SN75LP1185

LOW-POWER MULTIPLE RS-232 DRIVERS AND RECEIVERS

SLLS335 – JANUARY 1999

7

POST OFFICE BOX 655303

PARAMETER MEASUREMENT INFORMATION

IO

II

CL

VI

VO

Inputs

Outputs

tPLH

tPHL

tTLH

tTHL

4 V

0 V

VOH

VOL

VI

VO

50%

50%

50%

50%

90%

90%

10%

10%

tw

NOTES: A. The pulse generator has the following characteristics: tw = 4 µs, PRR = 250 kbit/s, ZO = 50 Ω, tr and tf < 50 ns.

B. CL includes probe and jig capacitance.

Figure 4. Receiver Parameter Test Circuit and Waveform

IO

II

VI

VO

Inputs

Outputs

VCC

GND

APPLICATION INFORMATION

outputs are shorted to

±15 V and the power supplies are at low voltage and provide low-impedance paths to ground

(see Figure 6).

SN75LP1185

Output

SN75LP1185

Output

VDD

VSS

Figure 6. Power-Supply Protection to Meet Power-Off Fault Conditions of TIA/EIA-232-F