LT1015
High Speed
Dual Line Receiver
FEATURES
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s
s
s
s
s
s
DESCRIPTION
The LT
®
1015 is a dual high speed comparator intended for
line receiver and other general purpose fast comparator
functions. It has 10ns response time, true differential
inputs, TTL outputs and operates from a single 5V supply.
A unique output stage design virtually eliminates power
supply glitching during transitions. This greatly reduces
instability and crosstalk problems in multiple line applica-
tions. No minimum input slew rate is required as in
previous TTL output comparators.
The LT1015 has a true Latch pin for retaining output data.
Setup time is 2ns, allowing the comparators to capture
data much faster than the actual flowthrough response
time. 8-pin miniDIP and ceramic packages allow high
packing density.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Response Time: 10ns
Setup Time for Latch: 2ns
Operates on Single 5V Supply
Dual Function in 8-Pin Package
No Input Slew Rate Requirement
Latch Function Included on Chip
True Differential Inputs
APPLICATIONS
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High Speed Differential Line Receiver
Pulse Height/Width Discriminator
Timing and Delay Generators
Analog to Digital Interface
TYPICAL APPLICATION
BLOCK DIAGRAM
2-Channel 20MHz Clocked Line Receiver
5V
INPUT A
V
+
+
1/2
LT1015
CHANNEL A
INPUT A
+
1/2
LT1015
OUTPUT A
LATCH (BOTH SIDES)
DEVICE ACTIVE WITH
LATCH LOW. “OPEN”
GOES TO HIGH STATE
OUTPUT B
1015 • BD
–
CLOCK
INPUT B
REFERENCE
INPUT
DATA LATCHED
ON POSITIVE EDGE
CHANNEL B
INPUT B
1015 • TA01
–
1/2
LT1015
+
–
–
+
1/2
LT1015
W
U
U
U
1
LT1015
ABSOLUTE
MAXIMUM
RATINGS
Supply Voltage .......................................................... 7V
Differential Input Voltage ........................................... 5V
Input Voltage
Positive................................................ Supply + 0.5V
Negative .............................................................. – 1V
Input Current (Forced) Positive ............................ 20mA
Latch Pin Voltage........................................ Supply + 1V
Output Current (Continuous) ..............................
±20mA
Operating Temperature Range
LT1015C .................................................. 0°C to 70°C
LT1015M ........................................ – 55°C to 125°C*
Storage Temperature ............................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
*Air flow must be provided for T
A
> 100°C
PACKAGE/ORDER INFORMATION
TOP VIEW
INPUT A 1
REFERENCE 2
INPUT B 3
LATCH 4
J8 PACKAGE
8-LEAD CERDIP
8
7
6
5
V
+
OUTPUT A
GND
OUTPUT B
ORDER PART
NUMBER
LT1015CJ8
LT1015CN8
LT1015MJ8
N8 PACKAGE
8-LEAD PDIP
T
JMAX
= 150°C,
θ
JA
= 100°C/ W (J8)
T
JMAX
= 100°C,
θ
JA
= 130°C/ W (N8)
Consult factory for Industrial grade parts.
ELECTRICAL CHARACTERISTICS
+
PARAMETER
Input Offset Voltage (Note 1)
Input Bias Current
Reference Input Current
Voltage Gain (Note 3)
Common Mode Input Range (Note 5)
Output High Voltage
Output Low Voltage
Supply Current
Latch Pin High Input Voltage
Latch Pin Low Input Voltage
Latch Pin Current
Propagation Delay
V = 4.6V to 5.4V, V
LATCH
= 0V, common mode input voltage = 2.5V, T
J
= 25°C, unless otherwise noted.
CONDITIONS
V
CM
= 1.25V to (V
+
– 1.5V)
∆V
IN
= 0V (Note 2)
∆V
IN
= 0V (Note 2)
V
OUT
= 0.5V to 2.5V, Load = 1 TTL Gate
Minimum Input
Maximum Input
I
OUT
= 4mA
I
SINK
= 4mA
V
+
= 5V
Device Latched
Device Active
∆V
IN
≥
20mV (Note 4)
0°C
≤
T
J
≤
100°C
– 55°C
≤
T
J
≤
150°C
MIN
q
q
q
q
q
q
q
q
q
q
q
q
q
q
1000
V
+
– 1.5
2.5
TYP
1
15
30
2500
1.0
+
– 1.0
V
0.3
55
MAX
20
30
60
1.25
0.5
70
2
1
0.8
UNITS
mV
µA
µA
V/V
V
V
V
V
mA
V
V
mA
ns
ns
ns
7
7
Latch Setup Time
The
q
denotes specifications which apply over the full operating
temperature range.
Note 1:
Input offset voltage is the maximum required to drive the output to
a low state of 0.5V and high state of 2.5V.
Note 2:
Input currents are measured by applying a large positive
differential input voltage. The resulting input current is divided by two to
obtain input current at
∆V
IN
= 0V.
Note 3:
Voltage gain is guaranteed by design, but not tested.
Note 4:
Propagation delay is sample tested in production with a large
overdrive. The limit is guard banded to account for the slight increase
(≈ 500ps) at 20mV overdrive.
