Datasheet
4
LTC1686/LTC1687
The ● denotes specifications which apply over the full operating
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: All currents into the device pins are positive; all currents out of the
device pins are negative.
Note 3: All typicals are given for V
DD
= 5V, T
A
= 25°C.
Note 4: Guaranteed by design, but not tested.
Note 5: Short-circuit current does not represent output drive capability.
When the output detects a short-circuit condition, output drive current is
significantly reduced (from hundreds of mA to 20mA max) until the short
is removed.
TYPICAL PERFORMANCE CHARACTERISTICS
UW
FREQUENCY (Hz)
10
42.0
COMMON MODE REJECTION RATIO (dB)
42.5
43.5
44.0
44.5
46.5
1686/87 G01
43.0
1k 100k 1M
45.0
45.5
46.0
T
A
= 25°C
Receiver Input CMRR
TEMPERATURE (°C)
–25
SUPPLY CURRENT (mA)
53
54
55
50
100
1686/87 G03
52
51
50
025 75
56
57
58
BOTH DRIVER AND RECEIVER
ENABLED AND LOADED
25Mbps DATA RATE
DATA RATE (Mbps)
1
50
60
70
4030
1686/87 G02
40
30
10 20 50
20
10
0
SUPPLY CURRENT (mA)
BOTH DRIVER AND RECEIVER
ENABLED AND LOADED
T
A
= 25°C
Supply Current vs Data Rate
Supply Current vs Temperature
Receiver Propagation Delay
vs Load Capacitance
Receiver Propagation Delay
vs Common Mode
LOAD CAPACITANCE (pF)
5
0
PROPAGATION DELAY (ns)
5
10
15
20
30
15
25 35 55
1686/87 G04
105 205
25
T
A
= 25°C
RECEIVER COMMON MODE (V)
–7
0
PROPAGATION DELAY (ns)
5
15
20
25
–2
2
412
1686/87 G05
10
–4 0
6
8
10
T
A
= 25°C
Receiver Propagation Delay
vs Input Overdrive
RECEIVER INPUT OVERDRIVE (V)
0.3 0.5
0
RECEIVER PROPAGATION DELAY (ns)
10
25
0.7
1.25
1.5
1686/87 G06
5
20
15
1.0
2.0
2.5
T
A
= 25°C
Minimum Input Pulse Width V
DD
= 5V ±5% (Note 4) LTC1686C/LTC1687C ● 17 19.2 ns
LTC1686I/LTC1687I
● 20 25 ns
Maximum Data Rate V
DD
= 5V ±5% (Note 4) LTC1686C/LTC1687C ● 52 60 Mbps
LTC1686I/LTC1687I
● 40 50 Mbps
Maximum Input Frequency V
DD
= 5V ±5% (Note 4) LTC1686C/LTC1687C ● 26 30 MHz
LTC1686I/LTC1687I
● 20 25 MHz
SWITCHING CHARACTERISTICS
U
V
DD
= 5V, unless otherwise noted (Notes 2, 3).
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS