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                  Home > DDR Termination Regulators
                  UR5517 Datasheet


                  The UR5517 is a linear regulator which provides up to 3 Amp
                  bi-directional sourcing and sinking capability for DDR1/2/3 SDRAM
                  bus terminator applications. It only requires 20uF of ceramic output
                  capacitance by a integrated operational amplifier which provides fast
                  load transient response.
                  The UR5517 also includes two control pins, S3 & S5. If S3 were
                  set in low level, VTT will be turned off and left Hi-Z(sleep-state
                  mode).If setting S5 were set in low level, both VTT and VTTREF will
                  be turned off and discharged to ground(soft-off mode).
                  * Input Voltage Range::3~5.5V
                  * VLDOIN Voltage Range:1.2V~3.6V
                  * DDR1/2/3 Termination Voltage Applications
                  * Sourcing and Sinking Current up to 3A
                  * ±20mV Accuracy for VTT and VTTREF
                  * 10mA Buffered Reference(VTTREF)
                  * Supports High-Z in S3(STR) and Soft-off in S5(Shutdown)
                  * Integrated Divider Tracks 1/2 VDDQSNS for Both VTT&VTTREF
                  * Built-In Soft-Start
                  * Current Limiting Protection
                  * Thermal Shutdown Protection
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