EBE21RD4AGFA
-6E
667
-5C
-4A
Frequency (Mbps)
Parameter
533
400
Symbol min.
max.
min.
max.
min.
max.
Unit
ns
Notes
Active to precharge command tRAS
Active to auto-precharge delay tRAP
45
70000
45
70000
40
70000
tRCD min.
tRCD min.
tRCD min.
ns
Active bank A to active bank B
tRRD
7.5
7.5
7.5
ns
command period
Write recovery time
tWR
15
15
15
ns
Auto precharge write recovery
+ precharge time
(tWR/tCK)+
(tRP/tCK)
(tWR/tCK)+
(tRP/tCK)
(tWR/tCK)+
(tRP/tCK)
tDAL
tCK
1
Internal write to read command
delay
tWTR
tRTP
7.5
7.5
7.5
10
ns
Internal read to precharge
command delay
7.5
7.5
ns
Exit self refresh to a non-read
command
tXSNR tRFC + 10
tXSRD 200
tRFC + 10
tRFC + 10
ns
Exit self refresh to a read
command
200
2
200
2
tCK
tCK
tCK
Exit precharge power down to
any non-read command
tXP
2
2
Exit active power down to read
command
tXARD
2
2
3
Exit active power down to read
command
tXARDS 7− AL
6 − AL
6 − AL
tCK
2, 3
(slow exit/low power mode)
CKE minimum pulse width (high
and low pulse width)
tCKE
tOIT
3
3
3
tCK
ns
Output impedance test driver
delay
0
12
0
12
0
12
Auto refresh to active/auto
refresh command time
tRFC
105
105
105
ns
Average periodic refresh
interval
(0°C ≤ TC ≤ +85°C)
tREFI
tREFI
7.8
3.9
7.8
3.9
7.8
3.9
µs
µs
ns
(+85°C < TC ≤ +95°C)
Minimum time clocks remains
ON after CKE asynchronously tDELAY
drops low
tIS + tCK +
tIH
tIS + tCK +
tIH
tIS + tCK +
tIH
Notes: 1. For each of the terms above, if not already an integer, round to the next higher integer.
2. AL: Additive Latency.
3. MRS A12 bit defines which active power down exit timing to be applied.
4. The figures of Input Waveform Timing 1 and 2 are referenced from the input signal crossing at the
VIH(AC) level for a rising signal and VIL(AC) for a falling signal applied to the device under test.
5. The figures of Input Waveform Timing 1 and 2 are referenced from the input signal crossing at the
VIH(DC) level for a rising signal and VIL(DC) for a falling signal applied to the device under test.
CK
DQS
/CK
/DQS
tIS
tIH
tIS
tIH
tDS tDH
tDS tDH
VDDQ
VDDQ
VIH (AC)(min.)
VIH (DC)(min.)
VREF
VIH (AC)(min.)
VIH (DC)(min.)
VREF
VIL (DC)(max.)
VIL (AC)(max.)
VSS
VIL (DC)(max.)
VIL (AC)(max.)
VSS
Input Waveform Timing 1 (tDS, tDH)
Input Waveform Timing 2 (tIS, tIH)
Data Sheet E0794E20 (Ver. 2.0)
17
ELPIDA [ ELPIDA MEMORY ]
