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R1QFA7236AB Datasheet(PDF) 9 Page - Renesas Technology Corp

Part # R1QFA7236AB
Description  72-Mbit DDRII SRAM 2-word Burst
Download  36 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

R1QFA7236AB Datasheet(HTML) 9 Page - Renesas Technology Corp

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R1Q4A7236ABG / R1Q4A7218ABG Series
Rev. 0.11 : 2013.01.15
PAGE:9
hinS=11111.1111.1111.1111.1111---
11111.1111.1111.1111.1111---00000.0000.0000.0000.0000---
72M_36M
Status
Power Up &
Unstable Stage
NOP &
Set-up Stage
Normal
Operation
V
DD
SET-UP Cycle
V
DDQ
V
REF
/DOFF
2. Double clock mode
K, /K
Fix High (=Vddq)
C, /C
Status
Power Up &
Unstable Stage
NOP &
Set-up Stage
Normal
Operation
V
DD
SET-UP Cycle
V
DDQ
V
REF
/DOFF
1. Single clock mode (C and /C pins fixed High)
K, /K
Fix High (=Vddq)
General Description
Power-up and Initialization Sequence
-V
DD must be stable before K, /K clocks are applied.
- Recommended voltage application sequence : V
SS
V
DD
V
DDQ & VREF
V
IN. (0 V to VDD, VDDQ < 200 ms)
- Apply V
REF after VDDQ or at the same time as VDDQ.
- Then execute either one of the following three sequences.
1. Single Clock Mode (C and /C tied high)
- Drive /DOFF high (/DOFF can be tied high from the start).
- Then provide stable clocks (K, /K) for at least 1024 cycles (II series) or 20 us (II+ series).
These meet the QDR common specification of 20 us.
When the operating frequency is less than 180 MHz, 2048 cycles are required (II series).
2. Double Clock Mode (C and /C control outputs) (II series only)
- Drive /DOFF high (/DOFF can be tied high from the start)
- Then provide stable clocks (K, /K , C, /C) for at least 1024 cycles (II series).
This meets the QDR common specification of 20 us.
When the operating frequency is less than 180 MHz, 2048 cycles are required (II series).
3. DLL/PLL Off Mode (/DOFF tied low)
- In the "NOP and setup stage", provide stable clocks (K, /K) for at least 1024 cycles (II series) or 20 us (II+
series). These meet the QDR common specification of 20 us.
R10DS0177EJ0011


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