SN74ALS841 Datasheet, PDF (1/9 Pages) Texas Instruments – 10-BIT BUS-INTERFACE D-TYPE LATCHES WITH 3-STATE OUTPUTS

• 3-State Buffer-Type Outputs Drive Bus
Lines Directly
• Bus-Structured Pinout
• Provide Extra Bus-Driving Latches
Necessary for Wider Address/Data Paths or
Buses With Parity
• Buffered Control Inputs to Reduce
dc Loading Effects
• Power-Up High-Impedance State
• Package Options Include Plastic
Small-Outline (DW) Packages and Standard
Plastic (NT) 300-mil DIPs
description
SN74ALS841, SN74AS841A, SN74ALS842
10-BIT BUS-INTERFACE D-TYPE LATCHES
WITH 3-STATE OUTPUTS
SDAS059C – DECEMBER 1983 – REVISED JANUARY 1995
SN74ALS841, SN74AS841A . . . DW OR NT PACKAGE
(TOP VIEW)
OE 1
1D 2
2D 3
3D 4
4D 5
5D 6
6D 7
7D 8
8D 9
9D 10
10D 11
GND 12
24 V_CC
23 1Q
22 2Q
21 3Q
20 4Q
19 5Q
18 6Q
17 7Q
16 8Q
15 9Q
14 10Q
13 LE
These 10-bit latches feature 3-state outputs
designed specifically for driving highly capacitive
or relatively low-impedance loads. They are
particularly suitable for implementing buffer
registers, I/O ports, bidirectional bus drivers, and
working registers.
The ten latches are transparent D-type latches.
The SN74ALS841 and SN74AS841A have
noninverting data (D) inputs. The SN74ALS842
has inverting D inputs.
A buffered output-enable (OE) input places the ten
outputs in either a normal logic state (high or low
logic levels) or a high-impedance state. In the
high-impedance state, the outputs neither load
nor drive the bus lines significantly. The
high-impedance state and increased drive provide
the capability to drive bus lines without interface or
pullup components.
SN74ALS842 . . . DW OR NT PACKAGE
(TOP VIEW)
OE 1
1D 2
2D 3
3D 4
4D 5
5D 6
6D 7
7D 8
8D 9
9D 10
10D 11
GND 12
24 V_CC
23 1Q
22 2Q
21 3Q
20 4Q
19 5Q
18 6Q
17 7Q
16 8Q
15 9Q
14 10Q
13 LE
OE does not affect the internal operation of the latches. Previously stored data can be retained or new data can
be entered while the outputs are off.
The SN74ALS841, SN74AS841A, and SN74ALS842 are characterized for operation from 0°C to 70°C.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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Copyright © 1995, Texas Instruments Incorporated
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