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AS2701A

AS-Interface Slave IC

austriamicrosystems AG 

AS-Interface Slave IC

AS2701A (ISA3+)

e) Interface to the ext. E 2PROM (U5R, SCL, SDA) / functional,

electrical and timing characteristics

Symbol Parameter

VU5R Output Voltage to E2PROM

CU5R Load Capacity to U5R

IU5R

Output Current to U5R

VOL

Output Voltage “Low”

VOH

Output Voltage “High”

VIL

Input Voltage “Low”(only SDA)

VIH

Input Voltage “High”(only SDA)

tDATAinSU

tDATAinHO

Set-up Time for Data Input

Hold Time for Data Input

tAA

tDATAoutHO

tSTARTSU

tSTARTHO

Time from SCK Low to SDA

Data Out and ACK Out

Hold Time for Data Output

Set-up Time for Start Condition

Hold Time for Start Condition

tSTOPSU

tBUF

tR

tF

Set-up Time for Stop Condition

Time which has to be Free for

Bus: Before Next Transmission

Rise Time

Fall Time

tLOW

tHIGH

tSCL

Impulse LOW Time

Impuls HIGH Time

Clock Frequency for E2PROM

min

4.5

10

0

0.8 * VU5R

-0.3

0.7 * VU5R

0.25

0

0.3

4.7

4

4.7

4.7

4700

4000

max

Unit

5.5

V

220

nF

3

mA

0.2 * VU5R V

VU5R

V

0.3 * VU5R V

VU5R + 0.3 V

µs

µs

3.5

µs

µs

µs

µs

µs

µs

1000

ns

300

ns

ns

ns

100

kHz

Note

IU5R ≤ 3 mA

Ceramics capacitor

IOL = 10 µA

-IOH = 10 µA

-IIL = 1.5… 0.2mA

IIH = -1… 1 µA

fc = 5.333 MHz

SCL

SDA in

SDA out

tF

tLOW

tHIGH

tSTARTSU

tSTARTHO

tR

tDATAinHO

tDATAinSU

tF

tAA

tDATAoutHO

tSTOPSU

tBUF

tR

The U5R supply pin provides a typically 5V supply voltage to the external E2PROM, and has a

biasing capability only for this purpose.

Programming of the E2PROM is possible with the E2PROM soldered-in into the AS-Interface

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

hardware.

Rev. C, October 2000

Page 10 of 16

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