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Integrated Circuit Systems, Inc.
ICS8531-01
LOW SKEW, 1-TO-9 DIFFERENTIAL-TO-3.3V LVPECL FANOUT BUFFER
FEATURES
* 9 differential 3.3V LVPECL outputs * Selectable CLK, nCLK or LVPECL clock inputs * CLK, nCLK pair can accept the following differential input levels: LVDS, LVPECL, LVHSTL, SSTL, HCSL * PCLK, nPCLK supports the following input types: LVPECL, CML, SSTL * Maximum output frequency up to 500MHz * Translates any single ended input signal (LVCMOS, LVTTL, GTL) to 3.3V LVPECL levels with resistor bias on nCLK input * Output skew: 50ps (maximum) * Part-to-part skew: 250ps (maximum) * Propagation delay: 2ns (maximum) * 3.3V operating supply * 0C to 70C ambient operating temperature * Industrial temperature information available upon request
GENERAL DESCRIPTION
The ICS8531-01 is a low skew, high performance 1-to-9 Differential-to-3.3V LVPECL Fanout Buffer HiPerClockSTM and a member of the HiPerClockSTM family of High Performance Clock Solutions from ICS. The ICS8531-01 has two selectable clock inputs. The CLK, nCLK pair can accept most standard differential input levels. The PCLK, nPCLK pair can accept LVPECL, CML, or SSTL input levels. The clock enable is internally synchronized to eliminate runt pulses on the outputs during asynchronous assertion/deassertion of the clock enable pin.
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Guaranteed output skew and part-to-part skew characteristics make the ICS8531-01 ideal for high performance workstation and server applications.
BLOCK DIAGRAM
CLK_EN CLK nCLK PCLK nPCLK CLK_SEL D Q LE 0 1 Q0 nQ0 Q1 nQ1 Q2 nQ2 Q3 nQ3 Q4 nQ4 Q5 nQ5 Q6 nQ6 Q7 nQ7 Q8 nQ8
PIN ASSIGNMENT
VCCO VCCO nQ0 nQ1 nQ2 Q0 Q1 Q2
32 31 30 29 28 27 26 25 VCC CLK nCLK CLK_SEL PCLK nPCLK VEE CLK_EN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Vcco nQ8 Q8 nQ7 Q7 nQ6 Q6 Vcco
24 23 22 21 20 19 18 17
VCCO Q3 nQ3 Q4 nQ4 Q5 nQ5 VCCO
ICS8531-01
32-Lead LQFP 7mm x 7mm x 1.4mm package body Y package Top View
8531AY-01
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1
REV. B AUGUST 9, 2001
Integrated Circuit Systems, Inc.
ICS8531-01
LOW SKEW, 1-TO-9 DIFFERENTIAL-TO-3.3V LVPECL FANOUT BUFFER
Type Power Input Input Input Input Input Power Input Power Output Output Output Output Output Output Output Output Output Pullup Pulldown Pullup Pulldown Pulldown Pullup Description Positive supply pin. Connect to 3.3V. Non-inver ting differential clock input. Inver ting differential clock input. Clock Select input. When HIGH, selects PCLK, nPCLK inputs. When LOW, selects CLK, nCLK. LVTTL / LVCMOS interface levels. Non-inver ting differential LVPECL clock input. Inver ting differential LVPECL clock input. Negative supply pin. Connect to ground. Synchronizing clock enable. When HIGH, clock outputs follow clock input. When LOW, Q outputs are forced low, nQ outputs are forced high. LVTTL / LVCMOS interface levels. Output supply pins. Connect to 3.3V. Differential output pair. LVPECL interface level. Differential output pair. LVPECL interface level. Differential output pair. LVPECL interface level. Differential output pair. LVPECL interface level. Differential output pair. LVPECL interface level. Differential output pair. LVPECL interface level. Differential output pair. LVPECL interface level. Differential output pair. LVPECL interface level. Differential output pair. LVPECL interface level.
TABLE 1. PIN DESCRIPTIONS
Number 1 2 3 4 5 6 7 8 9, 16, 17, 24, 25, 32 10, 11 12, 13 14, 15 18, 19 20, 21 22, 23 26, 27 28, 29 30, 31 Name VCC CLK nCLK CLK_SEL PCLK nPCLK VEE CLK_EN VCCO nQ8, Q8 nQ7, Q7 nQ6, Q6 nQ5, Q5 nQ4, Q4 nQ3 Q3 nQ2, Q2 nQ1, Q1 nQ0, Q0
NOTE: Pullup and Pulldown refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol CIN RPULLUP RPULLDOWN Parameter Input Capacitance CLK, nCLK, PCLK, nPLCK CLK_EN, CLK_SEL 51 51 Test Conditions Minimum Typical Maximum 4 4 Units pF pF K K
Input Pullup Resistor Input Pulldown Resistor
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REV. B AUGUST 9, 2001
Integrated Circuit Systems, Inc.
