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SI2401

V.22BIS ISOMODEM® WITH LOW-COST DAA

Silicon Laboratories 

Si2401/Si3008

Table 6. Switching Characteristics

(VD = 3.0 to 3.6 V, TA = 0 to 70 °C for F-Grade)

Parameter

Symbol

Min

Typ

Max

Baud Rate Accuracy

–1

—

1

CTS ↓ Active to Start Bit↓

RESET Pulse Width

RESET ↑ to TXD ↓

tcsb

10

—

—

trl

1

—

—

trs

3

—

—

Note: All timing is referenced to the 50% level of the waveform. Input test levels are VIH = 2.0 V, VIL = 0.8 V

Unit

%

ns

ms

ms

Receive Timing

RXD

8-Bit Data

Start

D0

D1

D2

D3

D4

D5

D6

D7

Stop

Mode (Default)

RXD

9-Bit Data

Start

D0

D1

D2

D3

D4

D5

D6

D7

D8 Stop

Mode

TXD

Transmit Timing

8-Bit Data

Start

D0

D1

D2

D3

D4

D5

D6

D7 Stop

Mode (Default)

TXD

9-Bit Data

Start

D0

D1

D2

D3

D4

D5

D6

D7

D8 Stop

Mode

tcsb

tsbc

CTS

RESET

trl

TXD

trs

Note: Baud rates (programmed through register SE0) are as follows: 300,1200, 2400, 9600, 19200,

38400, 115200, and 307200 Hz.

Figure 2. Asynchronous UART Serial Interface Timing Diagram

8

Rev. 1.1

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