LTC4300A-2 Linear Technology, LTC4300A-2 Datasheet
LTC4300A-2
Available stocks
Related parts for LTC4300A-2
LTC4300A-2 Summary of contents
Page 1
... Both the backplane and card may be powered with supply voltages ranging from 2.7V to 5.5V, with no contraints on which supply voltage is higher. The LTC4300A-2 also re- places the READY pin with a digital CMOS input pin, ACC, which enables and disables the rise-time accelerator currents. ...
Page 2
... W ABSOLUTE AXI U RATI GS (Note GND .................................................... – 0 GND (LTC4300A-2) ........................... – 0 CC2 SDAIN, SCLIN, SDAOUT, SCLOUT ................. – 0 READY, ENABLE (LTC4300A-1) .................... – 0 ACC (LTC4300A-2) ........................................ – 0 Operating Temperature Range LTC4300A-1C/LTC4300A-2C ................... LTC4300A-1I/LTC4300A-2I ................ – www.DataSheet4U.com Storage Temperature Range ................. – ...
Page 3
... The denotes the specifications which apply over the full operating = 2.7V to 5.5V, unless otherwise noted CONDITIONS Positive Transition on SDA,SCL 2.7V, CC Slew Rate = 1.25V/ s (Note 2), LTC4300A-2, ACC = 0.7 • 2.7V CC2 CC2 LTC4300A-2 LTC4300A-2 LTC4300A-2 LTC4300A-2 10k SDA, SCL 3.3V (Note 3), ...
Page 4
... LTC4300A-1/LTC4300A-2 TYPICAL PERFOR A CE CHARACTERISTICS I vs Temperature (LTC4300A-1) CC 5.3 5.2 5.1 5.0 4.9 4.8 www.DataSheet4U.com 4.7 4.6 4.5 4.4 4.3 –40 TEMPERATURE ( Temperature PULLUPAC –50 –25 0 TEMPERATURE ( 5. 2. 4300-1/2 G01 2. 100 4300-1/2 G03 Input – Output t vs Temperature ...
Page 5
... SDAIN from SDAOUT and isolates SCLIN from SCLOUT. Drive ENABLE all the way to V operation. Connect ENABLE to V being used. For the LTC4300A-2, this is the supply voltage for the devices on the card I resistors from SDAOUT and SCLOUT to this pin ...
Page 6
... LTC4300A-1/LTC4300A-2 W BLOCK DIAGRA SDAIN 6 www.DataSheet4U.com SCLIN 3 + – + 0.55V / – CC 0.45V UVLO DELAY, RISING ENABLE 1 ONLY 6 (LTC4300A-1) 2-Wire Bus Buffer and Hot Swap 2mA SLEW RATE DETECTOR BACKPLANE-TO-CARD CONNECTION CONNECT CONNECT ENABLE 100k RCH1 1V PRECHARGE 100k RCH2 2mA SLEW RATE ...
Page 7
... CONNECTION CONNECT 100k RCH1 1V PRECHARGE 100k RCH2 2mA SLEW RATE DETECTOR BACKPLANE-TO-CARD CONNECTION CONNECT STOP BIT AND BUS IDLE 0.5 A 20pF 0.5pF LTC4300A-1/LTC4300A-2 2mA SLEW RATE DETECTOR CONNECT CONNECT 100k RCH3 100k RCH4 2mA SLEW RATE DETECTOR + CONNECT – + – ...
Page 8
... SDA and SCL pins until V the LTC4300A-2, the part also waits for V 2V. This ensures that the part does not try to function until it has enough voltage to do so. ...
Page 9
... Start-Up section) before reconnecting the two sides. This feature is available for the LTC4300A-1 only. ACC Boost Current Enable (LTC4300A- Users having lightly loaded systems may wish to disable the rise-time accelerators ...
Page 10
... LTC4300A-1/LTC4300A APPLICATIO S I FOR ATIO Resistor Pull-Up Value Selection The system pull-up resistors must be strong enough to provide a positive slew rate of 1.25V the SDA and SCL pins, in order to activate the boost pull-up currents during rising edges. Choose maximum resistor value R ...
Page 11
... V CC SDA SCL R1 R2 10k 10k Figure 4. Inserting Multiple I/O Cards into a Live Backplane Using the LTC4300A CompactPCI System LTC4300A-1/LTC4300A monitored by a filtered UVLO circuit. With the V CC voltage powering up after all other pins have established connection, the UVLO circuit ensures that the backplane and card data and clock busses are not connected until the transients associated with live insertion have settled ...
Page 12
... LTC4300A-1/LTC4300A APPLICATIO S I FOR ATIO of the connector and the LTC4300A-2, as shown in the figure. In addition, make sure that the V the backplane is large compared to the 0.01 F bypass capacitor on the card. Establishing early power V sures that the 1V precharge voltage is present at the SDAIN and SCLIN pins before they make contact. Connect ...
Page 13
... U U APPLICATIO S I FOR ATIO BACKPLANE CONNECTOR BACKPLANE V CC2 R1 R2 10k 10k V CC SDA SCL www.DataSheet4U.com Figure 6. Inserting Multiple I/O Cards into a Live Backplane Using the LTC4300A-2 with a Custom Connector 10k 10k SDA1 SCL1 TO OTHER SYSTEM 1 DEVICES 0. 0.01 F 2-WIRE SYSTEM ...
Page 14
... Level Translator and Power Supply Redundancy (LTC4300A-2) Systems requiring different supply voltages for the backplane side and the card side can use the LTC4300A-2, as shown in Figure 9. The pull-up resistors on the card side connect from SDAOUT to SCLOUT to V the backplane side connect from SDAIN and SCLIN to V The LTC4300A-2 functions for voltages ranging from 2 ...
Page 15
... PLANE 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. LTC4300A-1/LTC4300A-2 3.00 0.102 (.118 .004) 0.52 (NOTE 3) ( ...
Page 16
... SCLIN GND Figure 8. System with Disparate 0.01 F 10k 10k V V SDAIN CC CC2 U1 SCL SCLIN LTC4300A-2 GND Figure 3.3V Level Translator TM C Fan Speed Controller in ThinSOT www.linear.com 10k 10k 10k SDAOUT SDA2 SCLOUT SCL2 READY 4300-1/2 F08 Voltages ...