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HDMI Switch ICs
3 for input 1 output switch with
Termination sense
correspondence
(Sync with HPD_SINK)
BU16028KV
●Description
BU16028KV is 3 for input 1 output HDMI/DVI switch LSI. Each port supports 2.25Gbps. (HDMI 1.3a)
This device control is simple. It requires only 3.3V source and a few GPIO controls.
Terminated resistors(50Ω) are integrated at input port. When channel is not selected, termination resistors are turned off.
TMDS inputs are high impedance.
This device is integrated equalization function and DDC buffer function, so it can adapt long cable.
●Features
・ Supports 2.25 Gbps signaling rate for 480i/p, 720i/p, and 1080i/p resolution to 12-bit color depth
・ Compatible with HDMI 1.3a
・ 5V tolerance to all DDC and HPD_SINK inputs
・ Integrated DDC buffer
・ Integrated switchable 50Ωreceiver termination
・ Integrated equalizer circuit to adapt long cable
・ HBM ESD protection exceeds 10kV
・ 3.3V fixed supply to TMDS I/Os
・ 64Pin VQFP package
・ ROHS compatible
●Applications
・ Digital TV
・ DVD Player
・ Set-Top-Box
・ Audio Video Receiver
・ Digital Projector
・ DVI or HDMI Switch Box
TECHNICAL NOTE
Sep. 2008
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Summary of Contents for Rohm BU16028KV
- Page 1 BU16028KV ●Description BU16028KV is 3 for input 1 output HDMI/DVI switch LSI. Each port supports 2.25Gbps. (HDMI 1.3a) This device control is simple. It requires only 3.3V source and a few GPIO controls. Terminated resistors(50Ω) are integrated at input port. When channel is not selected, termination resistors are turned off.
- Page 2 ●OUTSIDE DIMENSION CHART BU16028KV 1PIN MARK Lot No. Fig. 1-1 . Outside dimension chart 2/17...
- Page 3 ●BLOCK DIAGRAM TMDS TMDS Drive TMDS TMDS Drive TMDS TMDS Drive TMDS TMDS Drive VSADJ TMDS TMDS TMDS TMDS HPD1 HPD2 HPD3 HPD_SINK HPD_SINK SCL1 SDA1 SCL_SINK Control Logic SCL2 SDA_SINK SDA2 SCL3 SDA3 Fig. 2-1. Block Diagram 3/17...
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Page 4: Pin Assignment
●PIN EXPLANATION 1). PIN ASSIGNMENT (TOP VIEW) Reserve2 HPD2 HPD_SINK SDA2 SDA_SINK SCL2 SCL_SINK BU16028KV (64-pin VQFP) HPD3 1PIN MARK Fig3-1. Pin Location 4/17... - Page 5 2). PIN LIST TERMINAL DESCRIPTION NAME A11, A12, A13, A14 39, 42, 45, 48 Source port 1 TMDS positive inputs A21, A22, A23, A24 54, 57, 60, 63 Source port 2 TMDS positive inputs A31, A32, A33, A34 5, 8, 11, 14 Source port 3 TMDS positive inputs B11, B12, B13, B14 38, 41, 44, 47...
- Page 6 ●EQUIVALENT INPUT AND OUTPUT SCHEMATIC DIAGRAMS TMDS Input Stage TMDS Output Stage HPD Output Stage 50Ω 50Ω HPDn 10mA R-Side I C Input/Output Stage T-Side I C Input/Output Stage SCL_SINK SDA_SINK HPD_SINK ※n=1,2,3 m=1,2,3,4 Fig. 4-1 . I/O pin schematic diagram 6/17...
- Page 7 ●SOURCE SELECTION LOOKUP TABLE CONTROL PINS I/O SELECTED HOT PLUG DETECT STATUS SCL_SINK HPD_SINK HPD1 HPD2 HPD3 SDA_SINK A1/B1 Terminations of A2/B2 SCL1 and A3/B3 are SDA1 disconnected A2/B2 Terminations of A1/B1 SCL2 and A3/B3 are SDA2 disconnected A3/B3 Terminations of A1/B1 SCL3 and A2/B2 are SDA3...
