557G-08LF Renesas

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