HD74CDC2509B 3.3-V Phase-lock Loop Clock Driver ADE-205-218F (Z) 7th. Edition October 1999 Description The HD74CDC2509B is a high-performance, low-skew, low-jitter, phase-lock loop clock driver. It uses a phase-lock loop (PLL) to precisely align, in both frequency and phase, the feedback (FBOUT) output to the clock (CLK) input signal. It is specifically designed for use with synchronous DRAMs. The HD74CDC2509B operates at 3.3 V V CC and is designed to drive up to five clock loads per output. One bank of five outputs and one bank of four outputs provide nine low-skew, low-jitter copies of the input clock. Output signal duty cycles are adjusted to 50 percent independent of the duty cycle at the input clock. Each bank of outputs can be enabled or disabled separately via the control (1G and 2G) inputs. When the G inputs are high, the outputs switch in phase and frequency with CLK; when the G inputs are low, the outputs are disabled to the logic-low state. Unlike many products containing PLLs, the HD74CDC2509B does not require external RC networks. The loop filter for the PLL is included on-chip, minimizing component count, board space, and cost. Because it is based on PLL circuitry, HD74CDC2509B requires a stabilization time to achieve phase lock of the feedback signal to the reference signal. This stabilization time is required, following power up and application of a fixed-frequency, fixed-phase signal at CLK, as well as following any changes to the PLL reference or feedback signals. The PLL can be bypassed for test purposes by strapping AVCC to ground. Features • • • • • Meets “PC SDRAM registered DIMM design support document, Rev. 1.2” Phase-lock loop clock distribution for synchronous DRAM applications External feedback (FBIN) pin is used to synchronize the outputs to the clock input No external RC network required Support spread spectrum clock (SSC) synthesizers Note: Only by a change of a suffix (A to B) for standardization, there isn’t any change of the product. HD74CDC2509B Function Table Inputs Outputs 1G 2G CLK 1Y (0:4) 2Y (0:3) FBOUT X X L L L L L L H L L H L H H L H H H L H H L H H H H H H H H: L: X: High level Low level Immaterial Pin Arrangement AGND 1 24 CLK VCC 23 AVCC 2 1Y0 3 22 VCC 1Y1 4 21 2Y0 1Y2 5 20 2Y1 6 19 GND GND 7 18 GND 1Y3 8 17 2Y2 9 16 2Y3 VCC 10 15 VCC 1G 11 14 2G GND 1Y4 FBOUT 12 13 FBIN (Top view) 2 HD74CDC2509B Absolute Maximum Ratings Item Symbol Ratings Unit VCC –0.5 to 4.6 V VI –0.5 to 6.5 V VO –0.5 to VCC +0.5 V Input clamp current I IK –50 mA VI < 0 Output clamp current I OK ±50 mA VO < 0 or VO > VCC Continuous output current IO ±50 mA VO = 0 to VCC Supply current I CC or IGND ±100 mA Maximum power dissipation at Ta = 55°C (in still air) *3 PT 0.7 W Storage temperature Tstg –65 to +150 °C Supply voltage Input voltage *1 Output voltage Notes: *1, 2 Conditions Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute maximum rated conditions for extended periods may affect device reliability. 1. The input and output negative voltage ratings may be exceeded if the input and output clamp current ratings are observed. 2. This value is limited to 4.6 V maximum. 3. The maximum package power dissipation is calculated using a junction temperature of 150°C and a board trace length of 750 mils. Recommended Operating Conditions Item Symbol Min Typ Max Unit Supply voltage VCC 3.0 — 3.6 V Input voltage VIH 2.0 — — V VIL — — 0.8 VI 0 — VCC I OH — — –12 I OL — — 12 Ta 0 — 85 Output current Operating temperature Conditions mA °C Note: Unused inputs must be held high or low to prevent them from floating. 3 HD74CDC2509B Logic Diagram 1G 2G 11 3 1Y0 4 1Y1 5 1Y2 8 1Y3 9 1Y4 21 2Y0 14 20 17 CLK AVCC 4 2Y2 24 16 PLL FBIN 2Y1 13 23 12 2Y3 FBOUT HD74CDC2509B Pin Function Pin name No. Type Description CLK 24 I Clock input. CLK provides the clock signal to be distributed by the HD74CDC2509B clock driver. CLK is used to provide the reference signal to the integrated PLL that generates the clock output signals. CLK must have a fixed frequency and fixed phase for the PLL to obtain phase lock. Once the circuit is powered up and a valid CLK signal is applied, a stabilization time is required for the PLL to phase lock the feedback signal to its reference signal. FBIN 13 I Feedback input. FBIN provides the feedback signal to the internal PLL. FBIN must be hard-wired to FBOUT to complete the PLL. The integrated PLL synchronizes CLK and FBIN so that there is nominally zero phase error between CLK and FBIN. 1G 11 I Output bank enable. 1G is the output enable for outputs 1Y(0:4). When 1G is low, outputs 1Y(0:4)are disabled to a logic-low state. When 1G is high, all outputs 1Y(0:4) are enabled and switch at the same frequency as CLK. 2G 14 I Output bank enable. 2G is the output enable for outputs 2Y(0:3). When 2G is low, outputs 2Y(0:3)are disabled to a logic low state. When 2G is high, all outputs 2Y(0:3) are enabled and switch at the same frequency as CLK. FBOUT 12 O Feedback output. FBOUT is dedicated for external feedback. It switches at the same frequency as CLK. When externally wired to FBIN, FBOUT completes the feedback loop of the PLL. 1Y(0:4) 3, 4, 5, 8, 9 O Clock outputs. These outputs provide low-skew copies of CLK. Output bank 1Y(0:4) is enabled via the 1G input. These outputs can be disabled to a logic low state by deasserting the 1G control input. 