MCM6227AWJ20 Ver la hoja de datos (PDF) - Motorola => Freescale
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MCM6227AWJ20 Datasheet PDF : 8 Pages
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CAPACITANCE (f = 1.0 MHz, dV = 3.0 V, TA = 25°C, Periodically Sampled Rather Than 100% Tested)
Characteristic
Symbol
Typ
Input Capacitance
All Inputs Except Clocks and D, Q Cin
4
E and W
5
Input and Output Capacitance
D, Q Cin, Cout
5
Max
Unit
6
pF
8
8
pF
AC OPERATING CONDITIONS AND CHARACTERISTICS
(VCC = 5.0 V ± 10%, TA = 0 to + 70°C, Unless Otherwise Noted)
Input Pulse Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 3.0 V
Input Rise/Fall Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 ns
Input Timing Measurement Reference Level . . . . . . . . . . . . . . . 1.5 V
Output Timing Measurement Reference Level . . . . . . . . . . . . . 1.5 V
Output Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Figure 1A
READ CYCLE TIMING (See Notes 1 and 2)
6227A–20
6227A–25
6227A–35
6227A–45
Parameter
Symbol Min Max Min Max Min Max Min Max Unit Notes
Read Cycle Time
tAVAV
20
—
25
—
35
—
45
—
ns
2,3
Address Access Time
tAVQV
—
20
—
25
—
35
—
45
ns
Enable Access Time
tELQV
—
20
—
25
—
35
—
45
ns
4
Output Hold from Address Change
tAXQX
5
—
5
—
5
—
5
—
ns
Enable Low to Output Active
tELQX
5
—
5
—
5
—
5
—
ns 5, 6, 7
Enable High to Output High–Z
tEHQZ
0
9
0
10
0
12
—
18
ns 5, 6, 7
Power Up Time
tELICCH
0
—
0
—
0
—
0
—
ns
Power Down Time
tEHICCL —
20
—
25
—
35
—
45
ns
NOTES:
1. W is high for read cycle.
2. Product sensitivities to noise require proper grounding and decoupling of power supplies as well as minimization or elimination of bus con-
tention conditions during read and write cycles.
3. All timings are referenced from the last valid address to the first transitioning address.
4. Addresses valid prior to or coincident with E going low.
5. At any given voltage and temperature, tEHQZ max is less than tELQX min, both for a given device and from device to device.
6. Transition is measured ± 500 mV from steady–state voltage with load of Figure 1B.
7. This parameter is sampled and not 100% tested.
8. Device is continuously selected (E ≤ VIL).
OUTPUT
AC TEST LOADS
Z0 = 50 Ω
RL = 50 Ω
VL = 1.5 V
OUTPUT
255 Ω
+5V
480 Ω
5 pF
Figure 1A
Figure 1B
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.
MOTOROLA FAST SRAM
MCM6227A
3
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