AS-Interface Slave IC

AS2701A (ISA3+)

Rev. C, October 2000

Page 10 of 16

e) Interface to the ext. E

electrical and timing characteristics

Symbol

Parameter

min

max

Unit

Note

VU5R

Output Voltage to E

4.5

5.5

V

IU5R

≤3 mA

CU5R

Load Capacity to U5R

10

220

nF

Ceramics capacitor

IU5R

Output Current to U5R

3

mA

VOL

Output Voltage “Low”

0

0.2 * VU5R

V

IOL = 10 µA

VOH

Output Voltage “High”

0.8 * VU5R

VU5R

V

-IOH = 10 µA

VIL

Input Voltage “Low”(only SDA)

-0.3

0.3 * VU5R

V

-IIL = 1.5… 0.2mA

VIH

Input Voltage “High”(only SDA)

0.7 * VU5R

VU5R + 0.3

V

IIH = -1… 1 µA

Set-up Time for Data Input

0.25

µs

Hold Time for Data Input

0

µs

Time from SCK Low to SDA

Data Out and ACK Out

3.5

µs

Hold Time for Data Output

0.3

µs

Set-up Time for Start Condition

4.7

µs

Hold Time for Start Condition

4

µs

Set-up Time for Stop Condition

4.7

µs

Time which has to be Free for

Bus: Before Next Transmission

4.7

µs

Rise Time

1000

ns

Fall Time

300

ns

Impulse LOW Time

4700

ns

Impuls HIGH Time

4000

ns

Clock Frequency for E

100

kHz

fc = 5.333 MHz

SCL

SDA in

SDA out

t

STARTSU

t

LOW

t

DATAinHO

t

DATAoutHO

t

DATAinSU

t

STARTHO

t

F

t

F

t

AA

t

HIGH

t

STOPSU

t

R

t

BUF

t

R

The U5R supply pin provides a typically 5V supply voltage to the external E

biasing capability only for this purpose.

Programming of the E

Slave unit's pc-board by accessing the SCL / SDA serial bus with an external programming

hardware.