HEF4557B 查看數據表（PDF） - Philips Electronics
零件编号
产品描述 (功能)
生产厂家
HEF4557B Datasheet PDF : 7 Pages
| |||
Philips Semiconductors
1-to-64 bit variable length shift register
Product specification
HEF4557B
LSI
AC CHARACTERISTICS
VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times ≤ 20 ns
VDD
V
SYMBOL TYP. MAX.
Propagation delays
CP0, CP1 → O, O
HIGH to LOW
LOW to HIGH
MR → O
HIGH to LOW
MR → O
LOW to HIGH
Output transition times
HIGH to LOW
LOW to HIGH
5
10
tPHL
15
5
10
tPLH
15
5
10
tPHL
15
5
10
tPLH
15
5
10
tTHL
15
5
10
tTLH
15
240 480 ns
90 180 ns
65 130 ns
240 480 ns
90 180 ns
65 130 ns
170 340 ns
80 160 ns
60 120 ns
140 280 ns
70 140 ns
55 110 ns
60 120 ns
30 60 ns
20 40 ns
60 120 ns
30 60 ns
20 40 ns
TYPICAL EXTRAPOLATION
FORMULA
213 ns + (0,55 ns/pF) CL
79 ns + (0,23 ns/pF) CL
57 ns + (0,16 ns/pF) CL
213 ns + (0,55 ns/pF) CL
79 ns + (0,23 ns/pF) CL
57 ns + (0,16 ns/pF) CL
143 ns + (0,55 ns/pF) CL
69 ns + (0,23 ns/pF) CL
52 ns + (0,16 ns/pF) CL
113 ns + (0,55 ns/pF) CL
59 ns + (0,23 ns/pF) CL
47 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
10 ns + (1,0 ns/pF) CL
9 ns + (0,42 ns/pF) CL
6 ns + (0,28 ns/pF) CL
Interpolation table (see note next page)
LENGTH CONTROL INPUTS
L1
L2
L4
L8
L16
L32
L
L
L
L
L
L
H
L
L
L
L
L
X
H
L
L
L
L
X
X
H
L
L
L
X
X
X
H
L
L
X
X
X
X
H
L
X
X
X
X
X
H
Notes
1. H = HIGH state (the more positive voltage)
2. L = LOW state (the less positive voltage)
3. X = state is immaterial
MINIMUM
NUMBER OF
BITS SELECTED
1
2
3
5
9
17
33
SET-UP, HOLD,
RECOVERY
TIMES
specified
six equal steps
specified
January 1995
5
Share Link: 