hm628512c Renesas Electronics Corporation., hm628512c Datasheet - Page 10

• Manufacturer Part Number: hm628512c
• Description: Memory>low Power Sram 4 M Sram 512-kword 8-bit
• Manufacturer: Renesas Electronics Corporation.

HM628512C Series
Write Cycle
Parameter
Write cycle time
Chip selection to end of write
Address setup time
Address valid to end of write
Write pulse width
Write recovery time
WE to output in high-Z
Data to write time overlap
Data hold from write time
Output active from output in high-Z
Output disable to output in high-Z
Notes: 1. t
8
2. This parameter is sampled and not 100% tested.
3. A write occurs during the overlap (t
4. t
5. t
6. t
7. During this period, I/O pins are in the output state so that the input signals of the opposite phase to
8. If the CS low transition occurs simultaneously with the WE low transition or after the WE transition,
9. Dout is the same phase of the write data of this write cycle.
10. Dout is the read data of next address.
11. If CS is low during this period, I/O pins are in the output state. Therefore, the input signals of the
12. In the write cycle with OE low fixed, t
are not referred to output voltage levels.
transition of CS going low or WE going low. A write ends at the earlier transition of CS going high
or WE going high. t
the outputs must not be applied.
the output remain in a high impedance state.
opposite phase to the outputs must not be applied to them.
data bus contention. t
HZ
CW
AS
WR
, t
is measured from the address valid to the beginning of write.
is measured from CS going low to the end of write.
is measured from the earlier of WE or CS going high to the end of write cycle.
OHZ
and t
WHZ
are defined as the time at which the outputs achieve the open circuit conditions and
WP
WP
is measured from the beginning of write to the end of write.
t
DW
Symbol
t
t
t
t
t
t
t
t
t
t
t
WC
CW
AS
AW
WP
WR
WHZ
DW
DH
OW
OHZ
min + t
WP
WP
) of a low CS and a low WE. A write begins at the later
WHZ
must satisfy the following equation to avoid a problem of
max
HM628512C
-5
Min
55
50
0
50
40
0
0
25
0
5
0
Max
—
—
—
—
—
—
20
—
—
—
20
-7
Min
70
60
0
60
50
0
0
30
0
5
0
Max
—
—
—
—
—
—
25
—
—
—
25
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Notes
4
5
3, 12
6
1, 2, 7
2
1, 2, 7