written into the location specified on the address pins (A
through A17). If Byte High Enable (BHE) is LOW, then data
• High speed
—t
= 15 ns
AA
• Low active power
—612 mW (max.)
• Low CMOS standby power (Commercial L version)
—1.8 mW (max.)
• 2.0V Data Retention (600 µW at 2.0V retention)
• Automatic power-down when deselected
• TTL-compatible inputs and outputs
• Easy memory expansion with CE
and OE features
Functional Description
The CY7C1041V33 is a hig h-perform ance CMOS Static RAM
organized as 262,144 words by 16 bits .
Writing to the device is accomplished by taking Chip Enable
) and Write Enable (WE) inputs LOW. If Byte Low Enable
(CE
) is LOW, then data from I/O pins (I/O0 through I/O7), is
(BLE
from I/O pins (I/O
specified on the address pins (A
Reading from the device is accomplished by taking Chip
Enable (CE
Write Enable (WE
then data from the memory location specified by the address
pins will appear on I/O
LOW , then data from me mory will appea r on I/O
the truth tab le at the back of th is data sheet for a c omplete
description of read and write modes.
The input/output pins (I/O
high-impedance state when the device is deselected (CE
HIGH), the outputs are disabled (OE HIGH), the BHE and BLE
are disabled (BHE, BLE HIGH), or during a write operation (CE
LOW, and WE LOW).
The CY7C1041V33 is available in a standard 44-pin
400-mil-wide body width SOJ and 44-pin TSOP II package
with center power and ground (revolutionary) pi nout.
4. Test conditions assume signal transition time of 3 ns or less, timing reference levels of 1.5V, input pulse levels of 0 to 3.0V, and output loading of the specified
I
OL/IOH
5. t
HZOE
6. At any given temperature and voltage condition, t
7. The internal write time of the memory is defined by the overlap of CE
these signals ca n terminat e the write. The i nput data set-up and h old t iming s hould be referenc ed to the l eading e dge of the s ignal that t erminat es th e write.
8. The minimum write cycle time for Write Cycle No. 3 (WE
Read Cycle Time121517ns
Address to Data Valid121517ns
Data Hold from Address Change333 ns
CE LOW to Data Valid121517ns
OE LOW to Data Valid678ns
OE LOW to Low Z000 ns
[6]
[5, 6]
[5, 6]
677ns
333 ns
677ns
OE HIGH to High Z
CE LOW to Low Z
CE HIGH to High Z
CE LOW to Power-Up000 ns
CE HIGH to Power-Down121517ns
Byte Enable to Data Valid677ns
Byte Enable to Low Z000 ns
Byte Disable to High Z678ns
[7, 8]
Write Cycle Time121517ns
CE LOW to Write End101212ns
Address Set-Up to Write End101212ns
Address Hold from Write End000 ns
Address Set-Up to Write Start000 ns
WE Pulse Width101212ns
Data Set-Up to Write End789 ns
Data Hold from Write End000 ns
WE HIGH to Low Z
WE LOW to High Z
[6]
[5, 6]
333 ns
678ns
Byte Enable to End of Write101212ns
and 30-pF load capacitance.
, t
HZCE
, and t
are specified wi th a load cap acit ance of 5 pF as in p art (b) of AC Test Loads. Trans ition is me asured ±500 mV from stea dy-st ate vo ltage.
HZWE
is less than t
HZCE
controlled, OE LOW) is the sum of t
, t
LZCE
is less than t
HZOE
LOW, and WE LOW . CE and WE mus t be L OW to i nitiate a wr ite, and the t ran sition of eith er of
LZOE
, and t
HZWE
is less than t
HZWE
and tSD.
for any given dev ice.
