STR720 datasheet(386/401 Pages) STMICROELECTRONICS

386 / 401 page

STR720 - ELECTRICAL CHARACTERISTICS

386/401

interface timing characteristics, see Section 28.12:

External Memory Bus Timing on

page 393

VDD(all) = 1.80 V ± 10%, VDD3(all) = 3.30 V ± 10%, TA = -40 / +85 °C unless otherwise specified.

Data based on design guidelines and validation, not tested in production.

28.9 Asynchronous Reset Input Characteristics

All reset input pins implement a low-pass glitch filter which improves their noise immunity and

prevents system from malfunctioning as it would happen if they got activated inappropriately.

The electrical characteristics of these special pins, both static and dynamic, are reported in

Table 101. It must be noted that input characteristics of RSTIN ad RTCRST are different from

standard I/Os, due to the fact that they are supplied at 1.8 V by VDDRTC and they have to

tolerate 3.3 V input signals even when no such voltage is applied to STR720 device

(STANDBY mode).

VDD(all) = 1.80 V ± 10%, VDD3(all) = 3.30 V ± 10%, TA = -40 / +85 °C unless otherwise specified.

Table 100. AC Electrical Characteristics

Symbol

Parameter

Test Conditions(1)

Value

Unit

Min.

Typ

Max

TTR

Output transition time

(10%-90% and 90%-10%)

P2(15:0), P3(12:0), P4(3:0)(2)

CL = 50pF

Output transition time

(10%-90% and 90%-10%)

P4(4),P7(43:0),

JTDO, JTCK(2)

CL = 50pF

2.5

Output transition time

(10%-90% and 90%-10%)

P6(59:47,45:0)(2)

CL = 30pF

Table 101. Reset pads input filter characteristics

Symbol

Parameter

Test Conditions(1)

Value

Unit

Min

Typ

Max

VIL

Input low level TTL Schmitt

trigger (JTRST)

0.8

Input low level Schmitt trigger

(RSTIN, RTCRST)

0.43

0.5

0.65

VIH

Input high level TTL Schmitt

trigger (JTRST)

2.0

Input high level Schmitt trigger

(RSTIN, RTCRST)

0.72

0.9

0.98

VHYS

Input hysteresis TTL Schmitt

trigger (JTRST)

0.4

Input hysteresis Schmitt trig-

ger (RSTIN, RTCRST)

tFRS

Input filtered pulse

JTRST, RSTIN, RTCRST

tNFR

Input not filtered pulse

JTRST, RSTIN, RTCRST

500

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