to GND .................................................. –0.3V to 7V
SDAIN, SCLIN, SDAOUT, SCLOUT, READY, ENABLE,
FAULT, ACC .................................................. –0.3V to 7V
Operating Temperature
LTC4304C ................................................ 0°C to 70°C
LTC4304I .............................................–40°C to 85°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ENABLE
SCLOUT
SCLIN
ACC
GND
1
2
3
4
5
11
10 V
CC
9 SDAOUT
8 SDAIN
7 FAULT
6 READY
DD PACKAGE
10-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W
EXPOSED PAD (PIN 11)
PCB GND CONNECTION OPTIONAL
ORDER PART NUMBER
LTC4304CDD
LTC4304IDD
DD PART MARKING*
LBBD
LBBD
Order Options
Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
ELECTRICAL CHARACTERISTICS
SYMBOL
Power Supply
V
CC
I
CC
Startup Circuitry
V
PRE
T
IDLE
V
OL_READY
V
THR_ENABLE
I
ENABLE
V
THR
PARAMETER
Positive Supply Voltage
Supply Current
Supply Current, ENABLE = GND
Precharge Voltage
Bus Idle Time
READY Output Low Voltage
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 2.7V to 5.5V, unless otherwise noted.
CONDITIONS
●
V
CC
= 5.5V, V
SDAIN
= V
SDAOUT
= 0V (Note 7)
V
CC
= 5.5V
SDA, SCL Floating, V
CC
= 5.5V
I
PULLUP
= 3mA
I
PULLUP
= 6mA, V
CC
= 4.7V
ENABLE Threshold
ENABLE Input Current
ENABLE from 0 to V
CC
SDA, SCL Logic Input Threshold Voltage Rising Edge
2
U
U
W
W W
U
W
TOP VIEW
ENABLE
SCLOUT
SCLIN
ACC
GND
1
2
3
4
5
10
9
8
7
6
V
CC
SDAOUT
SDAIN
FAULT
READY
MS10 PACKAGE
10-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
=200°C/W
ORDER PART NUMBER
LTC4304CMS
LTC4304IMS
MS PART MARKING*
LTBBC
LTBBC
MIN
2.7
TYP
MAX
5.5
8
UNITS
V
mA
mA
V
µs
V
V
V
µA
V
4304fa
●
6
1.5
0.8
60
1
95
●
●
●
●
●
●
●
1.2
175
0.4
0.4
2
±1.5
2
0.8
1.6
1.4
0.1
1.8
LTC4304
ELECTRICAL CHARACTERISTICS
SYMBOL
V
HYS
t
PLH
t
PHL
I
OFF_READY
PARAMETER
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 2.7V to 5.5V, unless otherwise noted.
CONDITIONS
MIN
TYP
50
300
10
●
●
MAX
UNITS
mV
ns
ns
SDA, SCL, Logic Input Threshold Voltage (Note 6)
Hysteresis
ENABLE Delay On-Off
READY Delay Off-On
ENABLE Delay Off-On
READY Delay On-Off
V
CC
= 3.3V
(Note 6)
V
CC
= 3.3V
(Note 6)
60
95
10
175
±10
µs
ns
µA
mA
ns
V
V
µA
ms
V
µA
mV
mV
pF
V
µA
V
kHz
µs
ns
ns
ns
ns
ns
Ready Off Leakage Current
Rise-Time Accelerators
I
PULLUPAC
Transient Boosted Pull-Up Current
ACC Delay, On/Off
V
IH
Input High Voltage
Input Low Voltage
V
IL
I
IN
ACC Input Current
Bus Stuck Low Timeout
t
TIMEOUT
Bus Stuck Low Timer
V
OLFAULT
FAULT Output Low Voltage
I
OFF_FAULT
Input-Output Connection
V
OS
Input-Output Offset Voltage
t
PDOFF
Positive Transition on SDA, SCL, V
CC
= 2.7V,
Slew Rate = 0.8V/µs (Note 5)
(Note 6)
Measured on ACC
Measured on ACC
ACC Shorted to GND or V
CC
(Note 8)
SDAOUT, SCLOUT = 0V
I
PULLUP
= 3mA
V
CC
= 5.5V
10k to V
CC
on SDA, SCL,
2.7k to V
CC
on SDA, SCL
V
CC
= 3.3V, V
SDA/SCL
= 0.2V (Note 4)
(Note 6)
●
●
●
●
●
●
●
●
2
3.5
5
5.5
0.9V
CC
–100
25
30
0.1V
CC
100
35
0.4
±10
120
150
10
40
50
80
100
C
IN
V
IL, MAX
Digital Input Capacitance
SDAIN, SDAOUT, SCLIN, SCLOUT
Input Logic Low Voltage
I
LEAK
Input Leakage Current
V
OL
Output Low Voltage, Input = 0V
Timing Characteristics
f
I2C, MAX
I
2
C Maximum Operating Frequency
t
BUF
Bus Free Time Between Stop and Start
Condition
t
HD, STA
Hold Time After (Repeated)
Start Condition
t
SU, STA
Repeated Start Condition Set-Up Time
t
SU, STO
t
HD, DATI
t
SU, DAT
Stop Condition Set-Up Time
Data Hold Time Input
Data Set-Up Time
●
SDA, SCL, V
CC
= 5.5V
SDA, SCL Pins, I
SINK
= 4mA, V
CC
= 2.7V
(Note 6)
(Note 6)
(Note 6)
(Note 6)
(Note 6)
(Note 6)
(Note 6)
●
●
0
400
0.19
600
0.4
±5
0.3
1.3
100
0
0
0
100
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
All currents into pins are positive; all voltages are referenced to
GND unless otherwise specified.
