參數(shù)資料
型號(hào)： LTC2850HDD#PBF
廠(chǎng)商： Linear Technology
文件頁(yè)數(shù)： 14/18頁(yè)
文件大?。?/td> 0K
描述： IC TXRX RS485 20MBPS 8-DFN
標(biāo)準(zhǔn)包裝： 121
類(lèi)型： 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù)： 1/1
規(guī)程： RS422，RS485
電源電壓： 3 V ~ 3.6 V
安裝類(lèi)型： 表面貼裝
封裝/外殼： 8-WFDFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 8-DFN-EP（3x3）
包裝： 管件
LTC2850/LTC2851/LTC2852
285012fd
swiTching characTerisTics
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime. High temperatures degrade operating lifetimes.
Operating lifetime is derated at temperatures greater than 105°C.
Note 2: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to device ground unless
otherwise specified.
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 3.3V, unless otherwise noted. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Driver
fMAX
Maximum Data Rate
(Note 3)
l
20
Mbps
tPLHD, tPHLD Driver Input to Output
RDIFF = 54Ω, CL = 100pF (Figure 4)
l
10
50
ns
ΔtPD
Driver Input to Output Difference
|tPLHD – tPHLD|
RDIFF = 54Ω, CL = 100pF (Figure 4)
l
1
6
ns
tSKEWD
Driver Output Y to Output Z
RDIFF = 54Ω, CL = 100pF (Figure 4)
l
1
±6
ns
tRD, tFD
Driver Rise or Fall Time
RDIFF = 54Ω, CL = 100pF (Figure 4)
l
4
12.5
ns
tZLD, tZHD,
tLZD, tHZD
Driver Enable or Disable Time
RL = 500Ω, CL = 50pF, RE = 0V (Figure 5)
(LTC2850, LTC2852)
l
70
ns
tZHSD, tZLSD Driver Enable from Shutdown
RL = 500Ω, CL = 50pF, RE = VCC (Figure 5)
(LTC2850, LTC2852)
l
8
s
tSHDN
Time to Shutdown
RL = 500Ω, CL = 50pF, (DE = ↓, RE = VCC)
or (DE = 0V, RE =
↑) (Figure 5) (LTC2850,
LTC2852)
l
100
ns
Receiver
tPLHR, tPHLR Receiver Input to Output
CL = 15pF, VCM = 1.5V, |VAB| = 1.5V,
tR and tF < 4ns (Figure 6)
l
50
70
ns
tSKEWR
Differential Receiver Skew
|tPLHR – tPHLR|
CL = 15pF (Figure 6)
l
1
6
ns
tRR, tFR
Receiver Output Rise or Fall Time
CL = 15pF (Figure 6)
l
3
12.5
ns
tZLR, tZHR,
tLZR, tHZR
Receiver Enable/Disable
RL =1k, CL =15pF, DE = VCC (Figure 7)
(LTC2850, LTC2852)
l
50
ns
tZHSR, tZLSR Receiver Enable from Shutdown
RL = 1k, CL = 15pF, DE = 0V (Figure 7)
(LTC2850, LTC2852)
l
8
s
Note 3: Maximum data rate is guaranteed by other measured parameters
and is not tested directly.
Note 4: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions.
Overtemperature protection activates at a junction temperature exceeding
150°C. Continuous operation above the specified maximum operating
junction temperature may result in device degradation or failure.
elecTrical characTerisTics The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 3.3V, unless otherwise noted. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Supplies
ICCS
Supply Current in Shutdown Mode
DE = 0V, RE = VCC,
LTC2850, LTC2852 (C and I-Grade)
LTC2850, LTC2852 (H-Grade)
l
0
5
15
A
ICCR
Supply Current in Receive Mode
DE = 0V, RE = 0V (LTC2850, LTC2852)
l
370
900
A
ICCT
Supply Current in Transmit Mode
No Load, DE = VCC, RE = VCC (LTC2850,
LTC2852)
l
450
1000
A
ICCTR
Supply Current with Both Driver and
Receiver Enabled
No Load, DE = VCC, RE = 0V
l
450
1000
A
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