ST92F120JR9T datasheet(12/320 Pages) STMICROELECTRONICS

12 / 320 page

12/320

ST92F120 - GENERAL DESCRIPTION

voltage drop across the SCR parasitic resistor, the

SCR may be turned on; to turn off the SCR it is

necessary to remove the power supply from the

device.

The present ST9 design implements layout and

process solutions to decrease the effects of elec-

trostatic discharges (ESD) and latchup. Of course

it is not possible to test all devices, due to the de-

structive nature of the mechanism; in order to

guarantee product reliability, destructive tests are

carried out on groups of devices, according to

STMicroelectronics internal Quality Assurance

standards and recommendations.

1.2.4.2 Protective Interface

Although ST9 input/output circuitry has been de-

signed taking ESD and Latchup problems into ac-

count, for those applications and systems where

ST9 pins are exposed to illegal voltages and high

current injections, the user is strongly recommend-

ed to implement hardware solutions which reduce

the risk of damage to the microcontroller: low-pass

filters and clamp diodes are usually sufficient in

preventing stress conditions.

The risk of having out-of-range voltages and cur-

rents is greater for those signals coming from out-

side the system, where noise effect or uncon-

trolled spikes could occur with higher probability

than for the internal signals; it must be underlined

that in some cases, adoption of filters or other ded-

icated interface circuitries might affect global mi-

crocontroller performance, inducing undesired tim-

ing delays, and impacting the global system

speed.

Figure 4. Digital Input/Output - Push-Pull

OUTPUT

BUFFER

INPUT

BUFFER

ESDPROTECTION

CIRCUITRY

PORTCIRCUITRY

I/OCIRCUITRY

ST92F120JR9T 数据表(PDF) 12 Page - STMicroelectronics

ST92F120JR9T 数据表(HTML) 12 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载