Rainbow Electronics W2465 User Manual
W2465
CS1
WE
OE
8K × 8 CMOS STATIC RAM
GENERAL DESCRIPTION
The W2465 is a slow-speed, low-power CMOS static RAM organized as 8192 × 8 bits that operates
on a single 5-volt power supply. This device is manufactured using Winbond's high performance
CMOS technology.
FEATURES
• Low power consumption:
− Active: 250 mW (max.)
− Standby: 100 µW (max.)(LL-version)
250 µW (max.)(L-version)
• Access time: 70/100 nS (max.)
• Single +5V power supply
• Fully static operation
• All inputs and outputs directly TTL compatible
• Three-state outputs
• Battery back-up operation capability
• Data retention voltage: 2V (min.)
• Available packages: 28-pin 600 mil DIP,
330 mil SOP and 300 mil skinny DIP
PIN CONFIGURATION
1
2
A12
3
A7
4
A6
A5
5
A4
6
A3
7
A2
8
A1
9 20
A0
10
11
I/O1
12
I/O2
I/O3
13 16
V
SS
14 15
BLOCK DIAGRAM
V
DD
V
SS
V
WE
CS
A8
A9
A11
OE
A10
CS
I/O8
I/O7
I/O6
I/O5
I/O4
DD
A0
A12
CS2
CS1
OE
WE
.
.
DECODER
CONTROL
CORE
ARRAY
DATA I/O
I/O1
I/O8
.
.
PIN DESCRIPTION
SYMBOL DESCRIPTION
A0−A12
I/O1−I/O8
, CS2
VDD Power Supply
VSS Ground
NC No Connection
Address Inputs
Data Inputs/Outputs
Chip Select Inputs
Write Enable Input
Output Enable Input
28NC
27
26
25
24
23
22
21
19
18
17
Publication Release Date: April 1997
- 1 - Revision A8
W2465
CS1
WE
CS1
CS1
CS1
≥
TRUTH TABLE
CS1 CS2 OE WE MODE
I/O1−I/O8
H X X X Not Selected High Z ISB, ISB1
X L X X Not Selected High Z ISB, ISB1
L H H H Output Disable High Z IDD
L H L H Read Data Out IDD
L H X L Write Data In IDD
DC CHARACTERISTICS
Absolute Maximum Ratings
PARAMETER RATING UNIT
Supply Voltage to VSS Potential -0.5 to +7.0 V
Input/Output to VSS Potential -0.5 to VDD +0.5 V
Allowable Power Dissipation 1.0 W
Storage Temperature -65 to +150
Operating Temperature 0 to +70
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the
device.
VDD CURRENT
°C
°C
Operating Characteristics
(VDD = 5V ±10%, VSS = 0V, TA = 0 to 70° C)
PARAMETER SYM. TEST CONDITIONS MIN. TYP. MAX. UNIT
Input Low Voltage VIL - -0.5 - +0.8 V
Input High Voltage VIH - +2.2 - VDD +0.5 V
Input Leakage Current ILI VIN = VSS to VDD -2 - +2
Output Leakage
Current
Output Low Voltage VOL IOL = +4.0 mA - - 0.4 V
Output High Voltage VOH IOH = -1.0 mA 2.4 - - V
Operating Power
Supply Current
Standby Power Supply
Current
Note: Typical characteristics are at VDD = 5 V, TA = 25° C.
ILO VI/O = VSS to VDD
= VIH (min.) or CS2
= VIL (max.) or OE = VIH
IDD
(min.) or
= VIL (max.),
= VIL (max.)
CS2 = VIH (min.)
I/O = 0 mA,
Cycle = min.
Duty = 100%
ISB
= VIH (min.) or CS2
= VIL (max.), Cycle = min.
Duty = 100%
ISB1
VDD -0.2V
or CS2 ≤ 0.2V
-2 - +2
70 - - 70 mA
100 - - 60 mA
- - 3 mA
LL - - 20
L - - 50
µA
µA
µA
µA
- 2 -
W2465
CAPACITANCE
(VDD = 5V, TA = 25° C, f = 1 MHz)
PARAMETER SYM. CONDITIONS MAX. UNIT
Input Capacitance CIN VIN = 0V 6 pF
Input/Output Capacitance CI/O VOUT = 0V 8 pF
Note: These parameters are sampled but not 100% tested.
AC CHARACTERISTICS
AC Test Conditions
PARAMETER CONDITIONS
Input Pulse Levels 0.6V to 2.4V
Input Rise and Fall Times 5 nS
Input and Output Timing Reference Level 1.5V
Output Load CL = 100 pF, IOH/IOL = -1 mA/4 mA
AC Test Loads and Waveform
R1 1000 ohm
5V
OUTPUT
100 pF
Including
Jig and
Scope
R2
660 ohm
2.4V
0.6V
5 nS
(For T
90% 90%
10%
10%
R1 1000 ohm
5V
OUTPUT
5 pF
Including
Jig and
Scope
CLZ1,
T T T T T T T
CLZ2,
5 nS
OLZ,
CHZ1,
CHZ2,
OHZ,
WHZ,
R2
660 ohm
)
OW
Publication Release Date: April 1997
- 3 - Revision A8
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