AS-Interface Slave IC

AS2701A (ISA3+)

Rev. C, October 2000

Page 7 of 16

c) Power Supply Pins LTGP and LTGN (LTGN = 0 V-reference)

The AS-Interface Slave IC's input at LTGP behaves as if a resistor RP and a (non-linear)

parallel capacitor CP connect LTGP to LTGN.

LTGP input impedance over frequency is as follows:

RP

CP

F

≥ 10 kOhm

≤35 pF

50 kHz

≥ 10 kOhm

≤45 pF

100 kHz

≥ 10 kOhm

≤48 pF

125 kHz

≥ 10 kOhm

≤51 pF

160 kHz

≥ 10 kOhm

≤54 pF

200 kHz

≥ 10 kOhm

≤60 pF

300 kHz

d) Data and Parameter Ports (D0...D3, DSTBn; P0...P3, PSTBn)

These pins are equipped with both an input and output channel as well as a current source

based pull-up structure; the I/O-circuit at these pins and their DC-characteristics @ output

channel 'Off' are described below.

The AS-Interface slave system concept requires D0...D3 and DSTBn to be bidirectional pins

and P0...P3 and PSTBn to be outputs.

The input channel on pins P0...P3 and PSTBn is only implemented to simplify the AS-Interface

Slave IC's device test, and is not intended to be used in AS-Interface Slave system applica-

tions.

11 µA typ

LTGN

D0..D3

DSTBn

P0..P3

PSTBn

U5R

0

-5

-10

-15

-20

4

0

10

20

30

40

VI[V]

II[µA]