LTC1694-1CS5 Linear Technology, LTC1694-1CS5 Datasheet
LTC1694-1CS5
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LTC1694-1CS5 Summary of contents
Page 1
... During negative transitions or steady DC levels, the LTC1694-1 sources zero current. External resistors, one on each bus line, trigger the LTC1694-1 during positive bus transitions and set the pull-down current level. These resistors determine the slew rate during negative bus transitions and the logic low DC level ...
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 INFORMATION ORDER PART TOP VIEW NUMBER 5 SMBus1 LTC1694-1CS5 4 SMBus2 S5 PART MARKING S5 PACKAGE LTHE = 256 MIN TYP MAX 2.7 6 ...
Page 3
... 2. 2.7V 1.75 CC 1.50 1.25 1.00 – 100 –25 TEMPERATURE ( C) 1694-1 G01 LT1694 G02 75 100 125 1694 G04 LTC1694-1 125 Input Threshold Voltage 0.90 0.85 0. 0.65 0. 2.7V CC 0.55 0.50 0.45 0.40 –50 – 100 125 TEMPERATURE ( C) 1694 G03 Standby Mode Supply Current ...
Page 4
... SMBus1 5 GND 2 SMBus2 4 TEST CIRCUITS SMBus1 CC C1 LTC1694-1 0 GND SMBus2 – ® LT 1360 + TEST RAMP VOLTAGE 4 can range from 2.7V NC (Pin 3): No Connection. SMBus2 (Pin 4): Active pull-up for SMBus SMBus1 (Pin 5): Active pull-up for SMBus. SLEW RATE 2 ...
Page 5
... SMBus is at logic zero. This pull-up current is used for slewing the SMBus line during the initial portion of the positive transi- tion in order to activate the LTC1694-1 2.2mA pull-up current. Using an external R to supply the steady state pull-up ...
Page 6
... V ) • IHMIN THRES For an SMBus system 0.8V and V ILMAX For the LTC1694-1, typically V THRES = 2.2mA the total capacitance of the SMBus line. BUS Increasing the value of R increases the rise time. P SMBus Fall Time Fall time of an SMBus line is derived using equation 7: ...
Page 7
... SCL SMBus SDA Figure 3. Paralleling Two LTC1694-1 to Provide 4.4mA of Pull-Up Current 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. ...
Page 8
... LTC1694 APPLICATIONS INFORMATION Comparison of SMBus Waveforms for the LTC1694-1 vs Resistor Pull-Up LTC1694-1 1V/DIV R PULL-UP = 15. s/DIV 200pF 100kHz SMBus PACKAGE DESCRIPTION 2.60 – 3.00 (0.102 – 0.118) 1.50 – 1.75 (0.059 – 0.069) 0.35 – 0.55 (0.014 – 0.022) 0.09 – 0.20 (0.004 – 0.008) NOTE: 1 ...