ICS8531-01
LOW SKEW, 1-TO-9 DIFFERENTIAL-TO-3.3V LVPECL FANOUT BUFFER
Inputs Outputs Selected Sourced CLK, nCLK PCLK, nPCLK CLK, nCLK Q0 thru Q8 Disabled; LOW Disabled; LOW Enabled nQ0 thru nQ8 Disabled; HIGH Disabled; HIGH Enabled
TABLE 3A. CONTROL INPUT FUNCTION TABLE
CLK_EN 0 0 1 CLK_SEL 0 1 0
1 1 PCLK, nPCLK Enabled Enabled After CLK_EN switches, the clock outputs are disabled or enabled following a rising and falling input clock edge as shown in Figure 1. In the active mode, the state of the outputs are a function of the CLK, nCLK and PCLK, nPCLK inputs as described in Table 3B.
nCLK, nPCLK CLK, PCLK
Disabled
Enabled
CLK_EN
nQ0 - nQ8 Q0 - Q8
FIGURE 1: CLK_EN TIMING DIAGRAM
TABLE 3B. CLOCK INPUTS FUNCTION TABLE
Inputs CLK or PCLK 0 1 0 1 Biased; NOTE 1 nCLK or nPCLK 1 0 Biased; NOTE 1 Biased; NOTE 1 0 LOW HIGH LOW HIGH HIGH Outputs Q0 thru Q8 nQ0 thru nQ8 HIGH LOW HIGH LOW LOW Input to Output Mode Differential to Differential Differential to Differential Single Ended to Differential Single Ended to Differential Single Ended to Differential Polarity Non Inver ting Non Inver ting Non Inver ting Non Inver ting Inver ting
Biased; NOTE 1 1 LOW HIGH Single Ended to Differential Inver ting NOTE 1: Please refer to the Application Information section on page 8, Figure 9, which discusses wiring the differential input to accept single ended levels.
8531AY-01
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REV. B AUGUST 9, 2001
Integrated Circuit Systems, Inc.
ICS8531-01
LOW SKEW, 1-TO-9 DIFFERENTIAL-TO-3.3V LVPECL FANOUT BUFFER
4.6V -0.5V to VCC + 0.5V -0.5V to VCCO + 0.5V 47.9C/W -65C to 150C
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCCx 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 DC CHARACTERISTICS, VCC = VCCO = 3.3V5%, TA = 0C TO 70C
Symbol VCC VCCO IEE Parameter Positive Supply Voltage Output Supply Voltage Power Supply Current Test Conditions Minimum 3.135 3.135 Typical 3.3 3.3 50 Maximum 3.465 3.465 70 Units V V mA
TABLE 4B. LVCMOS DC CHARACTERISTICS, VCC = VCCO = 3.3V5%, TA = 0C TO 70C
Symbol VIH VIL IIH IIL Parameter CLK_EN, CLK_SEL CLK_EN, CLK_SEL Input High Current Input Low Current CLK_EN CLK_SEL CLK_EN CLK_SEL VCC = VIN = 3.465V VCC = VIN = 3.465V VIN = 0V, VCC = 3.465V VIN = 0V, VCC = 3.465V -150 -5 Test Conditions Minimum 2 -0.3 Typical Maximum 3.765 0.8 5 150 Units V V A A A A
TABLE 4C. DIFFERENTIAL DC CHARACTERISTICS, VCC = VCCO = 3.3V5%, TA = 0C TO 70C
Symbol IIH IIL VPP Parameter Input High Current Input Low Current CLK nCLK CLK nCLK Test Conditions VCC = VIN = 3.465V VCC = VIN = 3.465V VIN = 0V, VCC = 3.465V VIN = 0V, VCC = 3.465V -5 -150 1.3 VCC - 0.85 Minimum Typical Maximum 150 5 Units A A A A V V
Peak-to-Peak Input Voltage 0.15 Common Mode Input Voltage; VCMR VEE + 0.5 NOTE 1, 2 NOTE 1: For single ended applications, the maximum input voltage for CLK and nCLK is VCC + 0.3V. NOTE 2: Common mode input voltage is defined as VIH.
8531AY-01
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REV. B AUGUST 9, 2001
Integrated Circuit Systems, Inc.