2Y(0:3) 16, 17, 20, 21 O Clock outputs. These outputs provide low-skew copies of CLK. Output bank 2Y(0:3) is enabled via the 2G input. These outputs can be disabled to a logic low state by deasserting the 2G control input. AVCC 23 Power Analog power supply. AVCC provides the power reference for the analog circuitry. In addition, AV CC can be used to bypass the PLL for test purposes. When AV CC is strapped to ground, PLL is bypassed and CLK is buffered directly to the device outputs. AGND 1 Ground Analog ground. AGND provides the ground reference for the analog circuitry. VCC 2, 10, 15, 22 Power GND 6, 7, 18,19 Power supply Ground Ground 5 HD74CDC2509B Electrical Characteristics Typ *1 Max Unit Test Conditions — — –1.2 V VCC = 3 V, II = –18 mA VCC–0.2 — — V VCC = Min to Max, IOH = –100 µA 2.1 — — VCC = 3 V, IOH = –12 mA 2.4 — — VCC = 3 V, IOH = –6 mA — — 0.2 VCC = Min to Max, IOL = 100 µA — — 0.8 VCC = 3 V, IOL = 12 mA — — 0.55 VCC = 3 V, IOL = 6 mA Item Symbol Min Input clamp voltage VIK Output voltage VOH VOL Input current I IN — — ±5 µA VCC = 3.6 V, VIN = VCC or GND Quiescent supply current I CC — — 10 µA AVCC = GND, VCC = 3.6 V, VI = VCC or GND, IO = 0 ∆I CC — — 500 µA AVCC = GND, VCC = 3.3 to 3.6 V One input at V CC–0.6 V, Other inputs at V CC or GND Input capacitance CIN — 4 — pF VCC = 3.3 V, VI = VCC or GND Output capacitance CO — 6 — pF VCC = 3.3 V, VO = VCC or GND Note: 6 1. For conditions shown as Min or Max, use the appropriate value specified under recommended operating conditions. HD74CDC2509B Switching Characteristics (CL = 30 pF, Ta = 0 to 85°C) Item Symbol VCC = 3.3 V±0.3 V Min Typ Max Unit From (Input) To (Output) Phase error time t pe –150 — 150 ps 66 MHz < CLKIN↑ ≤ 100 MHz FBIN↑ Between output pins skew *1 t sk (O) — — 200 ps Any Y or FBOUT Any Y or FBOUT Cycle to cycle jitter –100 — 100 ps F (clkin = 100 MHz) Any Y or FBOUT Duty cycle 45 — 55 % F (clkin = Any Y or 66 to 100 MHz) FBOUT t TLH 5.0 — 1.0 volts/ns t THL 5.0 — 1.0 Vapsr *2 100 — — Output rise / fall time Analog power supply rejection (DC to 10 MHz) Notes: Any Y or FBOUT Any Y or FBOUT mVP–P AVCC The specifications for parameters in this table are applicable only after any appropriate stabilization time has elapsed. 1. The t sk(O) specification is only valid for equal loading of all outputs. 2. This parameter is characterized but not tested. Timing requirements Item Symbol Min Input clock frequency f clock Input clock duty cycle Stabilization time Note: *1 Max Unit 50 125 MHz 40 60 % — 1 ms Test Conditions After power up 1. Time required for the integrated PLL circuit to obtain phase lock of its feedback signal to its reference signal. In order for phase lock to be obtained, a fixed-frequency, fixed-phase reference signal must be present at CLK. Until phase lock is obtained, the specifications for propagation delay and skew parameters given in the switching characteristics table are not applicable. 7 HD74CDC2509B Test Circuit From output under test *1 C L = 30 pF Note: 1. 500 Ω CL includes probe and jig capacitance. Waveforms – 1 3V Input 50% VCC 50% VCC 0V Output (=FBOUT) 2V tTLH Notes: 1. 2. 8 VOH 2V 50% VCC 0.4 V 0.4 V VOL tTHL All input pulses are supplied by generators having the following characteristics: PRR ≤ 100 MHz, ZO = 50 Ω, t r = 1.2 ns, tf = 1.2 ns. The outputs are measured one at a time with one transition per measurement. HD74CDC2509B Waveforms – 2 CLKIN t phase error FBIN FBOUT t sk (o) Any Y Any Y t sk (o) Any Y 9 HD74CDC2509B Package Dimensions Unit : mm 7.80 8.10 Max 13 1 12 4.4 24 0.65 1.0 0.13 M 6.4 ± 0.2 0.10 Dimension including the plating thickness Base material dimension 10 0.17 ± 0.05 0.15 ± 0.04 1.10 Max 0.65 Max 0° – 8° 0.07 +0.03 –0.04 0.22 +0.08 –0.07 0.20 ± 0.06 0.5 ± 0.1 Hitachi Code JEDEC EIAJ Weight (reference value) TTP-24DB — — 0.08 g HD74CDC2509B Cautions 1. Hitachi neither warrants nor grants licenses of any rights of Hitachi’s or any third party’s patent, copyright, trademark, or other intellectual property rights for information contained in this document. Hitachi bears no responsibility for problems that may arise with third party’s rights, including intellectual property rights, in connection with use of the information contained in this document. 2. Products and product specifications may be subject to change without notice. Confirm that you have received the latest product standards or specifications before final design, purchase or use. 3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However, contact Hitachi’s sales office before using the product in an application that demands especially high quality and reliability or where its failure or malfunction may directly threaten human life or cause risk of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation, traffic, safety equipment or medical equipment for life support. 4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly for maximum rating, operating supply voltage range, heat radiation characteristics, installation conditions and other characteristics. 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