LTC2873H Просмотр технического описания (PDF) - Analog Devices
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LTC2873H Datasheet PDF : 32 Pages
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LTC2873
SWITCHING CHARACTERISTICS 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)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
RS485 Switching Characteristics
Maximum Data Rate
(Note 3) (Figure 15)
l 20
tPLHD485, tPHLD485 Driver Propagation Delay
RDIFF = 54Ω, CL = 100pF (Figure 4)
l
Driver Propagation Delay Difference
RDIFF = 54Ω, CL = 100pF (Figure 4)
l
tPLHD485 – tPHLD485
tSKEWD485
Driver Skew (A/DO to B/RI)
RDIFF = 54Ω, CL = 100pF (Figure 4)
tRD485, tFD485
Driver Rise or Fall Time
RDIFF = 54Ω, CL = 100pF (Figure 4)
tZLD485, tZHD485, Driver Output Enable or Disable Time SHDN = VL, RL = 500Ω, CL = 50pF,
l
tLZD485, tHZD485
DE485 ↑ and ↓ (Figure 5)
tZHSD485, tZLSD485 Driver Enable from Shutdown Time DE485/F232 = VL, RL = 500Ω,
l
(Note 7)
CL = 50pF, SHDN ↑ (Figure 5)
tHZSD485, tLZSD485 Driver Output Disable Into
DE485/F232 = VL, RL = 500Ω,
l
Shutdown Time
CL = 50pF, SHDN ↓ (Figure 5)
tPLHR485, tPHLR485 Receiver Input to Output Time
CL = 15pF, VCM = 1.5V,
l
|A/DO to B/RI| = 1.5V, (Figure 6)
20
70
0
±6
0
±8
7.5
12.5
120
4
12
0.5
1
45
85
tSKEWR485
Differential Receiver Skew
CL = 15pF (Figure 6)
l
tPLHR485 – tPHLR485
tRR485, tFR485
Receiver Output Rise or Fall Time
CL = 15pF (Figure 6)
l
tZLR485, tZHR485,
tLZR485, tHZR485
Receiver Output Enable or
Disable Time
485/232 = SHDN = VL, RL = 1kΩ,
l
CL = 15pF, RE485 ↓ and ↑ (Figure 7)
tZHSR485, tZLSR485 Receiver Enable from Shutdown Time 485/232 = VL , RE485 = 0V, RL = 1kΩ,
l
(Note 7)
CL = 15pF , SHDN ↑ (Figure 7)
tHZSR485, tLZSR485 Receiver Output Disable Into
Shutdown Time
485/232 = VL, RE485 = 0V, RL = 1kΩ,
l
CL = 15pF ,SHDN ↓ (Figure 7)
tRTEN485, tRTZ485 Termination Enable or Disable
485/232 = VL, SHDN = VL, B = 0,
l
Time
(A/DO to B/RI) = 2V (Figure 8)
0
±9
3
15
12
85
4
12
0.5
1
100
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 100
l 250
l 1000
Driver Slew Rate (Figure 9)
RL = 3kΩ, CL = 2.5nF, (Fast, Slow Modes) l 2
RL = 3kΩ, CL = 50pF, (Slow Mode)
l
30
RL = 3kΩ, CL = 50pF, (Fast Mode)
l
150
tPHLD232, tPLHD232 Driver Propagation Delay (Figure 9) RL = 3kΩ, CL = 50pF, (Slow Mode)
l
RL = 3kΩ, CL = 50pF, (Fast Mode)
l
1.5
3
0.4
1
tSKEWD232
Driver Skew (Figure 9)
RL = 3kΩ, CL = 50pF, (Slow Mode)
RL = 3kΩ, CL = 50pF, (Fast Mode)
0
±400
0
±100
tZLSD232, tZHSD232 Driver Enable from Shutdown
Time (Figure 7)
VDD = 7.0V, VEE = –6.3V, 485/232 = 0V,
l
RL = 3kΩ, CL = 50pF, SHDN ↑ (Figure 10)
5
12
tLZSD232, tHZSD232 Driver Output Disable into
Shutdown Time
485/232 = 0V, RL = 3kΩ, CL = 50pF,
l
SHDN ↓ (Figure 10)
0.6
2
tPHLR232, tPLHR232
tSKEWR232
tRR232, tFR232
Receiver Propagation Delay
Receiver Skew
Receiver Output Rise or Fall Time
CL = 150pF (Figure 11)
CL = 150pF (Figure 11)
CL = 150pF (Figure 11)
l
60
200
25
l
70
200
UNITS
Mbps
ns
ns
ns
ns
ns
µs
μs
ns
ns
ns
ns
µs
µs
µs
kbps
kbps
kbps
V/µs
V/µs
V/µs
µs
µs
ns
ns
µs
µs
ns
ns
ns
REV B
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