CY7C1362C-166BGI Просмотр технического описания (PDF) - Cypress Semiconductor
Номер в каталоге
Компоненты Описание
производитель
CY7C1362C-166BGI Datasheet PDF : 31 Pages
| |||
CY7C1360C
CY7C1362C
conducted, the data presented to the DQs is written into the
corresponding address location in the memory core. If a Byte
Write is conducted, only the selected bytes are written. Bytes
not selected during a Byte Write operation will remain
unaltered. A synchronous self-timed Write mechanism has
been provided to simplify the Write operations.
Because the CY7C1360C/CY7C1362C is a common I/O
device, the Output Enable (OE) must be deasserted HIGH
before presenting data to the DQs inputs. Doing so will tri-state
the output drivers. As a safety precaution, DQs are automati-
cally tri-stated whenever a Write cycle is detected, regardless
of the state of OE.
Burst Sequences
The CY7C1360C/CY7C1362C provides a two-bit wraparound
counter, fed by A1, A0, that implements either an interleaved
or linear burst sequence. The interleaved burst sequence is
designed specifically to support Intel Pentium applications.
The linear burst sequence is designed to support processors
that follow a linear burst sequence. The burst sequence is user
selectable through the MODE input.
Asserting ADV LOW at clock rise will automatically increment
the burst counter to the next address in the burst sequence.
Both Read and Write burst operations are supported.
Sleep Mode
The ZZ input pin is an asynchronous input. Asserting ZZ
places the SRAM in a power conservation “sleep” mode. Two
clock cycles are required to enter into or exit from this “sleep”
mode. While in this mode, data integrity is guaranteed.
Accesses pending when entering the “sleep” mode are not
considered valid nor is the completion of the operation
guaranteed. The device must be deselected prior to entering
the “sleep” mode. CE1, CE2, CE3[2], ADSP, and ADSC must
remain inactive for the duration of tZZREC after the ZZ input
returns LOW.
Interleaved Burst Address Table
(MODE = Floating or VDD)
First
Address
A1, A0
00
Second
Address
A1, A0
01
Third
Address
A1, A0
10
01
00
11
10
11
00
11
10
01
Fourth
Address
A1, A0
11
10
01
00
Linear Burst Address Table (MODE = GND)
First
Address
A1, A0
00
01
10
11
Second
Address
A1, A0
01
10
11
00
Third
Address
A1, A0
10
11
00
01
Fourth
Address
A1, A0
11
00
01
10
ZZ Mode Electrical Characteristics
Parameter
IDDZZ
tZZS
tZZREC
tZZI
tRZZI
Description
Sleep mode standby current
Device operation to ZZ
ZZ recovery time
ZZ Active to sleep current
ZZ Inactive to exit sleep current
Test Conditions
ZZ > VDD – 0.2V
ZZ > VDD – 0.2V
ZZ < 0.2V
This parameter is sampled
This parameter is sampled
Min.
2tCYC
0
Max.
50
2tCYC
2tCYC
Unit
mA
ns
ns
ns
ns
Truth Table[3, 4, 5, 6, 7, 8]
Operation
Deselect Cycle, Power Down
Address
Used CE1 CE2 CE3 ZZ ADSP ADSC ADV WRITE OE CLK
None
H X XL X
L
X
X X L-H
DQ
Tri-State
Deselect Cycle, Power Down None
L L XL L
X
X
X X L-H Tri-State
Deselect Cycle, Power Down None
L X HL L
X
X
X X L-H Tri-State
Deselect Cycle, Power Down None
L L XL H
L
X
X X L-H Tri-State
Deselect Cycle, Power Down None
L X HL H
L
X
X X L-H Tri-State
Sleep Mode, Power Down
None
X X XH X
X
X
X
X X Tri-State
READ Cycle, Begin Burst
External L H L L L
X
X
X
L L-H
Q
READ Cycle, Begin Burst
External L H L L L
X
X
X H L-H Tri-State
WRITE Cycle, Begin Burst
External L H L L H
L
X
L
X L-H
D
Notes:
3. X = “Don't Care.” H = Logic HIGH, L = Logic LOW.
4. WRITE = L when any one or more Byte Write Enable signals and BWE = L or GW = L. WRITE = H when all Byte Write Enable signals, BWE, GW = H.
5. The DQ pins are controlled by the current cycle and the OE signal. OE is asynchronous and is not sampled with the clock.
6. CE1, CE2, and CE3 are available only in the TQFP package. BGA package has only two chip selects CE1 and CE2.
7. The SRAM always initiates a read cycle when ADSP is asserted, regardless of the state of GW, BWE, or BWX. Writes may occur only on subsequent clocks
after the ADSP or with the assertion of ADSC. As a result, OE must be driven HIGH prior to the start of the Write cycle to allow the outputs to tri-state. OE is a
don't care for the remainder of the Write cycle.
8. OE is asynchronous and is not sampled with the clock rise. It is masked internally during Write cycles. During a Read cycle all data bits are Tri-State when OE
is inactive or when the device is deselected, and all data bits behave as output when OE is active (LOW).
Document #: 38-05540 Rev. *H
Page 9 of 31
Share Link: 