MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Order this document
by MCM6208C/D
64K x 4 Fast Static RAM
The MCM6208C is fabricated using Motorola’s high–performance silicon–gate
CMOS technology. Static design eliminates the need for external clocks or timing
strobes, while CMOS circuitry reduces power consumption and provides for
greater reliability.
This device meets JEDEC standards for functionality and pinout, and is avail-
able in plastic dual–in–line and plastic small–outline J–leaded packages.
•
•
•
•
•
•
Single 5 V
±
10% Power Supply
Fully Static — No Clock or Timing Strobes Necessary
Fast Access Times: 12, 15, 20, 25, and 35 ns
Equal Address and Chip Enable Access Times
Low Power Operation: 135 –165 mA Maximum AC
Fully TTL Compatible — Three–State Output
MCM6208C
P PACKAGE
300 MIL PLASTIC
CASE 724A–01
J PACKAGE
300 MIL SOJ
CASE 810A–02
BLOCK DIAGRAM
A1
A2
A3
A4
A6
A12
A13
A14
ROW
DECODER
MEMORY ARRAY
256 ROWS x
64 x 4 COLUMNS
VCC
VSS
PIN ASSIGNMENT
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
VCC
A15
A14
A13
A12
A11
A10
DQ0
DQ1
DQ2
DQ3
W
DQ0
DQ1
DQ2
DQ3
A0
A5
A7
INPUT
DATA
CONTROL
COLUMN I/O
COLUMN DECODER
E
VSS
PIN NAMES
A8
A9
A10 A11 A15
A0 – A15 . . . . . . . . . . . . . Address Input
DQ0 – DQ3 . . . Data Input/Data Output
W . . . . . . . . . . . . . . . . . . . . Write Enable
E . . . . . . . . . . . . . . . . . . . . . . Chip Enable
VCC . . . . . . . . . . . Power Supply (+ 5 V)
VSS . . . . . . . . . . . . . . . . . . . . . . . Ground
NC . . . . . . . . . . . . . . . . . No Connection
E
W
REV 4
6/95
©
Motorola, Inc. 1994
MOTOROLA FAST SRAM
MCM6208C
1
TRUTH TABLE
(X = Don’t Care)
E
H
L
L
W
X
H
L
Mode
Not Selected
Read
Write
VCC Current
ISB1, ISB2
ICCA
ICCA
Output
High–Z
Dout
High–Z
Cycle
—
Read Cycle
Write Cycle
ABSOLUTE MAXIMUM RATINGS
(See Note)
Rating
Power Supply Voltage
Voltage Relative to VSS For Any Pin
Except VCC
Output Current
Power Dissipation
Temperature Under Bias
Operating Temperature
Storage Temperature — Plastic
Symbol
VCC
Vin, Vout
Iout
PD
Tbias
TA
Value
– 0.5 to + 7.0
– 0.5 to VCC + 0.5
±
20
1.0
– 10 to + 85
0 to + 70
Unit
V
V
mA
W
°C
°C
This device contains circuitry to protect the
inputs against damage due to high static volt-
ages or electric fields; however, it is advised
that normal precautions be taken to avoid
application of any voltage higher than maxi-
mum rated voltages to this high–impedance
circuit.
This CMOS memory circuit has been
designed to meet the dc and ac specifications
shown in the tables, after thermal equilibrium
has been established. The circuit is in a test
socket or mounted on a printed circuit board
and transverse air flow of at least 500 linear
feet per minute is maintained.
Tstg
– 55 to + 125
°C
NOTE: Permanent device damage may occur if ABSOLUTE MAXIMUM RATINGS are
exceeded. Functional operation should be restricted to RECOMMENDED OPER-
ATING CONDITIONS. Exposure to higher than recommended voltages for
extended periods of time could affect device reliability.
