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LTC4315IMS#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LTC4315
1
4315f
TYPICAL APPLICATION
FEATURES DESCRIPTION
2-Wire Bus Buffer with
High Noise Margin
The LTC4315 is a hot-swappable 2-wire bus buffer
that provides bidirectional buffering, while maintain-
ing a low offset voltage and high noise margin up to
0.3 • V
CC
. The high noise margin allows the LTC4315 to be
interoperable with devices that drive a high V
OL
(>0.4V)
and allows multiple LTC4315s to be cascaded. The LTC4315
supports level translation between 1.5V, 1.8V, 2.5V, 3.3V
and 5V busses.
During insertion, the SDA and SCL lines are precharged to
1V t o m i n i m i z e b u s d i s t u r b a n c e s . C o n n e c t i o n i s e s t a b l i s h e d
between the input and output after ENABLE is asserted
high and a stop bit or bus idle condition has been detected
on the SDA and SCL pins.
If both data and clock are not simultaneously high at
least once in 45ms and DISCEN is high, a FAUL T signal
is generated indicating a stuck bus low condition and the
input is disconnected from the output. Up to 16 clock
pulses are subsequently generated to free the stuck bus.
A three state ACC pin enables input and output side rise
time accelerators of various strengths.
400kHz Operation
APPLICATIONS
n
Bidirectional Buffer Increases Fanout
n
High Noise Margin with V
IL
= 0.3 • V
CC
n
Compatible with Non-Compliant I
2
C Devices That
Drive a High V
OL
n
Selectable Rise Time Accelerator Current
n
Level Shift 1.5V, 1.8V, 2.5V, 3.3V and 5V Busses
n
Prevents SDA and SCL Corruption During Live Board
Insertion and Removal from Backplane
n
Stuck Bus Disconnect and Recovery
n
Compatible with I
2
C, I
2
C Fast Mode and SMBus
n
±4kV Human Body Model ESD Ruggedness
n
High Impedance SDA, SCL pins When Unpowered
n
12-Lead (4mm × 3mm) DFN and 12-Lead MSOP
Packages
n
Capacitance Buffers/Bus Extender
n
Live Board Insertion
n
Telecommunications Systems Including ATCA
n
Level Translation
n
PMBus
n
Servers
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap
is a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners. Protected by U.S. patents, including 6356140, 6650174, 7032051, 7478286.
LTC4315
GND
V
CC
V
CC2
4315 TA01a
READY
SCLOUT
SDAOUT
FAULT
DISCEN
ENABLE
SCLIN
SDAIN
ACC
SCL1
SDA1
2.7k2.7k0.01µF
3.3V
READY
SCL2
SDA2
FAULT
1.3k10k
5V
10k1.3k
1V/DIV
500ns/DIV
4315 TA01b
SCLIN
SCLOUT
R
BUS_IN
= 2.7k, C
BUS_IN
= 50pF
R
BUS_OUT
= 1.3k, C
BUS_OUT
= 400pF, ACC = 0V
LTC4315
2
4315f
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
Supply Voltages V
CC
, V
CC2
........................... –0.3V to 6V
Input Voltages ACC, DISCEN, ENABLE ......... –0.3V to 6V
Input/Output Voltages SDAIN, SCLIN, SCLOUT,
SDAOUT ....................................................... –0.3V to 6V
Output Voltages FAULT, READY ................... –0.3V to 6V
Output Sink Currents
FAULT, READY ...................................................50mA
(Notes 1, 2)
12
11
10
9
8
7
13
1
2
3
4
5
6
V
CC
V
CC2
SDAOUT
SDAIN
FAULT
READY
ENABLE
DISCEN
SCLOUT
SCLIN
ACC
GND
TOP VIEW
DE PACKAGE
12-LEAD (4mm × 3mm) PLASTIC DFN
T
JMAX
= 150°C, θ
JA
= 43°C/W
EXPOSED PAD (PIN 13) PCB CONNECTION TO GND IS OPTIONAL
1
2
3
4
5
6
ENABLE
DISCEN
SCLOUT
SCLIN
ACC
GND
12
11
10
9
8
7
V
CC
V
CC2
SDAOUT
SDAIN
FAULT
READY
TOP VIEW
MS PACKAGE
12-LEAD PLASTIC MSOP
T
JMAX
= 150°C, θ
JA
= 135°C/W
ORDER INFORMATION
Operating Ambient Temperature Range
