MPC940L Motorola, MPC940L Datasheet

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MPC940L

Manufacturer Part Number
MPC940L
Description
Low Voltage 1:18 Clock Distribution Chlp
Manufacturer
Motorola
Datasheet

Specifications of MPC940L

Case
TQFP
Dc
01+

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Advance Information
Low Voltage 1:18 Clock
Distribution Chip
LVCMOS output capabilities. The device features the capability to select
either a differential LVPECL or an LVTTL/ LVCMOS compatible input. The
18 outputs are 2.5V LVCMOS compatible and feature the drive strength
to drive 50
output–to–output skews of 150ps, the MPC940L is ideal as a clock
distribution chip for the most demanding of synchronous systems. The
2.5V outputs also make the device ideal for supplying clocks for a high
performance Pentium II
states, the output buffers of the MPC940L are ideal for driving series
terminated transmission lines. With this drive capability, the MPC940L
provides enough copies of low skew clocks for most high performance
synchronous systems.
MC100EP111 to build very wide clock fanout trees or to couple to a high frequency clock source. The LVCMOS/LVTTL input
provides a more standard interface for applications requiring only a single clock distribution chip at relatively low frequencies. In
addition, the two clock sources can be used to provide for a test clock interface as well as the primary system clock. A logic HIGH
on the LVCMOS_CLK_Sel pin will select the TTL level clock input.
requiring 2.5V. The 32–lead TQFP package was chosen to optimize performance, board space and cost of the device. The
32–lead TQFP has a 7x7mm body size with a conservative 0.8mm pin spacing.
Pentium II is a trademark of Intel Corporation.
This document contains information on a new product. Specifications and information herein are subject to
change without notice.
10/97
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Motorola, Inc. 1997
LVPECL or LVCMOS/LVTTL Clock Input
2.5V LVCMOS Outputs for Pentium II Microprocessor Support
150ps Maximum Targeted Output–to–Output Skew
Maximum Output Frequency of 250MHz
32–Lead TQFP Packaging
Dual V CC Supply Voltage, 3.3V Core and 2.5V Output
The MPC940L is a 1:18 low voltage clock distribution chip with 2.5V
With a low output impedance ( 30 ), in both the HIGH and LOW logic
The differential LVPECL inputs of the MPC940L allow the device to interface directly with a LVPECL fanout buffer like the
The MPC940L is a dual supply device. The core V CC power pins (VCCI) require 3.3V with the output V CC pins (VCCO)
series or parallel terminated transmission lines. With
microprocessor based design.
1
REV 0
DISTRIBUTION CHIP
32–LEAD TQFP PACKAGE
MPC940L
LOW VOLTAGE
1:18 CLOCK
CASE 873A–02
FA SUFFIX

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MPC940L Summary of contents

Page 1

... LVCMOS_CLK_Sel pin will select the TTL level clock input. The MPC940L is a dual supply device. The core V CC power pins (VCCI) require 3.3V with the output V CC pins (VCCO) requiring 2.5V. The 32–lead TQFP package was chosen to optimize performance, board space and cost of the device. The 32– ...

Page 2

... Pinout: 32–Lead TQFP (Top View GNDO VCCO MOTOROLA LOGIC DIAGRAM VCCO 15 Q12 14 Q13 13 Q14 MPC940L 12 GNDO 11 Q15 10 Q16 9 Q17 Q1–Q16 Q17 FUNCTION TABLE LVCMOS_CLK_Sel Input 0 PECL_CLK 1 LVCMOS_CLK POWER SUPPLY VOLTAGES Supply Pin Voltage Level VCCI 3.3V 5% 2.5V 5% VCCO TIMING SOLUTIONS BR1333 — Rev 6 ...

Page 3

... Input Current C IN Input Capacitance C pd Power Dissipation Capacitance I CC Maximum Quiescent Supply Current 1. The MPC940L outputs can drive series or parallel terminated 50 ( /2) transmission lines on the incident edge. AC CHARACTERISTICS ( CCI = 3.3V 5%; V CCO = 2.5V 5%) Symbol F max Maximum Input Frequency t pd Propagation Delay t sk(o) Output– ...

Page 4

... MPC940L 32 1 –T– B www.DataSheet4U.com –AB– SEATING –AC– PLANE DETAIL AD MOTOROLA OUTLINE DIMENSIONS FA SUFFIX TQFP PACKAGE CASE 873A–02 ISSUE 0.20 (0.008) AB T– –U– V DETAIL –Z– 0.20 (0.008) AC T–U S DETAIL AD G 0.10 (0.004) AC BASE METAL N É ...

Page 5

... Nishi–Gotanda, Shinagawa–ku, Tokyo 141, Japan. 81–3–5487–8488 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, – US & Canada ONLY 1–800–774–1848 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298 5 MPC940L Mfax is a trademark of Motorola, Inc. MPC940L/D MOTOROLA ...

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