MCM62449WJ35R2 데이터 시트보기 (PDF) - Motorola => Freescale
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MCM62449WJ35R2 Datasheet PDF : 7 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 1a
READ CYCLE TIMING (See Note 1)
MCM6249–20 MCM6249–25 MCM6249–35
Parameter
Symbol Min Max Min Max Min Max Unit Notes
Read Cycle Time
tAVAV
20
—
25
—
35
—
ns
2, 3
Address Access Time
tAVQV
—
20
—
25
—
35
ns
Enable Access Time
tELQV
—
20
—
25
—
35
ns
4
Output Enable Access Time
tGLQV
—
6
—
8
—
10
ns
Output Hold from Address Change
tAXQX
5
—
5
—
5
—
ns
Enable Low to Output Active
tELQX
5
—
5
—
5
—
ns 5, 6, 7
Output Enable Low to Output Active
tGLQX
0
—
0
—
0
—
ns 5, 6, 7
Enable High to Output High–Z
tEHQZ
0
9
0
10
0
12
ns 5, 6, 7
Output Enable High to Output High–Z
tGHQZ
0
9
0
10
0
12
ns 5, 6, 7
Power Up Time
tELICCH
0
—
0
—
0
—
ns
Power Down Time
tEHICCL
—
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 con–
tention 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 with load of Figure 1b.
7. This parameter is sampled and not 100% tested.
8. Device is continuously selected (E ≤ VIL, G ≤ VIL).
OUTPUT
Z0 = 50 Ω
(a)
RL = 50 Ω
VL = 1.5 V
OUTPUT
255 Ω
+5V
480 Ω
5 pF
(b)
TIMING LIMITS
The table of timing values shows either a minimum
or a maximum limit for each parameter. Input re-
quirements are specified from the external system
point of view. Thus, address 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 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 Loads
MOTOROLA FAST SRAM
MCM6249
3
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