hyb39s256400d Infineon Technologies Corporation, hyb39s256400d Datasheet - Page 24

• Manufacturer Part Number: hyb39s256400d
• Description: 256-mbit Synchronous Dram
• Manufacturer: Infineon Technologies Corporation

Table 15
Parameter
Refresh Cycle
Refresh Period (8192 cycles)
Self Refresh Exit Time
Data Out Hold Time
Read Cycle
Data Out to Low Impedance Time
Data Out to High Impedance
Time
DQM Data Out Disable Latency
Write Cycle
Last Data Input to Precharge
(Write without AutoPrecharge)
Last Data Input to Activate
(Write with AutoPrecharge)
DQM Write Mask Latency
1)
2) For proper power-up see the operation section of this data sheet.
3) AC timing tests for LV-TTL versions have
4) If clock rising time is longer than 1 ns, a time (
5)
6) If
7) These parameter account for the number of clock cycles and depend on the operating frequency of the clock, as follows:
8) It is recommended to use two clock cycles between the last data-in and the precharge command in case of a write command
9) When a Write command with AutoPrecharge has been issued, a time of
Data Sheet
T
The transition time is measured between
shown in figure below. Specified
and with an input signal of 1V / ns edge rate between 0.8 V and 2.0 V.
Access time from clock
Data out hold time
the number of clock cycles = specified value of timing period (counted in fractions as a whole number)
without Auto-Precharge. One clock cycle between the last data-in and the precharge command is also supported, but
restricted to cycle times tck greater or equal the specified twr value, where tck is equal to the actual system clock time.
Command can be applied. For each of the terms, if not already an integer, round up to the next highest integer.
to the actual system clock time.
A
t
T
= 0 to 70 °C;
is longer than 1 ns, a time (
AC Timing - Absolute Specifications –8/-7.5/–7/-6 (cont’d)
V
t
OH
SS
is 1.8 ns for PC133 components with no termination and 0 pF load.
= 0 V;
t
AC
is 4.6 ns for PC133 components with no termination and 0 pF load,
V
DD
,
t
T
V
t
AC
- 1) ns has to be added to this parameter.
DDQ
Symbol
t
t
t
t
t
t
t
t
t
REF
SREX
OH
LZ
HZ
DQZ
WR
DAL(min.)
DQW
and
= 3.3 V ± 0.3 V,
V
V
t
OH
IH
IL
and
= 0.4 V and
parameters are measured with a 50 pF only, without any resistive termination
min. max. min. max. min. max. min. max
–
1
3
0
3
—
15
(
0
t
t
T
WR
/2 - 0.5) ns has to be added to this parameter.
PC100 -
V
/
IL
222
t
–8
CK
. All AC measurements assume
64
—
—
—
8
2
—
—
) + (
t
T
V
24
= 1 ns
IH
t
RP
= 2.4 V with the timing referenced to the 1.4 V crossover point.
–
1
3
0
3
—
15
0
/
t
PC166 -
CK
–7.5
333
)
64
—
—
—
7
2
—
—
t
DAL(min)
HYB39S256[40/80/16]0D[C/T](L)
–
1
3
0
3
—
14
0
1)2)3)
PC166 -
256-MBit Synchronous DRAM
222
–7
has be fullfilled before the next Activate
64
—
—
—
7
2
—
—
t
T
= 1 ns with the AC output load circuit
Electrical Characteristics
–
1
2.5
0
3
—
12
0
PC166 -
10072003-13LE-FGQQ
333
–6
.
64
—
—
—
6
2
—
—
Rev. 1.02, 2004-02
ms
CLK
ns
ns
ns
CLK
ns
CLK
CLK
Unit Notes
t
CK
3)5)
8)
9)
is equal