Document
SSOP16
IP4770/71/72CZ16
VGA/video interface with integrated buffers, ESD protection and integrated termination resistors
Rev. 2 — 19 May 2011
Product data sheet
1. General description
The IP4770CZ16, IP4771CZ16, IP4772CZ16 is connected between the VGA/DVI interface and the video graphics controller and includes level shifting for the DDC signals, buffering for the SYNC lines as well as high-level ESD protection diodes for the RGB signal lines.
The level shifting functions are required when the DDC controller operates at a lower supply voltage than the monitor. To use this level shifting function the gates of the two N-channel MOSFETs have to be connected to the supply rail of the DDC transceivers.
Buffering for the SYNC signals is provided by two non-inverting buffers, which accept TTL input levels and convert these to CMOS compliant output levels between pins VCC(SYNC) and GND.
The IP4770CZ16 and IP4771CZ16 contain the formerly external termination resistors, which are typically required for the HSYNC and VSYNC lines of the video interface:
• IP4770CZ16: Rsync = 55 Ω • IP4771CZ16: Rsync = 65 Ω • IP4772CZ16: Rsync = 10 Ω to allow termination of the SYNC lines
All RGB I/Os are protected by a special diode configuration offering a low line capacitance of 4 pF (maximum) only to provide protection to downstream components for ESD voltages as high as ±8 kV contact discharge according to IEC 61000-4-2, level 4 standard.
2. Features and benefits
Integrated high-level ESD protection, buffering, SYNC signal impedance matching and level shifting
Terminal connections with integrated rail-to-rail clamping diodes with downstream ESD protection of ±8 kV according to IEC 61000-4-2, level 4 standard
Backflow protection on DDC lines Drivers for HSYNC and VSYNC lines Bidirectional level shifting N-channel FETs available for DDC clock and DDC data
channels Integrated impedance matching resistors on SYNC lines Line capacitance < 4 pF per channel Lead-free package and RoHS compliant
NXP Semiconductors
IP4770/71/72CZ16
VGA/video interface
3. Applications
To terminate and to buffer channels, to reduce EMI/RFI and to provide downstream ESD protection for: VGA interfaces including DDC channels Desktop and notebooks PCs Graphics cards Set-top boxes
4. Ordering information
Table 1. Ordering information
Type number Package
Name
Description
IP4770CZ16 IP4771CZ16
SSOP16 plastic shrink small outline package; 16 leads; body width 3.9 mm; lead pitch 0.635 mm
IP4772CZ16
Version SOT519-1
5. Marking
Table 2. Marking codes Type number IP4770CZ16 IP4771CZ16 IP4772CZ16
Marking code 4770 4771 4772
IP4770_71_72CZ16
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 19 May 2011
© NXP B.V. 2011. All rights reserved.
2 of 14
NXP Semiconductors
6. Functional diagram
VCC(SYNC) SYNC_IN1 SYNC_IN2
Rterm Rterm
IP4770/71/72CZ16
VGA/video interface
VCC(VIDEO)
SYNC_OUT1 SYNC_OUT2
VIDEO_1 VID.