128K x 8 Static RAM
WCFS1008V1C
Revised April 19, 2002
S1008V1C
Features
High speed
-- t
AA
= 12ns
CMOS for optimum speed/power
Center power/ground pinout
Automatic power-down when deselected
Easy memory expansion with CE
and OE options
Functional Description
The WCFS1008V1C is a high-performance CMOS static RAM
organized as 131,072 words by 8 bits. Easy memory expan-
sion is provided by an active LOW Chip Enable (CE), an active
LOW Output Enable (OE), and three-state drivers. This device
has an automatic power-down feature that significantly reduc-
es power consumption when deselected.
Writing to the device is accomplished by taking Chip Enable
(CE) and Write Enable (WE) inputs LOW. Data on the eight I/O
pins (I/O
0
through I/O
7
) is then written into the location speci-
fied on the address pins (A
0
through A
16
).
Reading from the device is accomplished by taking Chip
Enable (CE) and Output Enable (OE) LOW while forcing Write
Enable (WE) HIGH. Under these conditions, the contents of
the memory location specified by the address pins will appear
on the I/O pins.
The eight input/output pins (I/O
0
through I/O
7
) are placed in a
high-impedance state when the device is deselected (CE
HIGH), the outputs are disabled (OE HIGH), or during a write
operation (CE LOW, and WE LOW).
The WCFS1008V1C is available in standard 400-mil-wide
package.
Selection Guide
WCFS1008V1C 12ns
Maximum Access Time (ns)
12
Maximum Operating Current (mA)
160
Maximum Standby Current (mA)
5
14
15
Logic Block Diagram
Pin Configurations
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
COLUMN
DECODER
RO
W
DECODER
SE
N
S
E A
M
P
S
INPUT BUFFER
POWER
DOWN
WE
OE
I/O0
I/O1
I/O2
I/O3
512 x 256 x 8
ARRAY
I/O7
I/O6
I/O5
I/O4
A
0
A
11
A
13
A
12
A
A
10
CE
A
A
16
A
9
1
2
3
4
5
6
7
8
9
10
11
14
19
20
24
23
22
21
25
28
27
26
Top View
SOJ
12
13
29
32
31
30
16
15
17
18
A
7
A
1
A
2
A
3
CE
I/O
0
I/O
1
V
CC
A
13
A
16
A
15
OE
I/O
7
I/O
6
A
12
A
11
A
10
A
9
I/O
2
A
0
A
4
A
5
A
6
I/O
4
V
CC
I/O
5
A
8
I/O
3
WE
V
SS
A
14
V
SS
WCFS1008V1C
2
Maximum Ratings
(Above which the useful life may be impaired. For user guide-
lines, not tested.)
Storage Temperature ................................. 65C to +150C
Ambient Temperature with
Power Applied............................................. 55C to +125C
Supply Voltage on V
CC
to Relative GND
[1]
.... 0.5V to +7.0V
DC Voltage Applied to Outputs
in High Z State
[1]
....................................0.5V to V
CC
+ 0.5V
DC Input Voltage
[1]
.................................0.5V to V
CC
+ 0.5V
Current into Outputs (LOW) ........................................ 20 mA
Static Discharge Voltage............................................ >2001V
(per MIL-STD-883, Method 3015)
Latch-Up Current ..................................................... >200 mA
Operating Range
Range
Ambient
Temperature
[2]
V
CC
Commercial
0C to +70C
3.3V
10%
Electrical Characteristics
Over the Operating Range
Test Conditions
WCFS1008V1C 12ns
Parameter
Description
Min.
Max.