- Page 8 ●ERECTRICAL SPECIFICATIONS 1.） ABSOLUTE MAXIMUM RATINGS Over operating free-air temperature range (unless otherwise noted) ITEM MIN. TYP. MAX. UNIT -0.3 Power supply voltage (Vcc) -0.3 DDC, HPD_SINK input voltage Differential input voltage -0.3 S1, S2 input voltage 1250 Power dissipation ℃...
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Page 9: Electrical Characteristics
3.） ELECTRICAL CHARACTERISTICS Over recommended operating conditions (unless otherwise noted) LIMITS SYMBOL PARAMETER TEST CONDITIONS UNIT MIN. TYP. MAX. - = Vcc,V = Vcc-0.4V,R VSADJ 4.64kΩ = 50Ω,AVcc = 3.3V Supply current Am/Bm = 2.25 Gbps HDMI data pattern, m = 2,3,4 A1,/B1 = 225 MHz clock = Vcc-0.4V,R VSADJ... - Page 10 LIMITS SYMBOL PARAMETER TEST CONDITIONS UNIT MIN. TYP. MAX. DDC Input and output High-level input voltage Low-level input voltage -0.3 0.35 Input leak current, VI=5.5V ① Input leak current, VI=Vcc ② High-level output current VO=3.6V Low-level input current VIL=GND Low-level output voltage RL=4.7kΩ...
- Page 11 LIMITS SYMBOL PARAMETER TEST CONDITIONS UNIT MIN. TYP. MAX. TMDS DIFFERENTIAL PINS (Y/Z) Propagation delay time low-high-level output Propagation delay time low-high-level output Differential output signal rise time (20%-80%) Differential output signal fall See Figure 5-2, AV = 3.3V, time (20%-80%) = 50Ω...
- Page 12 ●MEASUREMENT SYMBOL AND CIRCUIT AVCC Zo = R TMDS Zo = R TMDS Receiver Driver Figure 5-1. Termination for TMDS Output Driver TMDS TMDS Driver 0.5pF Receiver swing DC Coupled AC Coupled Vcc V Vcc+0.2 V Vcc-0.4 V Vcc-0.2 V 0.4 V ID(pp) -0.4 V...
- Page 13 tsk(D) Figure 5-3. Definition of Intra-Pair Differential Skew Vcc V Port 1 Vcc-0.4 V Vcc-0.4 V Port 2 Vcc V Vcc-0.4 V Port 3 Vcc V Clocking 75mV 75mV Output HI-Z -75mV -75mV Figure 5-4.TMDS Outputs Control Timing Definitions 13/17...
- Page 14 HPD_SINK HPD1 sx(HPD) pdHL(HPD) pdLH(HPD) 2.4V HPD2 HPD3 pdLHRT(DDC) pdLHTR(DDC) pdHLRT(DDC) pdHLTR(DDC) (DDC) SDA_SINK 1.5V SDA1 1.5V SDA2 fTX(DDC) rTX(DDC) fRX(DDC) rRX(DDC) SDA3 RX to TX TX to RX Figure 5-5. DDC and HPD Timing Definitions 14/17...
- Page 15 1). Y and Z terminal ESD Diode notice. Y and Z terminals are connected ESD diode. When VCC＋0.4 < AVCC. BU16028KV flow leak current from AVCC to VCC. In order to minimize leak current. Please use following application. If you use “Repeater” or “output Buffer”...
- Page 16 When HDMI sw output connect to other HDMI sw input like following application. There is possibility that. 1080p(12bit) image isn’t displayed. It‘s depend on receiver IC characteristic. When system is required 1080p (12bit), Rohm doesn’t recommend serial connect application. TMDS...
- Page 17 Direction of product is fixed in a tray. of feed 1.25 +0.05 0.145 −0.03 ° ° −4 ° 0.08 S 0.5 ± 0.1 + 0.05 −0.04 0.08 （Unit:mm) ※When you order , please order in times the amount of package quantity. Catalog No.08T220B'08.9 ROHM ©...
- Page 18 ROHM cannot be held responsible for any damages arising from the use of the products under conditions out of the range of the specifications or due to non-compliance with the NOTES specified in this catalog.
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