Datasheet
LMC6953
www.ti.com
SNVS132D –APRIL 1998–REVISED APRIL 2013
DC ELECTRICAL CHARACTERISTICS
Unless otherwise specified, all boldface limits specified for T
J
= −40°C to +85°C, V
DD
= 5V, R
PULL-UP
= 4.7 kΩ and C
EXT
= 0.01
μF. Typical numbers are room temperature (25°C) performance.
Symbol Parameter Conditions Min Typ Max Units
V
H5
V
DD
Over-Voltage Threshold T
J
= 0°C to 70°C
(1)
5.45 5.60 5.75 V
T
J
= −40°C to 85°C
(1)
5.30 5.60 5.90 V
V
L5
V
DD
Under-Voltage Threshold T
J
= 0°C to 70°C
(1)
4.25 4.40 4.55 V
T
J
= −40°C to 85°C
(1)
4.10 4.40 4.70 V
V
H3.3
3.3V Over-Voltage Threshold T
J
= 0°C to 70°C
(2)
3.80 3.95 4.10 V
T
J
= −40°C to 85°C
(2)
3.60 3.95 4.30 V
V
L3.3
3.3V Under-Voltage Threshold T
J
= 0°C to 70°C
(2)
2.50 2.65 2.80 V
T
J
= −40°C to 85°C
(2)
2.30 2.65 3.00 V
V
MR
Manual RESET Threshold 2.50 2.80 V
V
PF
Power Failure Differential Voltage
(3)
150 300 mV
(3.3V Pin–5V Pin)
R
IN
Input Resistance at 5V and 3.3V Pins 35 kΩ
V
OL
RESET Output Low T
J
= 0°C to 70°C
V
DD
= 1.5V to 6V
0.05 0.10 V
T
J
= −40°C to 85°C
V
DD
= 1.55V to 6V
I
S
Supply Current
(4)
0.8 1.50 mA
(1) PCI Specifications Revision 2.1, Section 4.2.1.1 and Section 4.3.2.
(2) PCI Specifications Revision 2.1, Section 4.2.2.1 and Section 4.3.2.
(3) PCI Specifications Revision 2.1 and Section 4.3.2.
(4) Supply current measured at pins 1, 2, and 3. The 4.7 kΩ pull-up resistor on pin 7 is not tied to V
DD
in this measurement.
AC ELECTRICAL CHARACTERISTICS
Unless otherwise specified, all boldface limits specified for T
J
= −40°C to 85°C, V
DD
= 5V, R
PULL-UP
= 4.7 kΩ and C
EXT
= 0.01
μF. Typical numbers are room temperature (25°C) performance.
LMC6953
Symbol Parameter Conditions Typ Units
Limit
t
D
Over or Under Voltage Response Time
(1)
150 490 ns
max
t
PF
Power Failure Response Time
(2)
40 ns
90
max
t
RESET
Reset Delay C
EXT
= 0.01 μF 100 ms
(1) PCI Specifications Revision 2.1, Section 4.3.2. The response time is measured individually with ±750 mV of overdrive applied to pin 2
then ±600 mV of overdrive applied to pin 3 and taking the worst number of the four measurements.
(2) PCI Specifications Revision 2.1, Section 4.3.2. The power failure response time is measured with a signal changing from 5V to 3V
applied to pin 2 and a 3.3V DC applied to pin 3.
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