AN1181/0100 1/7

AN1181

APPLICATION NOTE

ELECTRO STATIC DISCHARGE SENSITIVITY

MEASUREMENT

by Microcontroller Division Applications

This application note describes a procedure for determ inin g the susceptibility of microcon-

troller devices to ESD damage.

1 REFERENCE DOCUMENTS

1.1 REFERENCE DOCUMENTS (INTERNAL ST REFERENCES)

■ 0061 692 "Reliability Test Specification for Product Qualification"

■ S OP2614 " Reliability Procedure for Product Qualification"

1.2 OTHER REFERENCES

■ CDF-AEC-Q100-002 "Human Body Model ESD test"

■ CD F-AEC-Q100-003 "Machine Model ESD test"

■ ESD Association standard draft DS5.3 - 1993 Draft Standard for ESD sensitivity text-

Charged D evice Model (CDM) Component Testing

■ ESD Association standard draft DS5.3.1 - 1996 Charged Device Model (CDM) Non-

Socketed M ode

■ JED EC STAND AR D JESD22-C101 "Field- induced Charged Device Model"

■ JED EC STAND AR D JESD22-A114A "Hum an Body Model"

■ JED EC STAND AR D JESD22-A115A "Machine M odel"

■ E SD Association standard draft DS5.2 - 1996 "Machine Model"

■ E SD Association Standard ESD S TM 5.1 - 1998 " Human Body Model"

■ E IAJ Provisional Standard EDX-4702 " C harged Device Model"

2/7

ELECTROSTATIC DISCHARGE SENSITIVITY MEASUREMENT

2 DEFIN ITI ONS

– DUT (Device under test): a product evaluated for its sensitivity to ESD

– ESD (Electrostatic discharge): the transfer of electrostatic charge between bodies at differ-

ent electrostatic potentials

– Electrostatic Discharge Sensitivity: an ESD voltage level which causes part failure

– ESD simulator: an instrument tha t simulates the models described in this specification

– Human Body Model (HBM) ESD: an E SD pulse simulating the human body discharge to a

device

– Machi ne Model ( MM) ESD: an ESD pul se approximat ing a pulse fr om a machine or mechan-

ical equipment

– Maximum Withstanding Voltage: the maximum ESD voltage at which the product passes the

failure criteria requirements specified in Section 4.

– PUT: pin under test

– Non-supply Pins: all input, output, bi-directional and clock pins except power pins and non

connected pins.

– Power Pins all power supply, external voltage source and ground pins

– Like-named Power Pins: Power Pins with similar names and functions. i.e. VDD1 - VDD2,

VCC1 - VCC2, GN D1 - GND2.

– Ringing current: the damped high frequency current oscillation usually following the pulse

rise t ime

3 GENERAL

■ ESD pulse simulator and DUT

■ For HBM see FIGURE 1

■ For MM see FIGURE 2

3.1 MEASUREMENT EQUIPMENT

3.1.1 For H BM an d MM

An oscilloscope and current probe with a minimum bandwidth of 350 M Hz.

Maximum cable length of current probe is 1 meter.

– Evaluation loads:

a) low inductance, 1000 Volt, 500 ohm +/- 1% sputtered film resistor

b) tinned copper shorting wire