3

LTC1536

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

PBR Pull-Up Current

PBR = 0V, 0

q

37

10

µA

PBR = 0V, – 40

q

37

15

µA

PBR, RST Input Low Voltage

q

0.8

V

PBR, RST Input High Voltage

q

2V

PBR Min Pulse Width

q

40

ns

PBR Debounce

Deassertion of PBR Input to SRST

q

20

35

ms

Output (PBR Pulse Width = 1

µs)

PBR Assertion Time for Transition

q

1.4

2.0

2.8

s

from Soft to Hard Reset Mode

q

1.4

2.0

3.0

s

RST Output Voltage Low

q

0.15

0.4

V

q

0.05

0.4

V

0

q

0.05

0.4

V

q

0.05

0.4

V

q

0.05

0.4

V

–40

q

0.05

0.4

V

q

0.05

0.4

V

SRST Output Voltage Low

q

0.15

0.4

V

RST Output Voltage Low

q

0.15

0.4

V

RST Output Voltage High (Note 3)

q

V

SRST Output Voltage High (Note 3)

q

V

RST Output Voltage High

q

V

Propagation Delay RST to RST

25

ns

High Input to Low Output

Propagation Delay RST to RST

45

ns

Low Input to High Output

q

150

450

ns

to RST (Note 4)

Below 2.5V (Note 5)

q

50

90

ns

(Note 6)

ELECTRICAL CHARACTERISTICS

Note 4: Conforms to PCI Local Bus Specification Rev 2.1,

temperature range.

Note 1: Absolute Maximum Ratings are those values beyond which the life

of the device may be impaired.

Note 2: All voltage values are with respect to GND.

Note 3: The output pins SRST and RST have weak internal pull-ups to

rise times are required.