CDC319

1-LINE TO 10-LINE CLOCK DRIVER

WITH I2C CONTROL INTERFACE

SCAS590A – DECEMBER 1997 – REVISED OCTOBER 2001

9

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

PARAMETER MEASUREMENT INFORMATION

DUT

RL = 1 kΩ

VO = 3.3 V

CL = 10 pF or

CL = 400 pF

GND

tsu(START)

t(BUS)

tr(SDATA)

th(START)

tsu(SDATA)

th(SDATA)

tf

tr

tw(SCLL)

tw(SCLH)

tsu(START)

tPHL

tPLH

0.7 VCC

0.3 VCC

0.7 VCC

0.3 VCC

Stop Condition

tsu(STOP)

Repeat Start

Condition

(see Note A)

Start or

Repeat Start

Condition

SCLOCK

SDATA

Start

Condition

(S)

Bit 7

MSB

Bit 6

Bit 0

LSB

(R/W)

Acknowledge

(A)

Stop

Condition

(P)

4 to 6 Bytes for Complete Device

Programming

TEST CIRCUIT

VOLTAGE WAVEFORMS

tf(SDATA)

BYTE

DESCRIPTION

1

I2C address

2

Command (dummy value, ignored)

3

Byte count (dummy value, ignored)

4

I2C data byte 0

5

I2C data byte 1

6

I2C data byte 2

NOTES: A. The repeat start condition is not supported.

B. All input pulses are supplied by generators having the following characteristics: PRR

≤ 100 kHz, ZO = 50 Ω, tr ≥ 10 ns, tf ≥ 10 ns.

Figure 3. Propagation Delay Times, tr and tf