IDT5T9306 2.5V LVDS 1:6 CLOCK BUFFER TERABUFFER II INDUSTRIAL TEMPERATURE RANGE 2.5V LVDS 1:6 CLOCK BUFFER TERABUFFERTM II DESCRIPTION: FEATURES: * * * * * * * * * * * IDT5T9306 The IDT5T9306 2.5V differential clock buffer is a user-selectable differential input to six LVDS outputs. The fanout from a differential input to six LVDS outputs reduces loading on the preceding driver and provides an efficient clock distribution network. The IDT5T9306 can act as a translator from a differential HSTL, eHSTL, LVEPECL (2.5V), LVPECL (3.3V), CML, or LVDS input to LVDS outputs. A single-ended 3.3V / 2.5V LVTTL input can also be used to translate to LVDS outputs. The redundant input capability allows for an asynchronous change-over from a primary clock source to a secondary clock source. Selectable reference inputs are controlled by SEL. The IDT5T9306 outputs can be asynchronously enabled/disabled. When disabled, the outputs will drive to the value selected by the GL pin. Multiple power and grounds reduce noise. Guaranteed Low Skew < 25ps (max) Very low duty cycle distortion < 125ps (max) High speed propagation delay < 1.75ns (max) Up to 1GHz operation Selectable inputs Hot insertable and over-voltage tolerant inputs 3.3V / 2.5V LVTTL, HSTL, eHSTL, LVEPECL (2.5V), LVPECL (3.3V), CML, or LVDS input interface Selectable differential inputs to six LVDS outputs Power-down mode 2.5V VDD Available in VFQFPN package APPLICATIONS: * Clock distribution FUNCTIONAL BLOCK DIAGRAM GL G PD A1 A2 Q1 OUTPUT CONTROL Q2 OUTPUT CONTROL Q3 OUTPUT CONTROL Q4 OUTPUT CONTROL Q5 OUTPUT CONTROL Q6 Q1 Q2 1 A1 A2 OUTPUT CONTROL 0 SEL The IDT logo is a registered trademark of Integrated Device Technology, Inc. INDUSTRIAL TEMPERATURE RANGE Q3 Q4 Q5 Q6 MARCH 2004 1 (c) 2004 Integrated Device Technology, Inc. DSC-6176/12 IDT5T9306 2.5V LVDS 1:6 CLOCK BUFFER TERABUFFER II INDUSTRIAL TEMPERATURE RANGE NC Q5 Q5 Q6 Q6 VDD SEL PIN CONFIGURATION 28 27 26 25 24 23 22 G 1 21 PD VDD 2 20 VDD Q1 3 19 Q4 Q1 4 18 Q4 VDD 5 17 VDD A1 6 16 A2 A1 7 15 A2 VFQFPN TOP VIEW 2 VDD Q3 Q3 VDD 10 11 12 13 14 Q2 9 Q2 8 GL GND IDT5T9306 2.5V LVDS 1:6 CLOCK BUFFER TERABUFFER II INDUSTRIAL TEMPERATURE RANGE CAPACITANCE(1) (TA = +25C, F = 1.0MHz) ABSOLUTE MAXIMUM RATINGS(1) Max Unit VDD Symbol Power Supply Voltage Description -0.5 to +3.6 V VI Input Voltage -0.5 to +3.6 V VO Output Voltage(2) -0.5 to VDD +0.5 V TSTG Storage Temperature -65 to +150 C TJ Junction Temperature 150 C Symbol CIN Parameter Min Typ. Max. Unit Input Capacitance -- -- 3 pF NOTE: 1. This parameter is measured at characterization but not tested NOTES: 1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. 2. Not to exceed 3.6V. RECOMMENDED OPERATING RANGE Symbol TA VDD Description Ambient Operating Temperature Internal Power Supply Voltage Min. -40 2.3 Typ. +25 2.5 Max. +85 2.7 Unit C V PIN DESCRIPTION Symbol A[1:2] A[1:2] I/O I I Type Adjustable(1,4) Adjustable(1,4) G I LVTTL GL I LVTTL Qn Qn SEL PD O O I I LVDS LVDS LVTTL LVTTL VDD GND NC PWR PWR Description Clock input. A[1:2] is the "true" side of the differential clock input. Complementary clock inputs. A[1:2] is the complementary side of A[1:2]. For LVTTL single-ended operation, A[1:2] should be set to the desired toggle voltage for A[1:2]: 3.3V LVTTL VREF = 1650mV 2.5V LVTTL VREF = 1250mV Gate control for differential outputs Q1 and Q1 through Q6 and Q6. When G is LOW, the differential outputs are active. When G is HIGH, the differential outputs are asynchronously driven to the level designated