LB180 View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

LB180

LOW-POWER RS-485 LINE DRIVER AND RECEIVER PAIRS

Unspecified 

SN55LBC180

SN65LBC180

SN75LBC180

SLLS174G – FEBRUARY 1994 – REVISED APRIL 2009................................................................................................................................................... www.ti.com

PARAMETER MEASUREMENT INFORMATION (continued)

1.5 V

S1

− 1.5 V

Generator

(see Note A)

A

B

RE

Input

50 Ω

Output

R

CL = 15 pF

(see Note B)

5 kΩ

2 kΩ

S2

5V

IN916 or Equivalent

(4 places)

S3

TEST CIRCUIT

Input

Output

tPZH

1.5 V

3V

S1 to 1.5 V

S2 Open

S3 Closed

0V

VOH

1.5 V

0V

Input

Output

3 V S1 to − 1.5 V

S2 Closed

1.5 V S3 Open

0V

tPZL

≈ 4.5 V

1.5 V

VOL

Input

1.5 V

tPHZ

Output

0.5 V

3V

S1 to 1.5 V

S2 Closed

S3 Closed

0V

Input

VOH

≈ 1.3 V

tPLZ

Output

VOLTAGE WAVEFORMS

1.5 V

0.5 V

3V

S1 to − 1.5 V

S2 Closed

S3 Closed

0V

≈ 1.3 V

VOL

NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR ≤ 1 MHz, 50% duty cycle, tr ≤ 6 ns, tf ≤ 6 ns,

ZO = 50 Ω.

B. CL includes probe and jig capacitance.

Figure 7. Receiver Output Enable and Disable Times

8

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