F81438 Datasheet, PDF (6/20 Pages) Feature Integration Technology Inc. – Single 5V RS232/RS422/RS485 Multiprotocol

4.2. Transceiver
F81438
Pin
Pin
Name
Type
Single Ended
Description
Full-Duplex
Half-Duplex
T Driver
T Driver Enable
1
T1_IN
IN_t
T1 Driver input Enable Active
Active High, R
High
Enable Active Low
3
R5_IN
AIN/AOUT R5 Receiver Input
T(B) Driver
Output
R(B) Receiver Intput,
T (B) Output
4
R4_IN
AIN/AOUT R4 Receiver Input
T(A) Driver
Output
T(A) Driver Output,
R(A) Receiver Input
6
R1_IN
AIN
R1 Receiver Input
High
Impedance
High Impedance
7
T1_OUT
AOUT
T1 Driver Output
High
Impedance
High Impedance
15
R2_IN
AIN
R2 Receiver Input
High
Impedance
High Impedance
16
R3_IN
AIN
R3 Receiver Input
High
Impedance
High Impedance
17
T2_OUT
AIN
T2 Driver Output
R(A) Receiver
Input
High Impedance
18
T3_OUT
AIN
T3 Driver Output
R(B) Receiver
Input
High Impedance
19
R2_OUT
O₄
R2 Reveiver Output High
20
R3_OUT
O₄
R3 Receiver Output High
21
R4_OUT
O₄
R4 Receiver
Output
R Receiver
Output
R Receiver Output
High
22
R5_OUT
O₄
R5 Receiver
Output
High
Impedance
R Receiver Output
High
26
R1_OUT
O₄
27
T3_IN
IN_t
R1 Receiver Output High
T3 Driver Input
High
Impedance
High Impedance
28
T2_IN
IN_t
T2 Driver Input T Driver Input
T Driver Input
4.3. Charge Pump, Mode Select & Other Functions
Pin
Pin Name
Type
Description
9
C1+
Pump Positive terminal of the flying capacitor
10
V+
Pump VDD storage capacitor
11
C2+
Pump Positive terminal of negative flying capacitor
12
C1-
Pump Negative terminal of positive flying capacitor
13
C2-
Pump Negative terminal of positive flying capacitor
14
V-
Pump VSS Storage capacitor
2
MODE_1
INt Mode selection pin-1
23
MODE_2
IN_t Mode selection pin-2
24
SD
IN_t
Shutdown pin.
25
SLEW
IN_{t,pu 8uA}
Slew rate control pin, Logical Low input will limit driver
slew from either RS-232 to 1Mbps or RS-485 to 10Mbps
6
Jan, 2012
V0.11P