Rainbow Electronics W9864G6GB User Manual
Page 17
W9864G6GB
Publication Release Date: August 14, 2006
- 17 -
Revision A01
Notes:
1. Operation exceeds “ABSOLUTE MAXIMUM RATING” may cause permanent damage to the
devices.
2. All voltages are referenced to V
SS.
3. These parameters depend on the cycle rate and listed values are measured at a cycle rate with the
minimum values of T
ck
and T
rc
.
4. These parameters depend on the output loading conditions. Specified values are obtained with
output
open.
5. Power up Sequence
(1) Power up must be performed in the following sequence.
(2) Power must be applied to V
CC
and V
CC
Q (simultaneously) while all input signals are held in the “NOP” state. The CLK
signals must be started at the same time.
(3) After power-up a pause of at least 200 µseconds is required. It is required that DQM and CKE signals then be held ‘
high‘
(V
CC
levels) to ensure that the DQ output is impedance.
(4) All banks must be precharged.
(5) The Mode Register Set command must be asserted to initialize the Mode Register.
(6) A minimum of eight Auto Refresh dummy cycles is required to stabilize the internal circuitry of the device.
6. AC Testing Conditions
PARAMETER CONDITIONS
Output Reference Level
1.4V
Output Load
See diagram below
Input Signal Levels (V
IH
/V
IL
) 2.4V/0.4V
Transition Time (Rise and Fall) of Input Signal
1 Ns
Input Reference Level
1.4V
50 ohms
1.4 V
AC TEST LOAD
Z = 50 ohms
output
30pF
1. Transition times are measured between V
IH
and V
IL
.
2. T
hz
defines the time at which the outputs achieve the open circuit condition and is not referenced to output level.
3. These parameters account for the number of clock cycles and depend on the operating frequency of the clock, as
follows the number of clock cycles = specified value of timing/ clock period
(count fractions as whole number)
(1)
T
ch
is the pulse width of CLK measured from the positive edge to the negative edge referenced to V
IH
(min.).
T
cl
is the pulse width of CLK measured from the negative edge to the positive edge referenced to V
IL
(max.).