LTC1688CS Linear Technology, LTC1688CS Datasheet - Page 5

• Manufacturer Part Number: LTC1688CS
• Description: IC DVR 100MBPS RS485 QUAD 16SOIC
• Manufacturer: Linear Technology
• Type: Driverr

Specifications of LTC1688CS

• Number Of Drivers/receivers: 4/0
• Protocol: RS485
• Voltage - Supply: 3V, 5V
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

DI1 (Pin 1): Driver 1 Input. Do not float.
DO1A (Pin 2): Driver 1 Noninverting Output.
DO1B (Pin 3): Driver 1 Inverting Output.
EN (Pin 4, LTC1688): High True Enable Pin, enables all
four drivers. A low on Pin 4 and a high on Pin 12 will put
all driver outputs into a high impedance state. See
Function Tables for details. Do not float.
EN12 (Pin 4, LTC1689): Enables Drivers 1 and 2. A low on
Pin 4 will put the outputs of drivers 1 and 2 into a high
impedance state. See Function Tables for details. Do not
float.
DO2B (Pin 5): Driver 2 Inverting Output.
DO2A (Pin 6): Driver 2 Noninverting Output.
DI2 (Pin 7): Driver 2 Input. Do not float.
GND (Pin 8): Ground Connection. A good ground plane is
recommended for all applications.
FU CTIO TABLES
PIN
LTC1688
TEST CIRCUITS
Figure 1. Driver DC Test Load
U
U
DI
H
H
X
B
L
L
A
FUNCTIONS
V
OD
U
INPUTS
U
R
R
EN
H
H
X
X
L
1688/89 TC01
V
OC
U
ENB
X
X
H
L
L
OUTA
HI-Z
H
H
DI
L
L
Figure 2. Driver Timing Test Circuit
OUTPUTS
ENB (EN34)
EN (EN12)
DRIVER
OUTB
HI-Z
H
H
L
L
A
B
R
DIFF
DI3 (Pin 9): Driver 3 Input. Do not float.
DO3A (Pin 10): Driver 3 Noninverting Output.
DO3B (Pin 11): Driver 3 Inverting Output.
ENB (Pin 12, LTC1688): Low True Enable Pin, enables all
four drivers. A low on Pin 4 and a high on Pin 12 will put
all driver outputs into a high impedance state. See
Function Tables for details. Do not float.
EN34 (Pin 12, LTC1689): Enables Drivers 3 and 4. A low
on Pin 12 will put the outputs of drivers 3 and 4 into a high
impedance state. See Function Tables for details. Do not
float.
DO4B (Pin 13): Driver 4 Inverting Output.
DO4A (Pin 14): Driver 4 Noninverting Output.
DI4 (Pin 15): Driver 4 Input. Do not float.
V
bypassed with a 0.1 F ceramic capacitor as close to the
pin as possible. Recommended: V
LTC1689
DD
C
C
L1
L2
1688/89 TC02
(Pin 16): Power Supply Input. This pin should be
DI
H
L
X
INPUTS
UNDER TEST
EN12/EN34
OUTPUT
Figure 3. Driver Timing Test Load
H
H
LTC1688/LTC1689
L
500
C
L
DD
OUTA
HI-Z
= 3V to 5.25V.
H
L
OUTPUTS
S1
S2
OUTB
HI-Z
1688/89 TC03
H
L
16889fa
5
V
DD