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Linear Technology Electronic Components Datasheet

LTC1694 Datasheet

SMBus/I2C Accelerator

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LTC1694 pdf
LTC1694
SMBus/I2C Accelerator
FEATURES
s Improves SMBus Rise Time Transition
s Ensures Data Integrity with Multiple Devices
on the SMBus
s Improves Low State Noise Margin
s Auto Detect Low Power Standby Mode
s Wide Supply Voltage Range: 2.7V to 6V
s Tiny 5-Pin SOT-23 Package
U
APPLICATIO S
s Notebook and Palmtop Computers
s Portable Instruments
s Battery Chargers
s Industrial Control Application
s TV/Video Products
s ACPI SMBus Interface
DESCRIPTIO
The LT C®1694 is a dual SMBus active pull-up designed to
enhance data transmission speed and reliability under all
specified SMBus loading conditions. The LTC1694 is also
compatible with the Philips I2CTM Bus.
The LTC1694 allows multiple device connections or a
longer, more capacitive interconnect, without compro-
mising slew rates or bus performance, by using two
bilevel hysteretic current source pull-ups.
During positive bus transitions, the LTC1694 current
sources provide 2.2mA to quickly slew the SMBus line.
During negative transitions or steady DC levels, the cur-
rent sources decrease to 275µA 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.
The LTC1694 is available in a 5-pin SOT-23 package,
requiring virtually the same space as two surface mount
resistors.
, LTC and LT are registered trademarks of Linear Technology Corporation.
I2C is a trademark of Philips Electronics N.V.
TYPICAL APPLICATIO
VCC
5V 1
C1
0.1µF
2
VCC SMBus1
LTC1694
GND SMBus2
5
4
SCL
SMBus SDA
CLK
IN
CLK
OUT
DEVICE 1
DATA
IN
DATA
OUT
CLK
IN
CLK
OUT
DEVICE N
DATA
IN
DATA
OUT
LTC1694: Patent Pending
1694 TA01
Comparison of SMBus Waveforms for
the LTC1694 vs Resistor Pull-Up
1V/DIV
LTC1694
RPULL-UP
= 15.8k
VCC = 5V
CLD = 200pF
fSMBus = 100kHz
1µs/DIV
1694 TA02
1


Linear Technology Electronic Components Datasheet

LTC1694 Datasheet

SMBus/I2C Accelerator

No Preview Available !

LTC1694 pdf
LTC1694
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage (VCC) ................................................. 7V
SMBus1, SMBus2 Inputs ............ – 0.3V to (VCC + 0.3V)
Operating Ambient Temperature Range ....... 0°C to 70°C
Junction Temperature ........................................... 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec.)................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
VCC 1
GND 2
NC 3
5 SMBus1
4 SMBus2
S5 PACKAGE
5-LEAD PLASTIC SOT-23
TJMAX = 125°C, θJA = 256°C/ W
ORDER PART
NUMBER
LTC1694CS5
S5 PART MARKING
LTEE
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
The q denotes specifications that apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VCC = 2.7V to 6V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
VCC
ICC
IPULL-UP
VTHRES
SRTHRES
tr
Supply Voltage Range
Supply Current
Pull-Up Current
Boosted Pull-Up Current
Input Threshold Voltage
Slew Rate Detector Threshold
SMBus Rise Time
Standard Mode I2C Bus Rise Time
2.7 6
SMBus1 = SMBus2 = Open
q 20
60 100
SMBus1 = SMBus2 = 0V
q 125 275 350
Positive Transition on SMBus ( Figure 1) q
Slew Rate = 0.5V/µs, SMBus > VTHRES
1.0
2.2
Slew Rate = 0.5V/µs (Figure 1)
q 0.4 0.65 0.9
SMBus > VTHRES
Bus Capacitance = 200pF (Note 2)
Bus Capacitance = 400pF (Note 3)
q
q
q
0.2 0.5
0.32 1.0
0.30 1.0
V
µA
µA
mA
V
V/µs
µs
µs
fMAX
SMBus Maximum Operating Frequency
(Note 4)
q 100 kHz
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The rise time of an SMBus line is calculated from (VIL(MAX)
0.15V) to (VIH(MIN) + 0.15V) or 0.65V to 2.25V. This parameter is
guaranteed by design and not tested. With a minimum pull-up current of
125µA, a minimum boosted pull-up current of 1mA and a maximum input
threshold voltage of 0.9V:
Rise Time = [(0.9V – 0.65V)/125µA + (2.25V – 0.9V)/1mA] • 200pF
= 0.67µs
Note 3: The rise time of an I2C bus line is calculated from VIL(MAX) to
VIH(MIN) or 1.5V to 3V (with VCC = 5V). This parameter is guaranteed by
design and not tested. With a minimum boosted pull-up current of 1mA:
Rise Time = (3V – 1.5V) • 400pF/1mA = 0.6µs
Note 4: This parameter is guaranteed by design and not tested.
2


Part Number LTC1694
Description SMBus/I2C Accelerator
Maker Linear Technology
Total Page 8 Pages
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