500
100
1000
ns
tZH
Driver Enable to Output
DI = 1, SLO = 1, Figure 5, Figure 7
l
1000
1400
ns
tZL
Driver Enable to Output
DI = 0, SLO = 1, Figure 5, Figure 7
l
1000
1400
ns
tLZ
Driver Disable to Output
DI = 0, SLO = 1, Figure 5, Figure 7
l
700
1300
ns
tHZ
Driver Disable to Output
DI = 1, SLO = 1, Figure 5, Figure 7
l
700
1300
ns
tPLH
Receiver Input to RO
RE = 0, Figure 3, Figure 8
l
600
855
ns
tPHL
Receiver Input to RO
RE = 0, Figure 3, Figure 8
l
600
855
ns
tPLH
Receiver Input to RO2
RE = 0, Figure 3, Figure 8
30
ns
tPHL
Receiver Input to RO2
RE = 0, Figure 3, Figure 8
30
ns
tr, tf
Receiver Rise or Fall Time
RE = 0, Figure 3, Figure 8
20
ns
tLZ
Receiver Disable to Output
Figure 3, Figure 9
30
ns
tHZ
Receiver Disable to Output
Figure 3, Figure 9
30
ns
tSTART
Initial Start-Up Time
(Note 9)
1200
ns
tTOF
Data Time-Out Fault
(Note 9)
1200
ns
ST1, ST2 Duty Cycle
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
l
56
57
%
The
l denotes the specications which apply over the full operating
temperature range, otherwise specications are at TA = 25°C. VCC = 5V, VCC2 = 5V, R = 27Ω (RS485) unless otherwise noted.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: RS422 50Ω specication based on RS485 27Ω test.
Note 3: IIN is tested at VCC2 = 5V, guaranteed by design from
GND2 ≤ VCC2 ≤ 5.25V.
Note 4: Input fault conditions on the RS485 receiver are detected with a
xed receiver offset. The offset is such that an input short or open will
result in a high data output.
Note 5: The low voltage detect faults when VCC2 or VCC drops below
VUVL and reenables when greater than VUVH. The fault can be monitored
through the weak driver output on RE.
Note 6: Value derived from 1 second test.
Note 7: The input signals are internally sampled and encoded. The internal
sample rate determines the data output jitter since the internal sampling is
asynchronous with respect to the external data. Nominally, a 4MHz internal
sample rate gives 250ns of sampling uncertainty in the input signals.
Note 8: The maximum baud rate is 250kBd with 10% sampling jitter.
Lower baud rates have lower jitter.
Note 9: Start-up time is the time for communication to recover after a fault
condition. Data time-out is the time a fault is indicated on RE after data
communication has stopped.
Note 10: ICC measured with no load, ST1 and ST2 oating.
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