HEF4557BT 查看數據表（PDF） - Philips Electronics
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HEF4557BT Datasheet PDF : 7 Pages
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Philips Semiconductors
1-to-64 bit variable length shift register
Product specification
HEF4557B
LSI
FUNCTION TABLE
MR A/B
L
L
LH
L
L
LH
HX
INPUTS
DA DB
D1
D2
D1
D2
D1
D2
D1
D2
X
X
CPO
H
H
X
OUTPUT
CP1
L
L
X
O (1)
D2
D1
D2
D1
L
Notes
1. The moment Dn appears at O depends on the
bit-length shown in the table below.
2. H = HIGH state (the more positive voltage)
3. L = LOW state (the less positive voltage)
4. X = state is immaterial
5.
= positive-going transition
6.
= negative-going transition
7. Dn = either HIGH or LOW
BIT-LENGTH SELECT FUNCTION TABLE
L32 L16
L8
L4
L2
L1
L
L
L
L
L
L
L
L
L
L
L
H
L
L
L
L
H
L
L
L
L
L
H
H
L
L
L
H
L
L
L
L
L
H
L
H
L
L
L
H
H
L
L
L
L
H
H
H
↓
↓
↓
↓
↓
↓
L
H
H
H
H
H
H
L
L
L
L
L
H
L
L
L
L
H
↓
↓
↓
↓
↓
↓
H
H
H
H
L
L
H
H
H
H
L
H
H
H
H
H
H
L
H
H
H
H
H
H
REGISTER LENGTH
1-bit
2-bits
3-bits
4-bits
5-bits
6-bits
7-bits
8-bits
↓
32-bits
33-bits
34-bits
↓
61-bits
62-bits
63-bits
64-bits
AC CHARACTERISTICS
VSS = 0 V; Tamb = 25 °C; input transition times ≤ 20 ns
Dynamic power
dissipation per
package (P)
VDD
V
TYPICAL FORMULA FOR P (µW)
5
3 500 fi + ∑ (foCL) × VDD2
where
10
15 000 fi + ∑ (foCL) × VDD2
fi = input freq. (MHz)
15
37 000 fi + ∑ (foCL) × VDD2
fo = output freq. (MHz)
CL = load capacitance (pF)
∑ (foCL) = sum of outputs
VDD = supply voltage (V)
January 1995
4
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