HEF4720BPN 데이터 시트보기 (PDF) - Philips Electronics
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HEF4720BPN Datasheet PDF : 16 Pages
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Philips Semiconductors
256-bit, 1-bit per word random access memories
Product specification
HEF4720B
HEF4720V
AC CHARACTERISTICS
Output capacitance
VDD
V
SYMBOL
MIN.
TYP. MAX.
5
5
pF
10 CO
15
5
pF
5
pF
A.C. CHARACTERISTICS
VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times ≤ 20 ns
VDD
V
SYMBOL MIN. TYP. MAX.
Read cycle
5
Read access time
10
15
Chip select to
5
output time
10
15
5
Address hold time
10
15
Output hold time
5
with respect to
10
address input
15
Output hold time
5
with respect to
10
chip select input
15
Output floating time
5
with respect to
10
chip select input
15
5
Read cycle time
10
15
Output transition
5
times
10
LOW to HIGH
15
5
HIGH to LOW
10
15
tACC
tCO
tOA
tVAL1
tCOH
tCOF
tRC
tTLH
tTHL
320 580 ns
130 220 ns
100 160 ns
180 ns
70 ns
50 ns
0
ns
0
ns
0
ns
60 170
ns
20 50
ns
15 40
ns
130 ns
70 ns
60 ns
0
ns
0
ns
0
ns
580
ns
220
ns
160
ns
60 120 ns
30 60 ns
20 40 ns
40 80 ns
22 40 ns
15 30 ns
TYPICAL EXTRAPOLATION
FORMULA
292 ns + (0,55 ns/pF) CL
118 ns + (0,23 ns/pF) CL
92 ns + (0,16 ns/pF) CL
142 ns + (0,55 ns/pF) CL
38 ns + (0,23 ns/pF) CL
32 ns + (0,16 ns/pF) CL
10 ns + (1,0 ns/pF) CL
9 ns + (0,42 ns/pF) CL
6 ns + (0,28 ns/pF) CL
14 ns + (0,52 ns/pF) CL
11 ns + (0,22 ns/pF) CL
7 ns + (0,16 ns/pF) CL
January 1995
4
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