Texas Instruments CD74FCT844AEN, CD74FCT843AM96, CD74FCT843AM Datasheet
8-1
Data sheet acquired from Harris Semiconductor
SCHS267
Features
• Buffered Inputs
• Typical Propagation Delay: 6.8ns at V
CC
= 5V,
T
A
= 25oC, CL = 50pF (FCT843A)
• CD74FCT843A
- Noninverting
• CD74FCT844A
- Inverting
• SCR Latchup Resistant BiCMOS Process and
Circuit Design
• Speed of Bipolar FAST™/AS/S
• 48mA Output Sink Current
• Output Voltage Swing Limited to 3.7V at V
CC
= 5V
• Controlled Output Edge Rates
• Input/Output Isolation to V
CC
• BiCMOS Technology with Low Quiescent Power
Pinouts
Ordering Information
PART NUMBER
TEMP.
RANGE (oC) PACKAGE
PKG.
NO.
CD74FCT844AEN 0 to 70 24 Ld PDIP E24.3
CD74FCT843AM 0 to 70 24 Ld SOIC M24.3
NOTE: When ordering the suffix M package, use the entire part
number. Add the suffix 96 to obtain the variant in the tape and reel.
CD74FCT843A
(SOIC)
TOP VIEW
CD74FCT844A
(PDIP)
TOP VIEW
1
2
3
4
5
6
7
8
9
10
11
12
OE
D0
D1
D2
D3
D4
D5
D6
D7
D8
CLR
GND
16
17
18
19
20
21
22
23
24
15
14
13
VCC
Y1
Y3
Y4
Y6
Y8
PRE
LE
Y0
Y5
Y7
Y2
1
2
3
4
5
6
7
8
9
10
11
12
OE
D0
D1
D2
D3
D4
D5
D6
D7
D8
CLR
GND
16
17
18
19
20
21
22
23
24
15
14
13
VCC
Y1
Y3
Y4
Y6
Y8
PRE
LE
Y0
Y5
Y7
Y2
January 1997
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
FAST™ is a trademark of Fairchild Semiconductor.
Copyright
© Harris Corporation 1997
CD74FCT843A,
CD74FCT844A
BiCMOS FCT Interface Logic,
9-Bit Transparent Latc hes, Three-State
File Number 2396.2
NOT RECOMMENDED
FOR NEW DESIGNS
Use CMOS Technology
8-2
Functional Diagram
TRUTH TABLE (Note 1)
INPUTS OUTPUTS
FUNCTION
CLR PRE OE LE
843A
Dn
844A
Dn Yn
H H H X X X Z High Z
H H H L X X Z Latched (High Z)
HHLHLHLTransparent
H H L H H L H Transparent
H H L L X X NC Latched
H L L X X X H Preset
L H L X X X L Clear
L L L X X X H Preset
L H H L X X Z Latched (High Z)
HLHLXXZLatched (High Z)
NOTE:
1. H= HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
NC = No Change
Z = High Impedance
2
3
4
5
6
7
8
9
23
22
21
20
19
18
17
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
D0
D1
D2
D3
D4
D5
D6
D7
13
GND = PIN 12
V
CC
= PIN 24
14
LE
PRE
16
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
843A 844A
10
D8
15
Y8
Y8
111
CLR
OE
CD74FCT843A, CD74FCT844A
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