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Integrated Circuit Systems, Inc.
ICS83948I-01
LOW SKEW, 1-TO-12 DIFFERENTIAL-TO-LVCMOS FANOUT BUFFER
FEATURES
* 12 LVCMOS outputs * Selectable LVCMOS clock or differential CLK, nCLK inputs * CLK, nCLK pair can accept the following differential input levels: LVDS, LVPECL, LVHSTL, SSTL, HCSL * LVCMOS_CLK accepts the following input levels: LVCMOS or LVTTL * Maximum output frequency: 150MHz * Output skew: 350ps (maximum) * Part to part skew: 1.5ns (maximum) * 3.3V core, 3.3V output * -40C to 85C ambient operating temperature * Pin compatible with the MPC948/948L
GENERAL DESCRIPTION
The ICS83948I-01 is a low skew, 1-to-12 Differential-to-LVCMOS Fanout Buffer and a member HiPerClockSTM of the HiPerClockSTM family of High Performance Clock Solutions from ICS. The ICS83948I-01 has two selectable clock inputs. The CLK, nCLK pair can accept most standard differential input levels. The LVCMOS_CLK can accept LVCMOS or LVTTL input levels. The low impedance LVCMOS outputs are designed to drive 50 series or parallel terminated transmission lines. The effective fanout can be increased from 12 to 24 by utilizing the ability of the outputs to drive two series terminated lines.
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The ICS83948I-01 is characterized at 3.3V core/3.3V output. Guaranteed output and part-to-part skew characteristics make the ICS83948I-01 ideal for those clock distribution applications demanding well defined performance and repeatability.
BLOCK DIAGRAM
CLK_EN D Q LVCMOS_CLK CLK nCLK 1 Q0 0 Q1 CLK_SEL Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Q11 OE
PIN ASSIGNMENT
GND GND VDDO VDDO Q0 Q1 Q2 Q3
32 31 30 29 28 27 26 25 CLK_SEL LVCMOS_CLK CLK nCLK CLK_EN OE VDD GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Q11 VDDO Q10 GND Q9 VDDO Q8 GND
24 23 22
GND Q4 VDDO Q5 GND Q6 VDDO Q7
ICS83948I-01
21 20 19 18 17
32-Lead LQFP 7mm x 7mm x 1.4mm package body Y Package Top View
83948AYI-01
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REV. A SEPTEMBER 23, 2002
Integrated Circuit Systems, Inc.
ICS83948I-01
LOW SKEW, 1-TO-12 DIFFERENTIAL-TO-LVCMOS FANOUT BUFFER
Name CLK_SEL Input Input Input Input Input Input Power Power Output Power Type Pullup Pullup Pullup Pullup Pullup Description Clock select input. Selects LVCMOS clock input when HIGH. Selects CLK, nCLK inputs when LOW. LVCMOS / LVTTL interface levels. Clock input. LVCMOS / LVTTL interface levels. Non-inver ting differential clock input. Clock enable. LVCMOS / LVTTL interface levels. Output enable. LVCMOS / LVTTL interface levels. Core supply pin. Power supply ground. Clock outputs. LVCMOS / LVTTL interface levels. Output supply pins.
TABLE 1. PIN DESCRIPTIONS
Number 1 2 3 4 5 6 7 8, 12, 16, 20, 24, 28, 32 9, 11, 13, 15, 17, 19, 21, 23 25, 27, 29, 31 10, 14, 18, 22, 26, 30
LVCMOS_CLK CLK nCLK CLK_EN OE VDD GND Q11, Q10, Q9, Q8, Q7, Q6, Q5, Q4, Q3, Q2, Q1, Q0 VDDO
Pulldown Inver ting differential clock input.
NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol CIN CPD RPULLUP RPULLDOWN ROUT Parameter Input Capacitance Power Dissipation Capacitance (per output) Input Pullup Resistor Input Pulldown Resistor Output Impedance Test Conditions Minimum Typical Maximum 4 25 51 51 7 Units pF pF K K
TABLE 3A. CLOCK SELECT FUNCTION TABLE
Control Input CLK_SEL 0 1 CLK, nCLK Selected De-selected Clock LVCMOS_CLK De-selected Selected
TABLE 3B. CLOCK INPUT FUNCTION TABLE
Inputs CLK_SEL 0 0 0 0 0 0 1 1 LVCMOS_CLK -- -- -- -- -- -- 0 1 CLK 0 1 0 1 Biased; NOTE 1 Biased; NOTE 1 -- -- nCLK 1 0 Biased; NOTE 1 Biased; NOTE 1 0 1 -- -- Outputs Q0:Q12 LOW HIGH LOW HIGH HIGH LOW LOW HIGH Input to Output Mode Differential to Single Ended Differential to Single Ended Single Ended to Single Ended Single Ended to Single Ended Single Ended to Single Ended Single Ended to Single Ended Single Ended to Single Ended Single Ended to Single Ended Polarity Non Inver ting Non Inver ting Non Inver ting Non Inver ting Inver ting Inver ting Non Inver ting Non Inver ting
NOTE 1: Please refer to the Application Information section, "Wiring the Differential Input to Accept Single Ended Levels".
