MT40A512M16JY-075EAIT Datasheet, PDF (141/358 Pages) Micron Technology – 8Gb: x4, x8, x16 DDR4 SDRAM

Figure 81: 4Gb with Fine Granularity Refresh Mode Example
Normal Temperature Operation – –40°C to 85°C
1x Mode
(–40°C to 85°C)
REF@260ns
2x Mode
(–40°C to 85°C)
REF@160ns
4x Mode
(–40°C to 85°C)
REF@110ns
t REFI ^{= 3.9μs}
REF@110ns
t REFI ^{= 7.8μs}
REF@160ns
t REFI ^{= 3.9μs}
REF@110ns
REF@110ns
REF@260ns
REF@160ns
t REFI ^{= 7.8μs}
REF@160ns
t REFI ^{= 3.9μs}
REF@110ns
REF@110ns
t REFI ^{= 3.9μs}
REF@110ns
REF@110ns
REF@260ns
REF@160ns
REF@110ns
t REFI ^{= 1.95μs}
t REFI ^{= 1.95μs}
t REFI ^{= 1.95μs}
t REFI ^{= 1.95μs}
t REFI ^{= 1.95μs}
t REFI ^{= 1.95μs}
t REFI ^{= 1.95μs}
t REFI ^{= 1.95μs}
1x Mode
(–40°C to 125°C)
REF@260ns
REF@260ns
REF@260ns
REF@260ns
REF@260ns
Extended Temperature Operation – –40°C to 125°C
2x Mode
(–40°C to 125°C)
REF@160ns
t REFI ^{= 3.9μs}
REF@160ns
REF@160ns
t REFI ^{= 3.9μs}
REF@160ns
REF@160ns
t REFI ^{= 3.9μs}
REF@160ns
REF@160ns
t REFI ^{= 3.9μs}
REF@160ns
REF@160ns
t REFI ^{= 1.95μs}
t REFI ^{= 1.95μs}
t REFI ^{= 1.95μs}
t REFI ^{= 1.95μs}
t REFI ^{= 1.95μs}
t REFI ^{= 1.95μs}
t REFI ^{= 1.95μs}
t REFI ^{= 1.95μs}
4x Mode
(–40°C to 125°C)
REF@110ns
REF@110ns
REF@110ns
REF@110ns
REF@110ns
REF@110ns
REF@110ns
REF@110ns
REF@110ns
REF@110ns
REF@110ns
REF@110ns
REF@110ns
REF@110ns
REF@110ns
REF@110ns
REF@110ns
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
REFI
REFI
REFI
REFI
REFI
REFI
REFI
REFI
REFI
REFI
REFI
REFI
REFI
REFI
REFI
REFI
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
0.975μs
0.975μs
0.975μs
0.975μs
0.975μs
0.975μs
0.975μs
0.975μs
0.975μs
0.975μs
0.975μs
0.975μs
0.975μs
0.975μs
0.975μs
0.975μs