Feature compatibility

AN2366

4/8

Doc ID 12345 Rev 2

2

Feature compatibility

2.1

Some timing differences exist between the products (see Table 3). The application must

ensure that the power supply ramps up within the time window specified for the

microcontroller if LVD is ON.

2.2

Asynchronous RESET pin

respectively (see Table 4).

2.3

Oscillator pad

The ST72324B (32K Flash and ROM devices only) features a new oscillator pad which is

more tolerant of the crystal type and is not disturbed if the oscillator pins are left

unconnected. When migrating to these devices, the MCU needs to be validated with your

existing resonator / crystal.

Table 3.

Symbol

Description

Device

Conditions

Min

Max

ST72324

LVD on

6µs/V

Infinite ms/V

ST72324B (8K and 16K)

20ms/V

ST72324B (32K)

Infinite ms/V

ST72F324, ST72F324B

100ms/V

Table 4.

RESET pin characteristics

ST72F324, ST72324

ST72F324B, ST72324B

Min

Max

Min

Max

-