10
10
2
14
16
Note 5:
Common mode input range is the voltage range over which the
differential input offset voltage is less than 20mV. If both inputs remain
inside this common mode range, propagation delay will be unaffected. It
will also be normal if the signal input is below the 1.25V lower limit when
the input transition begins. An increase in propagation delay of up to 10ns
may occur if the signal input is above the upper common mode limit when
the transition begins. Sine wave inputs may not be affected when the peak
exceeds the common mode range if the signal is inside the common mode
range for 10ns before threshold is reached.
2
U
W
U
U
W W
W
LT1015
TYPICAL PERFORMANCE CHARACTERISTICS
U W
40
Propagation Delay vs Overdrive
25
T
J
= 25°C
20
25
20
30
Propagation Delay vs Temperature
6
STEP SIZE = 100mV
OVERDRIVE = 5mV
OUTPUT LOAD CAPACITANCE = 10pF
V
S
= 5V
4
2
Latch Set-Up Time
TIME (ns)
TIME (ns)
15
FALLING OUTPUT t
PDHL
10
RISING OUTPUT t
PDHL
5
0
50
100
–50 –25
25
75
0
JUNCTION TEMPERATURE (°C)
TIME (ns)
125
15
STEP SIZE = 100mV
0
–2
–4
–6
50
100
–50 –25
25
75
0
JUNCTION TEMPERATURE (°C)
10
5
0
0
10
30
20
OVERDIRVE (mV)
50
125
LT1015 • TPC01
LT1015 • TPC02
LT1015 • TPC03
Output Low Voltage (V
OL
)
0.8
0.7
0.6
VOLTAGE (V)
Output High Voltage (V
OH
)
5.0
6
Common Mode Limits
V
S
= 5V
5
UPPER LIMIT*
4
3
2
1
V
S
= SINGLE 5V SUPPLY
LOWER LIMIT
V
S
= 5V, V
IN
= 30mV
4.5
OUTPUT VOLTAGE (V)
V
S
= 5V
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.4
0.3
T
J
= –55°C
T
J
= 25°C
T
J
= 125°C
T
J
= 25°C
T
J
= –55°C
0.2
0.1
0
0
2
4
6 8 10 12 14 16 18 20
OUTPUT SINK CURRENT (mA)
LT1015 • TPC04
INPUT VOLTAGE (V)
T
J
= 125°C
0
2
4
6 8 10 12 14 16 18 20
OUTPUT SINK CURRENT (mA)
LT1015 • TPC05
0
50
100
–50 –25
25
75
0
JUNCTION TEMPERATURE (°C)
125
LT1015 • TPC06
* UPPER LIMIT TRACKS 5V SUPPLY. 4.1V LIMIT
AT 25
°C
WILL DROP TO 3.8V WHEN V
S
= 4.7V
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
3
LT1015
PACKAGE DESCRIPTION
U
Dimensions in inches (millimeters) unless otherwise noted.
J8 Package
8-Lead CERDIP (Narrow 0.300, Hermetic)
(LTC DWG # 05-08-1110)
CORNER LEADS OPTION
(4 PLCS)
0.300 BSC
(0.762 BSC)
0.023 – 0.045
(0.584 – 1.143)
HALF LEAD
OPTION
0.045 – 0.068
(1.143 – 1.727)
FULL LEAD
OPTION
0.200
(5.080)
MAX
0.015 – 0.060
(0.381 – 1.524)
0.005
(0.127)
MIN
0.405
(10.287)
MAX
8
7
6
5
0.008 – 0.018
(0.203 – 0.457)
0.385
±
0.025
(9.779
±
0.635)
0° – 15°
0.025
(0.635)
0.125 RAD TYP
3.175
0.100
±
0.010 MIN
(2.540
±
0.254)
0.220 – 0.310
(5.588 – 7.874)
0.045 – 0.068
(1.143 – 1.727)
0.014 – 0.026
(0.360 – 0.660)
1
2
3
4
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS.
J8 0694
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.300 – 0.325
(7.620 – 8.255)
0.045 – 0.065
(1.143 – 1.651)
0.130
±
0.005
(3.302
±
0.127)
0.400*
(10.160)
MAX
8
7
6
5
0.009 – 0.015
(0.229 – 0.381)
0.065
(1.651)
TYP
0.005
(0.127)
MIN
0.100
±
0.010
(2.540
±
0.254)
0.125
(3.175)
MIN
0.018
±
0.003
(0.457
±
0.076)
0.015
(0.380)
MIN
0.255
±
0.015*
(6.477
±
0.381)
(
+0.025
0.325 –0.015
+0.635
8.255
–0.381
)
1
2
3
4
N8 0695
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
RELATED PARTS
PART NUMBER
LT1016
LT1116
LTC
®
1520
DESCRIPTION
Ultrafast Precision Comparator
12ns, Single-Supply Ground Sensing Comparator
50Mbits/s Precision Quad Line Driver
COMMENTS
10ms Propagation Delay, Complimentary TTL Outputs
Inputs Can Exceed Positive Supply Up to 15V
18ns Propagation Delay Over Temperature Rail-to-Rail Inputs
4
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
q
FAX
: (408) 434-0507
q
TELEX
: 499-3977
LT/GP 1195 1K REV A • PRINTED IN USA
©
LINEAR TECHNOLOGY CORPORATION 1995
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