ICS651中文资料

ICS651 L OW S KEW 1 TO 4 C LOCK B UFFER

Description

The ICS651 is a low skew, single input to four output, clock buffer. Part of ICS’ ClockBlocks TM family, this is a low skew, small clock buffer.

ICS makes many non-PLL and PLL based low skew output devices as well as Zero Delay Buffers to synchronize clocks. Contact us for all of your clocking needs.Features

?Low skew outputs (250 ps)?Packaged in 8-pin SOIC ?Available in Pb (lead) free package ?Low power CMOS technology ?Operating Voltages of 1.8 V to 2.5 V ?Output Enable pin tri-states outputs ? 3.3 V tolerant input clock ?Industrial temperature range

Block Diagram

L OW S KEW 1 TO 4 C LOCK B UFFER

Pin Assignment

Pin Descriptions

External Components

A minimum number of external components are required for proper operation. A decoupling capacitor of 0.01 μF should be connected between VDD on pin 7 and GND on pin 6, as close to the device as possible. A 33 ? series terminating resistor may be used on each clock output if the trace is longer than 1 inch.To achieve the low output skew that the ICS651 is capable of, careful attention must be paid to board layout. Essentially, all four outputs must have identical terminations, identical loads and identical trace geometries. If they do not, the output skew will be degraded. For example, using a 30? series termination on one output (with 33? on the others) will cause at least 15 ps of skew.

Pin Number Pin Name

Pin Type

Pin Description

1ICLK Input Clock Input. 3.3 V tolerant input.

2Q1Output Clock Output 1.3Q2Output Clock Output 2.4Q3Output Clock Output 3.5Q4Output Clock Output 4.6GND Power Connect to ground.

7VDD Power Connect to +1.8 V or +2.5 V.

8

OE

Input

Output Enable. Tri-states outputs when low. Connect to VDD for normal operation.

L OW S KEW 1 TO 4 C LOCK B UFFER

Absolute Maximum Ratings

Stresses above the ratings listed below can cause permanent damage to the ICS651. These ratings, which are standard values for ICS commercially rated parts, are stress ratings only. Functional operation of the device at these or any other conditions above those indicated in the operational sections of the

specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical parameters are guaranteed only over the recommended operating temperature range.

Recommended Operation Conditions

Item

Rating

Supply Voltage, VDD

7 V

Output Enable and All Outputs -0.5 V to VDD+0.5 V ICLK

-0.5 V to 3.6 V (VDD > 0V)Ambient Operating Temperature -40 to +85 °C Storage Temperature -65 to +150°C Junction Temperature 125°C Soldering Temperature

260°C

Parameter

Min.

Typ.Max.

Units

Ambient Operating Temperature

-40+85°C

Power Supply Voltage (measured in respect to GND)

+1.6

+3.6

V

L OW S KEW 1 TO 4 C LOCK B UFFER

DC Electrical Characteristics

VDD=1.8 V ±5%, Ambient temperature -40 to +85°C, unless stated otherwise

Notes: 1. Nominal switching threshold is VDD/2

VDD=2.5 V ±5%, Ambient temperature -40 to +85°C, unless stated otherwise

Notes: 1. Nominal switching threshold is VDD/2

Parameter

Symbol

Conditions

Min.

Typ.Max.

Units

Operating Voltage VDD 1.71 1.89V Input High Voltage V IH Note 1, ICLK, OE 1.17 3.6V Input Low Voltage V IL Note 1, ICLK, OE 0.63V Output High Voltage V OH I OH = -6 mA 1.35

V Output Low Voltage V OL I OL = 6 mA 0.45

V Operating Supply Current IDD No load, 133 MHz 25mA Nominal Output Impedance Z O 20?

Input Capacitance C IN ICLK, OE pin

5pF Short Circuit Current

I OS

±28

mA

Parameter

Symbol

Conditions

Min.

Typ.Max.

Units

Operating Voltage VDD 2.375 2.625V Input High Voltage, ICLK V IH Note 1, ICLK, OE 1.7 3.6V Input Low Voltage, ICLK V IL Note 1, ICLK, OE 0.7V Output High Voltage V OH I OH = -8 mA 2

V Output Low Voltage V OL I OL = 8mA 0.4

V Operating Supply Current IDD No load, 133 MHz 50mA Nominal Output Impedance Z O 20?

Input Capacitance C IN ICLK, OE pin

5pF Short Circuit Current

I OS

±50

mA

L OW S KEW 1 TO 4 C LOCK B UFFER

AC Electrical Characteristics

VDD = 1.8 V ±5%, Ambient Temperature -40 to +85°C, unless stated otherwise

VDD = 2.5 V ±5%, Ambient Temperature -40 to +85°C, unless stated otherwise

Notes: 1. With rail to rail input clock

2. Between any 2 outputs with equal loading.

Thermal Characteristics

Parameter

Symbol

Conditions

Min.

Typ.

Max.Units

Input Frequency 0

166MHz Output Rise Time t OR 0.63 V to 1.17 V 1.0 1.5ns Output Fall Time t OF 1.17 V to 0.63 V

1.0

1.5ns Propagation Delay Note 1

2.2

35ns Output to Output Skew

Note 2

Rising edges at VDD/2

±250

ps

Parameter

Symbol

Conditions

Min.

Typ.

Max.Units

Input Frequency 0

200MHz Output Rise Time t OR 0.7 V to 1.7 V 1.0 1.5ns Output Fall Time t OF 1.7 V to 0.7 V

1.0

1.5ns Propagation Delay Note 1

2.2

35ns Output to Output Skew

Note 2

Rising edges at VDD/2

±250

ps

Parameter

Symbol

Conditions

Min.Typ.

Max.Units

Thermal Resistance Junction to Ambient

θJA Still air 150°C/W θJA 1 m/s air flow 140°C/W θJA 3 m/s air flow

120°C/W Thermal Resistance Junction to Case

θJC

40

°C/W

L OW S KEW 1 TO 4 C LOCK B UFFER

Package Outline and Package Dimensions (8-pin SOIC, 150 Mil. Narrow Body)

Package dimensions are kept current with JEDEC Publication No. 95

Ordering Information

Parts that are ordered with a “LF” suffix to the part number are the Pb-Free configuration and are RoHS compliant.While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (ICS) result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not recommended without additional processing by ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any ICS product for use in life support devices or critical medical instruments.

Part / Order Number

Marking

Shipping Packaging

Package

Temperature

ICS651MI ICS651MI Tubes 8-pin SOIC -40 to +85°C ICS651MIT ICS651MI Tape and Reel

8-pin SOIC -40 to +85°C ICS651MILF 651MILF Tubes 8-pin SOIC -40 to +85°C ICS651MILFT

651MILF

Tape and Reel

8-pin SOIC

-40 to +85°C

Revision History

Rev.Originator Date Description of Change

A K. Beckmeyer6/27/05Preliminary Datasheet

B K. Beckmeyer8/31/05Output high and low voltage current conditions changed to 6mA and 6mA respectively at

1.8V, and -8mA and 8mA respectively at

2.5V operation. Short circuit current spec

changed to ±50mA typical at 2.5V operation. Output-to-output skew max spec changed to

±250ps at both 1.8V and 2.5V operation.

C K. Beckmeyer12/08/05Added LF ordering info.