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Data Sheet
Rev.1.3
09.11.2010
DDR2 SDRAM COMPONENT ELECTRICAL CHARACTERISTICS AND RECOMMENDED
AC OPERATING CONDITIONS (Continued)
(0°C ≤ T CASE ≤ + 85 °C; V DDQ = +1.8V ± 0.1V, V DD = +1.8V ± 0.1V)
AC CHARACTERISTICS
PARAMETER
Address and control input hold time
CAS# to CAS# command delay
ACTIVE to ACTIVE (same bank)
SYMBOL
t IH
t CCD
t RC
6400-666
Min Max
0.25
2
60
5300-555
MIN MAX
0.4
2
55
4200-444
MIN MAX
0.5
2
55
Unit
ns
t CK
ns
command period
ACTIVE bank a to ACTIVE bank b
t RRD
7.5
7.5
7.5
ns
command
ACTIVE to READ or WRITE delay
Four bank Activate period
t RCD
t FAW
15
37.5
15
37.5
15
37.5
ns
ns
ACTIVE to PRECHARGE command
t RAS
45
70,000
40
70,000
40
70,000
ns
Internal READ to precharge command
t RTP
7.5
7.5
7.5
ns
delay
Write recovery time
Auto precharge write recovery +
precharge time
t WR
t DAL
15
t WR +
t RP
15
t WR +
t RP
15
t WR +
t RP
ns
ns
Internal WRITE to READ command delay t WTR
7.5
7.5
7.5
ns
PRECHARGE command period
PRECHARGE ALL command period
t RP
t RPA
15
t RP +
15
t RP +
15
t RP +
ns
ns
t CK
t CK
t CK
LOAD MODE command cycle time
CKE low to CK, CK# uncertainty
t MRD
t DELAY
2
t IS + t CK + t IH
2
t IS + t CK + t IH
2
t IS + t CK + t IH
t CK
t CK
REFRESH to ACTIVE or REFRESH to
t RFC
105
70,000
105
70,000
105
70,000
ns
REFRESH command interval
Average periodic refresh interval
t REFI
-
7.8
-
7.8
-
7.8
μs
(0°C<T C <85°C)
Average periodic refresh interval
-
3.9
-
3.9
-
3.9
(85°C<T C <95°)
Exit SELF REFRESH to non-READ
command
Exit SELF REFRESH to READ command
Exit SELF REFRESH timing reference
t XSNR
t XSRD
t ISXR
t RFC (min)
+ 10
200
t IS
t RFC (min)
+ 10
200
t IS
t RFC (min)
+ 10
200
t IS
ns
t CK
ps
ODT turn-on delay
t AOND
2
2
2
2
2
2
t CK
ODT turn-on
t AON
t AC (min) t AC (max) t AC (min) t AC (max) t AC (min) t AC (max)
+ 1,000 + 1,000 + 1,000
ps
ODT turn-off delay
t AOFD
2.5
2.5
2.5
2.5
2.5
2.5
t CK
ODT turn-off
ODT turn-on (power-down mode)
t AOF
t AONPD
t AC (min) t AC (max)
+ 600
t AC (min) 2 x t CK +
+ 2,000 t AC (max)
t AC (min) t AC (max)
+ 600
t AC (min) 2 x t CK +
+ 2,000 t AC (max)
t AC (min) t AC (max)
+ 600
t AC (min) 2 x t CK +
+ 2,000 t AC (max)
ps
ps
+ 1,000
+ 1,000
+ 1,000
ODT turn-off (power-down mode)
t AOFPD
t AC (min) 2.5 x t CK
+ 2,000 +
t AC (min) 2.5 x t CK
+ 2,000 +
t AC (min) 2.5 x t CK
+ 2,000 +
ps
t AC (max)
+ 1,000
t AC (max)
+ 1,000
t AC (max)
+ 1,000
ODT to power-down entry latency
t ANPD
3
3
3
t CK
Swissbit AG
Industriestrasse 4
CH-9552 Bronschhofen
Fon: +41 (0) 71 913 03 03
Fax: +41 (0) 71 913 03 15
www.swissbit.com
eMail: info@swissbit.com
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