Low Skew, 1-to-16

LVCMOS/LVTTL Clock Generator

87016

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20tegrated Device Technology, Inc.

GENERAL DESCRIPTION

The 87016 is a low skew, 1:16 LVCMOS/LVTTL Clock Generator.

The device has 4 banks of 4 outputs and each bank can be

independently selected for

÷1 or ÷2 frequency operation. Each

bank also has its own power supply pins so that the banks can

operate at the following different voltage levels: 3.3V, 2.5V, and

1.8V.The low impedance LVCMOS/LVTTL outputs are designed

to drive 50

Ω series or parallel terminated transmission lines.

The divide select inputs, DIV_SELA:DIV_SELD, control the

output frequency of each bank. The output banks can be

independently selected for

÷1 or ÷2 operation.The bank enable

inputs, CLK_ENA:CLK_END, support enabling and disabling

each bank of outputs individually. The CLK_ENA:CLK_END

circuitry has a synchronizer to prevent runt pulses when

enabling or disabling the clock outputs. The master reset

input, nMR/OE, resets the

÷1/÷2 flip flops and also controls the

active and high impedance states of all outputs. This pin has

an internal pull-up resistor and is normally used only for test

purposes or in systems which use low power modes.

The 87016 is characterized to operate with the core at

3.3V and the banks at 3.3V, 2.5V, or 1.8V. Guaranteed

bank, output, and part-to-part skew characteristics make

the 87016 ideal for those clock applications demanding

well-defined performance and repeatability.

FEATURES

• Sixteen LVCMOS/LVTTL outputs (4 banks of 4 outputs)

• Selectable differential CLK1, nCLK1 or

LVCMOS clock input

• CLK1, nCLK1 pair can accept the following differential input

levels: LVPECL, LVDS, LVHSTL, SSTL, HCSL

• CLK0 supports the following input types:

LVCMOS, LVTTL

• Maximum output frequency: 250MHz

• Independent bank control for

÷1 or ÷2 operation

• Independent output bank voltage settings for 3.3V, 2.5V,

or 1.8V operation

• Asynchronous clock enable/disable

• Output skew: 170ps (maximum)

• Bank skew: 30ps (maximum)

• Part-to-part skew: 750ps (maximum)

• 3.3V core, 3.3V, 2.5V, or 1.8V output operating supply

• 0°C to 85°C ambient operating temperature

• Available in lead-free RoHS compliant package

BLOCK DIAGRAM

PIN ASSIGNMENT

48-Pin LQFP

7mm x 7mm x 1.4mm body package

Y Package

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