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CD74HC299 Datasheet(PDF) 2 Page - Texas Instruments

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Part No. CD74HC299
Description  High Speed CMOS Logic 8-Bit Universal Shift Register; Three-State
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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CD74HC299 Datasheet(HTML) 2 Page - Texas Instruments

 
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Functional Diagram
MODE SELECT FUNCTION TABLE THREE-STATE I/O PORT OPERATING MODE
FUNCTION
INPUTS
INPUTS/OUTPUTS
OE1
OE2
S0
S1
Qn (REGISTER)
I/O0 --- I/O7
Read Register
L
L
L
X
L
L
L
LL
XH
H
LL
X
L
L
L
LL
X
L
H
H
Load Register
X
X
H
H
Qn = I/On
I/On = Inputs
Disable I/O
H
X
X
X
X
(Z)
X
H
X
X
X
(Z)
TRUTH TABLE
FUNCTION
INPUTS
REGISTER OUTPUTS
MR
CP
S0
S1
DS0
DS7
I/On
Q0
Q1
---
Q6
Q7
RESET (CLEAR)
L
XXXXXX
L
L
---
L
L
Shift Right
H
hl
l
X
X
L
q0
---
q5
q6
H
hlh
X
X
H
q0
---
q5
Q6
Shift Left
H
l
h
XlX
q1
q2
---
q7
L
H
lh
X
h
X
q1
q2
---
q7
H
Hold (Do Nothing)
H
l
l
XXX
q0
q1
---
q6
q7
Parallel Load
H
hh
X
X
l
L
L
---
LL
H
h
h
X
X
h
H
H
---
H
H
NOTE: H = Input Voltage High Level, h = Input voltage high one set-up timer prior clock transition; L = Input Voltage Low Level; l = Input
voltage low one set-up time prior clock transition; qn = Lower case letter indicates the state of the reference output one set-up time prior to
clock transition; X - Voltage level on logic status don’t care; Z = Output in high impedance state,
↑ = Low to High Clock Transition.
I/O
THREE-STATE
OUTPUTS
I/O
THREE-STATE
OUTPUTS
SHIFT
REGISTER
MODE SELECTION
CP OE1 OE2
MR
12
2
3
9
20
VCC
7
6
5
4
8
1
I/O0
Q0
S0
STANDARD
OUTPUT
I/O2
I/O4
I/O6
BUS LINE
OUTPUTS
GND
10
11
18
DS0
DS7
13
14
15
16
17
19
I/O1
Q7
S1
STANDARD
OUTPUT
I/O3
I/O5
I/O7
BUS LINE
OUTPUTS
THREE-
STATE
CONTROL
CD74HC299, CD74HCT299


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