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SN74BCT29844 Datasheet

9-Bit Bus-Interface D-Type Latch

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SN74BCT29844
9ĆBIT BUSĆINTERFACE DĆTYPE LATCH
WITH 3ĆSTATE OUTPUTS
SCBS077A − SEPTEMBER 1991 − REVISED NOVEMBER 1993
State-of-the-Art BiCMOS Design
Significantly Reduces ICCZ
ESD Protection Exceeds 2000 V Per
MIL-STD-883C, Method 3015; Exceeds 200 V
Using Machine Model (C = 200 pF, R = 0)
Package Options Include Plastic
Small-Outline (DW) Packages and Standard
Plastic 300-mil DIPs (NT)
description
The SN74BCT29844 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.
DW OR NT PACKAGE
(TOP VIEW)
OE
1D
2D
3D
4D
5D
6D
7D
8D
9D
CLR
GND
1
2
3
4
5
6
7
8
9
10
11
12
24 VCC
23 1Q
22 2Q
21 3Q
20 4Q
19 5Q
18 6Q
17 7Q
16 8Q
15 9Q
14 PRE
13 LE
The nine latches are transparent D-type latches. When the latch-enable (LE) input is high, the Q outputs are
complementary to the inverting 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 SN74BCT29844 is characterized for operation from 0°C to 70°C.
PRE
L
H
H
H
H
X
FUNCTION TABLE
INPUTS
CLR OE LE
D
XLXX
L LXX
HLHL
H L HH
HL LX
XHXX
OUTPUT
Q
H
L
H
L
Q0
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.
Copyright 1993, Texas Instruments Incorporated
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
1


Texas Instruments (TI) Electronic Components Datasheet

SN74BCT29844 Datasheet

9-Bit Bus-Interface D-Type Latch

No Preview Available !

SN74BCT29844
9ĆBIT BUSĆINTERFACE DĆTYPE LATCH
WITH 3ĆSTATE OUTPUTS
SCBS077A − SEPTEMBER 1991 − REVISED NOVEMBER 1993
logic symbol
logic diagram (positive logic)
OE
PRE
CLR
LE
1
14
11
13
2
1D
3
2D
4
3D
5
4D
6
5D
7
6D
8
7D
9
8D
10
9D
EN
S2
R
C1
1D 2
OE
PRE
1
14
CLR 11
23
1Q
22
2Q
21
3Q
20
4Q
19
5Q
18
6Q
17
7Q
16
8Q
15
9Q
LE 13
2
1D
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
S
C1
1D
R
To Eight Other Channels
23
1Q
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . − 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, VO . . . . . . . . . . . . . . . . . − 0.5 V to 7 V
Voltage range applied to any output in the high state, VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . − 0.5 V to VCC
Input clamp current, IIK (VI < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −30 mA
Current into any output in the low state, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
VCC
VIH
VIL
IIK
IOH
IOL
TA
Supply voltage
High-level input voltage
Low-level input voltage
Input clamp current
High-level output current
Low-level output current
Operating free-air temperature
MIN NOM MAX UNIT
4.5 5 5.5 V
2V
0.8 V
−18 mA
−24 mA
48 mA
0 70 °C
2 POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443


Part Number SN74BCT29844
Description 9-Bit Bus-Interface D-Type Latch
Maker Texas
Total Page 6 Pages
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