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LTC4311ISC6#TRMPBF

P1-P3P4-P6P7-P9P10-P12
LTC4311
1
4311fa
4311 TA01b
LTC4311
1V/DIV
V
CC
= 5V
C
LD
= 200pF
f
I
2
C
= 100kHz
1μs/DIV
R
PULL-UP
= 15.8k
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Low Voltage I
2
C/SMBus
Accelerator
The LTC
®
4311 is a dual I
2
C active pull-up designed to
enhance data transmission speed and reliability for bus
loading conditions well beyond the 400pF I
2
C specifi cation
limit. The LTC4311 operates at supply voltages from 1.6V
to 5.5V and is also compatible with SMBus.
The LTC4311 allows multiple device connections or a lon-
ger, more capacitive interconnect, without compromising
slew rates or bus performance, by using two slew limited
pull-up currents.
During positive bus transitions, the LTC4311 provides slew
limited pull-up currents to quickly slew the I
2
C or SMBus
lines to the bus pull-up voltage. During negative transitions
or steady DC levels, the currents are disabled to improve
negative slew rate, and improve low state noise margins.
An auto detect standby mode reduces supply current if
both SCL and SDA are high. When disabled, the LTC4311
goes into low (<5μA) current shutdown.
The LTC4311 is available in the 2mm × 2mm × 0.75mm
DFN, and SC70 packages.
Comparison of I
2
C Waveforms for
the LTC4311 vs Resistor Pull-Up
■
Improves I
2
C Bus Rise Time Transition
■
Ensures Data Integrity with Multiple Devices on the
I
2
C Bus.
■
Wide Supply Voltage Range: 1.6V to 5.5V
■
Improves Low State Noise Margin
■
Up to 400kHz Operation
■
Auto Detect Low Power Standby Mode
■
Low (<5μA) Supply Current Shutdown
■
Does Not Load Bus When Disabled or Powered Down
■
Strong Slew Limited Pull-up Current
■
±8kV Human Body Model ESD Ruggedness
■
2mm × 2mm DFN and SC70 Packages
■
Notebook and Palmtop Computers
■
Portable Instruments
■
Battery Chargers
■
Industrial Controls
■
TV/Video Products
■
ACPI SMBus Interface
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All
other trademarks are the property of their respective owners. Protected by U.S. Patents
includin
g
6356140 and 6650174.
LTC4311
V
CC
ENABLE
GND
V
CC
2.5V
C1
0.01μF
BUS1
BUS2
DEVICE 1
CLK
IN
CLK
OUT
V
CC
2.5V
DATA
IN
DATA
OUT
DEVICE N
4311 TA01a
CLK
IN
10k
CLK
OUT
DATA
IN
DATA
OUT
10k
I
2
C
SCL
SDA
LTC4311
2
4311fa
Storage Temperature Range (DFN) ........– 65°C to 125°C
Storage Temperature Range (SC70).......–65°C to 125°C
Lead Temperature (Soldering 10, sec)
SC70 ............................................................ 300°C
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND .................................................... –0.3 to 6V
BUS1, BUS2, ENABLE Inputs ......................... –0.3 to 6V
Operating Temperature
LTC4311C ................................................ 0°C to 70°C
LTC4311I..............................................– 40°C to 85°C
(Notes 1, 2)
TOP VIEW
GND
BUS2
BUS1
ENABLE
NC
V
CC
DFN PACKAGE
6-LEAD (2mm s 2mm) PLASTIC DFN
4
5
7
6
3
2
1
T
JMAX
= 125°C, θ
JA
= 102°C/W
