TDA8000 查看數據表（PDF） - Philips Electronics

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产品描述 (功能)

生产厂家

TDA8000

Smart card interface

Philips Electronics 

Philips Semiconductors

Smart card interface

Product specification

TDA8000; TDA8000T

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX. UNIT

t5

tst

td(clk)

end of the window for sending CLK see Fig.6

to the card

maximum pulse width on START

before VCC starts rising

delay between RSTIN and CLK

see Fig.6

160

−

−

µs

−

−

30

µs

−

−

2

µs

Notes

1. START, WRITE, CLKDIV and PRES are active LOW; RSTIN and PRES are active HIGH.

2. The transition time and duty factor definitions are shown in Fig.12; δ = -t-1----t+--1---t--2- .

3. P is the card programming voltage set by pins PSEL1 and PSEL2.

4. This condition ensures correct start-up of the oscillator with crystals having series resistance up to 100 Ω.

5. The path between I/O and I/O(µC) is as follows (see Fig.13):

a) Clamp to VCC.

b) 20 kΩ pull-up resistor to VCC; thus VOH on I/O.

c) Two opposite npn transistors with sensing pnp transistor.

d) Clamp to VSUP; thus VOH on I/O(µC).

e) The base current of the npn transistor is decreasing when their collector current increases. This means the

voltage drop is very low for small currents and becomes maximum for some mA. Thus VOL on I/O and I/O(µC),

current limits, and high impedance feature. The output current from I/O and I/O(µC) when the line is open-circuit

is the sum of the pull-up current and the base currents.

handbook, full pagewidth

tr

90%

10%

t1

tf

90%

10%

t2

Fig.12 Definition of transition times.

VOH

1.5 V

VOL

MBH856

1996 Dec 12

16

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