Cypress manual Features, Logic Block Diagram, Device Comparison CY24271 CY24272, Pll

CY24272

Rambus→ XDR™ Clock Generator with Zero SDA Hold Time

Features

■Meets Rambus→ Extended Data Rate (XDR™) clocking requirements

■25 ps typical cycle-to-cycle jitter

❐ –135 dBc/Hz typical phase noise at 20 MHz offset

■100 or 133 MHz differential clock input

■300–667 MHz high speed clock support

■Quad (open drain) differential output drivers

■Supports frequency multipliers: 3, 4, 5, 6, 9/2 and 15/4

■Spread Aware™

■2.5V operation

■28-pin TSSOP package

Table 1. Device Comparison

CY24271	CY24272
SDA hold time = 300 ns	SDA hold time = 0 ns
(SMBus compliant)	(I2C compliant)
RRC = 200Ω typical	RRC = 295Ω minimum
(Rambus standard drive)	(Reduced output drive)

Logic Block Diagram

REFCLK,REFCLKB

	/BYPASS		EN
			EN
			RegA
			CLK0
			CLK0B
			EN
			RegB
	Bypass		CLK1
	MUX		CLK1B
			EN
			RegC
	PLL		CLK2
			CLK2B
			EN
			RegD
			CLK3
			CLK3B
SCL	SDA	ID0	ID1

Cypress Semiconductor Corporation • 198 Champion Court	•	San Jose, CA 95134-1709	•	408-943-2600
Document Number: 001-42414 Rev. **		Revised November 9, 2007

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