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LTC2801 数据表(PDF) 5 Page - Analog Devices

部件名 LTC2801
功能描述  Single-Bus RS485/RS232 Multiprotocol Transceiver with Switchable Termination
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

LTC2801 数据表(HTML) 5 Page - Analog Devices

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LTC2873
5
REV B
For more information www.analog.com
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
RS485 Switching Characteristics
Maximum Data Rate
(Note 3) (Figure 15)
l
20
Mbps
tPLHD485, tPHLD485 Driver Propagation Delay
RDIFF = 54Ω, CL = 100pF (Figure 4)
l
20
70
ns
Driver Propagation Delay Difference
RDIFF = 54Ω, CL = 100pF (Figure 4)
tPLHD485 – tPHLD485
l
0
±6
ns
tSKEWD485
Driver Skew (A/DO to B/RI)
RDIFF = 54Ω, CL = 100pF (Figure 4)
0
±8
ns
tRD485, tFD485
Driver Rise or Fall Time
RDIFF = 54Ω, CL = 100pF (Figure 4)
7.5
12.5
ns
tZLD485, tZHD485,
tLZD485, tHZD485
Driver Output Enable or Disable Time
SHDN = VL, RL = 500Ω, CL = 50pF,
DE485 ↑ and ↓ (Figure 5)
l
120
ns
tZHSD485, tZLSD485 Driver Enable from Shutdown Time
(Note 7)
DE485/F232 = VL, RL = 500Ω,
CL = 50pF, SHDN ↑ (Figure 5)
l
4
12
µs
tHZSD485, tLZSD485 Driver Output Disable Into
Shutdown Time
DE485/F232 = VL, RL = 500Ω,
CL = 50pF, SHDN ↓ (Figure 5)
l
0.5
1
μs
tPLHR485, tPHLR485 Receiver Input to Output Time
CL = 15pF, VCM = 1.5V,
|A/DO to B/RI| = 1.5V, (Figure 6)
l
45
85
ns
tSKEWR485
Differential Receiver Skew
tPLHR485 – tPHLR485
CL = 15pF (Figure 6)
l
0
±9
ns
tRR485, tFR485
Receiver Output Rise or Fall Time
CL = 15pF (Figure 6)
l
3
15
ns
tZLR485, tZHR485,
tLZR485, tHZR485
Receiver Output Enable or
Disable Time
485/232 = SHDN = VL, RL = 1kΩ,
CL = 15pF, RE485 ↓ and ↑ (Figure 7)
l
12
85
ns
tZHSR485, tZLSR485 Receiver Enable from Shutdown Time
(Note 7)
485/232 = VL , RE485 = 0V, RL = 1kΩ,
CL = 15pF , SHDN ↑ (Figure 7)
l
4
12
µs
tHZSR485, tLZSR485 Receiver Output Disable Into
Shutdown Time
485/232 = VL, RE485 = 0V, RL = 1kΩ,
CL = 15pF ,SHDN ↓ (Figure 7)
l
0.5
1
µs
tRTEN485, tRTZ485
Termination Enable or Disable
Time
485/232 = VL, SHDN = VL, B = 0,
(A/DO to B/RI) = 2V (Figure 8)
l
100
µs
RS232 Switching Characteristics
Maximum Data Rate (Figure 15)
RL = 3kΩ, CL = 2.5nF, (Fast, Slow Modes)
RL = 3kΩ, CL = 1nF, (Fast, Slow Modes)
RL = 3kΩ, CL = 0.25nF, (Fast Mode)
l
l
l
100
250
1000
kbps
kbps
kbps
Driver Slew Rate (Figure 9)
RL = 3kΩ, CL = 2.5nF, (Fast, Slow Modes)
RL = 3kΩ, CL = 50pF, (Slow Mode)
RL = 3kΩ, CL = 50pF, (Fast Mode)
l
l
l
2
30
150
V/µs
V/µs
V/µs
tPHLD232, tPLHD232 Driver Propagation Delay (Figure 9)
RL = 3kΩ, CL = 50pF, (Slow Mode)
RL = 3kΩ, CL = 50pF, (Fast Mode)
l
l
1.5
0.4
3
1
µs
µs
tSKEWD232
Driver Skew (Figure 9)
RL = 3kΩ, CL = 50pF, (Slow Mode)
RL = 3kΩ, CL = 50pF, (Fast Mode)
0
0
±400
±100
ns
ns
tZLSD232, tZHSD232 Driver Enable from Shutdown
Time (Figure 7)
VDD = 7.0V, VEE = –6.3V, 485/232 = 0V,
RL = 3kΩ, CL = 50pF, SHDN ↑ (Figure 10)
l
5
12
µs
tLZSD232, tHZSD232 Driver Output Disable into
Shutdown Time
485/232 = 0V, RL = 3kΩ, CL = 50pF,
SHDN ↓ (Figure 10)
l
0.6
2
µs
tPHLR232, tPLHR232 Receiver Propagation Delay
CL = 150pF (Figure 11)
l
60
200
ns
tSKEWR232
Receiver Skew
CL = 150pF (Figure 11)
25
ns
tRR232, tFR232
Receiver Output Rise or Fall Time
CL = 150pF (Figure 11)
l
70
200
ns
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = VL = 3.3V, TE485 = VL, LB = 0V unless otherwise noted. (Notes 2, 6)
SWITCHING CHARACTERISTICS


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