LTC2801_15 Datasheet, PDF (12/18 Pages) Linear Technology – 1.8V to 5.5V RS-232 Single and Dual Transceivers

LTC2801/LTC2802/
LTC2803/LTC2804
Typical Applications
1.8V TO 5.5V
RA ON
5
V_CC
12
V_L
11
MODE
10
PS
13 T2IN
LTC2803
T2OUT 4
14 T1IN
T1OUT 3
15 R2OUT
R2IN 2
16 R1OUT
R1IN 1
GND
8
2801 F10
Figure 10. Power-Saving Receivers-Active Mode
1.8V TO 5.5V
CELL PHONE
V_BATT
RTS
TD
CTS
RD
5 V_CC
12 V_L
10 PS
LTC2804
11 MODE
13 T2IN
T2OUT 4
14 T1IN
T1OUT 3
15 R2OUT
R2IN 2
16 R1OUT
R1IN 1
GND
8
PERIPHERAL
RTS
TD
CTS
RD
2801 F11
Figure 11. Cellphone Peripheral Interface
5V
3
1.8V
V_CC
10
V_L
LTC2801
8
PS
9
MODE
µP
11 TIN
TOUT 2
12 ROUT
GND
6
RIN 1
2801 F12
3V
3
5V
V_CC
10
V_L
LTC2802
8
PS
9
MODE
µP
11 TIN
TOUT 2
12 ROUT
GND
6
RIN 1
2801 F13
1.8V TO 5.5V
5
V_CC
12
V_L
LTC2804-1
OFF ON
11
ON/OFF
13 T2IN
14 T1IN
15 R2OUT
16 R1OUT
T2OUT 4
T1OUT 3
R2IN 2
R1IN 1
GND
8
2801 F14
Figure 12. 1.8V Microprocessor Interface
Figure 13. 5V Microprocessor Interface Figure 14. Power-Saving Shutdown Mode
1.8V TO 5.5V
3
V_CC
10
V_L
8
PS
LTC2802
9
RT
MODE
11 TIN
TOUT 2
12 ROUT
GND
6
RIN 1
2801 F15
1.8V TO 5.5V
3
V_CC
10
V_L
8
PS
LTC2802
9
RT
MODE
11 TIN
TOUT 2
3.3k
12 ROUT
GND
6
RIN 1
2801 F16
1.8V TO 5.5V
5
V_CC
12
V_L
10
PS
LTC2803
11
RT
MODE
13 T2IN
T2OUT 4
3.3k _{15 R2OUT}
R2IN 2
14 T1IN
3.3k _{16 R1OUT}
T1OUT 3
R1IN 1
GND
8
2801 F17
Figure 15. Half-Duplex on Single Line,
Separate ROUT, TIN
12
Figure 16. Half-Duplex on Single Line
Figure 17. Half-Duplex Dual Transceiver
2801234fe