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MC74VHCT259A Datasheet, PDF (1/9 Pages) ON Semiconductor – 8−Bit Addressable Latch/1−of−8 Decoder CMOS Logic Level Shifter with LSTTL−Compatible Inputs | |||
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MC74VHCT259A
8âBit Addressable
Latch/1âofâ8 Decoder
CMOS Logic Level Shifter
with LSTTLâCompatible Inputs
The MC74VHCT259 is an 8âbit Addressable Latch fabricated with
silicon gate CMOS technology. It achieves high speed operation
similar to equivalent Bipolar Schottky TTL while maintaining CMOS
low power dissipation.
The internal circuit is composed of three stages, including a buffer
output which provides high noise immunity and stable output.
The VHC259 is designed for general purpose storage applications in
digital systems. The device has four modes of operation as shown in
the mode selection table. In the addressable latch mode, the signal on
Data In is written into the addressed latch. The addressed latch follows
the data input with all nonâaddressed latches remaining in their
previous states. In the memory mode, all latches remain in their
previous state and are unaffected by the Data or Address inputs. In the
oneâofâeight decoding or demultiplexing mode, the addressed output
follows the state of Data In with all other outputs in the LOW state. In
the Reset mode, all outputs are LOW and unaffected by the address
and data inputs. When operating the VHCT259 as an addressable
latch, changing more than one bit of the address could impose a
transient wrong address. Therefore, this should only be done while in
the memory mode.
The VHCT inputs are compatible with TTL levels. This device can
be used as a level converter for interfacing 3.3 V to 5.0 V because it
has full 5.0 V CMOS level output swings.
The VHCT259A input structures provide protection when voltages
between 0 V and 5.5 V are applied, regardless of the supply voltage.
The output structures also provide protection when VCC = 0 V. These
input and output structures help prevent device destruction caused by
supply voltageâinput/output voltage mismatch, battery backup, hot
insertion, etc.
Features
⢠High Speed: tPD = 7.6 ns (Typ) at VCC = 5.0 V
⢠Low Power Dissipation: ICC = 2 mA (Max) at TA = 25°C
⢠TTLâCompatible Inputs: VIL = 0.8 V; VIH = 2.0 V
⢠Power Down Protection Provided on Inputs and Outputs
⢠Pin and Function Compatible with Other Standard Logic Families
⢠Latchup Performance Exceeds 300 mA
⢠ESD Performance: HBM > 2000 V
⢠PbâFree Packages are Available*
http://onsemi.com
MARKING
DIAGRAMS
16
SOICâ16
D SUFFIX
CASE 751B
VHCT259AG
AWLYWW
1
1
16
TSSOPâ16
VHCT
DT SUFFIX
259A
CASE 948F
ALYWG
G
1
1
16
SOEIAJâ16
M SUFFIX
CASE 966
74VHCT259
ALYWG
1
1
A
= Assembly Location
WL, L = Wafer Lot
Y
= Year
WW, W = Work Week
G or G = PbâFree Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
*For additional information on our PbâFree strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2006
1
January, 2006 â Rev. 4
Publication Order Number:
MC74VHCT259A/D
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