LTC1694CS5 Linear Technology, LTC1694CS5 Datasheet

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LTC1694CS5

Manufacturer Part Number
LTC1694CS5
Description
SMBus/I2C Accelerator
Manufacturer
Linear Technology
Datasheet

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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
LTC1694: Patent Pending
Improves SMBus Rise Time Transition
Ensures Data Integrity with Multiple Devices
on the SMBus
Improves Low State Noise Margin
Auto Detect Low Power Standby Mode
Wide Supply Voltage Range: 2.7V to 6V
Tiny 5-Pin SOT-23 Package
Notebook and Palmtop Computers
Portable Instruments
Battery Chargers
Industrial Control Application
TV/Video Products
ACPI SMBus Interface
SMBus
OUT
CLK
CLK
DEVICE 1
IN
C1
0.1 F
V
5V
CC
SDA
SCL
1
2
V
GND
DATA
DATA
CC
OUT
IN
LTC1694
U
SMBus1
SMBus2
5
4
OUT
CLK
CLK
DEVICE N
IN
U
DATA
DATA
OUT
IN
1694 TA01
DESCRIPTIO
The LT C
enhance data transmission speed and reliability under all
specified SMBus loading conditions. The LTC1694 is also
compatible with the Philips I
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 275 A 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.
I
2
C is a trademark of Philips Electronics N.V.
, LTC and LT are registered trademarks of Linear Technology Corporation.
1V/DIV
SMBus/I
®
1694 is a dual SMBus active pull-up designed to
V
C
f
SMBus
Comparison of SMBus Waveforms for
CC
LD
= 5V
= 200pF
the LTC1694 vs Resistor Pull-Up
= 100kHz
LTC1694
U
2
C Accelerator
1 s/DIV
R
= 15.8k
PULL-UP
2
C
TM
Bus.
LTC1694
1694 TA02
1

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LTC1694CS5 Summary of contents

Page 1

... 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 trademark of Philips Electronics N.V. Comparison of SMBus Waveforms for ...

Page 2

... With a minimum boosted pull-up current of 1mA: – IL(MAX) Rise Time = (3V – 1.5V) • 400pF/1mA = 0.6 s Note 4: This parameter is guaranteed by design and not tested ORDER PART NUMBER 5 SMBus1 LTC1694CS5 4 SMBus2 S5 PART MARKING LTEE = 256 MIN TYP MAX UNITS 2 ...

Page 3

W U TYPICAL PERFOR A CE CHARACTERISTICS Pull-Up Current at SMBus = 0V 350 325 300 275 250 V = 2.7V CC 225 200 175 150 125 100 50 125 –50 –25 ...

Page 4

LTC1694 W BLOCK DIAGRA 100 A SMBus1 5 GND 2 SMBus2 4 TEST CIRCUITS SMBus1 CC C1 LTC1694 0 GND SMBus2 – LT1360 + TEST RAMP VOLTAGE 4 ...

Page 5

U U APPLICATIO S I FOR ATIO SMBus Overview SMBus communication protocol employs open-drain drivers with resistive or current source pull-ups. This protocol allows multiple devices to drive and monitor the bus without bus contention. The simplicity of resistive or ...

Page 6

LTC1694 U U APPLICATIO S I FOR ATIO R : The maximum on resistance of the open- ON(MAX) drain driver I : The maximum LTC1694 low pull-up cur- PULL-UP(MAX) rent is 350 A Fall Time Fall time is a function ...

Page 7

... MOLD FLASH SHALL NOT EXCEED 0.254mm 5. PACKAGE EIAJ REFERENCE IS SC-74A (EIAJ) Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. W ...

Page 8

... PMOS Linear Regulator with 180mA Output Current, SMBus-Controlled 6-Bit DAC Two 0.4 , 300mA N-Channel Switches 94% Efficiency with Input Current Limiting 1.25A, 200kHz, Floating or Grounded Lamp Configurations R PULL-UP = 10.5k 1 s/DIV 1694 TA04 CHG 1694f LT/TP 0400 4K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1998 ...

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