MC14557B
1−to−64 Bit Variable Length
Shift Register
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.
simply to implement odd length shift registers.
Maximum ratings are those values beyond which device damage can occur.
Maximum ratings applied to the device are individual stress limit values (not
normal operating conditions) and are not valid simultaneously. If these limits are
exceeded, device functional operation is not implied, damage may occur and
reliability may be affected.
1. V
2. Temperature Derating:
*For additional information on our Pb−Free strategy and soldering details, please
MAXIMUM RATINGS
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
V
V
I
P
T
T
T
Symbol
in
The MC14557B is a static clocked serial shift register whose length
The device can be effectively used for variable digital delay lines or
A
stg
Schottky TTL Load Over the Rated Temperature Range
L
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
Capable of Driving Two Low−power TTL Loads or one Low−power
Pb−Free Packages are Available
DD
in
D
Semiconductor Components Industries, LLC, 2004
, I
Unused inputs must always be tied to an appropriate logic voltage level (e.g.,
either V
Plastic “P and D/DW” Packages: – 7.0 mW/ C From 65 C To 125 C
, V
in
out
out
and V
SS
out
DC Supply Voltage Range
Input or Output Voltage Range
(DC or Transient)
Input or Output Current
(DC or Transient) per Pin
Power Dissipation,
per Package (Note 2)
Ambient Temperature Range
Storage Temperature Range
Lead Temperature
(8−Second Soldering)
or V
should be constrained to the range V
DD
). Unused outputs must be left open.
Parameter
(Voltages Referenced to V
−0.5 to V
−0.5 to +18.0
SS
−55 to +125
−65 to +150
SS
)
Value
v (V
500
260
10
DD
in
+ 0.5
or V
out
1
) v V
Unit
mW
mA
V
V
C
C
C
DD
.
16
See detailed ordering and shipping information in the package
dimensions section on page 6 of this data sheet.
DW SUFFIX
CASE 751G
SOEIAJ−16
SO−16 WB
CASE 648
CASE 966
1
P SUFFIX
F SUFFIX
PDIP−16
1
ORDERING INFORMATION
A
WL, L
YY, Y
WW, W = Work Week
= Assembly Location
= Wafer Lot
= Year
16
MARKING DIAGRAMS
1
Publication Order Number:
16
1
16
1
MC14557BCP
MC14557B
AWLYYWW
AWLYYWW
ALYW
14557
MC14557B/D