ST72324BJ2 datasheet(137/188 Pages) STMICROELECTRONICS

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ST72324B

Electrical characteristics

137/188

12.1.5

Pin input voltage

The input voltage measurement on a pin of the device is described in Figure 63.

Figure 63.

Pin input voltage

12.2

Absolute maximum ratings

Stresses above those listed as “absolute maximum ratings” may cause permanent damage

to the device. This is a stress rating only and functional operation of the device under these

conditions is not implied. Exposure to maximum rating conditions for extended periods may

affect device reliability.

12.2.1

Voltage characteristics

VIN

ST7 pin

Table 82.

Voltage characteristics

Symbol

Ratings

Maximum value

Unit

VDD - VSS

Supply voltage

6.5

VPP - VSS

Programming voltage

VIN

(1)(2)

Directly connecting the RESET and I/O pins to VDD or VSS could damage the device if an unintentional

internal reset is generated or an unexpected change of the I/O configuration occurs (for example, due to a

corrupted program counter). To guarantee safe operation, this connection has to be done through a pull-up

or pull-down resistor (typical: 4.7k

Ω for RESET, 10kΩ for I/Os). For the same reason, unused I/O pins

must not be directly tied to VDD or VSS.

IINJ(PIN) must never be exceeded. This is implicitly ensured if VIN maximum is respected. If VIN maximum

cannot be respected, the injection current must be limited externally to the IINJ(PIN) value. A positive

injection is induced by VIN > VDD while a negative injection is induced by VIN < VSS. For true open-drain

pads, there is no positive injection current, and the corresponding VIN maximum must always be

respected.

Input voltage on true open drain pin

VSS - 0.3 to 6.5

Input voltage on any other pin

VSS - 0.3 to

VDD +0.3

∆VDDx| and |∆VSSx| Variations between different digital power pins

|VSSA - VSSx|

Variations between digital and analog ground pins

VESD(HBM)

Electrostatic discharge voltage (human body model)

see Section 12.8.3 on

page 152

VESD(MM)

Electrostatic discharge voltage (machine model)

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