LZWE
Document #: 38-05069 Rev. **Page 4 of 11
CY7C1041V33
Switching Characteristics
[4]
Over the Operating Range (continued)
ParameterDescription
READ CYCLE
t
RC
t
AA
t
OHA
t
ACE
t
DOE
t
LZOE
t
HZOE
t
LZCE
t
HZCE
t
PU
t
PD
t
DBE
t
LZBE
t
HZBE
WRITE CYCLE
t
WC
t
SCE
t
AW
t
HA
t
SA
t
PWE
t
SD
t
HD
t
LZWE
t
HZWE
t
BW
Read Cycle T ime2025ns
Address to Data Valid2025ns
Data Hold from Address Change35ns
CE LOW to Data Valid2025ns
OE LOW to Data Valid810ns
OE LOW to Low Z00ns
OE HIGH to High Z
CE LOW to Low Z
CE HIGH to High Z
[5, 6]
[6]
[5, 6]
CE LOW to Power-Up00ns
CE HIGH to Power-Down2025ns
Byte Enable to Data Valid810ns
Byte Enable to Low Z00ns
Byte Disable to High Z810ns
[7,8]
Write Cycle Time2025ns
CE LOW to Write End1315ns
Address Set-Up to Write End1315ns
Address Hold from Write End00ns
Address Set-Up to Write Start00ns
WE Pulse Width1315ns
Data Set-Up to Write End910ns
Data Hold from Write End00ns
WE HIGH to Low Z
WE LOW to High Z
[6]
[5, 6]
Byte Enable to End of Write1315ns
1041V33-201041V33-25
UnitMin.Max.Min.Max.
810ns
35ns
810ns
35ns
810ns
Data Retention Characteristics Over the Operating Range (For L version only)
ParameterDescriptionConditions
V
DR
I
CCDR
[3]
t
CDR
[9]
t
R
Notes:
< 3 ns for the –12 and –15 speeds. tr < 5 ns for the –20 and slower speeds.
9. t
r
10. No input may exceed V
VCC for Data Retention2.0V
Data Retention CurrentVCC = VDR = 2.0V ,
Chip Deselect to Data
Retention Time
CE > VCC – 0.3V,
> VCC – 0.3V or VIN < 0.3V
V
IN
Operation Recovery Timet
+ 0.5V.
CC
Document #: 38-05069 Rev. **Page 5 of 11
[10]
Min.Max.Unit
330µA
0ns
RC
ns
Data Retention Waveform
V
CC
CE
Switching Waveforms
t
CDR
CY7C1041V33
DATA RETENTION MODE
VDR> 2V
3.0V3.0V
t
R
1041V33–5
Read Cycle No. 1
[11, 12]
ADDRESS
DATA OUT
PREVIOUS DATA VALIDDATA VALID
Read Cycle No. 2(OE Controlled)
ADDRESS
CE
OE
BHE, BLE
DATA OUT
V
CC
SUPPLY
CURRENT
HIGH IMPEDANCE
t
LZCE
t
PU
[12, 13]
t
ACE
t
DOE
t
LZOE
t
DBE
t
LZBE
t
OHA
50%
t
RC
t
AA
1041V33-6
t
RC
t
HZOE
t
HZCE
t
DATA VALID
HZBE
t
PD
HIGH
IMPEDANCE
I
ICC
CC
50%
I
ISB
SB
1041V33-7
Notes:
11. Device is continuously selected. OE
12. WE
is HIGH for read cycle .
13. Address valid prior to or coincident with CE
, CE, BHE and/or BHE = VIL.
transition LOW .
Document #: 38-05069 Rev. **Page 6 of 11
Switching Waveforms (continued)
CY7C1041V33
Write Cycle No. 1 (CE Controlled)
ADDRESS
t
CE
WE
BHE, BLE
DATAI/O
SA
[14, 15]
t
AW
t
WC
t
SCE
t
PWE
t
BW
t
HA
t
SD
t
HD
1041V33-8
Write Cycle No. 2 (BLE or BHE Controlled)
ADDRESS
t
,BLE
BHE
WE
CE
DATAI/O
Notes:
14. Data I/O is high impedance if OE
15. If CE
goes HIGH simultaneousl y with WE going HIGH, the o utput remains in a hig h-imped ance stat e.