LM6511
180 ns 3V Comparator
General Description
The LM6511 voltage comparator is ideal for analog-digital in-
terface circuitry when only a +3V or +3.3V supply is avail-
able. The open-collector output permits signal compatibility
with a wide variety of digital families: +5V CMOS, +3V
CMOS, TTL and so on. Supply voltage may range from 2.7V
to 36V between supply voltage leads. The LM6511 operates
with little power consumption (P
diss
<
9.45 mW at V
+
=
+2.7V and V
-
= 0V).
This voltage comparator offers many features that are avail-
able in traditional sub-microsecond comparators: output
sync strobe, inputs and output may be isolated from system
ground, and wire-ORing. Also, the LM6511 uses the
industry-standard, single comparator pinout configuration.
Features
(Typical unless otherwise noted)
n
Operates at +2.7V, +3V, +3.3V, +5V
n
Low Power consumption
<
9.45 mW
@
V
+
= 2.7V (max)
n
Fast Response Time of 180 ns
Applications
n
Portable Equipment
n
Cellular Phones
n
Digital Level Shifting
Connection Diagram
Ordering Information
Package
Industrial Temperature Range
NSC Package
-40C to +85C
Drawing
8-Pin Small Outline
LM6511IM
M08A
8-Pin SO
DS011888-1
June 1999
LM651
1
180
ns
3V
Comparator
1999 National Semiconductor Corporation
DS011888
www.national.com
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
-0.3 to +36V
Output to Negative Supply Voltage
50V
Ground to Negative Supply Voltage
30V
Differential Input Voltage
30V
Input Voltage
(Note 2)
Storage Temperature Range
-65C to +150C
Soldering Information:
SO Package
(Vapor Phase in 60 sec)
SO Package (Infrared in 15 sec)
215C
220C
Power Dissipation
500 mW
Output Short Circuit Duration
10s
Junction Temperature
150C
ESD Rating
(C = +100 pF, R = 1.5 k
)
300V
Operating Ratings
(Note 1)
Supply Voltage
2.5V to 30V
Temperature Range
-40C
T
J
+85C
Thermal Resistance (
JA
)
SO Package
170C/W
DC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25C. Boldface limits apply at the temperature extremes. V
+
= 2.7V,
V
-
= 0V, 50
R
L
50k
, and I
L
= 1.0 mA unless otherwise specified
Symbol
Parameter
Conditions
Typical
LM6511I
Units
(Limits)
Limit
V
OS
Offset Voltage
R
S
50 k
1.5
5
mV
(Note 3)
8
max
I
B
Input Bias Current
38
130
200
nA
max
I
OS
Input Offset Current
R
S
50 k
1.5
20
(Note 3)
50
I
S
Positive Supply Current
2.7
3.5
5
mA
max
Negative Supply Current
1.5
2.0
2.5
V
SAT
Saturation Voltage
V
IN
10 mV
0.23
0.4
V
I
SINK
= 8 mA
0.4
max
A
V
Large Signal Voltage Gain
V
OUT
= 2V
40
V/mV
CMRR
Common Mode Rejection Ratio
72
dB
I
STROBE
Strobe ON Current
(Note 5)
2.0
5.0
mA max
V
IN
Input Voltage Range
0.50
V min
V
+
- 1.25
V max
Output Leakage Current
V
IN
10 mV, V
OUT
= 35V,
0.2
nA
I
STROBE
= 3 mA
max
AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25C. Boldface limits apply at the temperature extremes. V
+
= 2.7V,
V
-
= 0V, 50
R
L
50k
, and I
L
= 1.0 mA unless otherwise specified
Symbol
Parameter
Conditions
Typical
LM6511I
Units
(Limits)
Limit
T
R
Response Time
(Note 4)
180
ns
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions the device is intended to
be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed
specifications apply only for the test conditions listed.
Note 2: The positive input voltage limit is 30V above the negative supply voltage. The negative input voltage limit is equal to the negative supply voltage or 30V below
the positive supply voltage, whichever is less.
Note 3: The offset voltage and offset current limits are the maximum values required to drive the output within a volt of either supply with a 1 mA load. Therefore,
these parameters define an error band and take into account the worst-case effects of voltage gain and input impedance.
Note 4: This specification is for a 100 mV input step with a 25 mV overdrive.
Note 5: This specification gives the range of current which must be drawn from the strobe pin to ensure the output is properly disabled. Do not short the strobe pin
to ground; it should be current driven at 3 mA to 5 mA.
www.national.com
2
Typical Application
Universal Logic Level Shifter
DS011888-4
Notes: Because of the very wide operating and output voltage range, the LM6511 may be used to shift logic levels from 3V to TTL or CMOS to the other way
around. By biasing the input to
1
/
2
of the input logic supply (V
A
), this assures that this input remains within the input voltage range. The pull-up resistor should
go to the output logic supply (V
B
).
www.national.com
5
PDF 
ZIP
