5
LTC1685
TYPICAL PERFORMANCE CHARACTERISTICS
UW
DI (Pin 4): Driver Input. Controls the states of the A and
B outputs only if DE = High. If DE = Low, DI will have no
effect on A and B pins. Do not float.
GND (Pin 5): Ground.
A (Pin 6): Noninverting Receiver Input/Driver Output.
B (Pin 7): Inverting Receiver Input/Driver Output.
V
DD
(Pin 8): Positive Supply, 5V to ±5%. Bypass with
0.1µF ceramic capacitor.
PIN FUNCTIONS
UUU
RO (Pin 1): Receiver Output. If A ≥ B by 300mV, then RO
will be high. If A ≤ B by 300mV, then RO will be low.
RE (Pin 2): Receiver Enable. RE = Low enables the
receiver. RE = High forces receiver output into high
impedance state. Do not float.
DE (Pin 3): Driver Enable. DE = High enables the driver.
DE = Low will force the driver output into a high impedance
state and the device will function as a line receiver if RE is
also low. Do not float.
Driver Propagation Delay
vs Temperature
Driver Propagation Delay
vs Driver Input Voltage
DRIVER INPUT VOLTAGE (V)
2.5
PROPAGATION DELAY (ns)
15
20
25
4.5
1685 G08
10
5
0
3.0
3.5
4.0
5.0
t
LH
V
DD
= 5V
INPUT THRESHOLD = 1.5V
T
A
= 25°C
t
HL
Driver Propagation Delay
vs Capacitive Load
LOAD CAPACITANCE (pF)
5
16.0
PROPAGATION DELAY (ns)
16.5
17.0
17.5
18.0
19.0
15
25 50 75
1685 G11
100 150
18.5
T
A
= 25°C
Receiver Maximum Data Rate
vs Input Overdrive
Receiver Propagation Delay
vs Temperature
TEMPERATURE (°C)
–50 –25
0
PROPAGATION DELAY (ns)
10
25
0
50
75
1680 G09
5
20
15
25
100
125
RECEIVER INPUT DIFFERENTIAL (V)
0.3
40
50
70
0.6 1.0
1685 G10
30
20
0.4 0.5
0.7 1.5 2.5
10
0
60
DATA RATE (Mbps)
T
A
= 25°C
TEMPERATURE (°C)
–20–40
0
PROPAGATION DELAY (ns)
5
10
15
20
25
0
20 40 60
1685 G07
80 100