83948AYI-01
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REV. A SEPTEMBER 23, 2002
Integrated Circuit Systems, Inc.
ICS83948I-01
LOW SKEW, 1-TO-12 DIFFERENTIAL-TO-LVCMOS FANOUT BUFFER
4.6V -0.5V to VDD + 0.5 V -0.5V to VDDO + 0.5V 47.9C/W (0 lfpm) -65C to 150C
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VDD Inputs, VI Outputs, VO Package Thermal Impedance, JA Storage Temperature, Tstg
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stress specifications only. Functional operation of product at these conditions or any conditions beyond those listed in the DC Characteristics or AC Characteristics is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability.
TABLE 4A. POWER SUPPLY CHARACTERISTICS, VDD = VDDO = 3.3V0.3V, TA = -40 TO 85
Symbol Parameter VDD VDDO IDD Input Supply Voltage Output Supply Voltage Quiescent Supply Current Test Conditions Minimum 3.0 3.0 Typical 3.3 3.3 Maximum 3.6 3.6 55 Units V V mA
TABLE 4B. DC CHARACTERISTICS, VDD = VDDO = 3.3V0.3V, TA = -40 TO 85
Symbol Parameter VIH VIL VPP VCMR IIN VOH Input High Voltage Input Low Voltage Peak-to-Peak Input Voltage Input Common Mode Voltage; NOTE 1, 2 Input Current Output High Voltage LVCMOS/LVTTL LVCMOS/LVTTL CLK, nCLK CLK, nCLK 0.15 GND + 0.5 Test Conditions Minimum 2 Typical Maximum 3.6 0.8 1.3 VDD - 0.85 100 IOH = -20mA 2.5 0.4 Units V V V V A V V
Output Low Voltage IOL = 20mA VOL NOTE 1: For single ended applications, the maximum input voltage for CLK, nCLK is VDD + 0.3V. NOTE 2: Common mode voltage is defined as VIH.
83948AYI-01
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REV. A SEPTEMBER 23, 2002
Integrated Circuit Systems, Inc.
ICS83948I-01
LOW SKEW, 1-TO-12 DIFFERENTIAL-TO-LVCMOS FANOUT BUFFER
Test Conditions Minimum 150 2.5 3 Measured on rising edge @VDDO/2 Measured on rising edge @VDDO/2 0.8V to 2V 0.8V to 2V 0.2 0.2 tPeriod/2 - 800 Typical Maximum Units MHz ns ns ps ns ns ns ns ps ns ns ns ns ns ns
TABLE 5. AC CHARACTERISTICS, VDD = VDDO = 3.3V0.3V, TA = -40 TO 85
Symbol Parameter fMAX Maximum Output Frequency CLK, nCLK; NOTE 1A Propagation Delay tPD LVCMOS_CLK; NOTE 1B
6.5 5.5 350 1.5 2 1.0 1.0 tPeriod/2 + 800 11
tsk(o) tsk(pp)
tR tF tPW tPZL, tPZH tPLZ, tPHZ
Output Skew; NOTE 2, 6 Par t-to-Par t Skew; NOTE 3, 6 Output Rise Time Output Fall Time Output Pulse Width Output Disable Time; NOTE 4 CLK, nCLK LVCMOS_CLK
Output Enable Time; NOTE 4 11 CLK_EN to 1 Clock Enable CLK Setup Time; tS CLK_EN to NOTE 5 0 LVCMOS_CLK CLK to 0 Clock Enable CLK_EN Hold Time; tH LVCMOS_CLK NOTE 5 1 to CLK_EN NOTE 1A: Measured from the differential input crossing point to VDDO/2 of the output. NOTE 1B: Measured from the VDD/2 of the input to VDDO/2 of the output. NOTE 2: Defined as skew between outputs at the same supply voltage and with equal load conditions. Measured at VDDO/2. NOTE 3: Defined as skew between outputs on different devices operating at the same supply voltages and with equal load conditions. Using the same type of inputs on each device, the outputs are measured at VDDO/2. NOTE 4: These parameters are guaranteed by characterization. Not tested in production. NOTE 5: Setup and Hold times are relative to the falling edge of the input clock. NOTE 6: This parameter is defined in accordance with JEDEC Standard 65.
83948AYI-01
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REV. A SEPTEMBER 23, 2002
Integrated Circuit Systems, Inc.
ICS83948I-01
LOW SKEW, 1-TO-12 DIFFERENTIAL-TO-LVCMOS FANOUT BUFFER
PARAMETER MEASUREMENT INFORMATION
1.65V0.15V
VDD, VDDO Qx
SCOPE
LVCMOS
GND
-1.65V0.15V
3.3V OUTPUT LOAD TEST CIRCUIT
VDD
nCLK V CLK
PP
Cross Points
V
CMR
GND
DIFFERENTIAL INPUT LEVEL
83948AYI-01
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REV. A SEPTEMBER 23, 2002
Integrated Circuit Systems, Inc.