by GL(2). Specifies output disable level. If HIGH, "true" outputs disable HIGH and "complementary" outputs disable LOW. If LOW, "true" outputs disable LOW and "complementary" outputs disable HIGH. Clock outputs Complementary clock outputs Reference clock select. When LOW, selects A2 and A2. When HIGH, selects A1 and A1. Power-down control. Shuts off entire chip. If LOW, the device goes into low power mode. Inputs and outputs are disabled. Both "true" and "complementary" outputs will pull to VDD. Set HIGH for normal operation.(3) Power supply for the device core and inputs Power supply return for all power No connect; recommended to connect to GND NOTES: 1. Inputs are capable of translating the following interface standards: Single-ended 3.3V and 2.5V LVTTL levels Differential HSTL and eHSTL levels Differential LVEPECL (2.5V) and LVPECL (3.3V) levels Differential LVDS levels Differential CML levels 2. Because the gate controls are asynchronous, runt pulses are possible. It is the user's responsibility to either time the gate control signals to minimize the possibility of runt pulses or be able to tolerate them in down stream circuitry. 3. It is recommended that the outputs be disabled before entering power-down mode. It is also recommended that the outputs remain disabled until the device completes powerup after asserting PD. 4. The user must take precautions with any differential input interface standard being used in order to prevent instability when there is no input signal. 3 IDT5T9306 2.5V LVDS 1:6 CLOCK BUFFER TERABUFFER II INDUSTRIAL TEMPERATURE RANGE DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE FOR LVTTL(1) Symbol Parameter Input Characteristics IIH Input HIGH Current IIL Input LOW Current VIK Clamp Diode Voltage VIN DC Input Voltage VIH DC Input HIGH VIL DC Input LOW VTHI DC Input Threshold Crossing Voltage Single-Ended Reference Voltage(3) VREF Test Conditions VDD = 2.7V VDD = 2.7V VDD = 2.3V, IIN = -18mA 3.3V LVTTL 2.5V LVTTL Min. Typ.(2) Max Unit -- -- -- - 0.3 1.7 -- -- -- -- -- -- - 0.7 -- -- -- VDD /2 1.65 1.25 5 5 - 1.2 +3.6 -- 0.7 -- -- -- A V V V V V V NOTES: 1. See RECOMMENDED OPERATING RANGE table. 2. Typical values are at VDD = 2.5V, +25C ambient. 3. For A[1:2] single-ended operation, A[1:2] is tied to a DC reference voltage. DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE FOR DIFFERENTIAL INPUTS(1) Symbol Parameter Input Characteristics IIH Input HIGH Current IIL Input LOW Current VIK Clamp Diode Voltage VIN DC Input Voltage VDIF DC Differential Voltage(3) VCM DC Common Mode Input Voltage(4) Test Conditions VDD = 2.7V VDD = 2.7V VDD = 2.3V, IIN = -18mA Min. Typ.(2) Max Unit -- -- -- - 0.3 0.1 0.05 -- -- - 0.7 -- -- -- 5 5 - 1.2 +3.6 -- VDD A V V V V NOTES: 1. See RECOMMENDED OPERATING RANGE table. 2. Typical values are at VDD = 2.5V, +25C ambient. 3. VDIF specifies the minimum input differential voltage (VTR - VCP) required for switching where VTR is the "true" input level and VCP is the "complement" input level. The DC differential voltage must be maintained to guarantee retaining the existing HIGH or LOW input. The AC differential voltage must be achieved to guarantee switching to a new state. 4. VCM specifies the maximum allowable range of (VTR + VCP) /2. DC ELECTRICAL CHARACTERISTICS OVER RECOMMENDED OPERATING RANGE FOR LVDS(1) Symbol Parameter Output Characteristics VOT(+) Differential Output Voltage for the True Binary State VOT(-) Differential Output Voltage for the False Binary State VOT Change in VOT Between Complementary Output States VOS Output Common Mode Voltage (Offset Voltage) VOS Change in VOS Between Complementary Output States IOS Outputs Short Circuit Current Differential Outputs Short Circuit Current IOSD Test Conditions Min. Typ.