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OQ2536HP Datasheet(PDF) 7 Page - NXP Semiconductors |
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OQ2536HP Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 20 page  1998 Mar 10 7 Philips Semiconductors Product specification SDH/SONET STM16/OC48 demultiplexer OQ2536HP FUNCTIONAL DESCRIPTION The OQ2536HP is a 32-channel demultiplexer, intended for use in STM16/OC48 applications. It demultiplexes a single 2.5 Gbits/s input channel to 32 × 78 Mbits/s output channels. The demultiplexing is performed in two stages. The 2.5 Gbits/s data channel is first demultiplexed to four 622 Mbits/s data channels. Each of these channels is then fed to a 1 : 8 demultiplexer to generate 32 × 78 Mbits/s output channels. The ENL control input is used for switching between normal and loop modes. When loop mode is enabled (ENL = LOW), inputs DLOOP, DLOOPQ, CLOOP and CLOOPQ are selected. In normal mode (ENL = HIGH), inputs DIN, DINQ, CIN and CINQ are selected. The signal applied to CIN and CINQ is a 2.5 GHz recovered clock signal, e.g. coming from the OQ2541 data and clock recovery IC. The clock is divided down to 78 MHz, which is used for receive logic timing and is available as a GTL compatible output at pin CDIV. High bit rate stage: 1 : 4 DMUX The 2.5 Gbits/s data stream is fed into a 1 : 4 demultiplexer to generate four 622 Mbits/s channels. The input pins DIN, DINQ, DLOOP, DLOOPQ, CIN, CINQ, CLOOP and CLOOPQ are terminated internally with 50 Ω resistors to GND. Low bit rate part: 4 × 1 : 8 DMUX The four 622 Mbits/s output channels coming from the high bit rate stage are loaded into four 8-bit shift registers. The 622 MHz clock for these shift registers comes from the preceding stage. The 32 bits contained in the shift registers are loaded into latches and made available on outputs D0 to D31. These outputs are 1.2 V GTL compatible and have internal 100 Ω pull up resistors. The 78 MHz clock output, CDIV, has an internal 50 Ω pull up resistor. The first serial data bit coming in at DIN or DLOOP is given out at pin D31 (MSB) and so on. The data outputs may not always represent four STM bytes. This is because the internal load pulse for the output latches is not synchronized to the STM16 frame. Power supply connections The power supply pins need to be individually decoupled using chip capacitors mounted as close as possible to the IC. If multiple decoupling capacitors are used for a single supply node, large distance between the capacitances should be avoided in order to avoid resonance. To minimize low frequency switching noise in the vicinity of the OQ2536HP, all power supply lines should be filtered once by an LC-circuit with a low cutoff frequency (as shown in the application diagram, Fig.7). Ground connection The ground connection on the PCB needs to be a large copper area fill connected to a common ground plane with low inductance. RF connections A coupled stripline or microstrip with an odd mode characteristic impedance of 50 Ω (nominal value) should be used for the RF connections on the PCB. The connections should be kept as short as possible. This applies to the CML differential line pairs CIN and CINQ, DIN and DINQ, CLOOP and CLOOPQ, and DLOOP and DLOOPQ. In addition, the following lines should not vary in length by more than 5 mm: • CIN, CINQ, DIN and DINQ • DLOOP, DLOOPQ, CLOOP and CLOOPQ. Interface to receive logic The 78 Mbits/s interface lines, CDIV and D0 to D31, should not exceed 50 mm in length. The parasitic capacitance of these lines should be as small as possible (less than 3 pF is desirable). ESD protection All pads are protected by ESD protection diodes, with the exception of the high frequency inputs DIN, DINQ, DLOOP, DLOOPQ, CIN, CINQ, CLOOP and CLOOPQ. Cooling In many cases it is necessary to mount a special cooling device on the package. The thermal resistance from junction to case, Rth j-c and from junction to ambient, Rth j-a, are given in Chapter “Thermal characteristics”. Since the heat-slug in the package is connected to the die, the cooling device should be electrically isolated. To calculate if a heatsink is necessary, the maximum allowed total thermal resistance R is calculated as: (1) R th T j T amb – P tot ------------------------ = |
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