Texas Instruments SN74BCT29843DW, SN74BCT29843DWR, SN74BCT29843NT Datasheet
DW OR NT PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
OE
1D
2D
3D
4D
5D
6D
7D
8D
9D
CLR
GND
V
CC
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
9Q
PRE
LE
SN74BCT29843
9-BIT BUS-INTERFACE D-TYPE LATCH
WITH 3-STATE OUTPUTS
SCBS022C – FEBRUARY 1989 – REVISED NOVEMBER 1993
Copyright 1993, Texas Instruments Incorporated
2–1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
• BiCMOS Process With CMOS Inputs and
TTL Outputs Substantially Reduces
Standby Current
• Input Has 50 kΩ
• Package Options Include Plastic
Small-Outline (DW) Packages and Standard
Plastic 300-mil DIPs (NT)
description
The SN74BCT29843 features 3-state outputs
designed specifically for driving highly capacitive
or relatively low-impedance loads. It is particularly
suitable for implementing wider buffer registers,
I/O ports, bidirectional bus drivers with parity , and
working registers.
The nine latches are transparent D-type latches. When the latch-enable (LE) input is high, the Q outputs are
complementary to the noninverting data (D) inputs.
A buffered output-enable (OE) input can be used to place the nine outputs in either a normal logic state (high
or low level) 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
need for interface or pull-up components.
The output enable (OE
) does not affect the internal operation of the flip-flops. Old data can be retained or new
data can be entered while the outputs are in the high-impedance state.
The SN74BCT29843 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
OUTPUT
PRE CLR OE LE D
Q
L X L X X H
H LLXX L
H HLHL L
H HLHH H
H HLLX Q
0
X X H X X Z
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.
SN74BCT29843
9-BIT BUS-INTERFACE D-TYPE LATCH
WITH 3-STATE OUTPUTS
SCBS022C – FEBRUARY 1989 – REVISED NOVEMBER 1993
2–2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic symbol
†
logic diagram (positive logic)
1Q
23
2Q
22
3Q
21
4Q
20
5Q
19
OE
1D
2
1D
3
2D
4
3D
5
4D
6
5D
S2
14
6Q
18
7Q
17
8Q
16
9Q
15
7
6D
8
7D
9
8D
10
9D
EN
1
OE
LE
1D
1Q
1
13
2
23
To Eight Other Channels
C1
13
LE
R
11
PRE
CLR
PRE
14
CLR
11
S
C1
1D
R
2
†
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
‡
Supply voltage range, V
CC
–0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, VI (see Note 1) –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the disabled or power-off state, V
O
–0.5 V to 7 V. . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high state, V
O
–0.5 V to V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, I
IK
(V
I
< 0) –30 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current into any output in the low state, I
O
96 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
‡
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. This is a stress rating only, and
functional operation of the device at these or any other conditions beyond those indicated in the “recommended operating conditions” section of
this specification is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability .
NOTE 1: The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
recommended operating conditions
MIN NOM MAX UNIT
V
CC
Supply voltage 4.5 5 5.5 V
V
IH
High-level input voltage 2 V
V
IL
Low-level input voltage 0.8 V
I
IK
Input clamp current –18 mA
I
OH
High-level output current –24 mA
I
OL
Low-level output current 48 mA
T
A
Operating free-air temperature 0 70 °C
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