(2) Max Unit VOUT + and VOUT - = 0V VOUT + = VOUT - 247 247 -- 1.125 -- -- -- -- -- -- 1.2 -- 12 6 454 454 50 1.375 50 24 12 mV mV mV V mV mA mA NOTES: 1. See RECOMMENDED OPERATING RANGE table. 2. Typical values are at VDD = 2.5V, TA = +25C ambient. 4 IDT5T9306 2.5V LVDS 1:6 CLOCK BUFFER TERABUFFER II INDUSTRIAL TEMPERATURE RANGE DIFFERENTIAL INPUT AC TEST CONDITIONS FOR HSTL Symbol Parameter VDIF Input Signal Swing(1) Value Units 1 V VX Differential Input Signal Crossing Point 750 mV DH Duty Cycle 50 % VTHI Input Timing Measurement Reference Level tR, tF Input Signal Edge Rate(4) (2) (3) Crossing Point V 2 V/ns NOTES: 1. The 1V peak-to-peak input pulse level is specified to allow consistent, repeatable results in an automatic test equipment (ATE) environment. This device meets the VDIF (AC) specification under actual use conditions. 2. A 750mV crossing point level is specified to allow consistent, repeatable results in an automatic test equipment (ATE) environment. This device meets the VX specification under actual use conditions. 3. In all cases, input waveform timing is marked at the differential cross-point of the input signals. 4. The input signal edge rate of 2V/ns or greater is to be maintained in the 20% to 80% range of the input waveform. DIFFERENTIAL INPUT AC TEST CONDITIONS FOR eHSTL Symbol Parameter VDIF Input Signal Swing(1) Value Units 1 V VX Differential Input Signal Crossing Point 900 mV DH Duty Cycle 50 % VTHI Input Timing Measurement Reference Level tR, tF Input Signal Edge Rate(4) (2) (3) Crossing Point V 2 V/ns NOTES: 1. The 1V peak-to-peak input pulse level is specified to allow consistent, repeatable results in an automatic test equipment (ATE) environment. This device meets the VDIF (AC) specification under actual use conditions. 2. A 900mV crossing point level is specified to allow consistent, repeatable results in an automatic test equipment (ATE) environment. This device meets the VX specification under actual use conditions. 3. In all cases, input waveform timing is marked at the differential cross-point of the input signals. 4. The input signal edge rate of 2V/ns or greater is to be maintained in the 20% to 80% range of the input waveform. DIFFERENTIAL INPUT AC TEST CONDITIONS FOR LVEPECL (2.5V) AND LVPECL (3.3V) Symbol Parameter VDIF Input Signal Swing VX Differential Input Signal Crossing Point(2) DH Duty Cycle VTHI Input Timing Measurement Reference Level tR, tF Input Signal Edge Rate(4) Value Units 732 mV LVEPECL 1082 mV LVPECL 1880 (1) 50 (3) % Crossing Point V 2 V/ns NOTES: 1. The 732mV peak-to-peak input pulse level is specified to allow consistent, repeatable results in an automatic test equipment (ATE) environment. This device meets the VDIF (AC) specification under actual use conditions. 2. 1082mV LVEPECL (2.5V) and 1880mV LVPECL (3.3V) crossing point levels are specified to allow consistent, repeatable results in an automatic test equipment (ATE) environment. This device meets the VX specification under actual use conditions. 3. In all cases, input waveform timing is marked at the differential cross-point of the input signals. 4. The input signal edge rate of 2V/ns or greater is to be maintained in the 20% to 80% range of the input waveform. 