ICS8531-01
LOW SKEW, 1-TO-9 DIFFERENTIAL-TO-3.3V LVPECL FANOUT BUFFER
Test Conditions PCLK nPCLK PCLK nPCLK VCC = VIN = 3.465V VCC = VIN = 3.465V VIN = 0V, VCC = 3.465V VIN = 0V, VCC = 3.465V -5 -150 0.3 VEE + 1.5 VCCO - 1.4 VCCO - 2.0 1 VCC VCCO - 1.0 VCCO - 1.7 0.85 Minimum Typical Maximum 150 5 Units A A A A V V V V V
TABLE 4D. LVPECL DC CHARACTERISTICS, VCC = VCCO = 3.3V5%, TA = 0C TO 70C
Symbol IIH IIL V PP VCMR VOH VOL Parameter Input High Current Input Low Current
Peak-to-Peak Input Voltage Common Mode Input Voltage; NOTE 1, 2 Output High Voltage; NOTE 3 Output Low Voltage; NOTE 3
VSWING Peak-to-Peak Output Voltage Swing 0.6 NOTE 1: Common mode input voltage is defined as VIH. NOTE 2: For single ended applications, the maximum input voltage for PCLK and nPCLK is VCC + 0.3V. NOTE 3: Outputs terminated with 50 to VCCO - 2V.
TABLE 5. AC CHARACTERISTICS, VCC = VCCO = 3.3V5%, TA = 0C TO 70C
Symbol fMAX tPD Parameter Maximum Output Frequency Propagation Delay; NOTE 1 Output Skew; NOTE 2, 4 Par t-to-Par t Skew; NOTE 3, 4 Output Rise Time Output Fall Time 20% to 80% @ 50MHz 20% to 80% @ 50MHz 300 300 250MHz 1 Test Conditions Minimum Typical Maximum 500 2 50 250 700 700 52 Units MHz ns ps ps ps ps %
t sk(o) t sk(pp)
tR tF
odc Output Duty Cycle 48 50 All parameters measured at 250MHz unless noted otherwise. NOTE 1: Measured from the differential input crossing point to the differential output crossing point. NOTE 2: Defined as skew between outputs at the same supply voltage and with equal load conditions. Measured at the output differential cross points. 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 the differential cross points. NOTE 4: This parameter is defined in accordance with JEDEC Standard 65.
8531AY-01
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REV. B AUGUST 9, 2001
Integrated Circuit Systems, Inc.
ICS8531-01
LOW SKEW, 1-TO-9 DIFFERENTIAL-TO-3.3V LVPECL FANOUT BUFFER
PARAMETER MEASUREMENT INFORMATION
VCCO V CC
SCOPE
Qx
LVPECL
VCC = 2.0V VCCO = 2.0V
nQx
VEE = -1.3V 0.135V
FIGURE 2 - OUTPUT LOAD TEST CIRCUIT
VCC
CLK, PCLK
V
nCLK, nPCLK
PP
Cross Points
V
CMR
VEE
FIGURE 3 - DIFFERENTIAL INPUT LEVEL
Qx
nQx
Qy
nQy
tsk(o)
FIGURE 4 - OUTPUT SKEW
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REV. B AUGUST 9, 2001
Integrated Circuit Systems, Inc.
ICS8531-01
LOW SKEW, 1-TO-9 DIFFERENTIAL-TO-3.3V LVPECL FANOUT BUFFER
Qx PART 1 nQx
Qy PART 2 nQy
tsk(pp)
FIGURE 5 - PART-TO-PART SKEW
80%
80% V
SWING
20% Clock Inputs and Outputs t t
AND
20%
R
F
FIGURE 6 - INPUT
OUTPUT RISE
AND
FALL TIME
CLK, PCLK
nCLK, nPCLK
Q0 - Q8 nQ0 - nQ8
t
PD
FIGURE 7 - PROPAGATION DELAY
CLK, PCLK, Qx nCLK, nPCLK, nQx
Pulse Width t t odc = t
PW PERIOD
PERIOD
FIGURE 8 - odc & tPERIOD
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REV. B AUGUST 9, 2001
Integrated Circuit Systems, Inc.
ICS8531-01
LOW SKEW, 1-TO-9 DIFFERENTIAL-TO-3.3V LVPECL FANOUT BUFFER APPLICATION INFORMATION
WIRING THE DIFFERENTIAL INPUT TO ACCEPT SINGLE ENDED LEVELS
Figure 9 shows how the differential input can be wired to accept single ended levels. The reference voltage V_REF ~ VCC/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 VCC = 3.3V, V_REF should be 1.25V and R2/R1 = 0.609.
VCC VCC R1 1K R1 1K
CLK_IN CLK_IN
+ + -
V_REF V_REF C1 0.1uF C1 0.1uF R2 1K R2 1K
FIGURE 9: SINGLE ENDED SIGNAL DRIVING DIFFERENTIAL INPUT
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REV. B AUGUST 9, 2001
Integrated Circuit Systems, Inc.
ICS8531-01
LOW SKEW, 1-TO-9 DIFFERENTIAL-TO-3.3V LVPECL FANOUT BUFFER POWER CONSIDERATIONS
This section provides information on power dissipation and junction temperature for the ICS8531-01. Equations and example calculations are also provided.
