ST1284-02 查看數據表（PDF） - STMicroelectronics

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ST1284-02

PARALLEL PORT SINGLE TERMINATION NETWORK WITH ±15kV ESD PROTECTION

STMicroelectronics 

ST1284-xxA8

TECHNICAL INFORMATION

FREQUENCY BEHAVIOR OF DATA AND STROBE SIGNALS

Fig. A1: Measurement conditions.

Fig. A2: Typical frequency response curve for data

and strobe signals.

TRACKING

GENERATOR

50Ω

Vg

+5V

SPECTRUM

ANALYSER

ST1284

50Ω

Vin

Vout

0.00

dB

- 5.00

- 10.00

- 15.00

- 20.00

- 25.00

- 30.00

1

3

1284 - 01

1284 - 03

10

30

100

300

1,000

F (MHz) 1284 - 02

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 IEC61000-4-2 and is already in place in Europe.

This test requires that a device tolerates ESD events and remain operational without user intervention.

The ST1284-xxA8 is particularly optimized to perform ESD protection. ESD protection is based on the use

of device which clamps at :

Vouput = VBR + Rd.IPP

This protection function is splitted in 2 stages. As shown in figure A3, the ESD strikes are clamped by the

first stage S1 and then its remaining overvoltage is applied to the second stage through the resistor R.

Such a configuration makes the voltage very low at the output.

Fig. A3: ST1284 ESD clamping behavior.

Rg

S1

R

S2

ESD Surge

Rd

Vinput

Rd

VBR

Voutput

VBR

ST1284-xxA8

Rload

Device

to be

protected

4/6

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