Rainbow-electronics AT83C24NDS Instrukcja Użytkownika Pobierz pdf (Strona 31)

4234F–SCR–10/05

AT83C24

Notes: 1. Capacitor: X7R type or X5R type, max ESR value is 30mΩ (100kHz-100MHz),

Replacing 3.3µF by 2.2µF in parrallel with 1µF is better for ESR and noise reduction.

Notes: 1. Capacitor: X7R type or X5R type, max ESR value is 30mΩ (100kHz-100MHz),

Replacing 3.3µF by 2.2µF in parrallel with 1µF is better for ESR and noise reduction.

VLH

CVCC 0 to Valid

140

110

130

100

250

μs

VCC = 3V, C

= 3.3µF

Icard = 65mA

Icard = 0mA

VCC = 3V, C

= 10µF

Icard = 60mA

Icard = 0mA

Table 22. Smart Card Class C

Symbol Parameter Min Typ Max Unit Test Conditions

Card Supply Current Capability 40 mA VCC = 3V

_ovf

Card Supply Current Overflow:

ICCADJ = 0 (reset value)

ICCADJ = 1

45 mA

Spikes on CVCC 1.68 1.92 V

Vcardok up Vcardok high level threshold 1.75 1.8 V

Vcardok

down

Vcardok low level threshold 1.7 1.75 V

VHL

CVCC valid to 0 180 300 μs

Icard = 0, C

= 10 μF

(1)

CVCC = 1.8V to 0.4V

VLH

CVCC 0 to valid

200

100

300

150

100

μs

Icard = 40mA, C

= 10 μF

(1)

Icard = 0, C

= 10 μF

(1)

Icard = 40mA, C

= 3.3 μF

(1)

Icard = 0, C

= 3.3 μF

(1)

CVCC = 0.4 to VCARDOK

Table 21. Smart Card Class B

Symbol Parameter Min Typ Max Unit Test Conditions

Table 23. Smart Card Clock (CCLK pin)

Symbol Parameter Min Typ Max Unit Test Conditions

Output Low-voltage 0 0.4 V

= -200 μA CLASS

A&B&C

Output High Voltage

CVCC - 0.45

0.7CVCC

CVCC

= +200 μA CLASS

A&B

CLASS C

Short Circuit Current -30 30 mA Short to GND or CVCC

Rise and Fall time

22.5

L =

30 pF CLASS A

L =

30 pF CLASS B

L =

30 pF CLASS C

measurement between

10% and 90% of CVCC

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 41 42

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