1. Power Dissipation. The total power dissipation for the ICS8531-01 is the sum of the core power plus the power dissipated in the load(s). The following is the power dissipation for VCC = 3.3V + 5% = 3.465V, which gives worst case results. NOTE: Please refer to Section 3 for details on calculating power dissipated in the load.
* *
Power (core)MAX = VCC_MAX * IEE_MAX = 3.465V * 70mA = 242.6mW Power (outputs)MAX = 30.2mW/Loaded Output pair If all outputs are loaded, the total power is 9 * 30.2mW = 271.8mW
Total Power_MAX (3.465V, with all outputs switching) = 242.6mW + 271.8mW = 514.4mW
2. Junction Temperature. Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad and directly affects the reliability of the device. The maximum recommended junction temperature for HiPerClockSTM devices is 125C.
The equation for Tj is as follows: Tj = JA * Pd_total + TA Tj = Junction Temperature JA = junction-to-ambient thermal resistance Pd_total = Total device power dissipation (example calculation is in section 1 above) TA = Ambient Temperature In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance JA must be used . Assuming a moderate air flow of 200 linear feet per minute and a multi-layer board, the appropriate value is 42.1C/W per Table 6 below. Therefore, Tj for an ambient temperature of 70C with all outputs switching is: 70C + 0.514W * 42.1C/W = 91.6C. This is well below the limit of 125C This calculation is only an example. Tj will obviously vary depending on the number of loaded outputs, supply voltage, air flow, and the type of board (single layer or multi-layer).
Table 6. Thermal Resistance qJA for 32-pin LQFP Forced Convection
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.
8531AY-01
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REV. B AUGUST 9, 2001
Integrated Circuit Systems, Inc.
3. Calculations and Equations.
ICS8531-01
LOW SKEW, 1-TO-9 DIFFERENTIAL-TO-3.3V LVPECL FANOUT BUFFER
The purpose of this section is to derive the power dissipated into the load. LVPECL output driver circuit and termination are shown in Figure 10.
VCCO
Q1
VOUT RL 50 VCCO - 2V
FIGURE 10 - LVPECL DRIVER CIRCUIT
AND
TERMINATION
To calculate worst case power dissipation into the load, use the following equations which assume a 50 load, and a termination voltage of V - 2V.
CC
Pd_H is power dissipation when the output drives high. Pd_L is the power dissipation when the output drives low.
Pd_H = [(VOH_MAX - (VCC_MAX - 2V))/R ] * (VCC_MAX - VOH_MAX)
L
Pd_L = [(V
OL_MAX
- (V
CC_MAX
- 2V))/R ] * (V
L
CC_MAX
-V
OL_MAX
)
*
For logic high, VOUT = V
OH_MAX
=V
CC_MAX
- 1.0V
Using VCC_MAX = 3.465, this results in VOH_MAX = 2.465V * For logic low, VOUT = V Using V
CC_MAX
OL_MAX
=V
CC_MAX
- 1.7V
OL_MAX
= 3.465, this results in V
= 1.765V
Pd_H = [(2.465V - (3.465V - 2V))/50] * (3.465V - 2.465V) = 20mW Pd_L = [(1.765V - (3.465V - 2V))/50] * (3.465V - 1.765V) = 10.2mW Total Power Dissipation per output pair = Pd_H + Pd_L = 30.2mW
8531AY-01
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REV. B AUGUST 9, 2001
Integrated Circuit Systems, Inc.
ICS8531-01
LOW SKEW, 1-TO-9 DIFFERENTIAL-TO-3.3V LVPECL FANOUT BUFFER RELIABILITY INFORMATION
TABLE 7. JAVS. AIR FLOW TABLE
q by Velocity (Linear Feet per Minute)
JA
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 all modern PCB designs use multi-layered boards, so the data in the second row will pertain to most designs.
TRANSISTOR COUNT
The transistor count for ICS8531-01 is: 632
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REV. B AUGUST 9, 2001
Integrated Circuit Systems, Inc.
ICS8531-01
LOW SKEW, 1-TO-9 DIFFERENTIAL-TO-3.3V LVPECL FANOUT BUFFER
PACKAGE OUTLINE
AND
DIMENSIONS - Y SUFFIX
TABLE 8. 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
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REV. B AUGUST 9, 2001
Integrated Circuit Systems, Inc.
ICS8531-01
LOW SKEW, 1-TO-9 DIFFERENTIAL-TO-3.3V LVPECL FANOUT BUFFER
Marking ICS8531AY-01 ICS8531AY-01 Package 32 Lead LQFP 32 Lead LQFP on Tape and Reel Count 250 per tray 1000 Temperature 0C to 70C 0C to 70C
TABLE 9. ORDERING INFORMATION
Part/Order Number ICS8531AY-01 ICS8531AY-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 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. 8531AY-01
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