www.ti.com

100

150

200

50

0

1.5

1.0

0.5

0.0

DUT = 10-V 1-

Ω Zener Diode

Time (ns)

Machine Model (MM)

TRS207

5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER

WITH

±15-kV ESD PROTECTION

SLLS809 – JUNE 2007

APPLICATION INFORMATION (continued)

Figure 6. Typical HBM Current Waveform

The MM ESD test applies to all pins using a 200-pF capacitor with no discharge resistance. The purpose of the

MM test is to simulate possible ESD conditions that can occur during the handling and assembly processes of

manufacturing. In this case, ESD protection is required for all pins, not just RS-232 pins. However, after PC

board assembly, the MM test is no longer as pertinent to the RS-232 pins.

9

Submit Documentation Feedback