HD74CDCV857A Просмотр технического описания (PDF) - Hitachi -> Renesas Electronics
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HD74CDCV857A Datasheet PDF : 13 Pages
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HD74CDCV857A
2.5-V Phase-lock Loop Clock Driver
ADE-205-693A (Z)
Preliminary
Rev.1
Jun. 2002
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
• 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 Hitachi 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
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