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参数资料
| 型号： | MC10H644 |
| 厂商： | ON SEMICONDUCTOR |
| 英文描述： | 68030/040 PECL-TTL CLOCK DRIVER |
| 中文描述： | 040分之68030PECL的- TTL时钟驱动 |
| 文件页数： | 1/5页 |
| 文件大小： | 85K |
| 代理商： | MC10H644 |
SEMICONDUCTOR TECHNICAL DATA
Motorola, Inc. 1995
2–1
11/93
REV 3
The MC10H/100H644 generates the necessary clocks for the 68030,
68040 and similar microprocessors. The device is functionally equivalent
to the H640, but with fewer outputs in a smaller outline 20–lead PLCC
package. It is guaranteed to meet the clock specifications required by the
68030 and 68040 in terms of part–to–part skew, within–part skew and
also duty cycle skew.
Generates Clocks for 68030/040
Meets 68030/040 Skew Requirements
TTL or PECL Input Clock
Extra TTL and ECL Power/Ground Pins
Within Device Skew on Similar Paths is 0.5 ns
Asynchronous Reset
Single +5.0V Supply
The user has a choice of using either TTL or PECL (ECL referenced to
+5.0V) for the input clock. TTL clocks are typically used in present MPU
systems. However, as clock speeds increase to 50MHz and beyond, the
inherent superiority of ECL (particularly differential ECL) as a means of
clock signal distribution becomes increasingly evident. The H644 also
uses differential ECL internally to achieve its superior skew characteristic.
The H644 includes divide–by–two and divide–by–four stages, both to
achieve the necessary duty cycle and skew to generate MPU clocks as required. A typical 50MHz processor application would
use an input clock running at 100MHz, thus obtaining output clocks at 50MHz and 25MHz (see Logic Symbol).
The 10H version is compatible with MECL 10H
ECL logic levels, while the 100H version is compatible with 100K levels
(referenced to +5.0V).
Function
Reset (R):LOW on RESET forces all Q outputs LOW and all Q outputs HIGH.
Synchronized Outputs: The device is designed to have the POS edges of the
÷
2 and
÷
4 outputs synchronized.
Select (SEL):LOW selects the ECL input source (DE/DE). HIGH selects the TTL input source (DT).
The H644 also contains circuitry to force a stable state of the ECL input differential pair, should both sides be left open. In this
case, the DE side of the input is pulled LOW, and DE goes HIGH.
GT
Q3
GT
Q2
GT
Q4
VT
Q5
GT
R
VE
DE
VBB
DE
GE
Q1
VT
Q0
SEL
DT
19
18
13
17
16
15
14
12
11
10
9
4
5
6
7
8
20
1
2
3
Pinout: 20–Lead PLCC
(Top View)
MECL 10H is a trademark of Motorola, Inc.
68030/040
PECL–TTL CLOCK
DRIVER
FN SUFFIX
PLASTIC PACKAGE
CASE 775–02
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC10H644FN | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Motorola Inc 功能描述: 制造商:ON Semiconductor 功能描述: |
| MC10H645FN | 功能描述:时钟驱动器及分配 1:9 TTL Clock Driver RoHS:否 制造商:Micrel 乘法/除法因子:1:4 输出类型:Differential 最大输出频率:4.2 GHz 电源电压-最大: 电源电压-最小:5 V 最大工作温度:+ 85 C 封装 / 箱体:SOIC-8 封装:Reel |
| MC10H645FNG | 功能描述:时钟驱动器及分配 1:9 TTL Clock Driver RoHS:否 制造商:Micrel 乘法/除法因子:1:4 输出类型:Differential 最大输出频率:4.2 GHz 电源电压-最大: 电源电压-最小:5 V 最大工作温度:+ 85 C 封装 / 箱体:SOIC-8 封装:Reel |
| MC10H645FNR2 | 功能描述:时钟驱动器及分配 1:9 TTL Clock Driver RoHS:否 制造商:Micrel 乘法/除法因子:1:4 输出类型:Differential 最大输出频率:4.2 GHz 电源电压-最大: 电源电压-最小:5 V 最大工作温度:+ 85 C 封装 / 箱体:SOIC-8 封装:Reel |
| MC10H645FNR2G | 功能描述:时钟驱动器及分配 1:9 TTL Clock Driver RoHS:否 制造商:Micrel 乘法/除法因子:1:4 输出类型:Differential 最大输出频率:4.2 GHz 电源电压-最大: 电源电压-最小:5 V 最大工作温度:+ 85 C 封装 / 箱体:SOIC-8 封装:Reel |
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