5T905 Datasheet

Clock management


Features, Applications

Guaranteed Low Skew < 25ps (max) Very low duty cycle distortion High speed propagation delay < 2.5ns. (max) to 250MHz operation Very low CMOS power levels 1.5V VDDQ for HSTL interface Hot insertable and over-voltage tolerant inputs 3-level inputs for selectable interface Selectable HSTL, eHSTL, / 2.5V LVTTL, or LVEPECL input interface Selectable differential or single-ended inputs and five singleended outputs 2.5V VDD Available in TSSOP package

The IDT5T905 2.5V single data rate (SDR) clock buffer is a user-selectable single-ended or differential input to five single-ended outputs buffer built on advanced metal CMOS technology. The SDR clock buffer fanout from a single or differential input to five single-ended outputs reduces the loading on the preceding driver and provides an efficient clock distribution network. The IDT5T905 can act as a translator from a differential HSTL, eHSTL, 1.8V/2.5V LVTTL, LVEPECL, or single-ended 1.8V/2.5V LVTTL input to HSTL, eHSTL, 1.8V/2.5V LVTTL outputs. Selectable interface is controlled by 3-level input signals that may be hard-wired to appropriate high-mid-low levels. Multiple power and grounds reduce noise.

The IDT logo is a registered trademark of Integrated Device Technology, Inc.

Symbol VDD Description Power Supply Voltage(2) Output Power Input Voltage Output Voltage(3) Reference Voltage(3) Storage Temperature Junction Temperature Supply(2) Max �0.5 to VDDQ +165 150 Unit �C VDDQ VI VO VREF TSTG TJ

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. VDDQ and VDD internally operate independently. No power sequencing requirements need to be met. 3. Not to exceed 3.6V.

Symbol CIN Parameter Input Capacitance Min Typ. 3.5 Max. Unit pF

NOTES: 1. This parameter is measured at characterization but not tested. 2. Capacitance applies to all inputs except RxS and TxS.

Symbol VDDQ(1) VT Description Ambient Operating Temperature Internal Power Supply Voltage HSTL Output Power Supply Voltage Extended HSTL and 1.8V LVTTL Output Power Supply Voltage 2.5V LVTTL Output Power Supply Voltage Termination Voltage Min. Typ. VDD VDDQ / 2 Max. Unit �C

NOTE: 1. All power supplies should operate in tandem. If VDD or VDDQ is at maximum, then VDDQ or VDD (respectively) should be at maximum, and vice-versa.

Symbol A A/VREF I/O I Type Adjustable(1) Description Clock input. A is the "true" side of the differential clock input. If operating in single-ended mode, A is the clock input. Complementary clock input. A/VREF is the "complementary" side A if the input is in differential mode. If operating in single-ended mode, A/VREF is connected to GND. For single-ended operation in differential mode, A/VREF should be set to the desired toggle voltage for A: 2.5V LVTTL VREF 1250mV 1.8V LVTTL, eHSTL VREF = 900mV HSTL VREF = 750mV LVEPECL VREF = 1082mV Gate control for Qn outputs. When G is LOW, these outputs are enabled. When G is HIGH, these outputs are asynchronously disabled to the level designated by GL(4). Specifies output disable level. If HIGH, the outputs disable HIGH. If LOW, the outputs disable LOW. Clock outputs Selects single-ended 2.5V LVTTL (HIGH), 1.8V LVTTL (MID) clock input or differential (LOW) clock input Sets the drive strength of the output drivers be 2.5V LVTTL (HIGH), 1.8V LVTTL (MID) or HSTL (LOW) compatible. Used in conjunction with VDDQ to set the interface levels. Power supply for the device core and inputs Power supply for the device outputs. When utilizing 2.5V LVTTL outputs, VDDQ should be connected to VDD. Power supply return for all power

NOTES: 1. Inputs are capable of translating the following interface standards. User can select between: Single-ended 2.5V LVTTL levels Single-ended 1.8V LVTTL levels or Differential 2.5V/1.8V LVTTL levels Differential HSTL and eHSTL levels Differential LVEPECL levels 2. Outputs are user selectable to drive 2.5V, 1.8V LVTTL, eHSTL, or HSTL interface levels when used with the appropriate VDDQ voltage. 3. level inputs are static inputs and must be tied to VDD or GND or left floating. These inputs are not hot-insertable or over-voltage tolerant. 4. 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. 5. Pins listed as LVTTL inputs will accept 2.5V signals when RxS = HIGH or 1.8V signals when RxS = LOW or MID.



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