MC-45D16CB641 Datasheet, PDF (7/16 Pages) NEC – 16 M-WORD BY 64-BIT DDR SYNCHRONOUS DYNAMIC RAM MODULE UNBUFFERED TYPE

AC Characteristics (Recommended Operating Conditions unless otherwise noted)
Test Conditions
Parameter
Symbol
Value
Unit Notes
Input Reference voltage (Input timing measurement reference level) VREF
VDDQ x 0.5
V
Termination voltage (Output timing measurement reference level)
VTT
VREF
V
1
High level ac input voltage
Low level ac input voltage
Input differential voltage (CK0 - CK2 and /CK0 - /CK2)
VIH(ac)
VREF + 0.31
V
VIL(ac)
VREF − 0.31
V
VID(ac)
0.7
V
Input signal slew rate
SLEW
1
V/ns 2
Notes 1. Output waveform timing is measured where the output signal crosses through the VTT level.
2. Slew rate is to be maintained in the VIL (ac) to VIH(ac) range of the input signal swing. SLEW = (VIH(ac)-
VIL(ac))/ ∆t
Output
VTT
RT = 50 Ω
CLOAD = 30 pF
Preliminary Data Sheet E0034N10
7