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SI4704-C40-GM

BROADCAST FM RADIO RECEIVER FOR CONSUMER

Silicon Laboratories 

Si4704/05-C40

Table 5. 2-Wire Control Interface Characteristics1,2,3

(VDD = 2.7 to 5.5 V, VIO = 1.85 to 3.6 V, TA = –20 to 85 °C)

Parameter

SCLK Frequency

SCLK Low Time

SCLK High Time

SCLK Input to SDIO  Setup

(START)

SCLK Input to SDIO  Hold

(START)

SDIO Input to SCLK  Setup

SDIO Input to SCLK  Hold 4, 5

SCLK Input to SDIO  Setup

(STOP)

STOP to START Time

SDIO Output Fall Time

Symbol Test Condition

Min

Typ

fSCL

tLOW

tHIGH

tSU:STA

0

—

1.3

—

0.6

—

0.6

—

tHD:STA

0.6

—

tSU:DAT

tHD:DAT

tSU:STO

100

—

0

—

0.6

—

tBUF

tf:OUT

1.3

—

—

20

+

0.1

--C-----b---

1pF

Max

Unit

400

kHz

—

µs

—

µs

—

µs

—

µs

—

ns

900

ns

—

µs

—

µs

250

ns

SDIO Input, SCLK Rise/Fall Time

tf:IN

tr:IN

—

20

+

0.1

--C-----b---

1pF

300

ns

SCLK, SDIO Capacitive Loading

Cb

—

—

50

pF

Input Filter Pulse Suppression

tSP

—

—

50

ns

Notes:

1. When VIO = 0 V, SCLK and SDIO are low impedance.

2. When selecting 2-wire mode, the user must ensure that a 2-wire start condition (falling edge of SDIO while SCLK is

high) does not occur within 300 ns before the rising edge of RST.

3. When selecting 2-wire mode, the user must ensure that SCLK is high during the rising edge of RST, and stays high

until after the first start condition.

4. The Si4704/05 delays SDIO by a minimum of 300 ns from the VIH threshold of SCLK to comply with the minimum

tHD:DAT specification.

5. The maximum tHD:DAT has only to be met when fSCL = 400 kHz. At frequencies below 400 KHz, tHD:DAT may be

violated as long as all other timing parameters are met.

Rev. 1.0

7

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