AT83C24B datasheet(33/42 Pages) ATMEL

33 / 42 page

4234F–SCR–10/05

AT83C24

Table 25. Smart Card RST (CRST pin)

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

Output Low-voltage

0.12 x CVCC

0.4

0.2

OL = -20 µA CLASS

A&B&C

OL = -200 µA CLASS A

OL = -200 µA CLASS

B&C

Output High Voltage

0.9*CVCC

CVCC

OH = 200 µA

CLASS A&B&C

Output High Current

-15

+15

Short to GND or CVCC

R tF

Rise and Fall time

0.1

µs

L = 30pF

measurement between

10% and 90% of CVCC

Low level voltage stability

(taking into account PCB design)

-0.25

0.50V

0.30V

CLASS A

CLASS B

CLASS C

High level voltage stability

(taking into account PCB design)

4.2

2.35

CVCC-0.4

CVCC+0.25

CLASS A

CLASS B

CLASS C

Table 26. Card Presence

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

CPRES

CPRES weak pull-up output current

300

330

360

κΩ

Short to VSS

PULLUP = 1:

Internal pull-up active

Table 27. TWI (SDA, SCL pins)

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

SU;DAT

Data set-up time

Not tested

HD;DAT

Data hold time

Not tested

fDA

Fall time on SDA signal

Not tested

AT83C24B Datasheet(PDF) 33 Page - ATMEL Corporation

AT83C24B Datasheet(HTML) 33 Page - ATMEL Corporation

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