TDA8002CTSLASHASLASHC1 datasheet(10/28 Pages) PHILIPS

10 / 28 page

1999 Oct 12

Philips Semiconductors

Product speciﬁcation

IC card interface

TDA8002C

Table 1

Clock circuitry deﬁnition

Notes

1. X = don’t care.

2. In low-power mode.

3. fint = 32 kHz in low-power mode.

MODE

CLKSEL

CLKDIV1

CLKDIV2

FREQUENCY OF

CLK

FREQUENCY OF

CLKOUT

HIGH

LOW

HIGH

LOW

⁄2fint

HIGH

LOW

⁄4fxtal

fxtal

HIGH

LOW

HIGH

⁄2fxtal

fxtal

HIGH

LOW

HIGH

STOP low

fxtal

HIGH

X(1)

STROBE

fxtal

LOW(2)

X(1)

STOP low

⁄2fint(3)

I/O circuitry

The three I/O transceivers are identical. The state is HIGH

for all I/O pins (i.e. I/O, I/OUC, AUX1, AUX1UC, AUX2 and

AUX2UC). Pin I/O is referenced to VCC and pin I/OUC to

VDD, thus ensuring proper operation in the event that

VCC ≠ VDD.

The first side on which a falling edge is detected becomes

a master (input). An anti-latch circuitry first disables the

detection of the falling edge on the other side, which

becomes slave (output), see Fig.8.

After a delay time td (between 50 and 400 ns), the logic 0

present on the master side is transferred on the slave side.

When the input is back to HIGH level, a current booster is

turned on during the delay td on the output side and then

both sides are back to their idle state, ready to detect the

next logic 0 on any side.

In the event of a conflict, both lines may remain LOW until

the software enables the lines to be HIGH. The anti-latch

circuitry ensures that the lines do not remain LOW if both

sides return HIGH, regardless of the prior conditions.

The maximum frequency on the lines is approximately

200 kHz.

When CS is HIGH, I/OUC, AUX1UC and AUX2UC are

internally pulled-up to VDD with 20 kΩ resistors. When

CS is LOW, I/OUC, AUX1UC and AUX2UC are

permanently HIGH (with integrated 100 k

Ω pull-up

resistors connected to VDD).

Fig.8 Master and slave signals.

handbook, full pagewidth

MGD703

I/O

I/OUC

conflict

idle

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