MK2308S-1IT - Integrated Circuit Systems, Inc.

MK2308-1

MDS 2308-1 A 1Revision 100603

Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 295-9800 ● www.icst.com

3.3 VOLT ZERO DELAY, LOW SKEW BUFFER

Description

The MK2308-1 is a low phase noise, high-speed PLL

based, 8-output, low-skew zero delay buffer. Based on

ICS’ proprietary low jitter Phase Locked Loop (PLL)

techniques, the device provides eight low skew outputs

at speeds up to 133 MHz at 3.3 V. The outputs can be

generated from the PLL (for zero delay), or directly

from the input (for testing), and can be set to tri-state

mode or to stop at a low level. For normal operation as

a zero delay buffer, any output clock is tied to the FBIN

pin.

ICS manufactures a variety of clock generators and

buffers.

Features

•Clock outputs from 10 to 133 MHz

•Zero input-output delay

•Eight low skew (<200 ps) outputs

•Device-to-device skew <700 ps

•Full CMOS outputs with 25 mA output drive

capability at TTL levels

•5 V tolerant FBIN and CLKIN pins

•Tri-state mode for board-level testing

•Advanced, low power, sub-micron CMOS process

•Operating voltage of 3.3 V

•Industrial temperature range available

•Packaged in 16-pin SOIC

Block Diagram

CLKA4

CLKB1

CLKA3

CLKB2

CLKB3

CLKA2

CLKA1

CLKB4

CLKIN

Control

Logic

S2, S1 2

Clock

Synthesis

PLL

FBIN

Feedback is shown from CLKB4 for

illustration, but may come from any output.

VDD

GND 2

3.3 VOLT ZERO DELAY, LOW SKEW BUFFER

MDS 2308-1 A 2Revision 100603

Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 295-9800 ● www.icst.com

MK2308-1

Pin Assignment

Output Clock Mode Select Table

Note 1. Outputs are in high impedance state

Note 2. Buffer mode only; not zero delay between input and output

Pin Descriptions

CLKIN FBIN

CLKA1

CLKA2

CLKA4

VDD

CLKA3

GND

CLKB1

VDD

GND

CLKB4

CLKB2 CLKB3

S2 S1

16 pin narrow (150 m il) SOIC

S2 S1 CLKA1:A4 CLKB1:B4 A & B Source PLL Status

0 0 Tri-state (note 1) Tri-state (note 1) PLL OFF

0 1 Running Tri-state (note 1) PLL ON

1 0 Running Running CLKIN (note 2) OFF

1 1 Running Running PLL ON

Number

Name

Pin Type Pin Description

1 CLKIN Input Clock input (5 V tolerant).

2 - 3 CLKA1:A4 Output Clock outputs A1:A4. See table above.

4 VDD Power Power supply. Connect to 3.3 V.

5 GND Power Connect to ground.

6 - 7 CLKB1:B4 Output Clock outputs B1:B4. See table above.

8 S2 Input Select input 2. See table above. Internal pull-up.

9 S1 Input Select input 1. See table above. Internal pull-up.

10 - 11 CLKB1:B4 Output Clock outputs B1:B4. See table above.

12 GND Power Connect to ground.

13 VDD Power Power supply. Connect to 3.3 V.

14 - 15 CLKA1:A4 Output Clock outputs A1:A4. See table above.

16 FBIN Input Feedback input. Connect to any output under normal operation (5 V tolerant).

3.3 VOLT ZERO DELAY, LOW SKEW BUFFER

MDS 2308-1 A 3Revision 100603

Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 295-9800 ● www.icst.com

MK2308-1

External Components

The MK2308-1 requires a minimum number of external components for proper operation. Decoupling

capacitors of 0.01 mF should be connected between VDD and GND on pins 4 and 5, and VDD and GND

on pins 13 and 12, as close to the device as possible. A series termination resistor of 33Ω may be used to

each clock output pin to reduce reflections.

Absolute Maximum Ratings

Stresses above the ratings listed below can cause permanent damage to the MK2308-1. 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

All Inputs and Outputs -0.5 V to VDD+0.5 V

CLKIN and FBIN inputs -0.5 V to 5.5 V

Electrostatic Discharge 2000 V

Ambient Operating Temperature 0 to +70°C

Industrial Temperature -40 to +85°C

Commercial temperature 0 to 70°C

Storage Temperature -65 to +150°C

Junction Temperature 150°C

Soldering Temperature 260°C

Parameter Min. Typ. Max. Units

Ambient Operating Temperature (Industrial) -40 +85 °C

Ambient Operating Temperature (Commercial) 0 +70 °C

Power Supply Voltage (measured in respect to GND) +3.0 +3.6 V

3.3 VOLT ZERO DELAY, LOW SKEW BUFFER

MDS 2308-1 A 4Revision 100603

Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 295-9800 ● www.icst.com

MK2308-1

DC Electrical Characteristics

VDD=3.3 V ±10%, Ambient temperature -40 to +85°C(Industrial), (0-70°C Commercial),

