Technical information

ST1284

6/10

Doc ID 6976 Rev 4

3

Technical information

3.1

Frequency behavior of data and strobe signals

3.2

ESD protection

In addition to the requirements of termination and EMC compatibility, computing devices are

required to be tested for ESD susceptibility. This test is described in the IEC 61000-4-2 and

is already in place in Europe. This test requires that a device tolerates ESD events and

remain operational without user intervention.

The ST1284-01A8 is particularly optimized to perform ESD protection. ESD protection is

based on the use of device which clamps at:

This protection function is split in 2 stages. As shown in Figure 7, the ESD strikes are

stage through the resistor R. Such a configuration makes the voltage very low at the output.

Figure 7.

ST1284 ESD clamping behavior

Figure 5.

Measurement conditions

Figure 6.

Typical frequency response curve

for data and STROBE signal

ST1284

SPECTRUM

ANALYSER

TRACKING

GENERATOR

Vg

Vout

Vin

50

Ω

50

Ω

+5V

1

3

10

30

100

300

1,000

-30.00

-25.00

-20.00

-15.00

-10.00

-5.00

0.00

dB

F (MHz)

ESD Surge

Vinput

Voutput

Rload

Rg

R

S1

Rd

V

BR

V

BR

Device

to be

protected

ST1284-xxA8

Rd

S2