Note 3:
Pulsed less than 5µs.
Note 4:
The connection circuitry always regulates the output to a higher
voltage than its input. The magnitude of this offset voltage as a function of
the pull-up resistor and V
CC
voltage is shown in the Typical Performance
Characteristics section.
Note 5:
I
PULLUPAC
varies with temperature and V
CC
voltage, as shown in
the Typical Performance Characteristics section.
Note 6:
Determined by design, not tested in production.
Note 7:
I
CC
test performed with connection circuitry active.
Note 8:
When floating, the ACC pin can tolerate ±5µA of leakage.
4304fa
3
LTC4304
TYPICAL PERFOR A CE CHARACTERISTICS
I
CC
vs Temperature
6.2
6.0
5.8
t
PHL
(ns)
I
CC
(mA)
80
60
40
V
CC
= 2.7V
20
0
–50
2
0
–50
5.6
5.4
5.2
5.0
–50
V
CC
= 5.5V
140
120
100
I
PULLUPAC
(mA)
–25
0
25
50
TEMPERATURE (°C)
Connection Circuitry V
OUT
- V
IN
250
180
200
V
CC
= 5.5V
V
OUT
-V
IN
(mV)
t
PHL
(ns)
150
140
120
100
80
60
50
40
0
1000
20
3000
7000
5000
R
PULLUP
(Ω)
9000
4303 G04
100
V
CC
= 2.7V
4
U W
75
100
4303 G01
T
A
= 25°C unless otherwise indicated.
I
PULLUPAC
vs Temperature
14
12
10
8
6
4
V
CC
= 2.7V
V
CC
= 3.3V
V
CC
= 5.5V
Input-Output t
PHL
vs Temperature
C
IN
= C
OUT
= 100pF
R
PULLUPIN
= R
PULLUPOUT
= 10k
–25
0
25
50
TEMPERATURE (°C)
75
100
4303 G02
–25
0
25
50
TEMPERATURE (°C)
75
100
4303 G03
Input-Output t
PHL
vs C
OUT
C
IN
= 50pF
R
PULLUPIN
= R
PULLUPOUT
= 10k
160
0
500
1000
C
OUT
(pF)
1500
2000
4303 G05
4304fa
LTC4304
PI FU CTIO S
ENABLE (Pin 1):
Connection Enable. This is a digital
threshold input pin. For normal operation ENABLE is high.
Driving ENABLE below 0.8V isolates SDAIN from SDAOUT,
SCLIN from SCLOUT, asserts READY low and disables
automatic clocking. A rising edge on ENABLE after a fault
has occurred unconditionally forces a connection between
SDAIN, SDAOUT and SCLIN, SCLOUT.
SCLOUT (Pin 2):
Serial Clock Output. Connect this pin to
the SCL bus on the card.
SCLIN (Pin 3):
Serial Clock Input. Connect this pin to SCL
on the bus backplane.
ACC (Pin 4):
Rise-Time Accelerator Control. Connect ACC
to V
CC
to disable all four accelerators. Connect ACC to
GND to enable all four accelerators. Float ACC to enable
the SDAOUT and SCLOUT accelerators only. For applica-
tions when V
CC
is greater than the bus pull-up voltage,
connect ACC to V
CC
.
GND (Pin 5):
Device Ground. Connect this pin to a ground
plane for best results.
READY (Pin 6):
Connection Status Flag. READY provides
a digital flag which indicates the status of the connection
circuitry described in the “Connection Circuitry” section.
Connect a resistor of 10k to V
CC
to provide the pull-up.
FAULT (Pin 7):
Bus Stuck Low Fault. FAULT is an open
drain N-channel MOSFET which pulls low to signal a bus
stuck low condition. In normal operation, FAULT is high.
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