ST72C171 datasheet(125/152 Pages) STMICROELECTRONICS

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ST72C171

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EMC CHARACTERISTICS (Cont’d)

9.7.2 Absolute Electrical Sensitivity

Based on three different tests (ESD, LU and DLU)

using specific measurement methods, the product

is stressed in order to determine its performance in

terms of electrical sensitivity. For more details, re-

fer to the AN1181 ST7 application note.

9.7.2.1 Electro-Static Discharge (ESD)

Electro-Static Discharges (3 positive then 3 nega-

tive pulses separated by 1 second) are applied to

the pins of each sample according to each pin

combination. The sample size depends of the

number of supply pins of the device (3 parts*(n+1)

supply pin). Two models are usually simulated:

Human Body Model and Machine Model. This test

conforms to the JESD22-A114A/A115A standard.

See Figure 74 and the following test sequences.

Human Body Model Test Sequence

– CL is loaded through S1 by the HV pulse gener-

ator.

– S1 switches position from generator to R.

– A discharge from CL through R (body resistance)

to the ST7 occurs.

– S2 must be closed 10 to 100ms after the pulse

delivery period to ensure the ST7 is not left in

charge state. S2 must be opened at least 10ms

prior to the delivery of the next pulse.

Machine Model Test Sequence

– CL is loaded through S1 by the HV pulse gener-

ator.

– S1 switches position from generator to ST7.

– A discharge from CL to the ST7 occurs.

– S2 must be closed 10 to 100ms after the pulse

delivery period to ensure the ST7 is not left in

charge state. S2 must be opened at least 10ms

prior to the delivery of the next pulse.

– R (machine resistance), in series with S2, en-

sures a slow discharge of the ST7.

Absolute Maximum Ratings

Figure 74. Typical Equivalent ESD Circuits

Notes:

1. Data based on characterization results, not tested in production.

Symbol

Ratings

Conditions

Maximum value 1) Unit

VESD(HBM)

Electro-static discharge voltage

(Human Body Model)

TA=+25°C

2000

VESD(MM)

Electro-static discharge voltage

(Machine Model)

TA=+25°C

200

ST7

R=1500

Ω

HIGH VOLTAGE

CL=100pF

PULSE

GENERATOR

ST7

HIGH VOLTAGE

CL=200pF

PULSE

GENERATOR

HUMAN BODY MODEL

MACHINE MODEL

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