5 IDT5T9306 2.5V LVDS 1:6 CLOCK BUFFER TERABUFFER II INDUSTRIAL TEMPERATURE RANGE DIFFERENTIAL INPUT AC TEST CONDITIONS FOR LVDS Symbol Parameter VDIF Input Signal Swing(1) VX Differential Input Signal Crossing Point DH Duty Cycle VTHI Input Timing Measurement Reference Level(3) tR, tF Input Signal Edge Rate(4) Value Units 400 mV (2) 1.2 V 50 % Crossing Point V 2 V/ns NOTES: 1. The 400mV peak-to-peak input pulse level is specified to allow consistent, repeatable results in an automatic test equipment (ATE) environment. This device meets the VDIF (AC) specification under actual use conditions. 2. A 1.2V crossing point level is specified to allow consistent, repeatable results in an automatic test equipment (ATE) environment. This device meets the VX specification under actual use conditions. 3. In all cases, input waveform timing is marked at the differential cross-point of the input signals. 4. The input signal edge rate of 2V/ns or greater is to be maintained in the 20% to 80% range of the input waveform. AC DIFFERENTIAL INPUT SPECIFICATIONS(1) Symbol Parameter Min. Typ. Max Unit VDIF AC Differential Voltage(2) 0.1 -- 3.6 V VIX VCM Differential Input Crosspoint Voltage Common Mode Input Voltage Range(3) 0.05 0.05 -- -- VDD VDD V V VIN Input Voltage - 0.3 +3.6 V NOTES: 1. The output will not change state until the inputs have crossed and the minimum differential voltage range defined by VDIF has been met or exceeded. 2. VDIF specifies the minimum input voltage (VTR - VCP) required for switching where VTR is the "true" input level and VCP is the "complement" input level. The AC differential voltage must be achieved to guarantee switching to a new state. 3. VCM specifies the maximum allowable range of (VTR + VCP) /2. POWER SUPPLY CHARACTERISTICS FOR LVDS OUTPUTS(1) Symbol IDDQ ITOT IPD Parameter Quiescent VDD Power Supply Current Total Power VDD Supply Current Total Power Down Supply Current Test Conditions VDD = Max., All Input Clocks = LOW(2) Outputs enabled VDD = 2.7V., FREFERENCE CLOCK = 1GHz PD = LOW NOTES: 1. These power consumption characteristics are for all the valid input interfaces and cover the worst case conditions. 2. The true input is held LOW and the complementary input is held HIGH. 6 Typ. -- Max 250 Unit mA -- -- 240 5 mA mA IDT5T9306 2.5V LVDS 1:6 CLOCK BUFFER TERABUFFER II INDUSTRIAL TEMPERATURE RANGE AC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE(1,5) Symbol Skew Parameters tSK(O) tSK(P) Parameter Min. Typ. Max Unit Same Device Output Pin-to-Pin Skew(2) Pulse Skew(3) -- -- -- -- 25 125 ps ps tSK(PP) Propagation Delay tPLH tPHL Part-to-Part Skew(4) -- -- 300 ps Propagation Delay A, A Crosspoint to Qn, Qn Crosspoint -- 1.25 1.75 ns -- -- 1 GHz Output Gate Enable Crossing VTHI to Qn/Qn Crosspoint -- -- 3.5 ns Output Gate Disable Crossing VTHI to Qn/Qn Crosspoint Driven to GL Designated Level -- -- 3.5 ns PD Crossing VTHI to Qn = VDD, Qn = VDD Output Gate Disable Crossing VTHI to Qn/Qn Driven to GL Designated Level -- -- -- -- 100 100 S S fO Frequency Range(6) Output Gate Enable/Disable Delay tPGE tPGD Power Down Timing tPWRDN tPWRUP NOTES: 1. AC propagation measurements should not be taken within the first 100 cycles of startup. 2. Skew measured between crosspoints of all differential output pairs under identical input and output interfaces, transitions and load conditions on any one device. 3. Skew measured is the difference between propagation delay times tPHL and tPLH of any differential output pair under identical input and output interfaces, transitions and load conditions on any one device. 