MCM6946 データシートの表示（PDF） - Motorola => Freescale
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MCM6946 Datasheet PDF : 11 Pages
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AC OPERATING CONDITIONS AND CHARACTERISTICS
(VCC = 3.3 V – 5%, + 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 1
READ CYCLE TIMING (See Notes 1 and 2)
MCM6946–8 MCM6946–10 MCM6946–12 MCM6946–15
Parameter
Symbol Min Max Min Max Min Max Min Max Unit Notes
Read Cycle Time
tAVAV
8
—
10
—
12
—
15
—
ns
3
Address Access Time
tAVQV
—
8
—
10
—
12
—
15
ns
Enable Access Time
tELQV
—
8
—
10
—
12
—
15
ns
4
Output Enable Access Time
tGLQV
—
4
—
5
—
6
—
7
ns
Output Hold from Address Change
tAXQX
2
—
2
—
2
—
2
—
ns
Enable Low to Output Active
tELQX
3
—
3
—
3
—
3
—
ns 5, 6, 7
Output Enable Low to Output Active
tGLQX
0
—
0
—
0
—
0
—
ns 5, 6, 7
Enable High to Output High–Z
tEHQZ
0
4
0
5
0
6
0
7
ns 5, 6, 7
Output Enable High to Output High–Z
tGHQZ
0
4
0
5
0
6
0
7
ns 5, 6, 7
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
contention conditions during read and write cycles.
3. All read cycle timings are referenced from the last valid address to the first transitioning address.
t t 4. Addresses valid prior to or coincident with E going low.
5. At any given voltage and temperature, tEHQZ max tELQX min, and tGHQZ max tGLQX min, both for a given device and from device
to device.
6. Transition is measured ± 200 mV from steady–state voltage.
7. This parameter is sampled and not 100% tested.
8. Device is continuously selected (E ≤ VIL, G ≤ VIL).
OUTPUT
Z0 = 50 Ω
RL = 50 Ω
VL = 1.5 V
TIMING LIMITS
The table of timing values shows either a minimum
or a maximum limit for each parameter. Input require-
ments are specified from the external system point of
view. Thus, address setup time is shown as a mini-
mum since the system must supply at least that much
time. 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 provides data later than that time.
Figure 1. AC Test Load
MCM6946
6
MOTOROLA FAST SRAM
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