Unit
V
OH
Output HIGH Voltage
V
CC
= Min.,
I
OH
= 4.0 mA
2.4
V
V
OL
Output LOW Voltage
V
CC
= Min.,
I
OL
= 8.0 mA
0.4
V
V
IH
Input HIGH Voltage
2.2
V
CC
+ 0.3
V
V
IL
Input LOW Voltage
[1]
0.3
0.8
V
I
IX
Input Load Current
GND < V
I
< V
CC
1
+1
A
I
OZ
Output Leakage
Current
GND < V
I
< V
CC
,
Output Disabled
5
+5
A
I
CC
V
CC
Operating
Supply Current
V
CC
= Max.,
I
OUT
= 0 mA,
f = f
MAX
= 1/t
RC
160
mA
I
SB1
Automatic CE
Power-Down Current
--TTL Inputs
Max. V
CC
, CE > V
IH
V
IN
> V
IH
or
V
IN
< V
IL
, f = f
MAX
20
mA
I
SB2
Automatic CE
Power-Down Current
--CMOS Inputs
Max. V
CC
,
CE > V
CC
0.3V,
V
IN
> V
CC
0.3V,
or V
IN
< 0.3V, f = 0
5
mA
Capacitance
[3]
Parameter
Description
Test Conditions
Max.
Unit
C
IN
Input Capacitance
T
A
= 25C, f = 1 MHz,
V
CC
= 5.0V
6
pF
C
OUT
Output Capacitance
8
pF
Notes:
1.
V
IL
(min.) = 2.0V for pulse durations of less than 20 ns.
2.
T
A
is the "Instant On" case temperature.
3.
Tested initially and after any design or process changes that may affect these parameters.
WCFS1008V1C
3
AC Test Loads and Waveforms
90%
10%
3.0V
GND
90%
10%
ALL INPUT PULSES
3.3V
OUTPUT
30 pF
INCLUDING
JIG AND
SCOPE
3.3V
OUTPUT
5 pF
INCLUDING
JIG AND
SCOPE
(a)
(b)
3 ns
3 ns
OUTPUT
R1 480
R1 480
R2
255
R2
255
167
Equivalent to:
VENIN EQUIVALENT
1.73V
TH
Switching Characteristics
[4]
Over the Operating Range
WCFS1008V1C 12ns
Parameter
Description
Min.
Max.
Unit
READ CYCLE
t
RC
Read Cycle Time
12
ns
t
AA
Address to Data Valid
12
ns
t
OHA
Data Hold from Address Change
3
ns
t
ACE
CE LOW to Data Valid
12
ns
t
DOE
OE LOW to Data Valid
6
ns
t
LZOE
OE LOW to Low Z
0
ns
t
HZOE
OE HIGH to High Z
[5, 6]
6
ns
t
LZCE
CE LOW to Low Z
[6]
3
ns
t
HZCE
CE HIGH to High Z
[5, 6]
6
ns
t
PU
CE LOW to Power-Up
0
ns
t
PD
CE HIGH to Power-Down
12
ns
WRITE CYCLE
[7, 8]
t
WC
Write Cycle Time
12
ns
t
SCE
CE LOW to Write End
9
ns
t
AW
Address Set-Up to Write End
8
ns
t
HA
Address Hold from Write End
0
ns
t
SA
Address Set-Up to Write Start
0
ns
t
PWE
WE Pulse Width
8
ns
t
SD
Data Set-Up to Write End
6
ns
t
HD
Data Hold from Write End
0
ns
t
LZWE
WE HIGH to Low Z
[6]
3
ns
t
HZWE
WE LOW to High Z
[5, 6]
6
ns
Notes:
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
/I
OH
and 30-pF load capacitance.
5.
t
HZOE
, t
HZCE
, and t
HZWE
are specified with a load capacitance of 5 pF as in part (b) of AC Test Loads. Transition is measured
500 mV from steady-state voltage.
6.
At any given temperature and voltage condition, t
HZCE
is less than t
LZCE
, t
HZOE
is less than t
LZOE
, and t
HZWE
is less than t
LZWE
for any given device.
7.
The internal write time of the memory is defined by the overlap of CE LOW and WE LOW. CE and WE must be LOW to initiate a write, and the transition of any of these
signals can terminate the write. The input data set-up and hold timing should be referenced to the leading edge of the signal that terminates the write.