DC OPERATING CONDITIONS AND CHARACTERISTICS
(VCC = 5.0 V
±
10%, TA = 0 to 70°C, Unless Otherwise Noted)
RECOMMENDED OPERATING CONDITIONS
Parameter
Supply Voltage (Operating Voltage Range)
Input High Voltage
Input Low Voltage
Symbol
VCC
VIH
VIL
Min
4.5
2.2
– 0.5
*
Typ
5.0
—
—
Max
5.5
VCC + 0.3
**
0.8
Unit
V
V
V
* VIL (min) = – 0.5 V dc; VIL (min) = – 2.0 V ac (pulse width
≤
20 ns)
** VIH (max) = VCC + 0.3 V dc; VIH (max) = VCC + 2.0 V ac (pulse width
≤
20 ns)
DC CHARACTERISTICS
Parameter
Input Leakage Current (All Inputs, Vin = 0 to VCC)
Output Leakage Current (E1 = VIH, Vout = 0 to VCC)
Standby Current (E
≥
VCC – 0.2 V*, Vin
≤
VSS + 0.2 V, or
≥
VCC – 0.2 V,
VCC = Max, f = 0 MHz)
Output Low Voltage (IOL = 8.0 mA)
Output High Voltage (IOH = – 4.0 mA)
Symbol
Ilkg(I)
Ilkg(O)
ISB2
VOL
VOH
Min
—
—
—
—
2.4
Max
±
1
±
1
20
0.4
—
Unit
µA
µA
mA
V
V
POWER SUPPLY CURRENTS
Parameter
AC Supply Current (Iout = 0 mA, VCC = Max, f = fmax)
Standby Current (E = VIH, VCC = Max, f = fmax)
Symbol
ICCA
ISB1
– 12
165
55
– 15
155
50
– 20
145
45
– 25
135
40
– 35
135
40
Unit
mA
mA
MCM6208C
2
MOTOROLA FAST SRAM
CAPACITANCE
(f = 1 MHz, dV = 3 V, TA = 25°C, Periodically Sampled Rather Than 100% Tested)
Characteristic
Address Input Capacitance
Control Pin Input Capacitance (E, G, W)
I/O Capacitance
Symbol
Cin
Cin
CI/O
Max
6
6
8
Unit
pF
pF
pF
AC OPERATING CONDITIONS AND CHARACTERISTICS
(VCC = 5.0 V
±
10%, TA = 0 to + 70°C, Unless Otherwise Noted)
Input Timing Measurement Reference Level . . . . . . . . . . . . . . . 1.5 V
Input Pulse Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 3.0 V
Input Rise/Fall Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 ns
Output Timing Measurement Reference Level . . . . . . . . . . . . . 1.5 V
Output Load . . . . . . . . . . . . . . . . Figure 1A Unless Otherwise Noted
READ CYCLE
(See Notes 1 and 2)
– 12
Parameter
Read Cycle Time
Address Access Time
Enable Access Time
Output Enable Access Time
Output Hold from Address Change
Enable Low to Output Active1
Enable High to Output High–Z
Output Enable Low to Output Active
Output Enable High to Output High–Z
Power Up Time
Power Down Time
Symbol
tAVAV
tAVQV
tELQV
tGLQV
tAXQX
tELQX
tEHQZ
tGLQX
tGHQZ
tELICCH
tEHICCL
Min
12
—
—
—
4
4
0
0
0
0
—
Max
—
12
12
6
—
—
6
—
6
—
12
– 15
Min
15
—
—
—
4
4
0
0
0
0
—
Max
—
15
15
8
—
—
8
—
7
—
15
– 20
Min
20
—
—
—
4
4
0
0
0
0
—
Max
—
20
20
10
—
—
9
—
8
—
20
– 25
Min
25
—
—
—
4
4
0
0
0
0
—
Max
—
25
25
12
—
—
10
—
10
—
25
Min
35
—
—
—
4
4
0
0
0
0
—
–35
Max
—
25
25
—
—
—
10
—
—
—
35
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
4, 5, 6
4, 5, 6
4, 5, 6
4, 5, 6
3
Notes
2
NOTES:
1. W is high for read cycle.
2. All timings are referenced from the last valid address to the first transitioning address.
3. Addresses valid prior to or coincident with E going low.
4. At any given voltage and temperature, tEHQZ max is less than tELQX min, and tGHQZ max is less than tGLQX min, both for a given device
and from device to device.
