Datasheet
1
4
3
2
LMH0303
(top view)
12
9
10
11
85 6 7
1316 15 14
V
EE
SDI
SDI
SDO
SD/HD
V
CC
ENABLE
SCL
NC
NC
R
REF
SDO
SDA
RSTI RSTO
FAULT
LMH0303
SNLS285G –APRIL 2008–REVISED APRIL 2013
www.ti.com
Connection Diagram
The exposed die attach pad is a negative electrical terminal for this device. It should be connected to the negative
power supply voltage.
Figure 1. 16-Pin WQFN
Package Number RUM
PIN DESCRIPTIONS
Pin Name Description
1 SDI Serial data true input.
2 SDI Serial data complement input.
3 V
EE
Negative power supply (ground).
4 R
REF
Bias resistor. Connect a 750Ω resistor to V
CC
.
5 RSTI Reset input. RSTI has an internal pullup.
H = Normal operation.
L = Device reset. The device operates with default register settings. Forcing RSTI low also forces
RSTO low.
6 ENABLE Output driver enable. ENABLE has an internal pullup.
H = Normal operation.
L = Output driver powered off.
7 SDA SMBus bidirectional data pin. When functioning as an output, it is open drain. This pin requires an
external pullup.
8 SCL SMBus clock input. SCL is input only. This pin requires an external pullup.
9 V
CC
Positive power supply (+3.3V).
10 SD/HD Output slew rate control. SD/HD has an internal pulldown.
H = Output rise/fall time complies with SMPTE 259M.
L = Output rise/fall time complies with SMPTE 424M / 292M.
11 SDO Serial data complement output.
12 SDO Serial data true output.
13 FAULT Fault open drain output flag. Requires external pullup resistor and may be wire ORed with multiple
cable drivers.
H = Normal operation.
L = Loss of signal or termination fault for any output.
14 NC No connect. Not bonded internally.
15 NC No connect. Not bonded internally.
16 RSTO Reset output. RSTO is automatically set to 1 when register 0 is written. It can be reset back to zero by
forcing RSTI to zero to reset the device. Used to daisy chain multiple cable drivers on the same
SMBus.
DAP V
EE
Connect exposed DAP to negative power supply (ground).
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