ST72311R datasheet(147/164 Pages) STMICROELECTRONICS

147 / 164 page

ST72311R, ST72511R, ST72512R, ST72532R

147/164

12.9 CONTROL PIN CHARACTERISTICS

12.9.1 Asynchronous RESET Pin

Subject to general operating condition for VDD,fOSC, and TA unless otherwise specified.

Figure 86. Typical Application with RESET pin 5)

12.9.2 VPP Pin

Subject to general operating condition for VDD,fOSC, and TA unless otherwise specified.

Figure 87. Two typical Applications with VPP Pin

Notes:

1. Unless otherwise specified, typical data are based on TA=25°C and VDD=5V.

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

3. Hysteresis voltage between Schmitt trigger switching levels. Based on characterization results, not tested.

4. The RON pull-up equivalent resistor is based on a resistive transistor. This data is based on characterization results,

not tested in production.

5. The reset network protects the device against parasitic resets, especially in a noisy environment.

6. Data based on design simulation and/or technology characteristics, not tested in production.

7. When the in-circuit programming mode is not required by the application VPP pin must be tied to VSS.

Symbol

Parameter

Condit ions

Min

Typ 1)

Max

Unit

VIL

Input low level voltage 2)

0.3xV

VIH

Input high level voltage 2)

0.7xV

Vhys

Schmitt trigger voltage hysteresis 3)

400

RON

Weak pull-up equivalent resistor 4)

VIN=VSS VDD=5V

Ω

tw(RSTL)out Generated reset pulse duration

Watchdog reset source

µs

th(RSTL)in External reset pulse hold time

µs

RESET

VDD

WATCHDOG RESET

ST72XXX

LVD RESET

INTERNAL RESET CONTROL

RON

0.1

µF

VDD

0.1

µF

VDD

4.7k

Ω

EXTERNAL

RESET

CIRCUIT

Symbol

Parameter

Conditio ns

Min

Max

Unit

VIL

Input low level voltage 6)

VSS

0.2

VIH

Input high level voltage 6)

VDD-0.1

12.6

VPP

ST72XXX

4.7k

Ω

PROGRAMMING

TOOL

VPP

ST72XXX

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