EXPOSED PAD (PIN 7) PCB CONNECTION TO GND IS OPTIONAL (Note 3)
V
CC
GND
ENABLE
1
2
3
6
5
4
BUS1
GND
BUS2
TOP VIEW
SC70 PACKAGE
6-LEAD PLASTIC SC70
T
JMAX
= 125°C, θ
JA
= 150° C/W
ORDER INFORMATION
Lead Free Finish
TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4311CDC#TRMPBF LTC4311CDC#TRPBF LCNG
6-Lead (2mm × 2mm) Plastic DFN
0°C to 70°C
LTC4311IDC#TRMPBF LTC4311IDC#TRPBF LCNG
6-Lead (2mm × 2mm) Plastic DFN
–40°C to 85°C
LTC4311CSC6#TRMPBF LTC4311CSC6#TRPBF LCNF
6-Lead (2mm × 2mm) Plastic SC70
0°C to 70°C
LTC4311ISC6#TRMPBF LTC4311ISC6#TRPBF LCNF
6-Lead (2mm × 2mm) Plastic SC70
–40°C to 85°C
TRM = 500 pieces. *Temperature grades are identifi ed by a label on the shipping container.
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
Consult LTC Marketing for information on lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/
LTC4311
3
4311fa
ELECTRICAL CHARACTERISTICS
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 currents into pins are positive. All voltages are referenced to
GND unless otherwise specifi ed.
Note 3: Thermal characteristics are determined with exposed pad soldered
to GND plane. If the exposed pad is left open, thermal characteristics can
be drastically different.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Positive Supply Voltage
●
1.6 5.5 V
I
CC
Supply Current V
CC
= 5.5V, ENABLE = 5.5V, V
BUS1
= V
BUS2
= 0V
●
200 300 μA
I
CC_STANDBY
Supply Current, Standby Mode V
CC
= 5.5V, ENABLE = 5.5V, V
BUS1
= V
BUS2
= 5.5V
●
26 45 μA
I
CC_DISABLED
Supply Current, Disabled V
CC
= 5.5V, ENABLE = 0V, V
BUS1
= V
BUS2
= 5.5V
●
±5 μA
I
PULLUPAC
Transient Boosted Pull-up Current Positive Transition on Bus, Slew Rate = 0.5V/μs
V
CC
= 1.8V, BUS > V
THR
●
2.5 5 mA
I
BUS(IN)
BUS1,BUS2, Input Leakage Current V
CC
= 0V, V
BUS1
= V
BUS2
= 5.5V
●
±5 μA
I
ENABLE(IN)
ENABLE Input Leakage Current V
CC
= 0V, V
ENABLE
= 5.5V
●
±10 μA
V
THR
Bus Input Threshold Voltage V
CC
= 1.8V
●
0.45 0.55 0.65 V
V
CC
= 2.5V
●
0.65 0.75 0.85 V
V
CC
= 2.7V to 5.5V
●
0.68 0.78 0.88 V
V
THR_ENABLE
ENABLE Threshold Voltage V
CC
= 1.6V, 5.5V
●
0.4 1 1.5 V
SR
THRESH
Slew Rate Detector Threshold BUS > V
THR
, V
CC
= 1.8V, 5.5V
●
0.2 0.5 V/μs
t
r
Fast Mode I
2
C Bus Rise Time Bus Capacitance = 400pF, V
CC
= 3V (Note 4)
●
300 ns
f
MAX
Bus Maximum Operating Frequency (Note 5)
●
400 kHz
• The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
CC
= 3.3V, unless otherwise noted.
Note 4: The rise time of an I
2
C bus line is calculated from V
IL(MAX)
to
V
IH(MIN)
or 0.9V to 2.1V (with V
CC
= 3V). This parameter is guaranteed by
design and not tested. With a minimum boosted pull-up current of 2.5mA:
Rise Time = (2.1V – 0.9V) • 400pF/2.5mA = 0.19μs.
Note 5: Determined by design, not tested in production.
P1-P3P4-P6P7-P9P10-P12

LTC4311ISC6#TRMPBF

Mfr. #:
Buy LTC4311ISC6#TRMPBF
Manufacturer:
Analog Devices Inc.
Description:
Interface - Specialized L V I2C/SMBus Accelerator
Lifecycle:
New from this manufacturer.
Delivery:
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