CY7C1347G
Document #: 38-05516 Rev. *E
Page 7 of 21
to the DQs and DQPs inputs. Doing so tri-states the output
drivers. As a safety precaution, DQs and DQPs are automati-
cally tri-stated whenever a write cycle is detected, regardless
of the state of OE.
Burst Sequences
The CY7C1347G provides a two-bit wraparound counter, fed
by A[1:0], that implements either an interleaved or linear burst
sequence. The interleaved burst sequence is designed specif-
ically 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 automatically increments 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 before entering
the “sleep” mode. CE1, CE2, CE3, ADSP, and ADSC must
remain inactive for the duration of tZZREC after the ZZ input
returns LOW.
Interleaved Burst Sequence
First
Address
Second
Address
Third
Address
Fourth
Address
A[1:0]
A[1:0]
A[1:0]
A[1:0]
00
01
10
11
01
00
11
10
10
11
00
01
11
10
01
00
Linear Burst Sequence
First
Address
Second
Address
Third
Address
Fourth
Address
A[1:0]
A[1:0]
A[1:0]
A[1:0]
00
01
10
11
01
10
11
00
10
11
00
01
11
00
01
10
ZZ Mode Electrical Characteristics
Parameter
Description
Test Conditions
Min
Max
Unit
IDDZZ
Snooze mode standby current
ZZ > VDD − 0.2V
40
mA
tZZS
Device operation to ZZ
ZZ > VDD − 0.2V
2tCYC
ns
tZZREC
ZZ recovery time
ZZ < 0.2V
2tCYC
ns
tZZI
ZZ Active to snooze current
This parameter is sampled
2tCYC
ns
tRZZI
ZZ Inactive to exit snooze current
This parameter is sampled
0
ns
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