si2401 Silicon Laboratories, si2401 Datasheet - Page 9

• Manufacturer Part Number: si2401
• Description: V.22bis Isomodem With Integrated Global Daa
• Manufacturer: Silicon Laboratories

Table 6. Switching Characteristics
(V
Parameter
Baud Rate Accuracy
CTS ↓ Active to Start Bit↓
RESET Pulse Width
RESET ↑ to TXD ↓
Note: All timing is referenced to the 50% level of the waveform. Input test levels are V
D
8-Bit Data
Mode (Default)
9-Bit Data
Mode
8-Bit Data
Mode (Default)
9-Bit Data
Mode
CTS
= 3.0 to 3.6 V, T
RXD
RXD
TXD
TXD
t
csb
RESET
Note: Baud rates (programmed through register SE0) are as follows: 300,1200, 2400, 9600, 19200,
38400, 115200, and 307200 Hz.
TXD
t
sbc
A
Start
Start
Start
Start
= 0 to 70 °C
Figure 2. Asynchronous UART Serial Interface Timing Diagram
D0
D0
D0
D0
for F-Grade
D1
D1
D1
D1
)
Symbol
t
t
rs
rl
t
D2
D2
D2
D2
csb
t
t
rs
rl
Transmit Timing
Receive Timing
Rev. 1.0
D3
D3
D3
D3
Min
–1
10
1
3
D4
D4
D4
D4
D5
D5
D5
D5
Typ
—
—
—
—
IH
= 2.0 V, V
D6
D6
D6
D6
IL
D7
D7
D7
D7
Max
= 0.8 V
—
—
—
1
Stop
Stop
D8
D8
Si2401
Stop
Stop
Unit
ms
ms
ns
%
9