LTC4315C ................................................ 0°C to 70°C
LTC4315I.............................................. –40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MSOP ............................................................... 300°C
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4315CDE#PBF LTC4315CDE#TRPBF 4315 12-Lead (4mm × 3mm) DFN 0°C to 70°C
LTC4315IDE#PBF LTC4315IDE#TRPBF 4315 12-Lead (4mm × 3mm) DFN –40°C to 85°C
LTC4315CMS#PBF LTC4315CMS#TRPBF 4315 12-Lead Plastic MSOP 0°C to 70°C
LTC4315IMS#PBF LTC4315IMS#TRPBF 4315 12-Lead Plastic MSOP –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
LTC4315
3
4315f
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply/Start-Up
V
CC
Input Supply Voltage
l
2.9 5.5 V
V
DD,BUS
2-Wire Bus Supply Voltage (Note 3)
l
1.4 5.5 V
V
CC2
Output Side Accelerator
Supply Voltage
l
2.25 5.5 V
I
CC
Input Supply Current V
ENABLE
= V
CC
= V
CC2
= 5.5V, V
SDAIN,SCLIN
= 0V (Note 4)
l
6 8.1 10 mA
I
CC(DISABLED)
Input Supply Current V
ENABLE
= 0V, V
CC
= V
CC2
= 5.5V, V
SDAIN,SCLIN
= 0V
l
2.3 3.3 4.3 mA
I
CC2
V
CC2
Supply Current V
ENABLE
= V
CC
= V
CC2
= 5.5V, V
SDAIN,SCLIN
= 0V (Note 4)
l
0.2 0.31 0.4 mA
I
CC2(DISABLED)
V
CC2
Supply Current V
ENABLE
= 0V, V
CC
= V
CC2
= 5.5V, V
SDAIN,SCLIN
= 0V
l
0.15 0.25 0.35 mA
V
TH_UVLO
V
CC
UVLO Threshold V
CC
Rising
l
2.55 2.7 2.85 V
V
CC_UVLO(HYST)
UVLO Threshold Hysteresis
Voltage
200 mV
V
PRE
Precharge Voltage SDA, SCL Pins Open
l
0.8 1 1.2 V
Buffers
V
OS(SAT)
Buffer Offset Voltage I
OL
= 4mA, Driven V
SDA,SCL
= 50mV
l
100 190 280 mV
I
OL
= 500µA, Driven V
SDA,SCL
= 50mV
l
15 60 120 mV
V
OS
Buffer Offset Voltage I
OL
= 4mA, Driven V
SDA,SCL
= 200mV
l
50 120 180 mV
I
OL
= 500µA, Driven V
SDA,SCL
= 200mV
l
15 60 115 mV
V
IL(FALLING)
Buffer Input Logic Low
Voltage
(Notes 5 and 6)
l
0.3 • V
MIN
0.33 • V
MIN
0.36 • V
MIN
V
V
IL(HYST)
V
IL
Hysteresis Voltage 50 mV
I
LEAK
Input Leakage Current SDA, SCL Pins = 5.5V, V
CC
= 5.5V, 0V
l
±10 µA
C
IN
Input Capacitance SDA, SCL Pins (Note 7)
l
10 pF
Rise Time Accelerators
dV
dt
(RTA)
Minimum Slew Rate
Requirement
SDA, SCL Pins, V
CC
= V
CC2
= 5V
l
0.1 0.2 0.4 V/µs
V
RTA(TH)
Rise Time Accelerator DC
Threshold Voltage
V
CC
= V
CC2
= 5V (Note 5)
l
0.38 • V
MIN
0.41 • V
MIN
0.44 • V
MIN
V
∆V
ACC
Buffers Off to Accelerator On
Voltage
SDA, SCL Pins, V
CC
= V
CC2
= 5V (Note 5)
l
0.05 • V
MIN
0.07 • V
MIN
V
I
RTA
Rise Time Accelerator Pull-Up
Current
SDA, SCL Pins
ACC Grounded, V
CC
= V
CC2
= 5V (Note 8)
l
15 25 40 mA
ACC Open, V
CC
= V
CC2
= 5V (Note 8)
l
1.5 2.5 3.5 mA
Enable/Control
V
EN(TH)
ENABLE Threshold Voltage
l
1 1.4 1.8 V
V
DISCEN(TH)
DISCEN Threshold Voltage
l
1 1.4 1.8 V
I
LEAK
Input Leakage Current DISCEN, ENABLE Pins, V
CC
= 5.5V
l
0.1 ±1 µA
V
ACC(L,TH)
ACC Input Low Threshold
Voltage
V
CC
= 5V
l
0.2 • V
CC
0.3 • V
CC
0.4 • V
CC
V
V
ACC(H,TH)
ACC Input High Threshold
Voltage
V
CC
= 5V
l
0.7 • V
CC
0.8 • V
CC
0.9 • V
CC
V
I
ACC(IN,HL)
ACC High, Low Input Current V
CC
= V
CC2
= 5V, V
ACC
= 5V, 0V
l
±23 ±40 µA
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= V
CC2
= 3.3V unless otherwise noted.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC4315IMS#TRPBF

Mfr. #:
Buy LTC4315IMS#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Interface - Signal Buffers, Repeaters 2-Wire Bus Buffer with High Noise Margin w/ FAULT and SBDR Disable
Lifecycle:
New from this manufacturer.
Delivery:
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