MCM6246 データシートの表示（PDF） - Motorola => Freescale
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MCM6246 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)
Parameter
Symbol
Typ
Input Capacitance
All Inputs Except Clocks and DQs
Cin
4
E, G, W
Cck
5
Input/Output Capacitance
DQ CI/O
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 1
READ CYCLE TIMING (See Note 1)
MCM6246–17 MCM6246–20 MCM6246–25 MCM6246–35
Parameter
Symbol Min Max Min Max Min Max Min Max Unit Notes
Read Cycle Time
Address Access Time
Enable Access Time
Output Enable Access Time
Output Hold from Address
Change
tAVAV
17
—
20
—
25
—
35
—
ns
2, 3
tAVQV
—
17
—
20
—
25
—
35
ns
tELQV
—
17
—
20
—
25
—
35
ns
4
tGLQV
—
6
—
6
—
8
—
10
ns
tAXQX
5
—
5
—
5
—
5
—
ns
Enable Low to Output Active
tELQX
5
—
5
—
5
—
5
—
ns 5, 6, 7
Output Enable Low to Output
tGLQX
0
—
0
—
0
—
0
—
ns 5, 6, 7
Active
Enable High to Output High–Z
tEHQZ
—
8
—
8
—
10
—
12
ns 5, 6, 7
Output Enable High to Output
tGHQZ
—
8
—
8
—
10
—
12
ns 5, 6, 7
High–Z
Power Up Time
tELICCH 0
—
0
—
0
—
0
—
ns
Power Down Time
tEHICCL —
17
—
20
—
25
—
35
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 conten-
tion 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/E going high.
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 ± 500 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 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. On the other hand, responses
from the memory are specified from the de-
vice 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
MOTOROLA FAST SRAM
MCM6246
3
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