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N74F1763N Datasheet(PDF) 8 Page - NXP Semiconductors

Part # N74F1763N
Description  Intelligent DRAM controller IDC
Download  16 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

N74F1763N Datasheet(HTML) 8 Page - NXP Semiconductors

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Philips Semiconductors
Product specification
74F1763
Intelligent DRAM controller (IDC)
1999 Jan 08
8
AC ELECTRICAL CHARACTERISTICS (Continued)
LIMITS
NO
PARAMETER
TEST
CONDITIONS
TA = 25_C
VCC = +5.0V "10%
CL = 300pF
RL = 70W
TA = 0_C TO +70_C
VCC = +5.0V "10%
CL = 300pF
RL = 70
W
UNIT
MIN
TYP
MAX
MIN
MAX
30
Propagation delay REQ(
#) to
DTACK(
")
6
8
11.5
6
12
ns
31
Propagation delay CP(
") to
DTACK(
#)
7.5
9.5
12
7.5
13
ns
32
Propagation delay REQ(
") to
DTACK (3-state)
9
12
13
9
15.5
ns
33
MA0–9 (refresh address) to
RAS(
#) skew
1/2tcp – 5
1/2tcp – 6.5
ns
34
RAS(
#) to MA0–9 (refresh
address) skew
1tcp – 2
1tcp – 2.5
ns
35
RAS(
") to RAS(#) skew
(precharge)
PRECHRG = 0
4tcp – 6
4tcp – 3.5
4tcp – 1.5
4tcp – 6.5
4tcp – 6.5
ns
36
RAS(
") to RAS(#) skew
(precharge)
PRECHRG = 1
3tcp – 6
3tcp – 3.5
3tcp – 1.5
3tcp + 1
3tcp – 6.5
ns
NOTES:
1. REQ High hold means that, if REQ is High at the rising clock edge, it is guaranteed that the REQ input was not sampled as Low.
2. A 50% duty cycle clock is recommended. If the duty cycle of the clock is not 50%, REQ should be held high for enough time such that a
falling CP clock edge samples REQ as High. This is to ensure that refresh cycles don’t get locked-up.
3. When ALE is Low, the address input latches are in the transparent mode and therefore any changes in the address inputs will be propagated
to the MA0–9 outputs. Figure 2 illustrates RA0–9 inputs propagating to the MA0–9 outputs, but later in the cycle, if ALE is still Low when the
CA0–9 inputs are multiplexed to the MA0–9 outputs the CA0–9 inputs will be in the transparent mode.
4. If PAGE is High and REQ is Low, RAS is automatically negated after approximately 4 CP clock cycles. If PAGE is Low and REQ is also Low,
RAS will be negated when PAGE goes High. RAS will always be negated when REQ goes High regardless of the state of PAGE input.
TIMING DIAGRAMS
SF01403
1
2
CP
3
4
5
RCP
6
Figure 1. Clock cycle timing


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