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MC74HC259A Datasheet PDF : 9 Pages
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MC74HC259A
8-Bit Addressable Latch
1-of-8 Decoder
High−Performance Silicon−Gate CMOS
The MC74HC259A is identical in pinout to the LS259. The device
inputs are compatible with standard CMOS outputs; with pullup
resistors, they are compatible with LSTTL outputs.
The HC259A has four modes of operation as shown in the mode
selection table. In the addressable latch mode, the data on Data In is
written into the addressed latch. The addressed latch follows the data
input with all non−addressed 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 one−of−eight
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 HC259A 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.
Features
• Output Drive Capability: 10 LSTTL Loads
• Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 2 to 6 V
• Low Input Current: 1 mA
• High Noise Immunity Characteristic of CMOS Devices
• NLV Prefix for Automotive and Other Applications Requiring
Unique Site and Control Change Requirements; AEC−Q100
Qualified and PPAP Capable
• These Devices are Pb−Free, Halogen Free and are RoHS Compliant
http://onsemi.com
16
1
MARKING
DIAGRAMS
16
SOIC−16
D SUFFIX
CASE 751B
HC259AG
AWLYWW
1
16
TSSOP−16
HC
16
DT SUFFIX
259A
CASE 948F
ALYWG
G
1
1
A
WL, L
YY, Y
WW, W
G or G
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
(Note: Microdot may be in either location)
PIN ASSIGNMENT
A0 1
A1 2
A2 3
Q0 4
Q1 5
Q2 6
Q3 7
GND 8
16 VCC
15 RESET
14 ENABLE
13 DATA IN
12 Q7
11 Q6
10 Q5
9 Q4
MODE SELECTION TABLE
Enable Reset
Mode
L
H
Addressable Latch
H
H
Memory
L
L 8−Line Demultiplexer
H
L
Reset
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 6 of this data sheet.
© Semiconductor Components Industries, LLC, 2012
1
June, 2012 − Rev. 3
Publication Order Number:
MC74HC259A/D
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