4. Skew measured is the magnitude of the difference in propagation times between any single differential output pair of two devices, given identical transitions and load conditions at identical VDD levels and temperature. 5. All parameters are tested with a 50% input duty cycle. 6. Guaranteed by design but not production tested. 7 IDT5T9306 2.5V LVDS 1:6 CLOCK BUFFER TERABUFFER II INDUSTRIAL TEMPERATURE RANGE DIFFERENTIAL AC TIMING WAVEFORMS 1/fo + VDIF VDIF = 0 - VDIF A[1:2] - A[1:2] tPHL tPLH + VDIF VDIF = 0 - VDIF Qn - Qn tSK(O) tSK(O) Qm - Qm Output Propagation and Skew Waveforms NOTES: 1. Pulse skew is calculated using the following expression: tSK(P) = | tPHL - tPLH | Note that the tPHL and tPLH shown above are not valid measurements for this calculation because they are not taken from the same pulse. 2. AC propagation measurements should not be taken within the first 100 cycles of startup. 8 + VDIF VDIF = 0 - VDIF IDT5T9306 2.5V LVDS 1:6 CLOCK BUFFER TERABUFFER II INDUSTRIAL TEMPERATURE RANGE + VDIF VDIF = 0 - VDIF A[1:2] - A[1:2] VIH VTHI VIL GL tPLH VIH VTHI VIL G tPGD tPGE + VDIF VDIF = 0 - VDIF Qn - Qn Differential Gate Disable/Enable Showing Runt Pulse Generation NOTE: 1. As shown, it is possible to generate runt pulses on gate disable and enable of the outputs. It is the user's responsibility to time the G signal to avoid this problem. A1 - A1 +VDIF VDIF=0 -VDIF A2 - A2 +VDIF VDIF=0 -VDIF G VIH VTHI VIL PD VIH VTHI VIL +VDIF VDIF=0 -VDIF Qn - Qn Power Down Timing NOTES: 1. It is recommended that outputs be disabled before entering power-down mode. It is also recommended that the outputs remain disabled until the device completes power-up after asserting PD. 2. The POWER DOWN TIMING diagram assumes that GL is HIGH. 3. It should be noted that during power-down mode, the outputs are both pulled to VDD. In the POWER DOWN TIMING diagram this is shown when Qn-Qn goes to VDIF = 0. 9 IDT5T9306 2.5V LVDS 1:6 CLOCK BUFFER TERABUFFER II INDUSTRIAL TEMPERATURE RANGE TEST CIRCUITS AND CONDITIONS VIN ~50 Transmission Line VDD/2 A D.U.T. Pulse Generator VIN A ~50 Transmission Line -VDD/2 Scope 50 50 Test Circuit for Differential Input DIFFERENTIAL INPUT TEST CONDITIONS Symbol VDD = 2.5V 0.2V Unit VTHI Crossing of A and A V 10 IDT5T9306 2.5V LVDS 1:6 CLOCK BUFFER TERABUFFER II INDUSTRIAL TEMPERATURE RANGE VDD A Pulse Generator Qn RL A D.U.T. VOS VOD RL Qn Test Circuit for DC Outputs and Power Down Tests VDD/2 SCOPE CL Z = 50 Pulse Generator A Qn 50 A D.U.T. 50 Qn Z = 50 CL -VDD/2 Test Circuit for Propagation, Skew, and Gate Enable/Disable Timing LVDS OUTPUT TEST CONDITION Symbol VDD = 2.5V 0.2V Unit CL 0(1) 8(1,2) pF RL 50 NOTES: 1. Specifications only apply to "Normal Operations" test condition. The TIA/EIA specification load is for reference only. 2. The scope inputs are assumed to have a 2pF load to ground. TIA/EIA - 644 specifies 5pF between the output pair. With CL = 8pF, this gives the test circuit appropriate 5pF equivalent load. 11 IDT5T9306 2.5V LVDS 1:6 CLOCK BUFFER TERABUFFER II INDUSTRIAL TEMPERATURE RANGE ORDERING INFORMATION IDT XXXXX Device Type XX Package X Process I -40C to +85C (Industrial) NL Thermally Enhanced Plastic Very Fine Pitch Quad Flat No Lead Package 5T9306 2.5V 1:6 LVDS Clock Buffer TerabufferTM II CORPORATE HEADQUARTERS 2975 Stender Way Santa Clara, CA 95054 for SALES: 800-345-7015 or 408-727-6116 fax: 408-492-8674 www.idt.com 12 for Tech Support: logichelp@idt.com (408) 654-6459