ASM5P2304B Datasheet, PDF (1/13 Pages) Alliance Semiconductor Corporation – 3.3V Zero Delay Buffer

September 2005
ASM5P2304B
rev 0.5
3.3V Zero Delay Buffer
Features
ƒ Zero input - output propagation delay, adjustable
by capacitive load on FBK input.
ƒ Multiple configurations - Refer “ASM5P2304B
Configurations Table”.
ƒ Input frequency range: 4MHz to 20MHz
ƒ Multiple low-skew outputs.
ƒ Output-output skew less than 200pS.
ƒ Device-device skew less than 500pS.
ƒ Two banks of four outputs.
ƒ Less than 200pS Cycle-to-Cycle jitter
(-1, -1H, -2, -2H).
ƒ Available in space saving, 8-pin 150 mil SOIC
Package.
ƒ 3.3V operation.
ƒ Advanced 0.35µ CMOS technology.
ƒ Industrial temperature available.
Functional Description
ASM5P2304B is a versatile, 3.3V zero-delay buffer
designed to distribute high-speed clocks in PC,
workstation, datacom, telecom and other high-performance
applications. It is available in an 8 pin package. The part
has an on-chip PLL, which locks to an input clock,
presented on the REF pin. The PLL feedback is required to
be driven to FBK pin, and can be obtained from one of the
outputs. The input-to-output propagation delay is
guaranteed to be less than 250pS, and the output-to-output
skew is guaranteed to be less than 200pS.
The ASM5P2304B has two banks of two outputs each.
Multiple ASM5P2304B devices can accept the same input
clock and distribute it. In this case the skew between the
outputs of the two devices is guaranteed to be less than
500pS.
The ASM5P2304B is available in two different
configurations (Refer “ASM5P2304B Configurations Table).
The ASM5P2304B-1 is the base part, where the output
frequencies equal the reference if there is no counter in the
feedback path. The ASM5P2304B-1H is the high-drive
version of the -1 and the rise and fall times on this device
are much faster. The ASM5P2304B-2 allows the user to
obtain REF and 1/2X or 2X frequencies on each output
bank. The exact configuration and output frequencies
depend on which output drives the feedback pin.
Block Diagram
FBK
PLL
REF
CLKA1
CLKA2
/2
Extra Divider (-2)
CLKB1
CLKB2
Alliance Semiconductor
2575 Augustine Drive • Santa Clara, CA • Tel: [phone] • Fax: [phone] • www.alsc.com
Notice: The information in this document is subject to change without notice.