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IS61DDSB21M36A Datasheet(PDF) 6 Page - Integrated Silicon Solution, Inc |
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IS61DDSB21M36A Datasheet(HTML) 6 Page - Integrated Silicon Solution, Inc |
6 / 29 page IS61DDSB22M18A IS61DDSB21M36A Integrated Silicon Solution, Inc.- www.issi.com Rev. B 10/03/2014 6 Power-Up and Power-Down Sequences The recommendation of voltage apply sequence is : VDD → VDDQ 1)→V REF 2)→ V IN Notes: VDDQ can be applied concurrently with VDD. VREF can be applied concurrently with VDDQ. After power and clock signals are stabilized, device can be ready for normal operation after tKC-Lock cycles. In tKC- lock cycle period, device initializes internal logics and locks DLL. Depending on /Doff status, locking DLL will be skipped. The following timing pictures are possible examples of power up sequence. Sequence1. /Doff is fixed low After tKC-lock cycle of stable clock, device is ready for normal operation. Note) All inputs including clocks must be either logically High or Low during Power On stage. Timing above shows only one of cases. Sequence2. /Doff is controlled and goes high after clock being stable. Note) All inputs including clocks must be either logically High or Low during Power On stage. Timing above shows only one of cases. Power On stage Unstable Clock Period Stable Clock period Read to use K K# VDD VDDQ VREF VIN Power On stage Unstable Clock Period Stable Clock period Read to use K K# Doff# VDD VDDQ VREF VIN >tKC-lock for device initialization >tKC-lock for device initialization |
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