SN74ALS29843 Datasheet, PDF (1/9 Pages) Texas Instruments – 9-BIT BUS INTERFACE D-TYPE LATCHES WITH 3-STATE OUTPUTS

SN54ALS29843, SN74ALS29843, SN74ALS29844
9BIT BUS INTERFACE DTYPE LATCHES WITH 3STATE OUTPUTS
SDAS151A − D2910 — JUNE 1988 — REVISED JANUARY 1990
• 3-State Buffer-Type Outputs Drive Bus
Lines Directly
SN54ALS29843 . . . JT Package
SN74ALS29843 . . . DW or NT Package
• Bus-Structured Pinout
(Top View)
• Provide Extra Bus Driving Latches
Necessary For Wider Address/Data Paths
or Buses With Parity
• Buffered Control Inputs to Reduce DC
Loading
• Power-Up High-Impedance
OC ₁
1D ₂
2D ₃
3D ₄
4D ₅
5D ₆
24 ^V_CC
23 ^1Q
22 ^2Q
21 ^3Q
20 ^4Q
19 ^5Q
• Package Options Include Plastic “Small
Outline” Packages and Standard Plastic
and Ceramic 300-Mil DIPs
6D 7
7D 8
8D 9
9D 10
18 6Q
17 7Q
16 8Q
15 9Q
description
CLR 11
GND 12
14 PRE
13 C
These 9-bit latches feature three-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 _{SN74ALS29844 . . . DW or NT Package}
working registers.
(Top View)
The nine latches are transparent D-type. The
′ALS29843 has noninverting data (D) inputs. The
′ALS29844 has inverting D inputs.
A buffered output control (OC) input can be used
to place the nine outputs in either a normal logic
state (high or low levels) or a high-impedance
state. The outputs are also in the high-impedance
state during power-up and power-down
conditions. The outputs remain in the
high-impedance state while the device is
powered-down. 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 the
bus lines in a bus-organized system without need
for interface or pullup components.
OC ₁
1D ₂
2D ₃
3D ₄
4D ₅
5D 6
6D 7
7D 8
8D 9
9D 10
CLR 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 PRE
13 C
The output control (OC) does not affect the internal operation of the latches. Old data can be retained or new
data can be entered while the outputs are off.
The SN54ALS29843 is characterized for operation over the full military range of − 55°C to 125°C. The
SN74ALS29843 and SN74ALS29844 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.
Copyright  1990, Texas Instruments Incorporated
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
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