HD74CDCV857A 데이터 시트보기 (PDF) - Renesas Electronics
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HD74CDCV857A Datasheet PDF : 13 Pages
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HD74CDCV857A
2.5-V Phase-lock Loop Clock Driver
REJ03D0136–0300Z
(Previous ADE-205-693B (Z))
Rev.3.00
Oct.09.2003
Description
The HD74CDCV857A is a high-performance, low-skew, low-jitter, phase locked loop clock driver. It is
specifically designed for use with DDR (Double Data Rate) synchronous DRAMs.
Features
• DDR333 / PC2700-Compliant, also meets DDR266 / PC2100 requirement.
• Supports 60 MHz to 170 MHz operation range
• Distributes one differential clock input pair to ten differential clock outputs pairs
• Supports spread spectrum clock requirements meeting the PC100 SDRAM registered DIMM
specification
• External feedback pins (FBIN, FBIN) are used to synchronize the outputs to the clock input
• Supports 2.5V analog supply voltage (AVCC), and 2.5 V VDDQ
• No external RC network required
• Sleep mode detection
• 48pin TSSOP (Thin Shrink Small Outline Package)
Function Table
Inputs
: Outputs
AVCC PWRDWN CLK
CLK
:Y
Y
GND H
L
H
:L
H
GND H
H
L
:H
L
X
L
L
H
:Z
Z
X
L
H
L
:Z
Z
2.5 V H
L
H
:L
H
2.5 V H
H
L
:H
L
2.5 V X
Input clock frequency
:Z
Z
60 to 170 MHz → 0 MHz
H : High level
L : Low level
X : Don’t care
Z : High impedance
Notes: 1. Bypassed mode is used for RENESAS test mode.
FBOUT FBOUT :
L
H
:
H
L
:
Z
Z
:
Z
Z
:
L
H
:
H
L
:
Z
Z
:
PLL
Bypassed / off *1
Bypassed / off *1
off
off
on
on
off
Rev.3.00, Oct.09.2003, page 1 of 12
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