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PDF MC14557B Data sheet ( Hoja de datos )
| Número de pieza | MC14557B | |
| Descripción | 1-TO-64 BIT VARIABLE LENGTH SHIFT REGISTER | |
| Fabricantes | Motorola Semiconductors | |
| Logotipo |  |
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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
1-to-64 Bit Variable Length
Shift Register
The MC14557B is a static clocked serial shift register whose length may
be programmed to be any number of bits between 1 and 64. The number of
bits selected is equal to the sum of the subscripts of the enabled Length
Control inputs (L1, L2, L4, L8, L16, and L32) plus one. Serial data may be
selected from the A or B data inputs with the A/B select input. This feature is
useful for recirculation purposes. A Clock Enable (CE) input is provided to
allow gating of the clock or negative edge clocking capability.
The device can be effectively used for variable digital delay lines or simply
to implement odd length shift registers.
• 1–64 Bit Programmable Length
• Q and Q Serial Buffered Outputs
• Asynchronous Master Reset
• All Inputs Buffered
• No Limit On Clock Rise and Fall Times
• Supply Voltage Range = 3.0 Vdc to 18 Vdc
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎΕ Capable of Driving Two Low–power TTL Loads or one Low–power
Schottky TTL Load Over the Rated Temperature Range
ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎMAXIMUM RATINGS* (Voltages Referenced to VSS)
Symbol
Parameter
Value
Unit
VDD DC Supply Voltage
Vin, Vout Input or Output Voltage (DC or Transient)
Iin, Iout Input or Output Current (DC or Transient),
per Pin
– 0.5 to + 18.0
– 0.5 to VDD + 0.5
± 10
V
V
mA
PD Power Dissipation, per Package†
500 mW
Tstg Storage Temperature
– 65 to + 150
_C
TL Lead Temperature (8–Second Soldering)
260 _ C
* Maximum Ratings are those values beyond which damage to the device may occur.
†Temperature Derating:
Plastic “P and D/DW” Packages: – 7.0 mW/_ C From 65_ C To 125_ C
Ceramic “L” Packages: – 12 mW/_ C From 100_ C To 125_ C
LENGTH SELECT TRUTH TABLE
L32 L16 L8 L4 L2 L1
000000
000001
000010
000011
000100
000101
100000
100001
111100
111111
111110
111101
Register Length
1 Bit
2 Bits
3 Bits
4 Bits
5 Bits
6 Bits
33 Bits
34 Bits
61 Bits
62 Bits
63 Bits
64 Bits
NOTE: Length equals the sum of the binary length control
subscripts plus one.
REV 3
1/94
©MMOotoTrOolaR, IOncL. A199C5MOS LOGIC DATA
DataSheet4 U .com
MC14557B
L SUFFIX
CERAMIC
CASE 620
P SUFFIX
PLASTIC
CASE 648
DW SUFFIX
SOIC
CASE 751G
ORDERING INFORMATION
MC14XXXBCP
MC14XXXBCL
MC14XXXBDW
Plastic
Ceramic
SOIC
TA = – 55° to 125°C for all packages.
BLOCK DIAGRAM
3 RESET
4 CLOCK
5 CE
6B
Q 10
7A
9 A/B SELECT
2 L1
1 L2
15 L4
Q 11
14 L8
13 L16
12 L32
VDD = PIN 16
VSS = PIN 8
TRUTH TABLE
Inputs
Output
Rst A/B Clock CE
Q
00
01
00
01
1X
0B
0A
1B
1A
XX0
Q is the output of the first selected shift
register stage.
X = Don’t Care
MC14557B
1
1 page  
www.DataSheet4U.com
OUTLINE DIMENSIONS
L SUFFIX
CERAMIC DIP PACKAGE
CASE 620–10
ISSUE V
–A–
16 9
–B–
18
CL
–T–
SEATING
PLANE
F
NK
E
G
D 16 PL
0.25 (0.010) M T A S
M
J 16 PL
0.25 (0.010) M T B S
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.
4. DIMENSION F MAY NARROW TO 0.76 (0.030)
WHERE THE LEAD ENTERS THE CERAMIC
BODY.
INCHES
DIM MIN MAX
A 0.750 0.785
B 0.240 0.295
C ––– 0.200
D 0.015 0.020
E 0.050 BSC
F 0.055 0.065
G 0.100 BSC
H 0.008 0.015
K 0.125 0.170
L 0.300 BSC
M 0_ 15_
N 0.020 0.040
MILLIMETERS
MIN MAX
19.05 19.93
6.10 7.49
––– 5.08
0.39 0.50
1.27 BSC
1.40 1.65
2.54 BSC
0.21 0.38
3.18 4.31
7.62 BSC
0_ 15_
0.51 1.01
–A–
16
1
H
G
P SUFFIX
PLASTIC DIP PACKAGE
CASE 648–08
ISSUE R
9
B
8
FC
S
L
–T–
SEATING
PLANE
KJ
D 16 PL
0.25 (0.010) M T A M
M
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.
5. ROUNDED CORNERS OPTIONAL.
INCHES
MILLIMETERS
DIM MIN MAX MIN MAX
A 0.740 0.770 18.80 19.55
B 0.250 0.270 6.35 6.85
C 0.145 0.175 3.69 4.44
D 0.015 0.021 0.39 0.53
F 0.040 0.70 1.02 1.77
G 0.100 BSC
2.54 BSC
H 0.050 BSC
1.27 BSC
J 0.008 0.015 0.21 0.38
K 0.110 0.130 2.80 3.30
L 0.295 0.305 7.50 7.74
M 0_ 10_ 0 _ 10 _
S 0.020 0.040 0.51 1.01
MOTOROLA CMOS LOGIC DATA
DataSheet4 U .com
MC14557B
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