Datasheet

3
LTC1536
1536fa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
PBR
PBR Pull-Up Current PBR = 0V, 0°C ≤ T
A
≤ 70°C ● 3710 µA
PBR = 0V, –40°C ≤ T
A
≤ 85°C ● 3715 µA
V
IL
PBR, RST Input Low Voltage ● 0.8 V
V
IH
PBR, RST Input High Voltage ● 2V
t
PW
PBR Min Pulse Width ● 40 ns
t
DB
PBR Debounce Deassertion of PBR Input to SRST ● 20 35 ms
Output (PBR Pulse Width = 1µs)
t
PB
PBR Assertion Time for Transition PBR Held Less Than V
IL
, 0°C to 70°C ● 1.4 2.0 2.8 s
from Soft to Hard Reset Mode PBR Held Less Than V
IL
, –40°C to 85°C ● 1.4 2.0 3.0 s
V
OL
RST Output Voltage Low I
SINK
= 5mA ● 0.15 0.4 V
I
SINK
= 100µAV
CC3
= 1V, V
CC5
= 0V ● 0.05 0.4 V
0°C ≤ T
A
≤ 70°CV
CC3
= 0V, V
CC5
= 1V ● 0.05 0.4 V
V
CC3
= 1V, V
CC5
= 1V ● 0.05 0.4 V
I
SINK
= 100µAV
CC3
= 1.1V, V
CC5
= 0V ● 0.05 0.4 V
–40°C ≤ T
A
≤ 85°CV
CC3
= 0V, V
CC5
= 1.1V ● 0.05 0.4 V
V
CC3
= 1.1V, V
CC5
= 1.1V ● 0.05 0.4 V
SRST Output Voltage Low I
SINK
= 2.5mA ● 0.15 0.4 V
RST Output Voltage Low I
SINK
= 2.5mA ● 0.15 0.4 V
V
OH
RST Output Voltage High (Note 3) I
SOURCE
= 1µA ● V
CC3
– 1 V
SRST Output Voltage High (Note 3) I
SOURCE
= 1µA ● V
CC3
– 1 V
RST Output Voltage High I
SOURCE
= 600µA ● V
CC3
– 1 V
t
PHL
Propagation Delay RST to RST C
RST
= 20pF 25 ns
High Input to Low Output
t
PLH
Propagation Delay RST to RST C
RST
= 20pF 45 ns
Low Input to High Output
t
FAIL
V
CC5
or V
CC3
0.5V Undervoltage V
CC5
Drops Below 4.25V or V
CC3
Drops ● 150 450 ns
to RST (Note 4) Below 2.5V (Note 5)
t
PF
V
CC5
< (V
CC3
– 300mV) RST (Note 4) V
CC5
Drops Below V
CC3
By 300mV ● 50 90 ns
(Note 6)
Note 4: Conforms to PCI Local Bus Specification Rev 2.1,
Sect. 4.3.2 for t
FAIL
.
Note 5: V
CC3
or V
CC5
falling at –0.1V/µs, time measured from
V
RTX
– 500mV to RST at 1.5V.
Note 6: V
CC5
falling from 5V to 3V in ≤10ns, time measured from
V
CC5
= (V
CC3
– 300mV) to RST at 1.5V.
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All voltage values are with respect to GND.
Note 3: The output pins SRST and RST have weak internal pull-ups to
V
CC3
of 6µA. However, external pull-up resistors may be used when faster
rise times are required.
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC3
= 3.3V, V
CC5
= 5V, V
CCA
= V
CC3
unless otherwise noted.