66
CY7C164
CY7C166
16K x 4 Static RAM
Features
three-state drivers. The CY7C166 has an active LOW Output
Enable (OE) feature. Both devices have an automatic powerdown feature, reducing the power consumption by 65% when
deselected.
• High speed
— 15 ns
• Output enable (OE) feature (CY7C166)
• CMOS for optimum speed/power
• Low active power
— 633 mW
• Low standby power
— 110 mW
• TTL-compatible inputs and outputs
• Automatic power-down when deselected
Writing to the device is accomplished when the Chip Enable
(CE) and Write Enable (WE) inputs are both LOW (and the
Output Enable (OE) is LOW for the CY7C166). Data on the
four input/output pins (I/O0 through I/O3) is written into the
memory location specified on the address pins (A0 through
A13).
Functional Description
Reading the device is accomplished by taking Chip Enable
(CE) LOW (and OE LOW for CY7C166), while Write Enable
(WE) remains HIGH. Under these conditions the contents of
the memory location specified on the address pins will appear
on the four data I/O pins.
The CY7C164 and CY7C166 are high-performance CMOS
static RAMs organized as 16,384 by 4 bits. Easy memory expansion is provided by an active LOW Chip Enable (CE) and
The I/O pins stay in a high-impedance state when Chip Enable
(CE) is HIGH (or Output Enable (OE) is HIGH for CY7C166).
A die coat is used to insure alpha immunity.
Logic Block Diagram
Pin Configurations
SOJ
Top View
DIP
Top View
A5
A6
A7
A8
A9
A10
A11
A12
A13
CE
GND
INPUT BUFFER
1
2
3
4
5
6 7C164
7
8
9
10
11
22
21
20
19
18
17
16
15
14
13
12
VCC
A4
A3
A2
A1
A0
I/O3
I/O2
I/O1
I/O0
WE
A5
A6
A7
A8
A9
A10
A11
A12
A13
CE
NC
GND
24
23
22
21
20
19
18
17
16
15
14
13
VCC
A4
A3
A2
A1
A0
NC
I/O3
I/O2
I/O1
I/O0
WE
C164–2
256 x 64 x 4
ARRAY
DIP/SOJ
Top View
I/O2
A5
A6
A7
A8
A9
A10
A11
A12
A13
CE
OE
GND
I/O1
I/O0
POWER
DOWN
CE
WE
(OE)
(7C166 ONLY)
A13
COLUMN
DECODER
A0
A9
A10
A11
A12
I/O3
SENSE AMPS
A1
A2
A3
A4
A5
A6
A7
A8
ROW DECODER
C164–3
1
2
3
4
5
6 7C164
7
8
9
10
11
12
VCC
A4
A3
A2
A1
A0
NC
I/O3
I/O2
I/O1
I/O0
WE
1
24
2
23
3
22
4
21
5
20
6 7C166 19
7
18
17
8
9
16
10
15
11
14
13
12
C166–1
C164–4
]
Selection Guide
7C164-15
7C166-15
7C164-20
7C166-20
7C164-25
7C166-25
7C164-35
7C166-35
Maximum Access Time (ns)
15
20
25
35
Maximum Operating Current (mA)
115
115
105
105
Maximum Standby Current (mA)
20
20
20
20
Cypress Semiconductor Corporation
Document #: 38-05025 Rev. **
•
3901 North First Street
•
San Jose
•
CA 95134 • 408-943-2600
Revised August 24, 2001