8.
The minimum write cycle time for Write Cycle no. 3 (WE controlled, OE LOW) is the sum of t
HZWE
and t
SD
.
WCFS1008V1C
4
Data Retention Characteristics
Over the Operating Range
Parameter
Description
Conditions
Min.
Max.
Unit
V
DR
V
CC
for Data Retention
No input may exceed V
CC
+ 0.5V
V
CC
= V
DR
= 2.0V,
CE > V
CC
0.3V,
V
IN
> V
CC
0.3V or V
IN
< 0.3V
2.0
V
t
CDR
[3]
Chip Deselect to Data Retention Time
0
ns
t
R
Operation Recovery Time
200
s
Data Retention Waveform
3.0V
3.0V
t
CDR
V
DR
> 2V
DATA RETENTION MODE
t
R
CE
V
CC
Switching Waveforms
Read Cycle No. 1
[9, 10]
Read Cycle No. 2 (OE Controlled)
[10, 11]
Notes:
9.
Device is continuously selected. OE, CE = V
IL
.
10. WE is HIGH for read cycle.
11. Address valid prior to or coincident with CE transition LOW.
PREVIOUS DATA VALID
DATA VALID
t
RC
t
AA
t
OHA
ADDRESS
DATA OUT
50%
50%
DATA VALID
t
RC
t
ACE
t
DOE
t
LZOE
t
LZCE
t
PU
HIGH IMPEDANCE
t
HZOE
t
HZCE
t
PD
HIGH
OE
CE
ICC
ISB
IMPEDANCE
ADDRESS
DATA OUT
V
CC
SUPPLY
CURRENT
WCFS1008V1C
5
Write Cycle No. 1 (CE Controlled)
[12, 13]
Write Cycle No. 2 (WE Controlled, OE HIGH During Write)
[12, 13]
Notes:
12. Data I/O is high impedance if OE = V
IH
.
13. If CE goes HIGH simultaneously with WE going HIGH, the output remains in a high-impedance state.
14. During this period the I/Os are in the output state and input signals should not be applied.
Switching Waveforms
(continued)
t
WC
DATA VALID
t
AW
t
SA
t
PWE
t
HA
t
HD
t
SD
t
SCE
t
SCE
CE
ADDRESS
WE
DATA I/O
t
HD
t
SD
t
PWE
t
SA
t
HA
t
AW
t
SCE
t
WC
t
HZOE
DATA
IN
VALID
CE
ADDRESS
WE
DATA I/O
OE
NOTE
14
WCFS1008V1C
6
Write Cycle No. 3 (WE Controlled, OE LOW)
[13]
Switching Waveforms
(continued)
DATA VALID
t
HD
t
SD
t
LZWE
t
PWE
t
SA
t
HA
t
AW
t
SCE
t
WC
t
HZWE
CE
ADDRESS
WE
DATA I/O
NOTE
14
Truth Table
CE
OE
WE
I/O
0
I/O
7
Mode
Power
H
X
X
High Z
Power-Down
Standby (I
SB
)
X
X
X
High Z
Power-Down
Standby (I
SB
)
L
L
H
Data Out
Read
Active (I
CC
)
L
X
L
Data In
Write
Active (I
CC
)
L
H
H
High Z
Selected, Outputs Disabled
Active (I
CC
)
Ordering Information
Speed
(ns)
Ordering Code
Package
Name
Package Type
Operating
Range
12
WCFS1008V1C-JC12
J
32-Lead 300-Mil Molded SOJ
Commercial
WCFS1008V1C
7
Package Diagram
51-85041-A
32-Lead (400-Mil) Molded SOJ J
WCFS1008V1C
8
Document Title: WCFS1008V1C 128K x 8 Static RAM
REV.
Issue Date
Orig. of Change
Description of Change
**
4/15/02
XFL
New Datasheet
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