HYS64V32300GU Datasheet, PDF (9/16 Pages) Infineon Technologies AG – 3.3 V 32M x 64/72-Bit, 256MByte SDRAM Modules 168-pin Unbuffered DIMM Modules

HYS 64/72V32300GU
SDRAM-Modules
Notes
1. All AC characteristics are shown for the SDRAM components.
An initial pause of 100 µs is required after power-up. Then a Precharge All Banks command must
be given followed by eight Auto Refresh (CBR) cycles before the Mode Register Set Operation
can begin.
2. AC timing tests have V_IL = 0.4 V and V_IH = 2.4 V with the timing referenced to the 1.4 V crossover
point. The transition time is measured between V_IH and V_IL. All AC measurements assume
t_T = 1 ns with the AC output load circuit shown in Figure below. Specified t_AC and t_OH parameters
are measured with a 50 pF only, without any resistive termination and with a input signal of 1V/
ns edge rate between 0.8 V and 2.0 V.
3. If clock rising time is longer than 1 ns, a time (t_T/2 − 0.5) ns must be added to this parameter.
4. Rated at 1.4 V.
5. If t_T is longer than 1 ns, a time (t_T − 1) ns must be added to this parameter.
6. Whenever the refresh Period has been exceeded, a minimum of two Auto (CBR) Refresh
commands must be given to “wake-up” the device.
7. Timing is a asynchronous. If setup time is not met by rising edge of the clock then the CKE signal
is assumed latched on the next cycle.
8. Self Refresh Exit is a synchronous operation and begins on the second positive clock edge after
CKE returns high. Self Refresh Exit is not complete until a time period equal to t_RC is satisfied
after the Self Refresh Exit command is registered.
9. This is referenced to the time at which the output achieved the open circuit condition, not to
output voltage levels.
CLOCK 1.4 V
t IS
tIH
t CH
2.4 V
0.4 V
tCL
tT
INPUT
OUTPUT
1.4 V
tAC
tLZ
tAC
tOH
tHZ
1.4 V
IO.vsd
I/O
50 pF
Measurement conditions for
t_AC and t_OH
Serial Presence Detect
A serial presence detect storage device - E²PROM - is assembled onto the module. Information
about the module configuration, speed, etc. is written into the E²PROM device during module
production using a serial presence detect protocol (I²C synchronous 2-wire bus).
INFINEON Technologies
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