5. Transition is measured
±
500 mV from steady–state voltage with load of Figure 1B.
6. This parameter is sampled and not 100% tested.
7. Device is continuously selected (E1
≤
VIL).
AC TEST LOADS
+5V
RL = 50
Ω
OUTPUT
Z0 = 50
Ω
VL = 1.5 V
OUTPUT
255
Ω
5 pF
480
Ω
TIMING LIMITS
The table of timing values shows either a
minimum or a maximum limit for each param-
eter. Input requirements are specified from
the external system point of view. Thus, ad-
dress setup time is shown as a minimum
since the system must supply at least that
much time (even though most devices do not
require it). On the other hand, responses from
the memory are specified from the device
point of view. Thus, the access time is shown
as a maximum since the device never pro-
vides data later than that time.
Figure 1A
Figure 1B
MOTOROLA FAST SRAM
MCM6208C
3
READ CYCLE 1
(See Note 8)
tAVAV
A (ADDRESS)
tAXQX
Q (DATA OUT)
PREVIOUS DATA VALID
tAVQV
DATA VALID
READ CYCLE 2
(See Notes 2 and 4)
tAVAV
A (ADDRESS)
tELQV
E (CHIP ENABLE)
tELQX
HIGH–Z
tEHQZ
HIGH–Z
Q (DATA OUT)
DATA VALID
tAVQV
VCC
SUPPLY CURRENT
ICC
ISB
tELICCH
tEHICCL
MCM6208C
4
MOTOROLA FAST SRAM
WRITE CYCLE 1
(W Controlled, See Notes 1, 2, and 3)
– 12
Parameter
Write Cycle Time
Address Setup Time
Address Valid to End of Write
Write Pulse Width
Write Pulse Width, E High
Data Valid to End of Write
Data Hold Time
Write Low to Output High–Z
Write High to Output Active
Write Recovery Time
Symbol
tAVAV
tAVWL
tAVWH
tWLWH,
tWLEH
tWLWH,
tWLEH
tDVWH
tWHDX
tWLQZ
tWHQX
tWHAX
Min
12
0
10
10
8
6
0
0
4
0
Max
—
—
—
—
—
—
—
7
—
—
– 15
Min
15
0
12
12
10
7
0
0
4
0
Max
—
—
—
—
—
—
—
7
—
—
– 20
Min
20
0
15
15
12
8
0
0
4
0
Max
—
—
—
—
—
—
—
8
—
—
– 25
Min
25
0
20
20
15
10
0
0
4
0
Max
—
—
—
—
—
—
—
10
—
—
– 35
Min
35
0
20
20
15
10
0
0
4
0
Max
—
—
—
—
—
—
—
10
—
—
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
3, 4, 5
3, 4, 5
Notes
2
NOTES:
1. A write occurs during the overlap of E low and W low.
2. All timings are referenced from the last valid address to the first transitioning address.
3. At any given voltage and temperature, tWLQZ max is less than tWHQX min, both for a given device and from device to device.
4. Transition is measured
±
500 mV from steady–state voltage with load of Figure 1B.
5. This parameter is sampled and not 100% tested.
WRITE CYCLE 1
(W Controlled, See Notes 1 and 2)
tAVAV
A (ADDRESS)
tAVWH
E (CHIP ENABLE)
tWLWH
tWLEH
W (WRITE ENABLE)
tAVWL
D (DATA IN)
tWLQZ
Q (DATA OUT)
HIGH–Z
HIGH–Z
tDVWH
DATA VALID
tWHQX
tWHDX
tWHAX
MOTOROLA FAST SRAM
MCM6208C
5
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