LTC2846 Linear Technology, LTC2846 Datasheet - Page 7

• Manufacturer Part Number: LTC2846
• Description: 3.3V Software-Selectable Multiprotocol Transceiver with Termination
• Manufacturer: Linear Technology

www.DataSheet4U.com
DataSheet U .com
PI FU CTIO S
NC (Pin 1): No Connect.
PGND (Pin 2): Boost Switching Regulator Power Ground.
Tie PGND to SGND.
V
switching regulator. 3V V
capacitor to ground.
SHDN (Pin 4): Boost Switching Regulator Shutdown Pin.
Tie to 2.4V or more to enable regulator. Ground to shut
down.
C1
1 F capacitor between C1
C1
1 F capacitor between C1
V
V.28. Connect a 1 F capacitor to ground.
V
ceiver. 4.75V V
ing regulator.
D1 (Pin 9): TTL Level Driver 1 Input.
D2 (Pin 10): TTL Level Driver 2 Input.
D3 (Pin 11): TTL Level Driver 3 Input.
R1 (Pin 12): CMOS Level Receiver 1 Output with Pull-Up
to V
R2 (Pin 13): CMOS Level Receiver 2 Output with Pull-Up
to V
R3 (Pin 14): CMOS Level Receiver 3 Output with Pull-Up
to V
M0 (Pin 15): TTL Level Mode Select Input 0 with Pull-Up
to V
M1 (Pin 16): TTL Level Mode Select Input 1 with Pull-Up
to V
V
3V V
IN
DD
CC
IN
4
–
+
U
(Pin 17): Input Supply Pin. Input supply to transceiver.
IN
IN
IN
IN
IN
(Pin 3): Input Supply Pin. Input supply to boost
(Pin 5): Capacitor C1 Negative Terminal. Connect a
(Pin 6): Capacitor C1 Positive Terminal. Connect a
(Pin 8): Input Supply Pin. Input supply to trans-
(Pin 7): Generated Positive Supply Voltage for
. See Table 1.
. See Table 1.
when Three-Stated.
when Three-Stated.
when Three-Stated.
IN
U
3.6V. Connect to Pin 3.
CC
U
5.25V. Connect to output of switch-
+
+
IN
and C1
and C1
3.6V. Bypass with a 10 F
–
–
.
.
M2 (Pin 18): TTL Level Mode Select Input 2 with Pull-Up
to V
DCE/DTE (Pin 19): TTL Level Mode Select Input with
Pull-Up to V
R3 B (Pin 20): Receiver 3 Noninverting Input.
R3 A (Pin 21): Receiver 3 Inverting Input.
R2 B (Pin 22): Receiver 2 Noninverting Input.
R2 A (Pin 23): Receiver 2 Inverting Input.
D3/R1 B (Pin 24): Receiver 1 Noninverting Input and
Driver 3 Noninverting Output.
D3/R1 A (Pin 25): Receiver 1 Inverting Input and Driver 3
Inverting Output.
D2 B (Pin 26): Driver 2 Noninverting Output.
D2 A (Pin 27): Driver 2 Inverting Output.
D1 B (Pin 28): Driver 1 Noninverting Output.
D1 A (Pin 29): Driver 1 Inverting Output.
GND (Pin 30): Transceiver Ground.
V
a 3.3 F capacitor to GND.
C2
1 F capacitor between C2
C2
1 F capacitor between C2
SGND (Pin 34): Boost Switching Regulator Signal Ground.
Tie PGND to SGND.
FB (Pin 35): Boost Switching Regulator Feedback Pin.
Reference voltage is 1.255V. Connect resistive divider tap
here. Minimize trace area at FB.
SW (Pin 36): Boost Switching Regulator Switch Pin.
Connect inductor/diode here. Minimize trace area at this
pin to reduce EMI.
EE
–
+
(Pin 31): Generated Negative Supply Voltage. Connect
IN
(Pin 32): Capacitor C2 Negative Terminal. Connect a
(Pin 33): Capacitor C2 Positive Terminal. Connect a
. See Table 1.
IN
. See Table 1.
+
+
and C2
and C2
–
–
.
.
LTC2846
sn2846 2846fs
7