AC Electrical Characteristics

VDD = 3.3 V ±10%, Ambient Temperature -40 to +85°C(Industrial), (0-70°C Commercial)

Parameter Symbol Conditions Min. Typ. Max. Units

Operating Voltage VDD 3.0 3.6 V

Input High Voltage VIH 2V

Input Low Voltage VIL 0.8 V

Input Low Current IIL VIN = 0V 50 µA

Input High Current IIH VIN = VDD 100 µA

Output High Voltage VOH IOH = -12 mA 2.4 V

Output Low Voltage VOL IOL = 12 mA 0.4 V

Output High Voltage,

CMOS level

VOH IOH = -4 mA VDD-0.4 V

Operating Supply Current IDD No Load, S2 = 1, S1 = 1,

Note 1

70 mA

Power Down Supply

Current

IDDPD CLKIN = 0, S2 = 0, S1 = 1 12 µA

CLKIN = 0, Note 2 12 µA

Short Circuit Current IOS Each output ±50 mA

Input Capacitance CIN S2, S1, FBIN 5 pF

Parameter Symbol Conditions Min. Typ. Max. Units

Input Clock Frequency fIN See table on page 2 10 133 MHz

Output Clock Frequency See table on page 2 10 133 MHz

Output Rise Time tOR 0.8 to 2.0 V, CL=30 pF 1.5 ns

Output Fall Time tOF 2.0 to 0.8 V, CL=30 pF 1.25 ns

Output Clock Duty Cycle tDC measured at VDD/2 45 50 55 %

Device to Device Skew rising edges at VDD/2 700 ps

Output to Output Skew rising edges at VDD/2 200 ps

Input to Output Skew rising edges at VDD/2, FBIN to

CLKA4, S1 = 1, S0 = 1, Note 1

±250 ps

Maximum Absolute Jitter CL=15 pF, measured at 66.67M 130 ps

3.3 VOLT ZERO DELAY, LOW SKEW BUFFER

MDS 2308-1 A 5Revision 100603

Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 295-9800 ● www.icst.com

MK2308-1

Note 1: With CLKIN = 100MHz, FBIN to CLKA4, all outputs at 100 MHz

Note 2: When there is no clock signal present at CLKIN, the MK2308-1 will enter power down mode. The

PLL is stopped and the outputs are tri-state.

Note 3: With VDD at a steady rate and valid clocks at CLKIN and FBIN

Thermal Characteristics

Cycle to Cycle Jitter CL=30 pF, measured at 66.67M 200 ps

CL=15 pF, measured at 66.67M 200 ps

CL=15 pF, measured at

133.33M

100 ps

PLL Lock Time Note 3 1.0 ms

Parameter Symbol Conditions Min. Typ. Max. Units

Thermal Resistance Junction to

Ambient θJA Still air 120 °C/W

θJA 1 m/s air flow 115 °C/W

θJA 3 m/s air flow 105 °C/W

Thermal Resistance Junction to Case θJC 58 °C/W

Parameter Symbol Conditions Min. Typ. Max. Units

MK2308-1

MDS 2308-1 A 6Revision 100603

Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 295-9800 ● www.icst.com

3.3 VOLT ZERO DELAY, LOW SKEW BUFFER

Package Outline and Package Dimensions (16-pin SOIC, 150 Mil. Narrow Body)

Package dimensions are kept current with JEDEC Publication No. 95

Ordering Information

While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (ICS) assumes no

responsibility for either its use or for the infringement of any patents or other rights of third parties, which would 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

MK2308S-1I MK2308S-1I Tubes 16-pin SOIC -40 to +85° C

MK2308S-1IT MK2308S-1I Tape and Reel 16-pin SOIC -40 to +85° C

MK2308S-1 MK2308S-1 Tubes 16-pin SOIC 0 to +70° C

MK2308S-1T MK2308S-1 Tape and Reel 16-pin SOIC 0 to +70° C

INDEX

AREA

1 2

SEATING

PLANE

- C -

.10 (.004) C

h x 45

Millimeters Inches

Symbol Min Max Min Max

A 1.35 1.75 .0532 .0688

A1 0.10 0.25 .0040 .0098

B 0.330.51.013.020

C 0.19 0.25 .0075 .0098

D 9.80 10.00 .3859 .3937

E 3.80 4.00 .1497 .1574

e 1.27 BASIC 0.050 BASIC

H 5.80 6.20 .2284 .2440

h 0.250.50.010.020

L 0.401.27.016.050

α0°8°0°8°