ii
ii
iPEMPEM
PEMPEM
PEM
2.4G2.4G
2.4G2.4G
2.4Gb SDRAM-DDRb SDRAM-DDR
b SDRAM-DDRb SDRAM-DDR
b SDRAM-DDR
AS4DDR32M72PBG
AS4DDR32M72PBG
Rev. 1.0 09/06 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
16
Austin Semiconductor, Inc.
29. The Input capacitance per pin group will not differ by more than this
maximum amount for any given device.
30. CLK and CLK# input slew rate must be > 1V/ns (>2V/ns differentially).
31. DQ and DM input slew rates must not deviate from DQS by more than
10%. If the DQ/DM/DQS slew rate is less than 0.5V/ns, timing must be
derated: 50ps must be added to tDS and tDH for each 100mV/ns reduction
in slew rate. If slew rate exceeds 4V/ns, functionality is uncertain.
32. VCC must not vary more than 4% if CKE is not active while any bank is
active.
33. The clock is allowed up to ±150ps of jitter. Each timing parameter is
allowed to vary by the same amount.
34. tHP min is the lesser of tCL minimum and tCH minimum actually applied to
the device CLK and CLK# inputs, collectively during bank active.
35. READs and WRITEs with auto precharge are not allowed to be issued until
tRAS(MIN) can be satisfied prior to the internal precharge command being
issued.
36. Any positive glitch must be less than 1/3 of the clock and not more than
+400mV or 2.9 volts, whichever is less. Any negative glitch must be less
than 1/3 of the clock cycle and not exceed either -300mV or 2.2 volts,
whichever is more positive.
37. Normal Output Drive Curves:
a) The full variation in driver pull-down current from minimum to maximum
process, temperature and voltage will lie within the outer bounding lines
of the V-I curve of Figure A.
b) The variation in driver pull-down current within nominal limits of voltage
and temperature is expected, but not guaranteed, to lie within the inner
bounding lines of the V-I curve of Figure A.
c) The full variation in driver pull-up current from minimum to maximum
process, temperature and voltage will lie within the outer bounding lines
of the V-I curve of Figure B.
d) The variation in driver pull-up current within nominal limits of voltage
and temperature is expected, but not guaranteed, to lie within the inner
bounding lines of the V-I curve of Figure B.
e) The full variation in the ratio of the maximum to minimum pull-up
and pull-down current should be between .71 and 1.4, for device drain-
to-source voltages from 0.1V to 1.0 Volt, and at the same voltage and
temperature.
f) The full variation in the ratio of the nominal pull-up to pull-down current
should be unity ¡À10%, for device drain-to-source voltages from 0.1V
to 1.0 Volt.
38. Reduced Output Drive Curves:
a) The full variation in driver pull-down current from minimum to maximum
process, temperature and voltage will lie within the outer bounding lines
of the V-I curve of Figure C.
b) The variation in driver pull-down current within nominal limits of voltage
and temperature is expected, but not guaranteed, to lie within the inner
bounding lines of the V-I curve of Figure C.
c) The full variation in driver pull-up current from minimum to maximum
process, temperature and voltage will lie within the outer bounding lines
of the V-I curve of Figure D.
d) The variation in driver pull-up current within nominal limits of voltage
and temperature is expected, but not guaranteed, to lie within the inner
bounding lines of the V-I curve of Figure B.
e) The full variation in the ratio of the maximum to minimum pull-up
and pull-down current should be between .71 and 1.4, for device drain-
to-source voltages from 0.1V to 1.0 Volt, and at the same voltage and
temperature.
f) The full variation in the ratio of the nominal pull-up to pull-down current
should be unity ±10%, for device drain-to-source voltages from 0.1V
to 1.0 Volt.
39. The voltage levels used are derived from a minimum VCC level and the
referenced test load. In practice, the voltage levels obtained from a
properly terminated bus will provide significantly different voltage values.
40. VIH overshoot: VIH(MAX) = VCCQ+1.5V for a pulse width < 3ns and the
pulse width can not be greater than 1/3 of the cycle rate.
41. VCC and V CCQ must track each other.
42. This maximum value is derived from the referenced test load. In practice,
the values obtained in a typical terminated design may reflect up to
310ps less for tHZ(MAX) and the last DVW. tHZ(MAX) will prevail over
tDQSCK(MAX) + tRPST(MAX) condition. tLZ(MIN) will prevail over tDQSCK(MIN)
+ tRPRE(MAX) condition.
43. For slew rates greater than 1V/ns the (LZ) transition will start about 310ps
earlier.
44. During initialization, VCCQ, VTT, and VREF must be equal to or less than VCC
+ 0.3V. Alternatively, VTT may be 1.35V maximum during power up, even
if VCC/VCCQ are 0 volts, provided a minimum of 42 ohms of series
resistance is used between the VTT supply and the input pin.
45. The current part operates below the slowest JEDEC operating frequency
of 83 MHz. As such, future die may not reflect this option.
46. Reserved for future use.
47. Reserved for future use.
48. Random addressing changing 50% of data changing at every transfer.
49. Random addressing changing 100% of data changing at every transfer.
50. CKE must be active (high) during the entire time a refresh command is
executed. That is, from the time the AUTO REFRESH command is
registered, CKE must be active at each rising clock edge, until tRFC has
been satisfied.
51. ICC2N specifies the DQ, DQS, and DM to be driven to a valid high or low
logic level. ICC2Q is similar to ICC2F except ICC2Q specifies the address
and control inputs to remain stable. Although ICC2F, ICC2N, and ICC2Q are
similar, ICC2F is “worst case.”
52. Whenever the operating frequency is altered, not including jitter, the DLL
is required to be reset. This is followed by 200 clock cycles before any
READ command.
53. VTT is not applied directly to the device; however, tVTD should be greater
than or equal to zero to avoid device latch-up. VCCQ, VTT and VREF must
be equal to or less than VCC + 0.3V. Alternatively VTT may be 1.35V max
during power-up even if VCC/VCCQ are 0V, provided a minimum of 42 &! of
series resistance is used between the VTT supply and the input pin. Once
initialized, VREF must always be powered within the specified range.
80 0
Nominal low
Minimum
Maximum
Nominal high
Maximum
Nominal high
Nominal low
Minimum
-10
70
-20
60
-30
50
I
OUT
(mA)
-40
I
OUT
(mA)
40
-50
30
-60
20
-70
10
-80
0
0.0 0.5 1.0 1.5 2.0 2.5 0.0 0.5 1.0 1.5 2.0 2.5
V
OUT
(V) V
CCQ -
V
OUT
(V)
FIGURE C - PULL-DOWN CHARACTERISTICS FIGURE D - PULL-UP CHARACTERISTICS