ICS83948I-01
LOW SKEW, 1-TO-12 DIFFERENTIAL-TO-LVCMOS FANOUT BUFFER
VDDO 2
Qx
Qy
VDDO 2
tsk(o)
OUTPUT SKEW
PART 1 Qx
VDDO 2
PART 2 Qy
VDDO 2
tsk(pp)
PART-TO-PART SKEW
2V
2V
0.8V Clock Outputs t
R
0.8V t
AND
F
OUTPUT RISE
FALL TIME
83948AYI-01
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REV. A SEPTEMBER 23, 2002
Integrated Circuit Systems, Inc.
ICS83948I-01
LOW SKEW, 1-TO-12 DIFFERENTIAL-TO-LVCMOS FANOUT BUFFER
V
DD
LVCMOS_CLK
2
nCLK
CLK
V
Q0:Q11
DDO
2
t
V Q0:Q11
83948AYI-01
DDO
PD
PROPAGATION DELAY
V
DDO
V
DDO
2 t
PW
2
2
t t odc = t
PW
PERIOD
PERIOD
tPW & tPERIOD
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REV. A SEPTEMBER 23, 2002
Integrated Circuit Systems, Inc.
ICS83948I-01
LOW SKEW, 1-TO-12 DIFFERENTIAL-TO-LVCMOS FANOUT BUFFER APPLICATION INFORMATION
WIRING THE DIFFERENTIAL INPUT TO ACCEPT SINGLE ENDED LEVELS
Figure 2 shows how the differential input can be wired to accept single ended levels. The reference voltage V_REF = VDD/2 is generated by the bias resistors R1, R2 and C1. This bias circuit should be located as close as possible to the input pin. The ratio of R1 and R2 might need to be adjusted to position the V_REF in the center of the input voltage swing. For example, if the input clock swing is only 2.5V and VDD = 3.3V, V_REF should be 1.25V and R2/R1 = 0.609.
VDD
R1 1K CLK_IN + V_REF C1 0.1uF R2 1K
FIGURE 2 - SINGLE ENDED SIGNAL DRIVING DIFFERENTIAL INPUT
83948AYI-01
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REV. A SEPTEMBER 23, 2002
Integrated Circuit Systems, Inc.
ICS83948I-01
LOW SKEW, 1-TO-12 DIFFERENTIAL-TO-LVCMOS FANOUT BUFFER RELIABILITY INFORMATION
TABLE 6. JAVS. AIR FLOW TABLE
qJA by Velocity (Linear Feet per Minute)
0
Single-Layer PCB, JEDEC Standard Test Boards Multi-Layer PCB, JEDEC Standard Test Boards 67.8C/W 47.9C/W
200
55.9C/W 42.1C/W
500
50.1C/W 39.4C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
TRANSISTOR COUNT
The transistor count for ICS83948I-01 is: 1040
83948AYI-01
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REV. A SEPTEMBER 23, 2002
Integrated Circuit Systems, Inc.
ICS83948I-01
LOW SKEW, 1-TO-12 DIFFERENTIAL-TO-LVCMOS FANOUT BUFFER
PACKAGE OUTLINE - Y SUFFIX
TABLE 7. PACKAGE DIMENSIONS
JEDEC VARIATION ALL DIMENSIONS IN MILLIMETERS BBA SYMBOL N A A1 A2 b c D D1 D2 E E1 E2 e L q ccc 0.45 0 --0.05 1.35 0.30 0.09 MINIMUM NOMINAL 32 --1.40 0.37 -9.00 BASIC 7.00 BASIC 5.60 Ref. 9.00 BASIC 7.00 BASIC 5.60 Ref. 0.80 BASIC 0.60 --0.75 7 0.10 1.60 0.15 1.45 0.45 0.20 MAXIMUM
REFERENCE DOCUMENT: JEDEC PUBLICATION 95, MS-026
83948AYI-01
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REV. A SEPTEMBER 23, 2002
Integrated Circuit Systems, Inc.
ICS83948I-01
LOW SKEW, 1-TO-12 DIFFERENTIAL-TO-LVCMOS FANOUT BUFFER
Marking ICS83948AYI01 ICS83948AYI01 Package 32 Lead LQFP 32 Lead LQFP on Tape and Reel Count 250 per tray 1000 Temperature -40C to 85C -40C to 85C
TABLE 8. ORDERING INFORMATION
Part/Order Number ICS83948AYI-01 ICS83948AYI-01T
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Incorporated (ICS) assumes no responsibility for either its use or for 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 and industrial applications. Any other applications such as those requiring 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. 83948AYI-01
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REV. A SEPTEMBER 23, 2002

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