SN75LP1185

LOW-POWER MULTIPLE RS-232 DRIVERS AND RECEIVERS

SLLS335A – JANUARY 1999 – REVISED JANUARY 2001

6

POST OFFICE BOX 655303

receiver switching characteristics over recommended operating free-air temperature range,

PARAMETER

MIN

TYP

MAX

UNIT

tPHL

Propagation delay time, high- to low-level output

400

900

ns

tPLH

Propagation delay time, low- to high-level output

400

900

ns

tTLH

Transition time, low- to high-level output

200

500

ns

tTHL

Transition time, high- to low-level output

200

400

ns

tSK(p)

Pulse skew |tPLH – tPHL|

200

425

ns

PARAMETER MEASUREMENT INFORMATION

IO

II

RL

CL

VI

VO

Inputs

Outputs

tPLH

tPHL

tTLH

tTHL

3 V

0 V

VOH

VOL

VI

VO

50%

50%

50%

50%

VTR+ VTR+

VTR–

VTR–

tw

NOTES: A. The pulse generator has the following characteristics:

For CL < 1000 pF: tw = 4 µs, PRR = 250 kbit/s, ZO = 50 Ω, tr and tf < 50 ns.

For CL = 2500 pF: tw = 8 µs, PRR = 125 kbit/s, ZO = 50 Ω, tr and tf < 50 ns.

B. CL includes probe and jig capacitance.

Figure 1. Driver Parameter Test Circuit and Waveform

IO

II

VI

VO

Inputs

Outputs

VDD

VCC

GND

VSS

IO

II

VI

VO

Inputs

Outputs