CDCR61A Datasheet, PDF (1/10 Pages) Texas Instruments – DIRECT RAMBUSE CLOCK GENERATOR- LITE

CDCR61A
DIRECT RAMBUS™ CLOCK GENERATOR – LITE
D 400-MHz Differential Clock Source for
Direct Rambus Memory Systems for an
800-MHz Data Transfer Rate
D Operates From Two (3.3-V and 1.80-V)
Power Supplies With 180 mW (Typ) at 400
MHz Total
D Packaged in a Thin Shrink Small-Outline
Package (PW)
D External Crystal Required for Input
description
V_DDP
GNDP
XOUT
XIN
V_DDL
LCLK
GNDL
S1
SCAS626 – FEBRUARY 2000
PW PACKAGE
(TOP VIEW)
1
16
S0
2
15
V_DD
3
14
GND
4
13
CLK
5
12
CLKB
6
11
GND
7
10
V_DD
8
9
S2
The Direct Rambus clock generator – lite (DRCG-Lite) is an independent crystal clock generator. It performs
clock multiplication using PLL, sourced by an internal crystal oscillator. It provides one differential, high-speed
Rambus channel compatible output pair. Also, one single-ended output is available to deliver 1/2 of the crystal
frequency. The Rambus channel operates at up to 400 MHz with an option to select 300 MHz as well. The
desired crystal is a 18.75-MHz crystal in a series resonance fundamental application.
The CDCR61A is characterized for operation over free-air temperatures of 0°C to 85°C.
functional block diagram
XTAL
XIN
OSC
S0
VDDP
S1 S2
PLL
DIV
2
BUSCLK
XOUT
/2
LCLK
VDDP
ON
ON
ON
ON
0V
0V
0V
0V
S1 S2
00
11
01
10
00
11
01
10
BUSCLK FREQUENCY SETTINGS
S0
M (PLL MULTIPLIER)
0
16
1 or Open
64/3
MODE
Normal
Normal
Test
Test
Test
Test
Test
Test
FUNCTION TABLE
CLK
CLKB
CLK
CLKB
CLK
CLKB
Divided by 2
Divided by 2
Divided by 4
Divided by 4
XIN
XIN (invert)
XIN
XIN (invert)
XIN divided by 2 XIN (invert) divided by 2
XIN divided by 4 XIN (invert) divided by 4
LCLK
XIN divided by 2
XIN divided by 2
XIN divided by 2
XIN divided by 2
XIN divided by 2
XIN divided by 2
XIN divided by 2
XIN divided by 2
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Direct Rambus and Rambus are trademarks of Rambus Inc.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 2000, Texas Instruments Incorporated
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