MPC9120 データシートの表示（PDF） - Motorola => Freescale
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MPC9120 Datasheet PDF : 6 Pages
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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
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1:10 LVCMOS Fanout Buffer
The MPC9120 is a 1:10 LVCMOS fanout buffer targeted to support
Intel based Pentium II™ microprocessor chip sets. The device features
10 low skew outputs optimized to drive the clock inputs of standard
unbuffered SO–DIMM SDRAM modules. Standard unbuffered SO–DIMM
SDRAM modules require two clocks per module allowing for the device to
drive up to four modules. The output buffers have been optimized to drive
the load presented by the SDRAM module.
The MPC9120 provides output shut off capabilities via an I2C serial
port for applications which plan to use fewer than four modules and desire
to minimize the power dissipation of the chip. Every output clock can be
individually enabled/disabled through fields in the I2C control registers.
After power up the default state is all outputs enabled. In applications
where this default state is acceptable the I2C ports need not be exercised.
• Supports Intel Pentium™ and Pentium II Processor Architectures
• 10 Skew Controlled 3.3V Compatible SDRAM Clocks
• I2C Serial Bus Interface
• Extensive Output Enable Control Capability
• Space Efficient 28–Lead SSOP Package
• Operating Temperature Range of 0°C to 70°C
• 3.3V ± 5% Power Supply
MPC9120
1:10 LVCMOS
FANOUT BUFFER
SD SUFFIX
28–LEAD PLASTIC SSOP PACKAGE
CASE 940E–02
VDD 1
SDRAM0 2
SDRAM1 3
VSSO 4
VDD 5
SDRAM2 6
SDRAM3 7
VSS 8
BUF_IN 9
VDD 10
SDRAM4 11
VSS 12
VDDIIC 13
SDATA 14
28 VDD
27 SDRAM9
26 SDRAM8
25 VSS
24 VDD
23 SDRAM7
22 SDRAM6
21 VSS
20 OE
19 VDD
18 SDRAM5
17 VSS
16 VSSIIC
15 SCLOCK
Figure 1. 28–Lead Pinout (Top View)
FUNCTION TABLE
OE
0
1
V1, V2
High–Z
1x BUF_IN
This document contains information on a product under development. Motorola reserves the right to change or
discontinue this product without notice.
12/97
© Motorola, Inc. 1997
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