Rainbow-electronics AT83C24NDS Bedienungsanleitung PDF herunterladen (Seite 29)

4234F–SCR–10/05

AT83C24

Output Low-voltage (I/O, C4, C8, PRES/INT)

0.05

0.4

= -100 μA

OL =

-1.2 mA

Output High Voltage (C4, C8, PRES/INT)

on I/O depends on external pull up value

0.8 x EVCC EVCC V

EVCC from 1.6V to VCC

= 100 μA

Extra Supply Current +3 mA C

= 100 nF

PRES/INT

PRES/INT weak pull-up output current 300 330 360 κΩ

Short to VSS

INT_PULLUP = 0: Internal

pull-up active.

EVCC EVCC pin not connected to a power supply Vpeak - 10 mV Vpeak Vpeak + 25 mV V

= 100 nF, EIcc = +3

Vpeak on I/O from 1.6V to

VCC

EAUTO = 1:

min duration 1µs,

min frequency 0.1Hz,

spikes <50ns are filtered.

EVCC EVCC pin connected to a power supply

Vpeak -

200mV

EAUTO = 1

CLK Clock signal for AT83C24 4 48 MHz

If DCK[2:0] =0

(CLK=4MHz to 4.61MHz),

a duty cycle of 50% is

needed.

CLK Clock signal for AT83C24NDS 18 48 MHz

no constrainst on duty

cycle

Table 18. Host Interface (I/O, C4, C8, CLK, A2, A1, A0, CMDVCC, PRES/INT) (Continued)

Symbol Parameter Min Typ Max Unit Test Conditions

Table 19. Host Interface (SCL, SDA, RESET)

Symbol Parameter Min Typ Max Unit Test Conditions

Input Low-voltage -0.5

1.9

0.3 x VCC

VCC > 4.5V

VCC <= 4.5V

Input High Voltage

0.7 x VCC

VCC + 0.5 V

VCC > 4.5V

VCC <= 4.5V

Output Low-voltage 0.4 V I

= -3 mA

HIST

Input trigger hysteresis 0.1 x VCC

Table 20. Smart Card Class A

Symbol Parameter Min Typ Max Unit Test Conditions

Card Supply Current Capability 65

VCC=3V to 5.5V,

STEPREG=0

VCC > 5.35V, STEPREG = 1

_ovf

Card Supply Current Overflow:

ICCADJ = 0 (reset value)

ICCADJ = 1

120

130

150

mA VCC from 3 to 5.5V

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 41 42

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