557G08LF

2:1 MULTIPLEXER CHIP FOR PCI-EXPRESS GEN1 DATASHEET ICS557-08 Description The ICS557-08 is a 2:1 multiplexer chip that allows the user to select one of the two HCSL (Host Clock Signal Level) input pairs and fans out to one pair of differential HCSL or LVDS outputs. This chip is suited especially for PCI-Express applications, where there is a need to select the PCI-Express clock either locally from the PCI-E card or from the motherboard. Features Packaged in 16-pin TSSOP Pb (lead) free package Operating voltage of 3.3 V Low power consumption Input clock frequency of up to 200 MHz For PCIe Gen2/3 applications, see the 5V41068A Block Diagram VDD OE 3 IN1 IN1 CLK MUX IN2 2 to 1 IN2 CLK 3 SEL GND PD Rr (IREF) IDT® 2:1 MULTIPLEXER CHIP FOR PCI-EXPRESS GEN1 1 ICS557-08 REV L 112111 ICS557-08 2:1 MULTIPLEXER CHIP FOR PCI-EXPRESS GEN1 PCIE MULTIPLEXER Pin Assignment VDD 1 IN1 2 IN1 3 PD 4 IN2 5 IN2 6 OE 7 GND 8 16 SEL 15 CLK 14 CLK 13 GND 12 GND 11 VDD 10 VDD 9 IREF 16-pin (173 mil) TSSOP Select Table SEL 0 1 Input Pair Selected IN2/ IN2 IN1/ IN1 Pin Descriptions Pin Pin Name Pin Type Pin Description 1 VDD Power Connect to +3.3 V. Supply voltage for Input clocks. 2 IN1 Input HCSL true input signal 1. 3 IN1 Input HCSL complimentary input signal 1. 4 PD Input Powers down the chip and tri-states outputs when low. Internal pull-up 5 IN2 Input HCSL true input signal 2. 6 IN2 Input HCSL complimentary input signal 2. 7...