Datasheet

T
T
T
S
S
S
6
6
6
4
4
4
M
M
M
S
S
S
S
S
S
6
6
6
4
4
4
V
V
V
6
6
6
L
L
L
144PIN PC133 Unbuffered SO-DIMM
512MB With 32M X 8 CL3
AC OPERATING TEST CONDITIONS (VDD = 3.3V ± 0.3V, TA = 0 to 65°C)
Parameter Value Unit
AC Input levels (V IH /V IL ) 2.4/0.4 V
Input timing measurement reference level 1.4 V
Input rise and fall time tr/tf=1/1 ns
Output timing measurement reference level 1.4 V
Output load condition See Fig. 2
Output
(Fig. 1) DC Output Load Circuit
3.3V
1200 Ohm
50pF
870 Ohm
V
OH (DC)=2.4V, I OH =-2mA
V
OL (DC)=0.4V, I OL =2mA
Output
(Fig. 2) AC Output Load Circuit
Vtt=1.4V
50 Ohm
50pF
Z0=50 Ohm
AC Characteristics (TA = 0 to 65°C, VDD = 3.3V ± 0.3V, Vss= 0V)
Parameter Symbol Value Unit Note
System clock cycle time
t CK
7.5 ns 1
CK high pulse width
t CKH
2.5 ns 1
CK low pulse width
t CKL (min)
2.5 ns 1
Access time from CK
t AC
5.4 ns 1,2
Data-out hold time
t OH
3.0 ns 1,2
CK to Data-out low impedance
t LZ
0.0 ns 1,2
CK to Data-out high impedance
t HZ
3.0 ns 1
Input setup time
T AS, t CS, t DS, t CES
1.5 ns 1
CKE setup time for power down exit
t CESP
2.0 ns 1
Input hold time
T AH, t CH, t DH, t CEH
0.8 ns 1
Ref/Active to Ref/Active command period
T RC ( min )
70.0 ns 1
Active to precharge command period
T RAS (min)
45.0 ns 1
Active command to column command (same bank)
t RCD
20.0 ns 1
Precharge to active command period
t RP
20.0 ns 1
Write recovery or data-in to precharge lead time
t DPL
15.0 ns 1
Active (a) to Active (b) command period
t RRD
15.0 ns 1
Transition time (rise and fall)
t T (min)
1.0 ns
Refresh period
T REF (max)
64.0 ms
Note:
1. AC measurement assumes t T = 1ns. Reference level for timing of input signals is 1.5V.
2. Access time is measured at 1.5V. Load condition is C L = 50 pF
Transcend information Inc.
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