Datasheet

SM646UDR26485-2-I
January 31, 2006
Corporate Headquarters: P. O. Box 1757, Fremont, CA 94538, USA • Tel:[phone] • Fax:[phone] • E-mail: [e-mail]
Europe: 5 Kelvin Park South, Kelvin South, East Kilbride, G75 ORH, United Kingdom • Tel: [phone] • Fax: [phone]
Asia/Pacific: Plot 18, Lrg Jelawat 4, Kawasan Perindustrian Seberang Jaya 13700, Prai, Penang, Malaysia • Tel: [phone] • Fax: [phone]
23
Parameter Symbol
3.0ns @ CL5.0
DDR2-667
Unit Notes
Min Max
CKE low to CK,CK# uncertainity t
DELAY
3.475 3.475 ns 24
ACTIVE to ACTIVE (same bank) command t
RC
60 - ns
ACTIVE bank a to ACTIVE bank b command t
RRD
7.5 - ns 23
ACTIVE to READ or WRITE delay t
RCD
15 - ns
ACTIVE to PRECHARGE command t
RAS
45 70000 ns 16
Internal READ to precharge command delay t
RTP
7.5 - ns 19, 23
Write recovery time t
WR
15 - ns 23
Auto precharge write recovery + Precharge time t
DAL
t
WR
+ t
RP
-t
CK
18
Internal WRITE to READ command delay t
WTR
7.5 - ns 23
PRECHARGE command period t
RP
15 - ns
LOAD MODE command cycle time t
MRD
2- t
CK
REFRESH to REFRESH command interval t
RFC
105 - ns 10
Average periodic refresh Interval t
REFI
-7.8µs10
Exit self refresh to non-READ command t
XSNR
t
RFC
(min)
+ 10
-ns
Exit self refresh to READ command t
XSRD
200 - t
CK
ODT turn-on delay t
AOND
22t
CK
ODT turn-on t
AON
t
AC
(min) t
AC
(max)
+ 1000
ps 21
ODT turn-off delay t
AOFD
2.5 2.5 t
CK
ODT turn-off t
AOF
t
AC
(min) t
AC
(max)
+ 600
ps 22
ODT turn-on (power-down mode) t
AONPD
t
AC
(min) +
2000
2*t
CK
+
t
AC
(max)
+ 1000
ps
ODT turn-off (power-down mode) t
AOFPD
t
AC
(min) +
2000
2.5*t
CK
+
t
AC
(max)
+ 1000
ps
ODT to power-down entry latency t
ANPD
3t
CK
ODT power-down exit latency t
AXPD
8t
CK
Exit active power-down to READ command, MR[bit12=0] t
XARD
2- t
CK
Exit active power-down to READ command, MR[bit12=1] t
XARDS
7 - AL - t
CK
Exit precharge power down to any non-read command t
XP
2- t
CK
CKE minimum pulse width (high and low pulse width) t
CKE
3- t
CK
Device AC Operating Conditions (Contd.)