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參數(shù)資料
| 型號(hào)： | MPC9140SD |
| 廠商： | MOTOROLA INC |
| 元件分類： | 時(shí)鐘及定時(shí) |
| 英文描述： | MPC900 SERIES, LOW SKEW CLOCK DRIVER, 18 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO48 |
| 封裝： | PLASTIC, SSOP-48 |
| 文件頁(yè)數(shù)： | 1/6頁(yè) |
| 文件大?。?/td> | 105K |
| 代理商： | MPC9140SD |
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
1
REV 1.0
Motorola, Inc. 1998
8/98
Product Preview
1:18 LVCMOS Fanout Buffer
The MPC9140 is a 1:18 LVCMOS fanout buffer targeted to support
Intel based Pentium II
microprocessor chip sets. The device features
18 low skew outputs optimized to drive the clock inputs of standard
unbuffered SDRAM modules. Standard unbuffered SDRAM modules
require four 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 MPC9140 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
18 Skew Controlled 3.3V Compatible SDRAM Clocks
I2C Serial Bus Interface
Extensive Output Enable Control Capability
Space Efficient 48–Lead SSOP Package
Operating Temperature Range of 0°C to 70°C
3.3V ± 5% Power Supply
48
1
NC
47
2
NC
46
3
VDD
45
4
SDRAM15
SDRAM0
44
5
SDRAM14
SDRAM1
43
6
VSS
42
7
VDD
41
8
SDRAM13
SDRAM2
40
9
SDRAM12
SDRAM3
39
10
VSS
38
11
OE
BUF_IN
37
12
VDD
36
13
SDRAM11
SDRAM4
35
14
SDRAM10
SDRAM5
34
15
VSS
33
16
VDD
32
17
SDRAM9
SDRAM6
31
18
SDRAM8
SDRAM7
30
19
VSS
29
20
VDD
28
21
SDRAM17
SDRAM16
27
22
VSS
26
23
VSS
VDD
25
24
SCLOCK
SDATA
Figure 1. 48–Lead Pinout (Top View)
This document contains information on a product under development. Motorola reserves the right to change or
discontinue this product without notice.
MPC9140
1:18 LVCMOS
FANOUT BUFFER
SD SUFFIX
48–LEAD PLASTIC SSOP PACKAGE
CASE 1215–01
FUNCTION TABLE
OE
V1, V2
0
1
High–Z
1x BUF_IN
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