Analog Devices Inc. LTC4307IMS8#TRPBF

View All Signal Buffers, Repeaters, Splitters by Analog Devices Inc.

Part Number:
LTC4307IMS8#TRPBF
Manufacturer:
Analog Devices Inc.
Category:
Signal Buffers, Repeaters, Splitters
RoHs:
Non-RoHS Compliant
Datasheet:
Description:
Buffer, Accelerator 2 Channel 400kHz 8-MSOP
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Overview

LTC4307IMS8#TRPBF – Complete Datasheet Summary

1. Basic Identification

Full Part Number: LTC4307IMS8#TRPBF
Manufacturer: Analog Devices (Linear Technology)
Device Type: Hot‑Swappable I²C/SMBus Bidirectional Buffer with Stuck Bus Recovery
Grade: Industrial (‑40°C to +85°C)
Package: 8‑Lead MSOP (MS8)
Packaging: Tape‑and‑Reel (TR)
RoHS / Green: Lead‑free, Halogen‑free (#PBF)
Document: 4307f Rev. F
ESD Rating: ±5 kV HBM on I/O pins
Key Function: Isolates bus capacitance, enables live card insertion, auto‑recovers stuck bus

2. Key Features

±5 kV HBM ESD protection on SDA/SCL lines
60 mV typ buffer offset (load‑independent)
30 ms stuck‑low timeout with auto‑recovery clocking
1 V precharge on SDA/SCL during insertion to minimize bus disturbance
High impedance when VCC = 0 V
Compatible with I²C Fast‑Mode (400 kHz) and SMBus
READY open‑drain status output
Ultra‑small 3 mm × 3 mm DFN or 8‑lead MSOP
Prevents bus corruption during live board swap

3. Absolute Maximum Ratings

Parameter	Rating	Unit
Supply Voltage (VCC)	‑0.3 to +6.0	V
I/O Voltage (SDA, SCL, ENABLE, READY)	‑0.3 to +6.0	V
Continuous Sink Current	50	mA
Operating Temperature (I‑grade)	‑40 to +85	°C
Storage Temperature (MSOP)	‑65 to +150	°C
Lead Temp (soldering, 10 s)	300	°C

4. Electrical Specifications (TA = ‑40°C to +85°C, VCC = 3.3 V)

Power Supply

Parameter	Min	Typ	Max	Unit
Supply Voltage Range	2.3	—	5.5	V
Quiescent Current (ICC)	—	8	11	mA
Shutdown Current (ENABLE = GND)	—	900	1200	μA
Precharge Voltage (VPRE)	0.8	1.0	1.2	V

Logic Thresholds

Parameter	Typ	Max	Unit
ENABLE Threshold (VH)	1.4	—	V
ENABLE Threshold (VL)	0.8	—	V
SDA/SCL Input Threshold	0.55×VCC	—	V
Hysteresis	—	50	mV

Bus Buffer Performance

Parameter	Min	Typ	Max	Unit
Input‑Output Offset (VOS)	20	60	100	mV
Output Low Voltage (VOL, 4 mA sink)	—	—	0.4	V
Propagation Delay (High→Low)	—	70	—	ns
Propagation Delay (Low→High)	—	10	—	ns
Rise Time Accelerator Current	5	8	—	mA
Bus Stuck Timeout	25	30	35	ms
Max I²C Frequency	—	400	—	kHz

5. Pin Configuration (8‑Lead MSOP, Top View)

Pin	Name	Function
1	ENABLE	Connection enable (active high)
2	SCLOUT	Clock output to card
3	SCLIN	Clock input from backplane
4	GND	Ground
5	READY	Open‑drain status output
6	SDAIN	Data input from backplane
7	SDAOUT	Data output to card
8	VCC	Supply voltage (2.3–5.5 V)

6. Package & Mechanical

Package: 8‑Lead MSOP (MS8)
Dimensions: 3.0 mm × 4.9 mm × 1.10 mm
Lead Pitch: 0.65 mm
Thermal Resistance (θJA): 200 °C/W
Moisture Sensitivity: MSL 1
Marking: LTBTV

7. Functional Description

Hot‑Swap Safe: 1 V precharge eliminates glitches during insertion
Bidirectional Buffer: Isolates backplane and card capacitance
Stuck Bus Recovery: Automatically generates up to 16 clocks to release locked bus
Enable Control: Disconnects bus when low; connects at stop/idle when high
READY Indicator: Low = disconnected; High = connected
Rise‑Time Accelerators: Improve signal transition and noise immunity

8. Typical Applications

Live card insertion into active backplanes
I²C/SMBus bus isolation & capacitance buffering
Server, RAID, and ATCA systems
Hot‑swap I²C bus extenders
Mixed‑voltage I²C interfaces
High‑node‑count I²C networks

9. Ordering Information

Part Number: LTC4307IMS8#TRPBF
Temp: ‑40°C to +85°C (Industrial)
Package: 8‑Lead MSOP
Packing: Tape‑and‑Reel
RoHS: Lead‑free, halogen‑free

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