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PAL20RS4CNS Suppliers and PAL20RS4CNS Datasheet |
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PAL20RS4CNS Datasheet:The PAL20RS4CNS Clock Driver uses an internal phase locked loop (PLL) to lock low skew outputs to one of two reference clock inputs. Eight outputs are available: Q0-Q4, 2xQ, Q/2, Q5. Careful layout and design insures < 500ps skew between the Q0-Q4, and Q/2 outputs. The PAL20RS4CNS includes an internal RC filter which provides excellent jitter characteris- tics and eliminates the need for external components. In addition, TTL level outputs reduce clock signal noise. Various combinations of feed- back and a divide-by-2 in the VCO path allow applications to be custom- ized for linear VCO operation over a wide range of input SYNC fre- quencies. The VCO can also be disabled by the PLL_EN signal to allow low frequency or DC testing. The LOCK output asserts to indicate when phase lock has been achieved. The PAL20RS4CNS is designed for use in high-performance workstations, multi-board computers, networking hardware, and mainframe systems. Several can be used in parallel or scattered throughout a system for guaranteed low skew, system-wide clock distri- bution networks.PAL20RS4CNS Suppliers:*The _ _ are placeholders for the threshold voltage levels of the devices. Substitute the part number suffix in the Voltage Thres- hold Levels table for the desired voltage level. All devices are available in tape-and-reel only. There is a 2500 piece minimum order increment for the SOT package.PAL20RS4CNS On stock:NOTES: 1. Maximum is 1.0% A.Q.L. standard for all specifications except TCR. (For TCR information see notes 2 and 3). Typical is a designers reference which represents that 85% of the lots supplied, over a long period of time, will be at least the figure stated or better.For driving the N-Channel gates, it is important to keep in mind that it is essentially like driving a capacitance to a sufficient voltage to get the channel fully on. Driving the gates to +15 volts with respect to their sources assures that the transistors are on. This will keep the dissipation down to a minimum level [RDS(ON) specified in the data sheet]. How quickly the gate gets turned ON and OFF will determine the dissipation of the transistor while it is transitioning from OFF to ON, and vice-versa. Turning the gate ON and OFF too slow will cause excessive dissipation, while turning it ON and OFF too fast will cause excessive switching noise in the system. It is important to have as low a driving impedance as practical for the size of the transistor. Many motor drive IC's have sufficient gate drive capability for the MSK 3003. If not, paralleled CMOS standard gates will usually be sufficient. A series resistor in the gate circuit slows it down, but also suppresses any ringing caused by stray inductances in the MOSFET circuit. The selection of the resistor is determined by how fast the MOSFET wants to be switched. See Figure 1 for circuit details. Mail2 register flag. MBF2 is set low by the low-to-high transition of CLKB that writes data to the mail2 register. Writes to the mail2 register are inhibited while MBF2 is low. MBF2 is set high by a low-to-high transition of CLKA when a port-A read is selected and MBA is high. MBF2 is set high when the device is reset. The AK6420B/40B/80B is a 2048/4096/8192bit, serial, read/write, non-volatile memory device fabricated using an advanced CMOS E2PROM technology. The AK6420B has 2048bits of memory organized into 128 registers of 16 bits each. The AK6440B has 4096bits of memory organized into 256 registers of 16 bits each. The AK6480B has 8192bits of memory organized into 512 registers of 16 bits each. The AK6420B/40B/80B can operate full function under wide operating voltage range from 1.8V to 5.5V. The charge up circuit is integrated for high voltage generation that is used for write operation. The AK6420B/40B/80B can connect to the serial communication port of popular one chip microcomputer directly (3 line negative clock synchronous interface). At write operation, AK6420B/40B/80B takes in the write data from data input pin (DI) to a register synchronously with rising edge of input pulse of serial clock pin (SK). And at read operation, AK6420B/40B/80B takes out the read data from a register to data output pin (DO) synchronously with falling edge of SK. The AK6420B/40B/80B has 4 instructions such as READ, WRITE, WREN (write enable) and WRDS (write disable). Each instruction is organized by op-code block (8bits), address block (8bits) and data (8bits Õ 2). When input level of SK pin is high level and input level of chip select (CS) pin is changed from high level to low level, AK6420B/40B/80B can receive the instructions. Special features of the AK6420B/40B/80B include : automatic write time-out with auto-ERASE, Ready/Busy status signal output and ultra-low standby power mode when deselected (CS=high). Chip Select (CS) When CS is HIGH, the X25097 is deselected and the SO output pin is at high impedance and unless an internal write operation is underway, the X25097 will be in the standby power mode. CS LOW enables the X25097, placing it in the active power mode. It should be noted that after power-up, a HIGH to LOW transition on CS is required prior to the start of any operation. |
