LTC1387CSW datasheet(4/12 Pages) LINER

4 / 12 page

LTC1387

AC ELECTRICAL CHARACTERISTICS

TA = 25°C, VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF (Notes 2, 3), unless otherwise noted.

The q denotes specifications which apply over the full operating

temperature range.

Note 1: Absolute Maximum Ratings are those values beyond which the life

of the device may be impaired.

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.

Note 3: All typicals are given at VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF

and TA = 25°C.

Note 4: Short-circuit current for RS485 driver output low state folds back

above VCC. Peak current occurs around VO = 3V.

Note 5: SLEW includes an internal pull-up in RS485 mode.

PIN FUNCTIONS

C1+ (Pin 1): Commutating Capacitor C1 Positive Terminal.

Requires an external 0.1

µF capacitor between Pins 1 and 2.

C1– (Pin 2): Commutating Capacitor C1 Negative Terminal.

VDD (Pin 3): Charge Pump Positive Supply Output.

Requires an external 0.1

µF capacitor to ground.

A (Pin 4): Receiver Input A. Inverting input of RS232

receiver A in RS232 mode; inverting RS485 receiver input

in RS485 mode.

B (Pin 5): Receiver Input B. Inverting input of RS232

receiver B in RS232 mode; noninverting RS485 receiver

input in RS485 mode.

Y (Pin 6): Driver Output Y. Inverting RS232 driver Y output

in RS232 mode; inverting RS485 driver output in RS485

mode.

Z (Pin 7): Driver Output Z. Inverting RS232 driver Z output

in RS232 mode; noninverting RS485 driver output in

RS485 mode.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

RS485 Mode (Fast Slew Rate, ON = DXEN = High, 485/232 = High, SLEW = High)

tZL

Driver Enable to Output Low

Figures 3, 8, CL = 100pF, S1 Closed

tZH

Driver Enable to Output High

Figures 3, 8, CL = 100pF, S2 Closed

tLZ

Driver Disable from Low

Figures 3, 8, CL = 15pF, S1 Closed

tHZ

Driver Disable from High

Figures 3, 8, CL = 15pF, S2 Closed

RS485 Mode (Slow Slew Rate, ON = DXEN = High, 485/232 = High, SLEW = Low)

tPLH

Driver Input to Output

Figures 2, 7, RL = 54Ω, CL = 100pF

100

700

1500

tPHL

Driver Input to Output

Figures 2, 7, RL = 54Ω, CL = 100pF

100

700

1500

tSKEW

Driver Output to Output

Figures 2, 7, RL = 54Ω, CL = 100pF

200

750

tr, tf

Driver Rise or Fall Time

Figures 2, 7, RL = 54Ω, CL = 100pF

150

300

1500

tZL

Driver Enable to Output Low

Figures 3, 8, CL = 100pF, S1 Closed

600

1500

tZH

Driver Enable to Output High

Figures 3, 8, CL = 100pF, S2 Closed

600

1500

tLZ

Driver Disable from Low

Figures 3, 8, CL = 15pF, S1 Closed

100

200

tHZ

Driver Disable from High

Figures 3, 8, CL = 15pF, S2 Closed

100

200

RS485 Mode (ON = RXEN = High, 485/232 = High)

tPLH

Receiver Input to Output

Figures 2, 9, RL = 54Ω, CL = 100pF

140

tPHL

Receiver Input to Output

Figures 2, 9, RL = 54Ω, CL = 100pF

140

tSKEW

Differential Receiver Skew,

tPLH – tPHL

Figures 2, 9, RL = 54Ω, CL = 100pF

Receiver Output Enable/Disable (ON = High)

tZL

Receiver Enable to Output Low

Figures 6, 12, CL = 15pF, S1 Closed

tZH

Receiver Enable to Output High

Figures 6, 12, CL = 15pF, S2 Closed

tLZ

Receiver Disable from Low

Figures 6, 12, CL = 15pF, S1 Closed

tHZ

Receiver Disable from High

Figures 6, 12, CL = 15pF, S2 Closed

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