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PDF MC10H644 Data sheet ( Hoja de datos )
| Número de pieza | MC10H644 | |
| Descripción | 68030/040 PECL-TTL CLOCK DRIVER | |
| Fabricantes | Motorola Semiconductors | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MC10H644 (archivo pdf) en la parte inferior de esta página. Total 5 Páginas | ||
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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
68030/040
PECL-TTL Clock Driver
MC10H644
MC100H644
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.
68030/040
PECL–TTL CLOCK
DRIVER
• 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.
FN SUFFIX
PLASTIC PACKAGE
CASE 775–02
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.
MECL 10H is a trademark of Motorola, Inc.
Pinout: 20–Lead PLCC (Top View)
Q4 VT Q5 GT R
18 17 16 15 14
GT 19
13
Q3 20
12
GT 1
11
Q2 2
10
GT 3
9
4 5 6 78
VE
DE
VBB
DE
GE
Q1 VT Q0 SEL DT
11/93
© Motorola, Inc. 1995
2–1
REV 3
1 page  
MC10H644 MC100H644
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”
must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of
others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other
applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury
or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola
and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that
Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal
Opportunity/Affirmative Action Employer.
How to reach us:
USA/EUROPE/Locations Not Listed: Motorola Literature Distribution;
P.O. Box 20912; Phoenix, Arizona 85036. 1–800–441–2447 or 602–303–5454
MFAX: [email protected] – TOUCHTONE 602–244–6609
INTERNET: http://Design–NET.com
JAPAN: Nippon Motorola Ltd.; Tatsumi–SPD–JLDC, 6F Seibu–Butsuryu–Center,
3–14–2 Tatsumi Koto–Ku, Tokyo 135, Japan. 03–81–3521–8315
ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park,
51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298
MECL Data
DL122 — Rev 6
◊
*MC10H644/D*MC10H644/D
2–5 MOTOROLA
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