LTC2802 datasheet(5/32 Pages) AD

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LTC2873

REV B

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SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

RS485 Switching Characteristics

Maximum Data Rate

(Note 3) (Figure 15)

Mbps

tPLHD485, tPHLD485 Driver Propagation Delay

RDIFF = 54Ω, CL = 100pF (Figure 4)

Driver Propagation Delay Difference

RDIFF = 54Ω, CL = 100pF (Figure 4)

tPLHD485 – tPHLD485

±6

tSKEWD485

Driver Skew (A/DO to B/RI)

RDIFF = 54Ω, CL = 100pF (Figure 4)

±8

tRD485, tFD485

Driver Rise or Fall Time

RDIFF = 54Ω, CL = 100pF (Figure 4)

7.5

12.5

tZLD485, tZHD485,

tLZD485, tHZD485

Driver Output Enable or Disable Time

SHDN = VL, RL = 500Ω, CL = 50pF,

DE485 ↑ and ↓ (Figure 5)

120

tZHSD485, tZLSD485 Driver Enable from Shutdown Time

(Note 7)

DE485/F232 = VL, RL = 500Ω,

CL = 50pF, SHDN ↑ (Figure 5)

µs

tHZSD485, tLZSD485 Driver Output Disable Into

Shutdown Time

DE485/F232 = VL, RL = 500Ω,

CL = 50pF, SHDN ↓ (Figure 5)

0.5

μs

tPLHR485, tPHLR485 Receiver Input to Output Time

CL = 15pF, VCM = 1.5V,

|A/DO to B/RI| = 1.5V, (Figure 6)

tSKEWR485

Differential Receiver Skew

tPLHR485 – tPHLR485

CL = 15pF (Figure 6)

±9

tRR485, tFR485

Receiver Output Rise or Fall Time

CL = 15pF (Figure 6)

tZLR485, tZHR485,

tLZR485, tHZR485

Receiver Output Enable or

Disable Time

485/232 = SHDN = VL, RL = 1kΩ,

CL = 15pF, RE485 ↓ and ↑ (Figure 7)

tZHSR485, tZLSR485 Receiver Enable from Shutdown Time

(Note 7)

485/232 = VL , RE485 = 0V, RL = 1kΩ,

CL = 15pF , SHDN ↑ (Figure 7)

µs

tHZSR485, tLZSR485 Receiver Output Disable Into

Shutdown Time

485/232 = VL, RE485 = 0V, RL = 1kΩ,

CL = 15pF ,SHDN ↓ (Figure 7)

0.5

µs

tRTEN485, tRTZ485

Termination Enable or Disable

Time

485/232 = VL, SHDN = VL, B = 0,

(A/DO to B/RI) = 2V (Figure 8)

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)

100

250

1000

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)

150

V/µs

tPHLD232, tPLHD232 Driver Propagation Delay (Figure 9)

RL = 3kΩ, CL = 50pF, (Slow Mode)

RL = 3kΩ, CL = 50pF, (Fast Mode)

1.5

0.4

µs

tSKEWD232

Driver Skew (Figure 9)

RL = 3kΩ, CL = 50pF, (Slow Mode)

RL = 3kΩ, CL = 50pF, (Fast Mode)

±400

±100

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)

µs

tLZSD232, tHZSD232 Driver Output Disable into

Shutdown Time

485/232 = 0V, RL = 3kΩ, CL = 50pF,

SHDN ↓ (Figure 10)

0.6

µs

tPHLR232, tPLHR232 Receiver Propagation Delay

CL = 150pF (Figure 11)

200

tSKEWR232

Receiver Skew

CL = 150pF (Figure 11)

tRR232, tFR232

Receiver Output Rise or Fall Time

CL = 150pF (Figure 11)

200

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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