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
F
F
F
144PIN PC133 Unbuffered SO-DIMM
512MB With 32Mx8 CL3
AC Characteristics (TA = 0 to 65°C, VDD = 3.3V ± 0.3V, Vss= 0V)
Parameter Symbol Value Unit Note
System clock cycle time tCK 7.5 ns 1
CK high pulse width tCKH 2.5 ns 1
CK low pulse width tCKL(min) 2.5 ns 1
Access time from CK tAC 5.4 ns 1,2
Data-out hold time tOH 3.0 ns 1,2
CK to Data-out low impedance tLZ 0.0 ns 1,2
CK to Data-out high impedance tHZ 3.0 ns 1
Input setup time tAS, tCS, tDS, tCES 1.5 ns 1
CKE setup time for power down exit tCESP 2.0 ns 1
Input hold time tAH, tCH, tDH, tCEH 0.8 ns 1
Ref/Active to Ref/Active command period tRC 70.0 ns 1
Active to precharge command period tRAS (min) 45.0 ns 1
Active command to column command (same bank) tRCD 20.0 ns 1
Precharge to active command period tRP 20.0 ns 1
Write recovery or data-in to precharge lead time tDPL 15.0 ns 1
Active (a) to Active (b) command period tRRD 15.0 ns 1
Transition time (rise and fall) tT (min) 1.0 ns
Refresh period tREF (max) 64.0 ms
Note:
1. AC measurement assumes tT = 1ns. Reference level for timing of input signals is 1.5V.
2. Access time is measured at 1.5V. Load condition is CL = 50 pF
Transcend information Inc
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